By the way, I find error log in snapd logs, which leads to snapd exit. The snap environment is here:
snap 2.50.1
snapd 2.50.1
series 16
ubuntu 20.04
kernel 5.8.0-53-generic
error logs:
-- Reboot --
6ζ 05 09:08:40 xxx systemd[1]: Starting Snap Daemon...
6ζ 05 09:08:41 xxx snapd[695]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:08:42 xxx snapd[695]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:08:42 xxx snapd[695]: daemon.go:347: started snapd/2.50.1 (series 16; classic) ubuntu/20.04 (amd64) linux/5.8.0-53-generic.
6ζ 05 09:08:42 xxx snapd[695]: daemon.go:440: adjusting startup timeout by 1m10s (pessimistic estimate of 30s plus 5s per snap)
6ζ 05 09:08:42 xxx systemd[1]: Started Snap Daemon.
6ζ 05 09:09:21 xxx snapd[695]: storehelpers.go:551: cannot refresh: snap has no updates available: "core18", "gnome-3-34-1804", "gtk-common-themes", "snap-store", "snapcraft", "snapd"
6ζ 05 09:09:24 xxx snapd[695]: storehelpers.go:551: cannot refresh: snap has no updates available: "core18", "gnome-3-34-1804", "gtk-common-themes", "snap-store", "snapcraft", "snapd"
6ζ 05 09:10:08 xxx snapd[695]: storehelpers.go:551: cannot refresh: snap has no updates available: "core18", "gnome-3-34-1804", "gtk-common-themes", "snap-store", "snapcraft", "snapd"
6ζ 05 09:24:08 xxx systemd[1]: snapd.service: Got notification message from PID 3990, but reception only permitted for main PID 695
6ζ 05 09:24:16 xxx snapd[695]: fatal error: sync: unlock of unlocked mutex
6ζ 05 09:24:16 xxx snapd[695]: goroutine 84 [running]:
6ζ 05 09:24:16 xxx snapd[695]: runtime.throw(0x55faf19fed79, 0x1e)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/panic.go:616 +0x83 fp=0xc42068f9f0 sp=0xc42068f9d0 pc=0x55faf11713a3
6ζ 05 09:24:16 xxx snapd[695]: sync.throw(0x55faf19fed79, 0x1e)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/panic.go:605 +0x37 fp=0xc42068fa10 sp=0xc42068f9f0 pc=0x55faf1171317
6ζ 05 09:24:16 xxx snapd[695]: sync.(*Mutex).Unlock(0xc42039f3b0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/sync/mutex.go:184 +0xc4 fp=0xc42068fa38 sp=0xc42068fa10 pc=0x55faf11b6264
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*State).unlock(0xc42039f3b0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:162 +0x37 fp=0xc42068fa50 sp=0xc42068fa38 pc=0x55faf173e0a7
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*State).Unlock(0xc42039f3b0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:239 +0x297 fp=0xc42068fb08 sp=0xc42068fa50 pc=0x55faf173e8a7
6ζ 05 09:24:16 xxx snapd[695]: runtime.call32(0x0, 0x55faf20ba838, 0xc42007c070, 0x800000008)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:573 +0x3d fp=0xc42068fb38 sp=0xc42068fb08 pc=0x55faf119e77d
6ζ 05 09:24:16 xxx snapd[695]: panic(0x55faf1f433a0, 0x55faf20bcf00)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/panic.go:502 +0x22d fp=0xc42068fbd8 sp=0xc42068fb38 pc=0x55faf1170d6d
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*State).reading(0xc42039f3b0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:149 +0x52 fp=0xc42068fbf8 sp=0xc42068fbd8 pc=0x55faf173e002
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*State).Get(0xc42039f3b0, 0x55faf19dfe8c, 0x7, 0x55faf1f06e40, 0xc4205d6be0, 0x20, 0x55faf1f2af00)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:332 +0x2d fp=0xc42068fc40 sp=0xc42068fbf8 pc=0x55faf173ed8d
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*State).GetMaybeTimings(0xc42039f3b0, 0x55faf1f06e40, 0xc4205d6be0, 0x6, 0xc420040a88)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:518 +0x5a fp=0xc42068fc98 sp=0xc42068fc40 pc=0x55faf174037a
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/timings.(*Timings).Save(0xc42066a180, 0x55faf20c7240, 0xc42039f3b0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/timings/state.go:135 +0x76 fp=0xc42068fd50 sp=0xc42068fc98 pc=0x55faf16727f6
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/snapstate.(*SnapManager).undoStopSnapServices(0xc4203cb090, 0xc420410360, 0xc4202e6e60, 0x55faf20c2880, 0xc42007d000)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/snapstate/handlers.go:2031 +0x464 fp=0xc42068fe30 sp=0xc42068fd50 pc=0x55faf17ee924
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/snapstate.(*SnapManager).(github.com/snapcore/snapd/overlord/snapstate.undoStopSnapServices)-fm(0xc420410360, 0xc4202e6e60, 0x55faf2547380, 0xc42042a6f8)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/snapstate/snapmgr.go:445 +0x40 fp=0xc42068fe68 sp=0xc42068fe30 pc=0x55faf1820040
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/state.(*TaskRunner).run.func1(0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/taskrunner.go:203 +0xbe fp=0xc42068ff98 sp=0xc42068fe68 pc=0x55faf1747a2e
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc4202e6e60, 0xc4205e1c80)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d fp=0xc42068ffd0 sp=0xc42068ff98 pc=0x55faf142456d
6ζ 05 09:24:16 xxx snapd[695]: runtime.goexit()
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:2361 +0x1 fp=0xc42068ffd8 sp=0xc42068ffd0 pc=0x55faf11a0f81
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:24:16 xxx snapd[695]: goroutine 1 [select, 15 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: main.run(0xc4203e0840, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:153 +0x501
6ζ 05 09:24:16 xxx snapd[695]: main.main()
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:64 +0x10d
6ζ 05 09:24:16 xxx snapd[695]: goroutine 5 [syscall, 15 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: os/signal.signal_recv(0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/sigqueue.go:139 +0xa8
6ζ 05 09:24:16 xxx snapd[695]: os/signal.loop()
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/os/signal/signal_unix.go:22 +0x24
6ζ 05 09:24:16 xxx snapd[695]: created by os/signal.init.0
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/os/signal/signal_unix.go:28 +0x43
6ζ 05 09:24:16 xxx snapd[695]: goroutine 19 [select, 15 minutes, locked to thread]:
6ζ 05 09:24:16 xxx snapd[695]: runtime.gopark(0x55faf20bba48, 0x0, 0x55faf19de419, 0x6, 0x18, 0x1)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/proc.go:291 +0x120
6ζ 05 09:24:16 xxx snapd[695]: runtime.selectgo(0xc42004a750, 0xc4203da240)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/select.go:392 +0xe56
6ζ 05 09:24:16 xxx snapd[695]: runtime.ensureSigM.func1()
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/signal_unix.go:549 +0x1f6
6ζ 05 09:24:16 xxx snapd[695]: runtime.goexit()
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:2361 +0x1
6ζ 05 09:24:16 xxx snapd[695]: goroutine 14 [select, 6 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/standby.(*StandbyOpinions).Start.func1(0xc4200a7400)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/standby/standby.go:104 +0x142
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/overlord/standby.(*StandbyOpinions).Start
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/standby/standby.go:97 +0xb6
6ζ 05 09:24:16 xxx snapd[695]: goroutine 16 [select]:
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord.(*Overlord).Loop.func1(0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/overlord.go:445 +0x196
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc42029eaa0, 0xc4205d6140)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:24:16 xxx snapd[695]: goroutine 50 [IO wait, 9 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.runtime_pollWait(0x7f6738dc3e30, 0x72, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/netpoll.go:173 +0x59
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*pollDesc).wait(0xc4203d8798, 0x72, 0xc4203c8000, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:85 +0x9d
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*pollDesc).waitRead(0xc4203d8798, 0xffffffffffffff00, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:90 +0x3f
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*FD).Accept(0xc4203d8780, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_unix.go:372 +0x1aa
6ζ 05 09:24:16 xxx snapd[695]: net.(*netFD).accept(0xc4203d8780, 0xc4205fddd0, 0xc4202581b0, 0x55faf20bbb78)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/fd_unix.go:238 +0x44
6ζ 05 09:24:16 xxx snapd[695]: net.(*UnixListener).accept(0xc4203401b0, 0x55faf19c85d0, 0xc420321550, 0xc4203a1170)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/unixsock_posix.go:162 +0x34
6ζ 05 09:24:16 xxx snapd[695]: net.(*UnixListener).Accept(0xc4203401b0, 0xc420260080, 0xc4205fde50, 0x55faf19d358a, 0xc420321550)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/unixsock.go:253 +0x4b
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/daemon.(*ucrednetListener).Accept(0xc420340210, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/ucrednet.go:110 +0x4f
6ζ 05 09:24:16 xxx snapd[695]: net/http.(*Server).Serve(0xc4204ea8f0, 0x55faf20cbbc0, 0xc420340210, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/http/server.go:2773 +0x1a7
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/daemon.(*Daemon).Start.func1(0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/daemon.go:478 +0x58
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420152e50, 0xc420321590)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:24:16 xxx snapd[695]: goroutine 51 [select]:
6ζ 05 09:24:16 xxx snapd[695]: main.runWatchdog.func1(0xc4200a74f0, 0xc420152e00)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:93 +0xff
6ζ 05 09:24:16 xxx snapd[695]: created by main.runWatchdog
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:91 +0x22d
6ζ 05 09:24:16 xxx snapd[695]: goroutine 21 [IO wait, 11 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.runtime_pollWait(0x7f6738dc3f00, 0x72, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/runtime/netpoll.go:173 +0x59
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*pollDesc).wait(0xc4203d8898, 0x72, 0xc4206b2100, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:85 +0x9d
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*pollDesc).waitRead(0xc4203d8898, 0xffffffffffffff00, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:90 +0x3f
6ζ 05 09:24:16 xxx snapd[695]: internal/poll.(*FD).Accept(0xc4203d8880, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/internal/poll/fd_unix.go:372 +0x1aa
6ζ 05 09:24:16 xxx snapd[695]: net.(*netFD).accept(0xc4203d8880, 0xc4205f9dd0, 0xc4202581b0, 0x55faf20bbb78)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/fd_unix.go:238 +0x44
6ζ 05 09:24:16 xxx snapd[695]: net.(*UnixListener).accept(0xc4203401e0, 0x55faf19c85d0, 0xc420321550, 0xc4203a1170)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/unixsock_posix.go:162 +0x34
6ζ 05 09:24:16 xxx snapd[695]: net.(*UnixListener).Accept(0xc4203401e0, 0xc420214060, 0xc4205f9e50, 0x55faf19d358a, 0xc420321550)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/unixsock.go:253 +0x4b
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/daemon.(*ucrednetListener).Accept(0xc420340240, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/ucrednet.go:110 +0x4f
6ζ 05 09:24:16 xxx snapd[695]: net/http.(*Server).Serve(0xc4204ea8f0, 0x55faf20cbbc0, 0xc420340240, 0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/net/http/server.go:2773 +0x1a7
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/daemon.(*Daemon).Start.func1.1(0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/daemon.go:470 +0x4b
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420152e50, 0xc420348000)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:24:16 xxx snapd[695]: goroutine 64 [syscall]:
6ζ 05 09:24:16 xxx snapd[695]: syscall.Syscall6(0x17, 0x5, 0xc42005fe38, 0x0, 0x0, 0x0, 0x0, 0xc42042fb00, 0xc42005fdc0, 0x55faf117a0db)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/syscall/asm_linux_amd64.s:44 +0x5
6ζ 05 09:24:16 xxx snapd[695]: syscall.Select(0x5, 0xc42005fe38, 0x0, 0x0, 0x0, 0x0, 0xc42005fe60, 0x55faf11707b6)
6ζ 05 09:24:16 xxx snapd[695]: /usr/lib/go-1.10/src/syscall/zsyscall_linux_amd64.go:1367 +0xb0
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/osutil/udev/netlink.stopperSelectReadable(0x3, 0x4, 0xc420706840, 0x3d, 0xc420381380)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/rawsockstop.go:57 +0x160
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/osutil/udev/netlink.RawSockStopper.func1(0xc4204dc1e0, 0xc4206cca70, 0x6)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/rawsockstop.go:31 +0x43
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/osutil/udev/netlink.(*UEventConn).Monitor.func4(0xc4204dc220, 0xc420096360, 0xc4200963c0, 0xc420096420, 0xc42034ff80, 0x55faf20ce840, 0xc4204dc1e0, 0xc420096300)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/conn.go:139 +0x3e
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/osutil/udev/netlink.(*UEventConn).Monitor
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/conn.go:136 +0x233
6ζ 05 09:24:16 xxx snapd[695]: goroutine 83 [select, 15 minutes]:
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/overlord/ifacestate/udevmonitor.(*Monitor).Run.func1(0x0, 0x0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/ifacestate/udevmonitor/udevmon.go:147 +0x35a
6ζ 05 09:24:16 xxx snapd[695]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420258090, 0xc420503dc0)
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:24:16 xxx snapd[695]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:24:16 xxx snapd[695]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:24:16 xxx systemd[1]: snapd.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
6ζ 05 09:24:16 xxx systemd[1]: snapd.service: Failed with result 'exit-code'.
6ζ 05 09:24:16 xxx systemd[1]: snapd.service: Scheduled restart job, restart counter is at 1.
6ζ 05 09:24:16 xxx systemd[1]: Stopped Snap Daemon.
6ζ 05 09:24:16 xxx systemd[1]: Starting Snap Daemon...
6ζ 05 09:24:16 xxx snapd[12416]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:24:17 xxx snapd[12416]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:24:17 xxx snapd[12416]: daemon.go:347: started snapd/2.50.1 (series 16; classic) ubuntu/20.04 (amd64) linux/5.8.0-53-generic.
6ζ 05 09:24:17 xxx snapd[12416]: daemon.go:440: adjusting startup timeout by 1m10s (pessimistic estimate of 30s plus 5s per snap)
6ζ 05 09:24:17 xxx systemd[1]: Started Snap Daemon.
6ζ 05 09:39:31 xxx systemd[1]: snapd.service: Got notification message from PID 13096, but reception only permitted for main PID 12416
6ζ 05 09:39:39 xxx snapd[12416]: fatal error: sync: unlock of unlocked mutex
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 53 [running]:
6ζ 05 09:39:39 xxx snapd[12416]: runtime.throw(0x5572b31e7d79, 0x1e)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/panic.go:616 +0x83 fp=0xc4206fb9f0 sp=0xc4206fb9d0 pc=0x5572b295a3a3
6ζ 05 09:39:39 xxx snapd[12416]: sync.throw(0x5572b31e7d79, 0x1e)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/panic.go:605 +0x37 fp=0xc4206fba10 sp=0xc4206fb9f0 pc=0x5572b295a317
6ζ 05 09:39:39 xxx snapd[12416]: sync.(*Mutex).Unlock(0xc4203b33b0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/sync/mutex.go:184 +0xc4 fp=0xc4206fba38 sp=0xc4206fba10 pc=0x5572b299f264
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*State).unlock(0xc4203b33b0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:162 +0x37 fp=0xc4206fba50 sp=0xc4206fba38 pc=0x5572b2f270a7
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*State).Unlock(0xc4203b33b0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:239 +0x297 fp=0xc4206fbb08 sp=0xc4206fba50 pc=0x5572b2f278a7
6ζ 05 09:39:39 xxx snapd[12416]: runtime.call32(0x0, 0x5572b38a3838, 0xc4200b3eb0, 0x800000008)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:573 +0x3d fp=0xc4206fbb38 sp=0xc4206fbb08 pc=0x5572b298777d
6ζ 05 09:39:39 xxx snapd[12416]: panic(0x5572b372c3a0, 0x5572b38a5f00)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/panic.go:502 +0x22d fp=0xc4206fbbd8 sp=0xc4206fbb38 pc=0x5572b2959d6d
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*State).reading(0xc4203b33b0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:149 +0x52 fp=0xc4206fbbf8 sp=0xc4206fbbd8 pc=0x5572b2f27002
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*State).Get(0xc4203b33b0, 0x5572b31c8e8c, 0x7, 0x5572b36efe40, 0xc4202a3e20, 0x20, 0x5572b3713f00)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:332 +0x2d fp=0xc4206fbc40 sp=0xc4206fbbf8 pc=0x5572b2f27d8d
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*State).GetMaybeTimings(0xc4203b33b0, 0x5572b36efe40, 0xc4202a3e20, 0x6, 0xc420042f88)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/state.go:518 +0x5a fp=0xc4206fbc98 sp=0xc4206fbc40 pc=0x5572b2f2937a
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/timings.(*Timings).Save(0xc4203efb40, 0x5572b38b0240, 0xc4203b33b0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/timings/state.go:135 +0x76 fp=0xc4206fbd50 sp=0xc4206fbc98 pc=0x5572b2e5b7f6
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/snapstate.(*SnapManager).undoStopSnapServices(0xc4200b0d70, 0xc420502240, 0xc4200b0780, 0x5572b38ab880, 0xc42007c7c0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/snapstate/handlers.go:2031 +0x464 fp=0xc4206fbe30 sp=0xc4206fbd50 pc=0x5572b2fd7924
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/snapstate.(*SnapManager).(github.com/snapcore/snapd/overlord/snapstate.undoStopSnapServices)-fm(0xc420502240, 0xc4200b0780, 0x5572b3d30380, 0x3)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/snapstate/snapmgr.go:445 +0x40 fp=0xc4206fbe68 sp=0xc4206fbe30 pc=0x5572b3009040
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/state.(*TaskRunner).run.func1(0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/state/taskrunner.go:203 +0xbe fp=0xc4206fbf98 sp=0xc4206fbe68 pc=0x5572b2f30a2e
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc4200b0780, 0xc420372570)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d fp=0xc4206fbfd0 sp=0xc4206fbf98 pc=0x5572b2c0d56d
6ζ 05 09:39:39 xxx snapd[12416]: runtime.goexit()
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:2361 +0x1 fp=0xc4206fbfd8 sp=0xc4206fbfd0 pc=0x5572b2989f81
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 1 [select, 15 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: main.run(0xc4203e28a0, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:153 +0x501
6ζ 05 09:39:39 xxx snapd[12416]: main.main()
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:64 +0x10d
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 19 [syscall, 15 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: os/signal.signal_recv(0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/sigqueue.go:139 +0xa8
6ζ 05 09:39:39 xxx snapd[12416]: os/signal.loop()
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/os/signal/signal_unix.go:22 +0x24
6ζ 05 09:39:39 xxx snapd[12416]: created by os/signal.init.0
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/os/signal/signal_unix.go:28 +0x43
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 35 [select, 15 minutes, locked to thread]:
6ζ 05 09:39:39 xxx snapd[12416]: runtime.gopark(0x5572b38a4a48, 0x0, 0x5572b31c7419, 0x6, 0x18, 0x1)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/proc.go:291 +0x120
6ζ 05 09:39:39 xxx snapd[12416]: runtime.selectgo(0xc420442f50, 0xc4203f8240)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/select.go:392 +0xe56
6ζ 05 09:39:39 xxx snapd[12416]: runtime.ensureSigM.func1()
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/signal_unix.go:549 +0x1f6
6ζ 05 09:39:39 xxx snapd[12416]: runtime.goexit()
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/asm_amd64.s:2361 +0x1
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 44 [select]:
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord.(*Overlord).Loop.func1(0x5572b2c6258b, 0xc420476ba0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/overlord.go:445 +0x196
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc4202b2aa0, 0xc4202642e0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 42 [select, 5 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/standby.(*StandbyOpinions).Start.func1(0xc4203ecd70)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/standby/standby.go:104 +0x142
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/overlord/standby.(*StandbyOpinions).Start
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/standby/standby.go:97 +0xb6
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 45 [IO wait, 8 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.runtime_pollWait(0x7ff238560f28, 0x72, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/netpoll.go:173 +0x59
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*pollDesc).wait(0xc4203f6518, 0x72, 0xc42039ba00, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:85 +0x9d
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*pollDesc).waitRead(0xc4203f6518, 0xffffffffffffff00, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:90 +0x3f
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*FD).Accept(0xc4203f6500, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_unix.go:372 +0x1aa
6ζ 05 09:39:39 xxx snapd[12416]: net.(*netFD).accept(0xc4203f6500, 0xc42059ddd0, 0xc4203b3440, 0x5572b38a4b78)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/fd_unix.go:238 +0x44
6ζ 05 09:39:39 xxx snapd[12416]: net.(*UnixListener).accept(0xc4200a5ef0, 0x5572b31b15d0, 0xc420371630, 0xc420382a20)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/unixsock_posix.go:162 +0x34
6ζ 05 09:39:39 xxx snapd[12416]: net.(*UnixListener).Accept(0xc4200a5ef0, 0xc42037ce20, 0xc42059de50, 0x5572b31bc58a, 0xc420371630)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/unixsock.go:253 +0x4b
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/daemon.(*ucrednetListener).Accept(0xc4201b2090, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/ucrednet.go:110 +0x4f
6ζ 05 09:39:39 xxx snapd[12416]: net/http.(*Server).Serve(0xc42029ec30, 0x5572b38b4bc0, 0xc4201b2090, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/http/server.go:2773 +0x1a7
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/daemon.(*Daemon).Start.func1(0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/daemon.go:478 +0x58
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420166e50, 0xc420371670)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 46 [select]:
6ζ 05 09:39:39 xxx snapd[12416]: main.runWatchdog.func1(0xc4203ece60, 0xc420166e00)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:93 +0xff
6ζ 05 09:39:39 xxx snapd[12416]: created by main.runWatchdog
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/cmd/snapd/main.go:91 +0x22d
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 47 [IO wait, 15 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.runtime_pollWait(0x7ff238560ff8, 0x72, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/runtime/netpoll.go:173 +0x59
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*pollDesc).wait(0xc4203f6618, 0x72, 0xc42039ba00, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:85 +0x9d
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*pollDesc).waitRead(0xc4203f6618, 0xffffffffffffff00, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_poll_runtime.go:90 +0x3f
6ζ 05 09:39:39 xxx snapd[12416]: internal/poll.(*FD).Accept(0xc4203f6600, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/internal/poll/fd_unix.go:372 +0x1aa
6ζ 05 09:39:39 xxx snapd[12416]: net.(*netFD).accept(0xc4203f6600, 0x30, 0x5572b381fc80, 0xc42039baa0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/fd_unix.go:238 +0x44
6ζ 05 09:39:39 xxx snapd[12416]: net.(*UnixListener).accept(0xc4200a5f20, 0x0, 0xc420052800, 0xc42043f630)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/unixsock_posix.go:162 +0x34
6ζ 05 09:39:39 xxx snapd[12416]: net.(*UnixListener).Accept(0xc4200a5f20, 0xc42043f630, 0xc42043f650, 0x5572b293ff3a, 0x30)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/unixsock.go:253 +0x4b
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/daemon.(*ucrednetListener).Accept(0xc4201b2120, 0x0, 0x0, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/ucrednet.go:110 +0x4f
6ζ 05 09:39:39 xxx snapd[12416]: net/http.(*Server).Serve(0xc42029ec30, 0x5572b38b4bc0, 0xc4201b2120, 0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/net/http/server.go:2773 +0x1a7
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/daemon.(*Daemon).Start.func1.1(0x0, 0x0)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/daemon/daemon.go:470 +0x4b
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420166e50, 0xc420371680)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 52 [select, 15 minutes]:
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/overlord/ifacestate/udevmonitor.(*Monitor).Run.func1(0xffffffffffffffff, 0xc4203f8898)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/overlord/ifacestate/udevmonitor/udevmon.go:147 +0x35a
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0xc420426090, 0xc4200b3540)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:163 +0x2d
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/vendor/gopkg.in/tomb.v2/tomb.go:159 +0xbb
6ζ 05 09:39:39 xxx snapd[12416]: goroutine 77 [syscall]:
6ζ 05 09:39:39 xxx snapd[12416]: syscall.Syscall6(0x17, 0x5, 0xc420063e38, 0x0, 0x0, 0x0, 0x0, 0xc420482a80, 0xc420063dc0, 0x5572b29630db)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/syscall/asm_linux_amd64.s:44 +0x5
6ζ 05 09:39:39 xxx snapd[12416]: syscall.Select(0x5, 0xc420063e38, 0x0, 0x0, 0x0, 0x0, 0xc420063e60, 0x5572b29597b6)
6ζ 05 09:39:39 xxx snapd[12416]: /usr/lib/go-1.10/src/syscall/zsyscall_linux_amd64.go:1367 +0xb0
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/osutil/udev/netlink.stopperSelectReadable(0x3, 0x4, 0xc420406180, 0x3d, 0xc420446030)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/rawsockstop.go:57 +0x160
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/osutil/udev/netlink.RawSockStopper.func1(0xc420577ec0, 0xc42024c020, 0x6)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/rawsockstop.go:31 +0x43
6ζ 05 09:39:39 xxx snapd[12416]: github.com/snapcore/snapd/osutil/udev/netlink.(*UEventConn).Monitor.func4(0xc420577ee0, 0xc4203f89c0, 0xc4203f8a20, 0xc4203f8a80, 0xc420607d20, 0x5572b38b7840, 0xc420577ec0, 0xc4203f8960)
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/conn.go:139 +0x3e
6ζ 05 09:39:39 xxx snapd[12416]: created by github.com/snapcore/snapd/osutil/udev/netlink.(*UEventConn).Monitor
6ζ 05 09:39:39 xxx systemd[1]: snapd.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
6ζ 05 09:39:39 xxx snapd[12416]: /build/snapd/parts/snapd-deb/build/_build/src/github.com/snapcore/snapd/osutil/udev/netlink/conn.go:136 +0x233
6ζ 05 09:39:39 xxx systemd[1]: snapd.service: Failed with result 'exit-code'.
6ζ 05 09:39:39 xxx systemd[1]: snapd.service: Scheduled restart job, restart counter is at 2.
6ζ 05 09:39:39 xxx systemd[1]: Stopped Snap Daemon.
6ζ 05 09:39:39 xxx systemd[1]: Starting Snap Daemon...
6ζ 05 09:39:39 xxx snapd[20613]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:39:39 xxx snapd[20613]: AppArmor status: apparmor is enabled and all features are available
6ζ 05 09:39:39 xxx snapd[20613]: daemon.go:347: started snapd/2.50.1 (series 16; classic) ubuntu/20.04 (amd64) linux/5.8.0-53-generic.
6ζ 05 09:39:40 xxx snapd[20613]: daemon.go:440: adjusting startup timeout by 1m10s (pessimistic estimate of 30s plus 5s per snap)
6ζ 05 09:39:40 xxx systemd[1]: Started Snap Daemon.