Bug 206235 - kernel BUG at mm/slub.c:294
Summary: kernel BUG at mm/slub.c:294
Status: RESOLVED WILL_NOT_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Bluetooth (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: linux-bluetooth@vger.kernel.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-01-17 13:38 UTC by Steffen Nurpmeso
Modified: 2020-07-04 15:26 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.19.128
Subsystem:
Regression: No
Bisected commit-id:

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Description Steffen Nurpmeso 2020-01-17 13:38:51 UTC 
during a "sudo rfkill block all" with a bluealsa device still paired (normally i unpair first, first time i did not i think) i got this oops:

Jan 17 01:34:05 kent kernel: ------------[ cut here ]------------
Jan 17 01:34:05 kent kernel: kernel BUG at mm/slub.c:294!
Jan 17 01:34:05 kent kernel: invalid opcode: 0000 [#1] PREEMPT SMP PTI
Jan 17 01:34:05 kent kernel: CPU: 0 PID: 16328 Comm: rfkill Tainted: G         C        4.19.94-kent #1
Jan 17 01:34:05 kent kernel: Hardware name: LENOVO 81EU/LNVNB161216, BIOS 7PCN35WW 09/25/2018
Jan 17 01:34:05 kent kernel: RIP: 0010:__slab_free.isra.20+0x1b8/0x290
Jan 17 01:34:05 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Jan 17 01:34:05 kent kernel: RSP: 0018:ffffa6b840cebcc0 EFLAGS: 00010246
Jan 17 01:34:05 kent kernel: RAX: ffff95323b657a00 RBX: ffff95323b657a00 RCX: ffff95323b657a00
Jan 17 01:34:05 kent kernel: RDX: 0000000080200005 RSI: ffffdd2dc5ed9580 RDI: ffff953324d2b080
Jan 17 01:34:05 kent kernel: RBP: ffffa6b840cebd50 R08: 0000000000000001 R09: ffff95323b657a00
Jan 17 01:34:05 kent kernel: R10: 00001a05f5d98974 R11: 0000000000001400 R12: ffffdd2dc5ed9580
Jan 17 01:34:05 kent kernel: R13: ffff95323b657a00 R14: ffff953324d2b080 R15: 0000000000000000
Jan 17 01:34:05 kent kernel: FS:  00007f21f93c3740(0000) GS:ffff953326a00000(0000) knlGS:0000000000000000
Jan 17 01:34:05 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 17 01:34:05 kent kernel: CR2: 00007ffb6241f9d8 CR3: 000000010dbee002 CR4: 00000000003606f0
Jan 17 01:34:05 kent kernel: Call Trace:
Jan 17 01:34:05 kent kernel:  ? finish_wait+0x2a/0x60
Jan 17 01:34:05 kent kernel:  ? __hci_cmd_sync_ev+0x20a/0x230
Jan 17 01:34:05 kent kernel:  kmem_cache_free+0x195/0x1c0
Jan 17 01:34:05 kent kernel:  btrtl_shutdown_realtek+0x2b/0x50
Jan 17 01:34:05 kent kernel:  hci_dev_do_close+0x402/0x4c0
Jan 17 01:34:05 kent kernel:  hci_rfkill_set_block+0x37/0x50
Jan 17 01:34:05 kent kernel:  rfkill_set_block+0x8f/0x140
Jan 17 01:34:05 kent kernel:  rfkill_fop_write+0x12a/0x1d0
Jan 17 01:34:05 kent kernel:  __vfs_write+0x31/0x180
Jan 17 01:34:05 kent kernel:  vfs_write+0xa4/0x190
Jan 17 01:34:05 kent kernel:  ksys_write+0x52/0xd0
Jan 17 01:34:05 kent kernel:  do_syscall_64+0x5a/0x190
Jan 17 01:34:05 kent kernel:  ? prepare_exit_to_usermode+0x66/0x90
Jan 17 01:34:05 kent kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jan 17 01:34:05 kent kernel: RIP: 0033:0x7f21f94b0644
Jan 17 01:34:05 kent kernel: Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 b9 50 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
Jan 17 01:34:05 kent kernel: RSP: 002b:00007ffc78824028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
Jan 17 01:34:05 kent kernel: RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f21f94b0644
Jan 17 01:34:05 kent kernel: RDX: 0000000000000008 RSI: 00007ffc78824040 RDI: 0000000000000003
Jan 17 01:34:05 kent kernel: RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000000
Jan 17 01:34:05 kent kernel: R10: fffffffffffff088 R11: 0000000000000246 R12: 0000000000000000
Jan 17 01:34:05 kent kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Jan 17 01:34:05 kent kernel: Modules linked in: r8822be(C)
Jan 17 01:34:05 kent kernel: ---[ end trace 56293fc55f5cc3e0 ]---
Jan 17 01:34:05 kent kernel: RIP: 0010:__slab_free.isra.20+0x1b8/0x290
Jan 17 01:34:05 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Jan 17 01:34:05 kent kernel: RSP: 0018:ffffa6b840cebcc0 EFLAGS: 00010246
Jan 17 01:34:05 kent kernel: RAX: ffff95323b657a00 RBX: ffff95323b657a00 RCX: ffff95323b657a00
Jan 17 01:34:05 kent kernel: RDX: 0000000080200005 RSI: ffffdd2dc5ed9580 RDI: ffff953324d2b080
Jan 17 01:34:05 kent kernel: RBP: ffffa6b840cebd50 R08: 0000000000000001 R09: ffff95323b657a00
Jan 17 01:34:05 kent kernel: R10: 00001a05f5d98974 R11: 0000000000001400 R12: ffffdd2dc5ed9580
Jan 17 01:34:05 kent kernel: R13: ffff95323b657a00 R14: ffff953324d2b080 R15: 0000000000000000
Jan 17 01:34:05 kent kernel: FS:  00007f21f93c3740(0000) GS:ffff953326a00000(0000) knlGS:0000000000000000
Jan 17 01:34:05 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 17 01:34:05 kent kernel: CR2: 00007ffb6241f9d8 CR3: 000000010dbee002 CR4: 00000000003606f0

Linux kent 4.19.94-kent #1 SMP PREEMPT Sat Jan 11 22:44:47 CET 2020 x86_64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz GenuineIntel GNU/Linux
Comment 1 Steffen Nurpmeso 2020-03-07 20:21:24 UTC 
Hello.  I am now on 4.19.107 and "it happened again".
Semantic was slightly different, i realized the notebook is not going to sleep, and found un-KILLable bluetoothd and rfkill instances, i even had to shutdown the computer hard.  The following listing can be better understood with a snippet from my /root/zzz.sh that is invoked if acpid emits LID (close) events:

while :; do
   down_off
   lid_exists || break
   sleep 1
   lid_is_open && break
done

Here is the /var/log/kernel snippet:

Mar  7 02:14:37 kent kernel: ------------[ cut here ]------------
Mar  7 02:14:37 kent kernel: kernel BUG at mm/slub.c:294!
Mar  7 02:14:37 kent kernel: invalid opcode: 0000 [#1] PREEMPT SMP PTI
Mar  7 02:14:37 kent kernel: CPU: 0 PID: 2586 Comm: rfkill Tainted: G         C        4.19.107-kent #1
Mar  7 02:14:37 kent kernel: Hardware name: LENOVO 81EU/LNVNB161216, BIOS 7PCN35WW 09/25/2018
Mar  7 02:14:37 kent kernel: RIP: 0010:__slab_free.isra.20+0x1b8/0x290
Mar  7 02:14:37 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Mar  7 02:14:37 kent kernel: RSP: 0018:ffffaaf146b0fcc0 EFLAGS: 00010246
Mar  7 02:14:37 kent kernel: RAX: ffff9a160521b200 RBX: ffff9a160521b200 RCX: ffff9a160521b200
Mar  7 02:14:37 kent kernel: RDX: 000000008020001c RSI: ffffd9c745148680 RDI: ffff9a1724d2bb00
Mar  7 02:14:37 kent kernel: RBP: ffffaaf146b0fd50 R08: 0000000000000001 R09: ffff9a160521b200
Mar  7 02:14:37 kent kernel: R10: 00003847e37e51a5 R11: 0000000000001800 R12: ffffd9c745148680
Mar  7 02:14:37 kent kernel: R13: ffff9a160521b200 R14: ffff9a1724d2bb00 R15: 0000000000000000
Mar  7 02:14:37 kent kernel: FS:  00007f225c950740(0000) GS:ffff9a1726a00000(0000) knlGS:0000000000000000
Mar  7 02:14:37 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar  7 02:14:37 kent kernel: CR2: 00005560e4d20008 CR3: 0000000137ef4003 CR4: 00000000003606f0
Mar  7 02:14:37 kent kernel: Call Trace:
Mar  7 02:14:37 kent kernel:  ? finish_wait+0x2a/0x60
Mar  7 02:14:37 kent kernel:  ? __hci_cmd_sync_ev+0x20a/0x230
Mar  7 02:14:37 kent kernel:  kmem_cache_free+0x195/0x1c0
Mar  7 02:14:37 kent kernel:  btrtl_shutdown_realtek+0x2b/0x50
Mar  7 02:14:37 kent kernel:  hci_dev_do_close+0x402/0x4c0
Mar  7 02:14:37 kent kernel:  hci_rfkill_set_block+0x37/0x50
Mar  7 02:14:37 kent kernel:  rfkill_set_block+0x8f/0x140
Mar  7 02:14:37 kent kernel:  rfkill_fop_write+0x12a/0x1d0
Mar  7 02:14:37 kent kernel:  __vfs_write+0x31/0x180
Mar  7 02:14:37 kent kernel:  vfs_write+0xa4/0x190
Mar  7 02:14:37 kent kernel:  ksys_write+0x52/0xd0
Mar  7 02:14:37 kent kernel:  do_syscall_64+0x5a/0x190
Mar  7 02:14:37 kent kernel:  ? prepare_exit_to_usermode+0x66/0x90
Mar  7 02:14:37 kent kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Mar  7 02:14:37 kent kernel: RIP: 0033:0x7f225ca3d644
Mar  7 02:14:37 kent kernel: Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 b9 50 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
Mar  7 02:14:37 kent kernel: RSP: 002b:00007ffee1a70358 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
Mar  7 02:14:37 kent kernel: RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f225ca3d644
Mar  7 02:14:37 kent kernel: RDX: 0000000000000008 RSI: 00007ffee1a70370 RDI: 0000000000000003
Mar  7 02:14:37 kent kernel: RBP: 0000000000000001 R08: 0000000000000003 R09: 00000000000a3490
Mar  7 02:14:37 kent kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
Mar  7 02:14:37 kent kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Mar  7 02:14:37 kent kernel: Modules linked in: r8822be(C)
Mar  7 02:14:37 kent kernel: ---[ end trace 7e5fda7ca4b18e7f ]---
Mar  7 02:14:37 kent kernel: RIP: 0010:__slab_free.isra.20+0x1b8/0x290
Mar  7 02:14:37 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Mar  7 02:14:37 kent kernel: RSP: 0018:ffffaaf146b0fcc0 EFLAGS: 00010246
Mar  7 02:14:37 kent kernel: RAX: ffff9a160521b200 RBX: ffff9a160521b200 RCX: ffff9a160521b200
Mar  7 02:14:37 kent kernel: RDX: 000000008020001c RSI: ffffd9c745148680 RDI: ffff9a1724d2bb00
Mar  7 02:14:37 kent kernel: RBP: ffffaaf146b0fd50 R08: 0000000000000001 R09: ffff9a160521b200
Mar  7 02:14:37 kent kernel: R10: 00003847e37e51a5 R11: 0000000000001800 R12: ffffd9c745148680
Mar  7 02:14:37 kent kernel: R13: ffff9a160521b200 R14: ffff9a1724d2bb00 R15: 0000000000000000
Mar  7 02:14:37 kent kernel: FS:  00007f225c950740(0000) GS:ffff9a1726a00000(0000) knlGS:0000000000000000
Mar  7 02:14:37 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar  7 02:14:37 kent kernel: CR2: 00005560e4d20008 CR3: 0000000137ef4003 CR4: 00000000003606f0
Mar  7 02:14:41 kent kernel: PM: suspend entry (deep)
Mar  7 02:15:01 kent kernel: PM: Syncing filesystems ... done.
Mar  7 02:15:01 kent kernel: Freezing user space processes ...
Mar  7 02:15:01 kent kernel: Freezing of tasks failed after 20.004 seconds (1 tasks refusing to freeze, wq_busy=0):
Mar  7 02:15:01 kent kernel: rfkill          D    0  2586   2550 0x80080006
Mar  7 02:15:01 kent kernel: Call Trace:
Mar  7 02:15:01 kent kernel:  ? __schedule+0x248/0x760
Mar  7 02:15:01 kent kernel:  schedule+0x2a/0x80
Mar  7 02:15:01 kent kernel:  schedule_preempt_disabled+0xc/0x20
Mar  7 02:15:01 kent kernel:  __mutex_lock.isra.1+0x1ff/0x4f0
Mar  7 02:15:01 kent kernel:  rfkill_fop_release+0x1c/0xa0
Mar  7 02:15:01 kent kernel:  __fput+0x9d/0x1c0
Mar  7 02:15:01 kent kernel:  task_work_run+0x8a/0xb0
Mar  7 02:15:01 kent kernel:  do_exit+0x39a/0xaa0
Mar  7 02:15:01 kent kernel:  ? ksys_write+0x52/0xd0
Mar  7 02:15:01 kent kernel:  rewind_stack_do_exit+0x17/0x20
Mar  7 02:15:01 kent kernel: OOM killer enabled.
Mar  7 02:15:01 kent kernel: Restarting tasks ... done.
Mar  7 02:15:01 kent kernel: PM: suspend exit
Mar  7 02:15:02 kent kernel: PM: suspend entry (deep)
Mar  7 02:15:22 kent kernel: PM: Syncing filesystems ... done.
Mar  7 02:15:22 kent kernel: Freezing user space processes ...
Mar  7 02:15:22 kent kernel: Freezing of tasks failed after 20.003 seconds (1 tasks refusing to freeze, wq_busy=0):
Mar  7 02:15:22 kent kernel: rfkill          D    0  2586   2550 0x80080006
Mar  7 02:15:22 kent kernel: Call Trace:
Mar  7 02:15:22 kent kernel:  ? __schedule+0x248/0x760
Mar  7 02:15:22 kent kernel:  schedule+0x2a/0x80
Mar  7 02:15:22 kent kernel:  schedule_preempt_disabled+0xc/0x20
Mar  7 02:15:22 kent kernel:  __mutex_lock.isra.1+0x1ff/0x4f0
Mar  7 02:15:22 kent kernel:  rfkill_fop_release+0x1c/0xa0
Mar  7 02:15:22 kent kernel:  __fput+0x9d/0x1c0
Mar  7 02:15:22 kent kernel:  task_work_run+0x8a/0xb0
Mar  7 02:15:22 kent kernel:  do_exit+0x39a/0xaa0
Mar  7 02:15:22 kent kernel:  ? ksys_write+0x52/0xd0
Mar  7 02:15:22 kent kernel:  rewind_stack_do_exit+0x17/0x20
Mar  7 02:15:22 kent kernel: OOM killer enabled.
Mar  7 02:15:22 kent kernel: Restarting tasks ... done.
Mar  7 02:15:22 kent kernel: PM: suspend exit
Mar  7 02:15:23 kent kernel: PM: suspend entry (deep)
Mar  7 02:15:43 kent kernel: PM: Syncing filesystems ... done.
Mar  7 02:15:43 kent kernel: Freezing user space processes ...
Mar  7 02:15:43 kent kernel: Freezing of tasks failed after 20.004 seconds (1 tasks refusing to freeze, wq_busy=0):
Mar  7 02:15:43 kent kernel: rfkill          D    0  2586   2550 0x80080006
Mar  7 02:15:43 kent kernel: Call Trace:
Mar  7 02:15:43 kent kernel:  ? __schedule+0x248/0x760
Mar  7 02:15:43 kent kernel:  schedule+0x2a/0x80
Mar  7 02:15:43 kent kernel:  schedule_preempt_disabled+0xc/0x20
Mar  7 02:15:43 kent kernel:  __mutex_lock.isra.1+0x1ff/0x4f0
Mar  7 02:15:43 kent kernel:  rfkill_fop_release+0x1c/0xa0
Mar  7 02:15:43 kent kernel:  __fput+0x9d/0x1c0
Mar  7 02:15:43 kent kernel:  task_work_run+0x8a/0xb0
Mar  7 02:15:43 kent kernel:  do_exit+0x39a/0xaa0
Mar  7 02:15:43 kent kernel:  ? ksys_write+0x52/0xd0
Mar  7 02:15:43 kent kernel:  rewind_stack_do_exit+0x17/0x20
Mar  7 02:15:43 kent kernel: OOM killer enabled.
Mar  7 02:15:43 kent kernel: Restarting tasks ... done.
Mar  7 02:15:43 kent kernel: PM: suspend exit
Mar  7 02:15:44 kent kernel: PM: suspend entry (deep)
Mar  7 02:16:04 kent kernel: PM: Syncing filesystems ... done.
Mar  7 02:16:05 kent kernel: Freezing user space processes ...
Mar  7 02:16:05 kent kernel: Freezing of tasks failed after 20.005 seconds (1 tasks refusing to freeze, wq_busy=0):
Mar  7 02:16:05 kent kernel: rfkill          D    0  2586   2550 0x80080006
Mar  7 02:16:05 kent kernel: Call Trace:
Mar  7 02:16:05 kent kernel:  ? __schedule+0x248/0x760
Mar  7 02:16:05 kent kernel:  schedule+0x2a/0x80
Mar  7 02:16:05 kent kernel:  schedule_preempt_disabled+0xc/0x20
Mar  7 02:16:05 kent kernel:  __mutex_lock.isra.1+0x1ff/0x4f0
Mar  7 02:16:05 kent kernel:  rfkill_fop_release+0x1c/0xa0
Mar  7 02:16:05 kent kernel:  __fput+0x9d/0x1c0
Mar  7 02:16:05 kent kernel:  task_work_run+0x8a/0xb0
Mar  7 02:16:05 kent kernel:  do_exit+0x39a/0xaa0
Mar  7 02:16:05 kent kernel:  ? ksys_write+0x52/0xd0
Mar  7 02:16:05 kent kernel:  rewind_stack_do_exit+0x17/0x20
Mar  7 02:16:05 kent kernel: OOM killer enabled.
Mar  7 02:16:05 kent kernel: Restarting tasks ... done.
Mar  7 02:16:05 kent kernel: PM: suspend exit
Mar  7 02:16:06 kent kernel: PM: suspend entry (deep)
Mar  7 02:16:26 kent kernel: PM: Syncing filesystems ... done.
Mar  7 02:16:26 kent kernel: Freezing user space processes ...
Mar  7 02:16:26 kent kernel: Freezing of tasks failed after 20.009 seconds (1 tasks refusing to freeze, wq_busy=0):

... etc ...

Mar  7 02:22:25 kent kernel:  rewind_stack_do_exit+0x17/0x20
Mar  7 02:22:25 kent kernel: OOM killer enabled.
Mar  7 02:22:25 kent kernel: Restarting tasks ... done.
Mar  7 02:22:25 kent kernel: PM: suspend exit
Comment 2 Steffen Nurpmeso 2020-03-07 20:25:53 UTC 
P.S.: that zzz.sh has also

   command -v rfkill >/dev/null 2>&1 &&
      act '( rfkill block all ) </dev/null & sleep 2'

which should be the "rfkill".

I know the r8822be module (the only one, i cannot link it in) is in staging on 4.19.  (It seems to have been integrated in 5.4, yet i have had not time to update to that one.)  It works just fine, how ever large it is, but i want to remark that Wifi can get down to ISDN speed and less if i hear music via bluetooth.  Not always, but in such situations, if i stop listening to music via bluetooth, Wifi speed goes up to 3.6 Mbit per second (the maximum here) immediately.
Comment 3 Steffen Nurpmeso 2020-03-07 21:36:42 UTC 
And one more addition, because whereas r8822be for Wifi is in staging in 4.19, the bluetooth one is not, i think.  (No idea of kernel, actually.)  And the rfkill(1) did only act on bluetooth here, since Wifi was gone before:

Mar  7 01:56:37 kent rfkill: block set for type wlan
..
Mar  7 01:56:37 kent dhcpcd[516]: script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 1
Mar  7 02:14:16 kent root/acpid[2549]: 3: button/lid LID close
...
Mar  7 02:14:37 kent root/zzz[2585]: ( rfkill block all ) </dev/null & sleep 2
...
Mar  7 02:14:41 kent root/zzz[2608]: sync
Mar  7 02:14:41 kent root/zzz[2610]: echo mem > /sys/power/state
Mar  7 02:15:02 kent root/zzz[2615]: echo mem > /sys/power/state
Mar  7 02:15:23 kent root/zzz[2618]: echo mem > /sys/power/state
..in a loop until i realized it..

Ciao, and a nice Sunday i wish from Germany
Comment 4 Steffen Nurpmeso 2020-07-04 15:26:39 UTC 
Hello.
It happened again, but the trace is the same. I am updating to kernel series 5.4 now, so i close this, ok?  I post nonetheless because here the second RIP comes without the leading [cut here], which made me wonder a bit.

Jul  4 01:04:15 kent kernel: wlp1s0: deauthenticating from d0:5b:a8:4a:88:84 by local choice (Reason: 3=DEAUTH_LEAVING)
Jul  4 01:06:36 kent kernel: ------------[ cut here ]------------
Jul  4 01:06:36 kent kernel: kernel BUG at mm/slub.c:294!
Jul  4 01:06:36 kent kernel: invalid opcode: 0000 [#1] PREEMPT SMP PTI
Jul  4 01:06:36 kent kernel: CPU: 2 PID: 2563 Comm: rfkill Tainted: G         C        4.19.128-kent #1
Jul  4 01:06:36 kent kernel: Hardware name: LENOVO 81EU/LNVNB161216, BIOS 7PCN35WW 09/25/2018
Jul  4 01:06:36 kent kernel: RIP: 0010:__slab_free.isra.20+0x1be/0x2a0
Jul  4 01:06:36 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Jul  4 01:06:36 kent kernel: RSP: 0018:ffffb199c0ea3cd0 EFLAGS: 00010246
Jul  4 01:06:36 kent kernel: RAX: ffff99812a296d00 RBX: ffff99812a296d00 RCX: ffff99812a296d00
Jul  4 01:06:36 kent kernel: RDX: 0000000080200015 RSI: ffffe21e84a8a580 RDI: ffff998264d2b200
Jul  4 01:06:36 kent kernel: RBP: ffffb199c0ea3d60 R08: 0000000000000001 R09: ffff99812a296d00
Jul  4 01:06:36 kent kernel: R10: 0000310c568441a2 R11: 0000000000000400 R12: ffffe21e84a8a580
Jul  4 01:06:36 kent kernel: R13: ffff99812a296d00 R14: ffff998264d2b200 R15: 0000000000000000
Jul  4 01:06:36 kent kernel: FS:  00007f83a8795740(0000) GS:ffff998266a80000(0000) knlGS:0000000000000000
Jul  4 01:06:36 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul  4 01:06:36 kent kernel: CR2: 000055e1a95c65a8 CR3: 0000000132bba002 CR4: 00000000003606e0
Jul  4 01:06:36 kent kernel: Call Trace:
Jul  4 01:06:36 kent kernel:  ? finish_wait+0x2a/0x60
Jul  4 01:06:36 kent kernel:  ? __hci_cmd_sync_ev+0x20a/0x230
Jul  4 01:06:36 kent kernel:  kmem_cache_free+0x19b/0x1c0
Jul  4 01:06:36 kent kernel:  btrtl_shutdown_realtek+0x2b/0x50
Jul  4 01:06:36 kent kernel:  hci_dev_do_close+0x3cf/0x480
Jul  4 01:06:36 kent kernel:  hci_rfkill_set_block+0x37/0x50
Jul  4 01:06:36 kent kernel:  rfkill_set_block+0x8f/0x140
Jul  4 01:06:36 kent kernel:  rfkill_fop_write+0x12a/0x1d0
Jul  4 01:06:36 kent kernel:  __vfs_write+0x31/0x180
Jul  4 01:06:36 kent kernel:  vfs_write+0xa4/0x190
Jul  4 01:06:36 kent kernel:  ksys_write+0x52/0xd0
Jul  4 01:06:36 kent kernel:  do_syscall_64+0x5a/0x190
Jul  4 01:06:36 kent kernel:  ? prepare_exit_to_usermode+0x66/0x90
Jul  4 01:06:36 kent kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jul  4 01:06:36 kent kernel: RIP: 0033:0x7f83a8882644
Jul  4 01:06:36 kent kernel: Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 b9 50 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
Jul  4 01:06:36 kent kernel: RSP: 002b:00007fff97dfdf48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
Jul  4 01:06:36 kent kernel: RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f83a8882644
Jul  4 01:06:36 kent kernel: RDX: 0000000000000008 RSI: 00007fff97dfdf60 RDI: 0000000000000003
Jul  4 01:06:36 kent kernel: RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000000
Jul  4 01:06:36 kent kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
Jul  4 01:06:36 kent kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Jul  4 01:06:36 kent kernel: Modules linked in: r8822be(C)
Jul  4 01:06:36 kent kernel: ---[ end trace 4107545f4866f48c ]---
ul  4 01:06:36 kent kernel: RIP: 0010:__slab_free.isra.20+0x1be/0x2a0
Jul  4 01:06:36 kent kernel: Code: 75 6a 80 7c 24 4b 00 79 05 40 84 f6 74 1e 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 80 4c 24 4b 80 4d 89 ef e9 03 ff ff ff <0f> 0b 48 8d 65 d8 4c 89 e6 4c 89 f7 ba 01 00 00 00 5b 41 5c 41 5d
Jul  4 01:06:36 kent kernel: RSP: 0018:ffffb199c0ea3cd0 EFLAGS: 00010246
Jul  4 01:06:36 kent kernel: RAX: ffff99812a296d00 RBX: ffff99812a296d00 RCX: ffff99812a296d00
Jul  4 01:06:36 kent kernel: RDX: 0000000080200015 RSI: ffffe21e84a8a580 RDI: ffff998264d2b200
Jul  4 01:06:36 kent kernel: RBP: ffffb199c0ea3d60 R08: 0000000000000001 R09: ffff99812a296d00
Jul  4 01:06:36 kent kernel: R10: 0000310c568441a2 R11: 0000000000000400 R12: ffffe21e84a8a580
Jul  4 01:06:36 kent kernel: R13: ffff99812a296d00 R14: ffff998264d2b200 R15: 0000000000000000
Jul  4 01:06:36 kent kernel: FS:  00007f83a8795740(0000) GS:ffff998266a80000(0000) knlGS:0000000000000000
Jul  4 01:06:36 kent kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul  4 01:06:36 kent kernel: CR2: 000055e1a95c65a8 CR3: 0000000132bba002 CR4: 00000000003606e0
Jul  4 01:13:22 kent kernel: device v_i left promiscuous mode
Jul  4 01:13:22 kent kernel: v_br: port 1(v_i) entered disabled state
Jul  4 15:43:14 kent kernel: microcode: microcode updated early to revision 0xd6, date = 2020-04-27
Jul  4 15:43:14 kent kernel: Linux version 4.19.128-kent (guest@kent) (gcc version 8.4.0 (CRUX-x86_64-multilib)) #1 SMP PREEMPT Sat Jun 13 18:36:47 CEST 2020
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