linux-kernel - Re: [BUG] wait_task_inactive() WARN_ON() in __kthread_bind

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Date:   Fri, 2 Jun 2023 11:05:36 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Z qiang <qiang.zhang1211@...il.com>
Cc:     tj@...nel.org, jiangshanlai@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [BUG] wait_task_inactive() WARN_ON() in __kthread_bind_mask()

On Fri, Jun 02, 2023 at 04:18:34PM +0800, Z qiang wrote:
> >
> > Hello!
> >
> > I just now saw this in SRCU-P rcutorture testing.  It might well be a
> > one-off, but I thought I should pass it along in case someone else is
> > seeing similar things.
> >
> > I don't immediately see how this would be related, but who knows?
> >
> > https://lore.kernel.org/lkml/20230524035339.25185-1-qiang.zhang1211@gmail.com/
> >
> > Thoughts?
> >
> 
> Hi Paul
> 
> This looks like another problem.  syzbot seems to have reported
> similar issues before:
> 
> https://lore.kernel.org/lkml/0000000000005ca92705d877448c@google.com/
> 
> I will also be doing the rcutorture testing

Thank you, and I will let you know if this happens again.  Right now it
looks like a one-off.  :-/

							Thanx, Paul

> Thanks
> Zqiang
> 
> >
> >
> >                                                         Thanx, Paul
> >
> > ------------------------------------------------------------------------
> >
> > [ 1726.040567] ------------[ cut here ]------------
> > [ 1726.040569] WARNING: CPU: 3 PID: 2016 at kernel/kthread.c:515 __kthread_bind_mask+0x18/0x60
> > [ 1726.040581] Modules linked in:
> > [ 1726.040584] CPU: 3 PID: 2016 Comm: kworker/7:3 Not tainted 6.4.0-rc1-00072-g99f9f93c0bce #5209
> > [ 1726.040588] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
> > [ 1726.040594] RIP: 0010:__kthread_bind_mask+0x18/0x60
> > [ 1726.040598] Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 48 89 f5 89 d6 53 48 89 fb e8 8d 5a 01 00 48 85 c0 75 0d <0f> 0b 5b 5d 41 5c 41 5d c3 cc cc cc cc 4c 8d a3 00 09 00 00 4c 89
> > [ 1726.040601] RSP: 0000:ffff97c7c1ecfe78 EFLAGS: 00010246
> > [ 1726.040604] RAX: 0000000000000000 RBX: ffff90ce82918000 RCX: 0000000000000000
> > [ 1726.040606] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff90ce82918000
> > [ 1726.040607] RBP: ffff90ce81047248 R08: 0000000000000001 R09: ffffffff9cab5d97
> > [ 1726.040609] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
> > [ 1726.040610] R13: ffff90ce9f5ee460 R14: ffff97c7c1ecfea0 R15: ffff90ce812ef840
> > [ 1726.040614] FS:  0000000000000000(0000) GS:ffff90ce9f4c0000(0000) knlGS:0000000000000000
> > [ 1726.040616] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 1726.040618] CR2: 0000000000000000 CR3: 0000000014648000 CR4: 00000000000006e0
> > [ 1726.040619] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 1726.040621] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 1726.040622] Call Trace:
> > [ 1726.040624]  <TASK>
> > [ 1726.040630]  create_worker+0xf1/0x220
> > [ 1726.040637]  worker_thread+0x2e4/0x3b0
> > [ 1726.040641]  ? __pfx_worker_thread+0x10/0x10
> > [ 1726.040643]  kthread+0xe6/0x120
> > [ 1726.040648]  ? __pfx_kthread+0x10/0x10
> > [ 1726.040651]  ret_from_fork+0x2c/0x50
> > [ 1726.040658]  </TASK>
> > [ 1726.040659] irq event stamp: 34
> > [ 1726.040661] hardirqs last  enabled at (33): [<ffffffff9da014ea>] asm_sysvec_call_function_single+0x1a/0x20
> > [ 1726.040668] hardirqs last disabled at (34): [<ffffffff9d95cead>] __schedule+0x67d/0xd20
> > [ 1726.040675] softirqs last  enabled at (0): [<ffffffff9ca82da8>] copy_process+0xb98/0x1f10
> > [ 1726.040681] softirqs last disabled at (0): [<0000000000000000>] 0x0
> > [ 1726.040685] ---[ end trace 0000000000000000 ]---