* [syzbot] BUG: sleeping function called from invalid context in __purge_vmap_area_lazy
@ 2022-06-17 6:08 syzbot
2022-06-18 0:17 ` Andrew Morton
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2022-06-17 6:08 UTC (permalink / raw)
To: akpm, linux-kernel, linux-mm, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 6012273897fe Add linux-next specific files for 20220615
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16d2f608080000
kernel config: https://syzkaller.appspot.com/x/.config?x=b4154677977b1776
dashboard link: https://syzkaller.appspot.com/bug?extid=0bce0ec817c084f98c56
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0bce0ec817c084f98c56@syzkaller.appspotmail.com
BUG: sleeping function called from invalid context at mm/vmalloc.c:1759
BUG: sleeping function called from invalid context at mm/vmalloc.c:1759
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1795, name: kworker/1:2
preempt_count: 2, expected: 1
RCU nest depth: 0, expected: 0
4 locks held by kworker/1:2/1795:
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc90006c07da8 (drain_vmap_work){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
#2: ffffffff8bebb028 (vmap_purge_lock){+.+.}-{3:3}, at: drain_vmap_area_work+0x44/0xe0 mm/vmalloc.c:1781
#3: ffffffff8bebb2f8 (free_vmap_area_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:360 [inline]
#3: ffffffff8bebb2f8 (free_vmap_area_lock){+.+.}-{2:2}, at: __cond_resched_lock+0xa6/0xe0 kernel/sched/core.c:8306
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 1795 Comm: kworker/1:2 Not tainted 5.19.0-rc2-next-20220615-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events drain_vmap_area_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
__might_resched.cold+0x222/0x26b kernel/sched/core.c:9823
__purge_vmap_area_lazy+0x95c/0x1c50 mm/vmalloc.c:1759
drain_vmap_area_work+0x52/0xe0 mm/vmalloc.c:1782
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
</TASK>
BUG: workqueue leaked lock or atomic: kworker/1:2/0x00000001/1795
last function: drain_vmap_area_work
no locks held by kworker/1:2/1795.
CPU: 1 PID: 1795 Comm: kworker/1:2 Tainted: G W 5.19.0-rc2-next-20220615-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events drain_vmap_area_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
process_one_work.cold+0x96/0xb8 kernel/workqueue.c:2304
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
</TASK>
BUG: scheduling while atomic: kworker/1:2/1795/0x00000002
no locks held by kworker/1:2/1795.
Modules linked in:
Preemption disabled at:
[<0000000000000000>] 0x0
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [syzbot] BUG: sleeping function called from invalid context in __purge_vmap_area_lazy
2022-06-17 6:08 [syzbot] BUG: sleeping function called from invalid context in __purge_vmap_area_lazy syzbot
@ 2022-06-18 0:17 ` Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2022-06-18 0:17 UTC (permalink / raw)
To: syzbot
Cc: linux-kernel, linux-mm, syzkaller-bugs, Uladzislau Rezki (Sony),
Peter Zijlstra, Thomas Gleixner
On Thu, 16 Jun 2022 23:08:21 -0700 syzbot <syzbot+0bce0ec817c084f98c56@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 6012273897fe Add linux-next specific files for 20220615
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16d2f608080000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b4154677977b1776
> dashboard link: https://syzkaller.appspot.com/bug?extid=0bce0ec817c084f98c56
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
I don't get this. __purge_vmap_area_lazy() seems to be doing
everything right wrt its use of free_vmap_area_lock and the
cond_resched_lock().
It's a shame that the "Preemption disabled at:" thing isn't working.
Peter, Thomas: any ideas why this would happen?
Thanks.
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+0bce0ec817c084f98c56@syzkaller.appspotmail.com
>
> BUG: sleeping function called from invalid context at mm/vmalloc.c:1759
> BUG: sleeping function called from invalid context at mm/vmalloc.c:1759
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1795, name: kworker/1:2
> preempt_count: 2, expected: 1
> RCU nest depth: 0, expected: 0
> 4 locks held by kworker/1:2/1795:
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
> #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
> #1: ffffc90006c07da8 (drain_vmap_work){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
> #2: ffffffff8bebb028 (vmap_purge_lock){+.+.}-{3:3}, at: drain_vmap_area_work+0x44/0xe0 mm/vmalloc.c:1781
> #3: ffffffff8bebb2f8 (free_vmap_area_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:360 [inline]
> #3: ffffffff8bebb2f8 (free_vmap_area_lock){+.+.}-{2:2}, at: __cond_resched_lock+0xa6/0xe0 kernel/sched/core.c:8306
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 PID: 1795 Comm: kworker/1:2 Not tainted 5.19.0-rc2-next-20220615-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: events drain_vmap_area_work
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9823
> __purge_vmap_area_lazy+0x95c/0x1c50 mm/vmalloc.c:1759
> drain_vmap_area_work+0x52/0xe0 mm/vmalloc.c:1782
> process_one_work+0x996/0x1610 kernel/workqueue.c:2289
> worker_thread+0x665/0x1080 kernel/workqueue.c:2436
> kthread+0x2e9/0x3a0 kernel/kthread.c:376
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
> </TASK>
> BUG: workqueue leaked lock or atomic: kworker/1:2/0x00000001/1795
> last function: drain_vmap_area_work
> no locks held by kworker/1:2/1795.
> CPU: 1 PID: 1795 Comm: kworker/1:2 Tainted: G W 5.19.0-rc2-next-20220615-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: events drain_vmap_area_work
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> process_one_work.cold+0x96/0xb8 kernel/workqueue.c:2304
> worker_thread+0x665/0x1080 kernel/workqueue.c:2436
> kthread+0x2e9/0x3a0 kernel/kthread.c:376
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
> </TASK>
> BUG: scheduling while atomic: kworker/1:2/1795/0x00000002
> no locks held by kworker/1:2/1795.
> Modules linked in:
> Preemption disabled at:
> [<0000000000000000>] 0x0
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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2022-06-17 6:08 [syzbot] BUG: sleeping function called from invalid context in __purge_vmap_area_lazy syzbot
2022-06-18 0:17 ` Andrew Morton
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