Hello,
syzbot found the following issue on:
HEAD commit: d2b6f8a1 Merge tag 'xfs-5.13-merge-3' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=120f2da3d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=65c207250bba4efe
dashboard link: https://syzkaller.appspot.com/bug?extid=86efe6206c1373c8a7cc
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: [email protected]
=============================
WARNING: suspicious RCU usage
5.12.0-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:8304 Illegal context switch in RCU-bh read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 0
3 locks held by kworker/u4:7/11790:
#0:
ffff888011e93138
(
(wq_completion)netns
){+.+.}-{0:0}
, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
, at: set_work_data kernel/workqueue.c:616 [inline]
, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
#1:
ffffc90002377da8
(
net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
#2:
ffffffff8d672190
(
pernet_ops_rwsem
){++++}-{3:3}
, at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:557
stack backtrace:
CPU: 1 PID: 11790 Comm: kworker/u4:7 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
___might_sleep+0x229/0x2c0 kernel/sched/core.c:8304
get_next_corpse net/netfilter/nf_conntrack_core.c:2223 [inline]
nf_ct_iterate_cleanup+0x16d/0x450 net/netfilter/nf_conntrack_core.c:2245
nf_conntrack_cleanup_net_list+0x81/0x250 net/netfilter/nf_conntrack_core.c:2432
ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178
cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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On Wed, May 5, 2021 at 9:51 AM syzbot
<[email protected]> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: d2b6f8a1 Merge tag 'xfs-5.13-merge-3' of git://git.kernel...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=120f2da3d00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=65c207250bba4efe
> dashboard link: https://syzkaller.appspot.com/bug?extid=86efe6206c1373c8a7cc
>
> 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: [email protected]
#syz fix: rcu: Reject RCU_LOCKDEP_WARN() false positives
> =============================
> WARNING: suspicious RCU usage
> 5.12.0-syzkaller #0 Not tainted
> -----------------------------
> kernel/sched/core.c:8304 Illegal context switch in RCU-bh read-side critical section!
>
> other info that might help us debug this:
>
>
> rcu_scheduler_active = 2, debug_locks = 0
> 3 locks held by kworker/u4:7/11790:
> #0:
> ffff888011e93138
> (
> (wq_completion)netns
> ){+.+.}-{0:0}
> , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
> , at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
> , at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
> , at: set_work_data kernel/workqueue.c:616 [inline]
> , at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
> , at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
> #1:
> ffffc90002377da8
> (
> net_cleanup_work
> ){+.+.}-{0:0}
> , at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
> #2:
> ffffffff8d672190
> (
> pernet_ops_rwsem
> ){++++}-{3:3}
> , at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:557
>
> stack backtrace:
> CPU: 1 PID: 11790 Comm: kworker/u4:7 Not tainted 5.12.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: netns cleanup_net
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> ___might_sleep+0x229/0x2c0 kernel/sched/core.c:8304
> get_next_corpse net/netfilter/nf_conntrack_core.c:2223 [inline]
> nf_ct_iterate_cleanup+0x16d/0x450 net/netfilter/nf_conntrack_core.c:2245
> nf_conntrack_cleanup_net_list+0x81/0x250 net/netfilter/nf_conntrack_core.c:2432
> ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178
> cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595
> process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
> kthread+0x3b1/0x4a0 kernel/kthread.c:313
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
>
>
> ---
> 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 [email protected].
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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