* [syzbot] [net?] WARNING: ./include/net/netdev_lock.h:LINE at __linkwatch_sync_dev, CPU: kworker/u8:NUM/NUM
@ 2025-07-09 21:52 syzbot
2025-07-09 22:10 ` Kuniyuki Iwashima
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2025-07-09 21:52 UTC (permalink / raw)
To: cratiu, davem, edumazet, horms, kuba, kuniyu, linux-kernel,
netdev, pabeni, sdf, syzkaller-bugs, vladimir.oltean
Hello,
syzbot found the following issue on:
HEAD commit: 050f8ad7b58d Add linux-next specific files for 20250616
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ad8370580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d2efc7740224b93a
dashboard link: https://syzkaller.appspot.com/bug?extid=9196eb463ddf99a0be6e
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155c190c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109c95d4580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/49faa18d2f53/disk-050f8ad7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7c6f9cd7fe5d/vmlinux-050f8ad7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84a08d6403ee/bzImage-050f8ad7.xz
The issue was bisected to:
commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f
Author: Stanislav Fomichev <sdf@fomichev.me>
Date: Fri Apr 4 16:11:22 2025 +0000
net: hold instance lock during NETDEV_CHANGE
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16390dd4580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=15390dd4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=11390dd4580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9196eb463ddf99a0be6e@syzkaller.appspotmail.com
Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE")
------------[ cut here ]------------
RTNL: assertion failed at ./include/net/netdev_lock.h (72)
WARNING: ./include/net/netdev_lock.h:72 at netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline], CPU#0: kworker/u8:3/49
WARNING: ./include/net/netdev_lock.h:72 at __linkwatch_sync_dev+0x303/0x350 net/core/link_watch.c:279, CPU#0: kworker/u8:3/49
Modules linked in:
CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bond0 bond_mii_monitor
RIP: 0010:netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
RIP: 0010:__linkwatch_sync_dev+0x303/0x350 net/core/link_watch.c:279
Code: 7c fe ff ff e8 5e 7f 66 f8 c6 05 ce 6b 31 06 01 90 48 c7 c7 20 2f 93 8c 48 c7 c6 7a 32 9d 8d ba 48 00 00 00 e8 9e 1d 2a f8 90 <0f> 0b 90 90 e9 4d fe ff ff 44 89 f1 80 e1 07 38 c1 0f 8c 22 fd ff
RSP: 0018:ffffc90000ba7670 EFLAGS: 00010246
RAX: a4c1d8d5a4094c00 RBX: ffff888032708000 RCX: ffff8880222a5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa14 R12: 1ffff110064e105d
R13: dffffc0000000000 R14: ffffffff8c1c95e8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125c40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 000000007997c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ethtool_op_get_link+0x15/0x70 net/ethtool/ioctl.c:63
bond_check_dev_link+0x444/0x6c0 drivers/net/bonding/bond_main.c:863
bond_miimon_inspect drivers/net/bonding/bond_main.c:2745 [inline]
bond_mii_monitor+0x428/0x2e00 drivers/net/bonding/bond_main.c:2967
process_one_work kernel/workqueue.c:3235 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3318
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3399
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [net?] WARNING: ./include/net/netdev_lock.h:LINE at __linkwatch_sync_dev, CPU: kworker/u8:NUM/NUM
2025-07-09 21:52 [syzbot] [net?] WARNING: ./include/net/netdev_lock.h:LINE at __linkwatch_sync_dev, CPU: kworker/u8:NUM/NUM syzbot
@ 2025-07-09 22:10 ` Kuniyuki Iwashima
0 siblings, 0 replies; 2+ messages in thread
From: Kuniyuki Iwashima @ 2025-07-09 22:10 UTC (permalink / raw)
To: syzbot+9196eb463ddf99a0be6e, Jay Vosburgh
Cc: cratiu, davem, edumazet, horms, kuba, kuniyu, linux-kernel,
netdev, pabeni, sdf, syzkaller-bugs, vladimir.oltean
From: syzbot <syzbot+9196eb463ddf99a0be6e@syzkaller.appspotmail.com>
Date: Wed, 09 Jul 2025 14:52:32 -0700
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 050f8ad7b58d Add linux-next specific files for 20250616
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ad8370580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d2efc7740224b93a
> dashboard link: https://syzkaller.appspot.com/bug?extid=9196eb463ddf99a0be6e
> compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155c190c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109c95d4580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/49faa18d2f53/disk-050f8ad7.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7c6f9cd7fe5d/vmlinux-050f8ad7.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/84a08d6403ee/bzImage-050f8ad7.xz
>
> The issue was bisected to:
>
> commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f
> Author: Stanislav Fomichev <sdf@fomichev.me>
> Date: Fri Apr 4 16:11:22 2025 +0000
>
> net: hold instance lock during NETDEV_CHANGE
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16390dd4580000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=15390dd4580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11390dd4580000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+9196eb463ddf99a0be6e@syzkaller.appspotmail.com
> Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE")
>
> ------------[ cut here ]------------
> RTNL: assertion failed at ./include/net/netdev_lock.h (72)
> WARNING: ./include/net/netdev_lock.h:72 at netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline], CPU#0: kworker/u8:3/49
> WARNING: ./include/net/netdev_lock.h:72 at __linkwatch_sync_dev+0x303/0x350 net/core/link_watch.c:279, CPU#0: kworker/u8:3/49
> Modules linked in:
> CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full)
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> Workqueue: bond0 bond_mii_monitor
> RIP: 0010:netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
> RIP: 0010:__linkwatch_sync_dev+0x303/0x350 net/core/link_watch.c:279
> Code: 7c fe ff ff e8 5e 7f 66 f8 c6 05 ce 6b 31 06 01 90 48 c7 c7 20 2f 93 8c 48 c7 c6 7a 32 9d 8d ba 48 00 00 00 e8 9e 1d 2a f8 90 <0f> 0b 90 90 e9 4d fe ff ff 44 89 f1 80 e1 07 38 c1 0f 8c 22 fd ff
> RSP: 0018:ffffc90000ba7670 EFLAGS: 00010246
> RAX: a4c1d8d5a4094c00 RBX: ffff888032708000 RCX: ffff8880222a5a00
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
> RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
> R10: dffffc0000000000 R11: fffffbfff1bfaa14 R12: 1ffff110064e105d
> R13: dffffc0000000000 R14: ffffffff8c1c95e8 R15: 0000000000000000
> FS: 0000000000000000(0000) GS:ffff888125c40000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000200000000300 CR3: 000000007997c000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> ethtool_op_get_link+0x15/0x70 net/ethtool/ioctl.c:63
> bond_check_dev_link+0x444/0x6c0 drivers/net/bonding/bond_main.c:863
> bond_miimon_inspect drivers/net/bonding/bond_main.c:2745 [inline]
> bond_mii_monitor+0x428/0x2e00 drivers/net/bonding/bond_main.c:2967
> process_one_work kernel/workqueue.c:3235 [inline]
> process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3318
> worker_thread+0x8a0/0xda0 kernel/workqueue.c:3399
> kthread+0x711/0x8a0 kernel/kthread.c:464
> ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
>
>
> ---
> 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.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
Jay, could you test your patch below with the instruction above ?
https://lore.kernel.org/netdev/1912679.1750099002@famine/
Thanks!
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-07-09 22:10 UTC | newest]
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2025-07-09 21:52 [syzbot] [net?] WARNING: ./include/net/netdev_lock.h:LINE at __linkwatch_sync_dev, CPU: kworker/u8:NUM/NUM syzbot
2025-07-09 22:10 ` Kuniyuki Iwashima
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