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WARNING in __linkwatch_sync_dev (2)

Status: upstream: reported C repro on 2025/06/12 02:21
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+b8c48ea38ca27d150063@syzkaller.appspotmail.com
First crash: 35d, last: 10h31m
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH net-next] bonding: Remove support for use_carrier = 0 8 (8) 2025/06/17 18:01
[PATCH net] bonding: switch bond_miimon_inspect to rtnl lock 4 (4) 2025/06/16 23:21
[syzbot] [net?] WARNING in __linkwatch_sync_dev (2) 3 (6) 2025/06/16 16:07
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __linkwatch_sync_dev net -1 C done 1038 35d 99d 28/29 fixed on 2025/06/10 16:19
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/06/16 15:54 12m stfomichev@gmail.com patch upstream report log

Sample crash report:
------------[ cut here ]------------
RTNL: assertion failed at ./include/net/netdev_lock.h (72)
WARNING: CPU: 2 PID: 60 at ./include/net/netdev_lock.h:72 netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
WARNING: CPU: 2 PID: 60 at ./include/net/netdev_lock.h:72 __linkwatch_sync_dev+0x1ed/0x230 net/core/link_watch.c:279
Modules linked in:
CPU: 2 UID: 0 PID: 60 Comm: kworker/u32:3 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
RIP: 0010:netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
RIP: 0010:__linkwatch_sync_dev+0x1ed/0x230 net/core/link_watch.c:279
Code: 05 ff ff ff e8 94 b6 59 f8 c6 05 e9 0f 2e 07 01 90 ba 48 00 00 00 48 c7 c6 c0 8c e3 8c 48 c7 c7 60 8c e3 8c e8 94 7b 18 f8 90 <0f> 0b 90 90 e9 d6 fe ff ff 48 c7 c7 44 3b a8 90 e8 ae 86 c0 f8 e9
RSP: 0018:ffffc90000ce79f0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880363a2000 RCX: ffffffff817ae368
RDX: ffff888022148000 RSI: ffffffff817ae375 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff9200019cf48
R13: ffff8880363a2cc5 R14: ffffffff8c5909c0 R15: ffffffff899ba310
FS:  0000000000000000(0000) GS:ffff8880d6954000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd4122af9c CR3: 000000000e382000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ethtool_op_get_link+0x1d/0x70 net/ethtool/ioctl.c:63
 bond_check_dev_link+0x3f9/0x710 drivers/net/bonding/bond_main.c:863
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2745 [inline]
 bond_mii_monitor+0x3c0/0x2dc0 drivers/net/bonding/bond_main.c:2967
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (474):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/13 20:29 upstream 27605c8c0f69 0e8da31f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/12 15:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __linkwatch_sync_dev
2025/07/02 20:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 3c795c3404e8 0cd59a8f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __linkwatch_sync_dev
2025/07/13 09:56 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __linkwatch_sync_dev
2025/07/09 03:23 upstream d006330be3f7 abade794 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/07/08 11:40 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/07/08 08:27 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/07/01 12:51 upstream 66701750d556 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/07/01 01:07 upstream d0b3b7b22dfa 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/30 08:08 upstream d0b3b7b22dfa fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/06/30 03:43 upstream afa9a6f4f574 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/29 15:42 upstream dfba48a70cb6 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/29 05:22 upstream aaf724ed6926 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/06/29 04:18 upstream dfba48a70cb6 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/14 17:11 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __linkwatch_sync_dev
2025/06/30 03:14 upstream d0b3b7b22dfa fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/06/29 09:56 upstream dfba48a70cb6 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/07/16 01:39 upstream 155a3c003e55 03fcfc4b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/15 10:13 upstream 155a3c003e55 03fcfc4b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/14 18:17 upstream 347e9f5043c8 d8fc7335 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/13 19:20 upstream 5d5d62298b8b 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/12 21:43 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/12 16:20 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/11 01:56 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/10 09:26 upstream 8c2e52ebbe88 d7384b6d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/09 14:11 upstream 733923397fd9 956bd956 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/09 11:37 upstream 733923397fd9 f4e5e155 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/08 22:45 upstream d006330be3f7 4d9fdfa4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/07/08 20:27 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/08 04:09 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/07 18:21 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/07 10:35 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/06 19:11 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/06 12:00 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/06 10:49 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/06 03:12 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/05 22:19 upstream a79a588fc176 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/05 13:49 upstream a79a588fc176 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/05 00:22 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/04 22:37 upstream c435a4f487e8 d869b261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/03 19:03 upstream 17bbde2e1716 a3c808e4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/02 12:10 upstream 66701750d556 0cd59a8f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/02 06:07 upstream 66701750d556 bc80e4f0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/01 21:30 upstream 66701750d556 091a06cd .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/01 10:04 upstream 66701750d556 6e83b42d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/01 03:06 upstream 66701750d556 6e83b42d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/06/30 06:41 upstream d0b3b7b22dfa fc9d8ee5 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/30 02:27 upstream afa9a6f4f574 fc9d8ee5 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/29 15:38 upstream dfba48a70cb6 fc9d8ee5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/06/10 22:16 upstream f09079bd04a9 5d7e17ca .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/10 19:38 upstream f09079bd04a9 5d7e17ca .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/07/11 16:43 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 WARNING in __linkwatch_sync_dev
2025/07/10 18:20 upstream bc9ff192a6c9 d7384b6d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __linkwatch_sync_dev
2025/07/08 22:46 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __linkwatch_sync_dev
2025/07/06 14:58 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __linkwatch_sync_dev
2025/07/01 03:27 upstream 66701750d556 6e83b42d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __linkwatch_sync_dev
2025/06/28 08:42 upstream 35e261cd95dd fc9d8ee5 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 WARNING in __linkwatch_sync_dev
2025/07/08 08:24 net 1e3b66e32601 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __linkwatch_sync_dev
2025/07/01 01:04 net-next 647496422ba9 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __linkwatch_sync_dev
2025/07/09 00:35 linux-next 58ba80c47402 abade794 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/07/01 04:29 linux-next 1343433ed389 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/30 02:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __linkwatch_sync_dev
* Struck through repros no longer work on HEAD.