syzbot

 sign-in | mailing list | source | docs
🐞 Open [1600]
≡ Subsystems
🐞 Fixed [6308]
🐞 Invalid [16053]
⬇ Missing Backports [190]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

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: 8d19h, last: 28m
▶ ▼ 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 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __linkwatch_sync_dev net C done 1038 9d01h 72d 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 (152):
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
2025/06/19 14:23 upstream fb4d33ab452e ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/06/19 07:54 upstream fb4d33ab452e ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __linkwatch_sync_dev
2025/06/17 23:33 upstream 4663747812d1 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/17 21:02 upstream 9afe652958c3 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/06/17 16:17 upstream 9afe652958c3 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/17 13:14 upstream 9afe652958c3 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/16 07:13 upstream 08215f5486ec 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __linkwatch_sync_dev
2025/06/15 17:41 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/06/15 14:34 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/15 11:13 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/15 11:12 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/15 11:12 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/15 11:12 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/14 17:57 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __linkwatch_sync_dev
2025/06/14 17:57 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __linkwatch_sync_dev
2025/06/14 17:24 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/14 17:24 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce 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
2025/06/14 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
2025/06/16 13:17 upstream e04c78d86a96 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/06/15 11:15 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/06/15 11:15 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/06/18 23:34 upstream 74b4cc9b8780 ed3e87f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/17 13:15 upstream 9afe652958c3 74c9d252 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/17 03:14 upstream 9afe652958c3 d1716036 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/17 00:40 upstream e04c78d86a96 d1716036 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/16 23:07 upstream e04c78d86a96 d1716036 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/06/16 11:42 upstream e04c78d86a96 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/16 07:09 upstream 08215f5486ec 5f4b362d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/06/16 05:25 upstream 08215f5486ec 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:16 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:16 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:12 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:12 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:11 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 11:11 upstream 8c6bc74c7f89 5f4b362d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __linkwatch_sync_dev
2025/06/15 11:11 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 06:34 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/15 05:29 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/06/14 17:26 upstream 4774cfe3543a 5f4b362d .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
2025/06/19 10:30 upstream 74b4cc9b8780 ed3e87f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 WARNING in __linkwatch_sync_dev
2025/06/18 07:21 upstream 4663747812d1 e77fae15 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 WARNING in __linkwatch_sync_dev
2025/06/16 09:05 upstream e04c78d86a96 5f4b362d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __linkwatch_sync_dev
2025/06/19 06:34 net-next 253833da4e56 ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __linkwatch_sync_dev
2025/06/19 07:49 linux-next 6e5ab6fee68d ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/17 22:03 linux-next 4325743c7e20 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/17 22:03 linux-next 4325743c7e20 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/17 15:12 linux-next 4325743c7e20 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/15 11:17 linux-next bc6e0ba6c9ba 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/15 11:17 linux-next bc6e0ba6c9ba 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/15 11:17 linux-next bc6e0ba6c9ba 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/14 19:14 linux-next bc6e0ba6c9ba 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/06/15 11:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __linkwatch_sync_dev
2025/06/15 11:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .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.