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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
Fix commit: bonding: Remove support for use_carrier
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 99d, last: 5h28m
Cause bisection: introduced by (bisect log) :
commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f
Author: Stanislav Fomichev <sdf@fomichev.me>
Date: Fri Apr 4 16:11:22 2025 +0000

  net: hold instance lock during NETDEV_CHANGE

Crash: WARNING in __linkwatch_sync_dev (log)
Repro: C syz .config
  
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
Re: [PATCH net-next] bonding: Remove support for use_carrier 5 (5) 2025/09/03 09:50
[PATCH net-next] bonding: Remove support for use_carrier = 0 9 (9) 2025/08/04 15:53
[syzbot] [net?] WARNING in __linkwatch_sync_dev (2) 4 (9) 2025/08/02 23:28
[PATCH net] bonding: switch bond_miimon_inspect to rtnl lock 4 (4) 2025/06/16 23:21
▶ ▼ 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 99d 163d 28/29 fixed on 2025/06/10 16:19
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/08/02 23:09 17m hdanton@sina.com patch upstream OK log
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: 0 PID: 36 at ./include/net/netdev_lock.h:72 netdev_ops_assert_locked include/net/netdev_lock.h:72 [inline]
WARNING: CPU: 0 PID: 36 at ./include/net/netdev_lock.h:72 __linkwatch_sync_dev+0x303/0x350 net/core/link_watch.c:279
Modules linked in:
CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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 8e a3 53 f8 c6 05 ba 84 21 06 01 90 48 c7 c7 e0 d2 94 8c 48 c7 c6 03 11 a0 8d ba 48 00 00 00 e8 6e 40 17 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:ffffc90000ac7670 EFLAGS: 00010246
RAX: 2641dd87e7d38e00 RBX: ffff88802b458000 RCX: ffff88801d6f5a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa22c R12: 1ffff1100568b05d
R13: dffffc0000000000 R14: ffffffff8c1cff48 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00003e720 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ethtool_op_get_link+0x15/0x70 net/ethtool/ioctl.c:63
 bond_check_dev_link+0x447/0x6c0 drivers/net/bonding/bond_main.c:865
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2762 [inline]
 bond_mii_monitor+0x428/0x2e00 drivers/net/bonding/bond_main.c:2984
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (839):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/15 22:42 upstream f83ec76bf285 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/08/26 06:23 upstream b6add54ba618 bf27483f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
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
2025/07/29 13:06 net afd8c2c9e2e2 c4a95487 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __linkwatch_sync_dev
2025/07/26 01:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 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
2025/09/05 10:08 upstream d69eb204c255 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/03 21:36 upstream ec299e4dc21e 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/03 08:29 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/03 01:13 upstream e6b9dce0aeeb 091ba174 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/02 13:30 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/02 07:47 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/01 23:52 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/01 19:02 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/01 09:37 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/09/01 09:28 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/31 18:01 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/31 14:05 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/31 12:24 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/31 10:49 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/30 20:15 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/30 14:09 upstream 11e7861d680c 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/30 08:53 upstream 11e7861d680c 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/24 09:42 upstream 8d245acc1e88 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __linkwatch_sync_dev
2025/08/12 22:07 upstream 53e760d89498 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __linkwatch_sync_dev
2025/07/31 14:15 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root 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
2025/07/26 04:20 upstream 327579671a9b fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in __linkwatch_sync_dev
2025/09/18 07:18 upstream d4b779985a6c e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/18 04:24 upstream d4b779985a6c e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/16 20:50 upstream 46a51f4f5eda e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/13 20:27 upstream 5cd64d4f9268 e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/13 19:13 upstream 5cd64d4f9268 e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/13 03:37 upstream 22f20375f5b7 e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/11 16:30 upstream 02ffd6f89c50 e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/11 06:54 upstream 7aac71907bde fdeaa69b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/10 18:52 upstream 9dd1835ecda5 fdeaa69b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/10 11:08 upstream 9dd1835ecda5 fdeaa69b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/09 11:53 upstream f777d1112ee5 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/08 19:32 upstream f777d1112ee5 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/08 09:18 upstream 76eeb9b8de98 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/07 21:10 upstream 6ab41fca2e80 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/07 16:07 upstream b236920731dd d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/06 22:16 upstream b236920731dd d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/06 20:16 upstream d1d10cea0895 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/06 16:12 upstream d1d10cea0895 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/06 14:20 upstream d1d10cea0895 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/06 10:12 upstream d1d10cea0895 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/05 19:36 upstream c8ed9b5c02a5 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/09/03 14:32 upstream e6b9dce0aeeb 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/30 11:06 upstream 11e7861d680c 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/29 17:43 upstream fb679c832b64 3e1beec6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/29 14:02 upstream 07d9df80082b 3e1beec6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/29 09:08 upstream 07d9df80082b 3e1beec6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/28 19:02 upstream 07d9df80082b bee60a83 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/28 10:19 upstream 07d9df80082b bee60a83 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/28 05:51 upstream 39f90c196721 e12e5ba4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/27 18:36 upstream 39f90c196721 e12e5ba4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/27 13:27 upstream fab1beda7597 e12e5ba4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/27 12:04 upstream fab1beda7597 e12e5ba4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __linkwatch_sync_dev
2025/08/27 03:42 upstream fab1beda7597 e12e5ba4 .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
2025/06/10 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
2025/08/20 09:45 upstream b19a97d57c15 79512909 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in __linkwatch_sync_dev
2025/07/28 15:43 upstream 038d61fd6422 032c6886 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 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
2025/06/28 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
2025/08/20 02:15 net 01792bc3e5bd 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __linkwatch_sync_dev
2025/08/24 08:39 net-next b1c92cdf5af3 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __linkwatch_sync_dev
2025/08/26 03:10 linux-next 7fa4d8dc380f bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __linkwatch_sync_dev
2025/08/17 15:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 1804e95e .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.