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BUG: MAX_LOCKDEP_KEYS too low!

Status: upstream: reported C repro on 2023/04/09 03:19
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+0752173038063aaf3f0f@syzkaller.appspotmail.com
First crash: 1110d, last: 2d21h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/03/01 linux-6.1.y (ToT) 779f9571ac3e C [report] BUG: MAX_LOCKDEP_KEYS too low!
2023/05/16 upstream (ToT) f1fcbaa18b28 C [report] BUG: MAX_LOCKDEP_KEYS too low!
2026/03/01 upstream (ToT) eb71ab2bf722 C Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 BUG: MAX_LOCKDEP_KEYS too low! origin:upstream missing-backport -1 C error 30 10d 260d 0/2 upstream: reported C repro on 2025/08/05 18:25
linux-5.15 BUG: MAX_LOCKDEP_KEYS too low! origin:lts-only -1 C error 11 20d 1130d 0/3 upstream: reported C repro on 2023/03/20 08:38
upstream BUG: MAX_LOCKDEP_KEYS too low! net -1 C done error 3496 2126d 2370d 15/29 fixed on 2020/12/09 20:00
upstream BUG: MAX_LOCKDEP_KEYS too low! (2) no-reminders net nfc -1 C unreliable 8444 4h10m 1799d 0/29 upstream: reported C repro on 2021/05/19 17:35
▶ ▼ Fix bisection attempts (8)
Created Duration User Patch Repo Result
2026/04/01 18:25 1m fix candidate upstream error job log
2026/03/02 04:39 0m fix candidate upstream error job log
2024/05/30 16:17 18m bisect fix linux-6.1.y error job log
2024/03/09 00:25 1h36m bisect fix linux-6.1.y OK (0) job log log
2024/01/30 10:26 1h39m bisect fix linux-6.1.y OK (0) job log log
2023/12/17 03:59 1h25m bisect fix linux-6.1.y OK (0) job log log
2023/10/21 23:11 1h35m bisect fix linux-6.1.y OK (0) job log log
2023/09/18 07:56 1h41m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 register_lock_class+0x6b5/0x870 kernel/locking/lockdep.c:1319
 __lock_acquire+0x16f/0x7d10 kernel/locking/lockdep.c:4928
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 dev_reset_queue+0xfa/0x1a0 include/net/sch_generic.h:681
 netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline]
 dev_deactivate_many+0x6c1/0xcb0 net/sched/sch_generic.c:1349
 dev_deactivate+0x114/0x1b0 net/sched/sch_generic.c:1372
 linkwatch_do_dev+0x105/0x160 net/core/link_watch.c:166
 __linkwatch_run_queue+0x410/0x660 net/core/link_watch.c:221
 linkwatch_event+0x48/0x50 net/core/link_watch.c:264
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (82):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/20 12:40 linux-6.1.y 7c87defbd336 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/20 10:13 linux-6.1.y 7c87defbd336 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/12 12:21 linux-6.1.y 8e8fc038cad5 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/04 11:12 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/04 07:51 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/04 04:35 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/04 01:13 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/03 21:56 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/03 18:55 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/12/28 05:42 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/12/28 03:25 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/12/28 00:56 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/12/27 21:00 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/10/26 00:00 linux-6.1.y 8e6e2188d949 c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2023/12/28 14:06 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2023/11/17 00:26 linux-6.1.y fb2635ac69ab cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2023/05/14 09:15 linux-6.1.y bf4ad6fa4e53 2b9ba477 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2026/04/19 07:26 linux-6.1.y 7c87defbd336 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/06 20:32 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/05 22:26 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/05 21:56 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/05 21:17 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/05 20:48 linux-6.1.y 1989cd3d56e2 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/02 07:54 linux-6.1.y 1989cd3d56e2 0cb124d5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/04/01 04:44 linux-6.1.y 1989cd3d56e2 fb8b2c26 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/03/29 19:04 linux-6.1.y 1989cd3d56e2 b5ceaad2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/03/20 13:40 linux-6.1.y f2ddafa93a25 2f245add .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/03/02 00:47 linux-6.1.y 779f9571ac3e 43249bac .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/03/01 20:31 linux-6.1.y 779f9571ac3e 43249bac .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/02/28 20:47 linux-6.1.y 779f9571ac3e 43249bac .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/02/26 22:33 linux-6.1.y 779f9571ac3e ffa54287 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/02/14 16:34 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/02/14 04:46 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/02/14 03:36 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/01/29 10:53 linux-6.1.y cd9b81672742 0adc945e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/01/18 19:57 linux-6.1.y cd9b81672742 20d37d28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/01/11 03:58 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/01/08 06:39 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2026/01/03 16:33 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/10/25 06:49 linux-6.1.y 8e6e2188d949 c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/10/12 05:11 linux-6.1.y 882efbdd9d34 ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/10/05 10:09 linux-6.1.y 882efbdd9d34 49379ee0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/10/03 03:27 linux-6.1.y 882efbdd9d34 49379ee0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/09/13 09:25 linux-6.1.y 3db754f56897 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/09/05 19:40 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/08/26 12:19 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/08/11 14:15 linux-6.1.y 3594f306da12 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2025/01/07 12:55 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2024/04/25 08:12 linux-6.1.y 6741e066ec76 8bdc0f22 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2024/04/13 07:22 linux-6.1.y bf1e3b1cb1e0 c8349e48 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2024/04/08 22:11 linux-6.1.y 347385861c50 53df08b6 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2024/03/24 21:07 linux-6.1.y d7543167affd 0ea90952 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2023/06/05 07:34 linux-6.1.y d2869ace6eeb a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_KEYS too low!
2023/07/08 10:14 linux-6.1.y 61fd484b2cf6 668cb1fa .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/09/21 23:12 linux-6.1.y 363a599da6d9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/09/21 23:11 linux-6.1.y 363a599da6d9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/09/21 23:11 linux-6.1.y 363a599da6d9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2025/08/29 22:52 linux-6.1.y f89b6e15694c 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2024/11/02 12:27 linux-6.1.y 7c15117f9468 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2023/11/02 08:44 linux-6.1.y 32c9cdbe383c 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
2023/04/09 03:19 linux-6.1.y 543aff194ab6 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: MAX_LOCKDEP_KEYS too low!
* Struck through repros no longer work on HEAD.