syzbot


BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!

Status: upstream: reported C repro on 2023/03/28 22:33
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+bab7a1cdf22616e99208@syzkaller.appspotmail.com
First crash: 879d, last: 2d10h
Fix bisection: failed (error log, bisect log)
  
Bug presence (3)
Date Name Commit Repro Result
2025/08/16 linux-6.1.y (ToT) 0bc96de781b4 C [report] BUG: MAX_LOCKDEP_CHAINS too low!
2023/07/20 upstream (ToT) 57f1f9dd3abe C [report] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/16 upstream (ToT) 90d970cade8e C Didn't crash
Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (6) btrfs -1 C 2 367d 368d 0/29 closed as invalid on 2024/08/30 15:02
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (3) btrfs -1 C 7 677d 677d 0/29 closed as invalid on 2023/10/17 19:49
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (5) btrfs -1 C 931 375d 406d 27/29 fixed on 2024/08/14 19:57
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (4) btrfs -1 C 8 671d 672d 0/29 closed as invalid on 2023/10/23 13:15
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (7) btrfs -1 C 1797 2h32m 344d 0/29 upstream: reported C repro on 2024/09/14 09:10
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! -1 C done error 25236 1922d 2363d 15/29 fixed on 2020/12/09 20:00
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (2) kernel -1 C 2688 683d 1639d 23/29 fixed on 2023/10/12 12:47
linux-5.15 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! missing-backport origin:upstream -1 C error 2 32d 741d 0/3 upstream: reported C repro on 2023/08/14 00:36

Sample crash report:
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 7481 Comm: syz-executor345 Not tainted 6.1.61-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 lookup_chain_cache_add kernel/locking/lockdep.c:3771 [inline]
 validate_chain kernel/locking/lockdep.c:3792 [inline]
 __lock_acquire+0x1b8c/0x764c kernel/locking/lockdep.c:5048
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5661
 fs_reclaim_acquire+0xbc/0x12c mm/page_alloc.c:4687
 might_alloc include/linux/sched/mm.h:271 [inline]
 prepare_alloc_pages+0x138/0x560 mm/page_alloc.c:5316
 __alloc_pages+0x150/0x730 mm/page_alloc.c:5534
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0xbc/0x21c mm/slab_common.c:1096
 kmalloc_large+0x2c/0xc8 mm/slab_common.c:1113
 kmalloc include/linux/slab.h:546 [inline]
 kzalloc include/linux/slab.h:689 [inline]
 lb_init+0x5c/0x3ac drivers/net/team/team_mode_loadbalance.c:614
 __team_change_mode+0x284/0x4a0 drivers/net/team/team.c:578
 team_change_mode drivers/net/team/team.c:612 [inline]
 team_mode_option_set+0x324/0x390 drivers/net/team/team.c:1388
 team_option_set drivers/net/team/team.c:374 [inline]
 team_nl_cmd_options_set+0x7e0/0xdec drivers/net/team/team.c:2682
 genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
 genl_rcv_msg+0x948/0xc2c net/netlink/genetlink.c:850
 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2508
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]
 netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1352
 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1874
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x558/0x844 net/socket.c:2499
 ___sys_sendmsg net/socket.c:2553 [inline]
 __sys_sendmsg+0x26c/0x33c net/socket.c:2582
 __do_sys_sendmsg net/socket.c:2591 [inline]
 __se_sys_sendmsg net/socket.c:2589 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2589
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
team2470: Mode changed to "loadbalance"

Crashes (140):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/07 09:00 linux-6.1.y 4a61839152cc 83211397 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2023/07/17 08:28 linux-6.1.y 61fd484b2cf6 35d9ecc5 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/22 09:50 linux-6.1.y 0bc96de781b4 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/22 02:32 linux-6.1.y 0bc96de781b4 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/22 01:04 linux-6.1.y 0bc96de781b4 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/21 22:47 linux-6.1.y 0bc96de781b4 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/21 02:22 linux-6.1.y 0bc96de781b4 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/20 22:46 linux-6.1.y 0bc96de781b4 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/19 18:28 linux-6.1.y 0bc96de781b4 254a27c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/19 08:35 linux-6.1.y 0bc96de781b4 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/19 07:25 linux-6.1.y 0bc96de781b4 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/13 22:43 linux-6.1.y 3594f306da12 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/13 08:24 linux-6.1.y 3594f306da12 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/13 02:23 linux-6.1.y 3594f306da12 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/11 16:34 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/11 16:33 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/11 15:30 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/09 00:11 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/07/19 22:21 linux-6.1.y 3369c6df2fae 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/07/09 02:34 linux-6.1.y 04d1ccaa9c28 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/07/07 07:24 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/29 10:16 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/28 20:41 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/27 02:58 linux-6.1.y da3c5173c55f 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/23 08:23 linux-6.1.y da3c5173c55f fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/19 18:44 linux-6.1.y 325285d9fc86 b84f0537 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/18 15:40 linux-6.1.y 325285d9fc86 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/10 02:38 linux-6.1.y 02b72ccb5f9d 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/05/03 00:50 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/25 23:46 linux-6.1.y 535ec20c5027 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/18 01:31 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/16 20:57 linux-6.1.y 420102835862 a95239b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/13 18:48 linux-6.1.y 420102835862 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/10 05:43 linux-6.1.y 3dfebb87d7eb 988b336c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/10 04:23 linux-6.1.y 3dfebb87d7eb 988b336c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/09 17:28 linux-6.1.y 3dfebb87d7eb 47d015b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/04/01 11:14 linux-6.1.y 8e60a714ba3b 36d76a97 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/29 12:36 linux-6.1.y 8e60a714ba3b cf25e2c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/25 08:13 linux-6.1.y 344a09659766 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/21 09:31 linux-6.1.y 344a09659766 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/20 02:40 linux-6.1.y 344a09659766 e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/20 00:43 linux-6.1.y 344a09659766 e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/03/05 01:24 linux-6.1.y 3a8358583626 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/02/24 06:17 linux-6.1.y 3a8358583626 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/02/21 01:14 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/02/11 23:44 linux-6.1.y 0cbb5f65e52f f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/02/08 15:36 linux-6.1.y 0cbb5f65e52f ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/02/03 09:01 linux-6.1.y 0cbb5f65e52f 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2023/03/28 22:33 linux-6.1.y e3a87a10f259 fc067f05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
* Struck through repros no longer work on HEAD.