syzbot


BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (6)

Status: closed as invalid on 2024/08/30 15:02
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+dfb6eff2a68b42d557d3@syzkaller.appspotmail.com
First crash: 57d, last: 53d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (6) 5 (6) 2024/08/30 16:00
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (3) btrfs C 7 362d 362d 0/28 closed as invalid on 2023/10/17 19:49
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (5) btrfs C 931 61d 91d 27/28 fixed on 2024/08/14 19:57
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (4) btrfs C 8 357d 358d 0/28 closed as invalid on 2023/10/23 13:15
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (7) btrfs C 38 1d22h 29d 0/28 upstream: reported C repro on 2024/09/14 09:10
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! C done error 25236 1608d 2048d 15/28 fixed on 2020/12/09 20:00
upstream BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (2) kernel C 2688 368d 1324d 23/28 fixed on 2023/10/12 12:47
linux-5.15 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! origin:upstream missing-backport C error 2 1d12h 427d 0/3 upstream: reported C repro on 2023/08/14 00:36
linux-6.1 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! origin:upstream C error 21 286d 565d 0/3 upstream: reported C repro on 2023/03/28 22:33

Sample crash report:
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 2037 Comm: kworker/u8:8 Not tainted 6.11.0-rc3-syzkaller-g5c43d43bad35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: btrfs-endio-write btrfs_work_helper
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119
 dump_stack+0x1c/0x28 lib/dump_stack.c:128
 lookup_chain_cache_add kernel/locking/lockdep.c:3815 [inline]
 validate_chain kernel/locking/lockdep.c:3836 [inline]
 __lock_acquire+0x1fa0/0x779c kernel/locking/lockdep.c:5142
 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 free_extent_buffer_stale+0x2c/0x1ec fs/btrfs/extent_io.c:3333
 btrfs_force_cow_block+0xf2c/0x1c9c fs/btrfs/ctree.c:659
 btrfs_cow_block+0x318/0xa28 fs/btrfs/ctree.c:754
 btrfs_search_slot+0xba0/0x2a08
 btrfs_lookup_file_extent+0x124/0x1bc fs/btrfs/file-item.c:267
 btrfs_drop_extents+0x370/0x2ad8 fs/btrfs/file.c:251
 insert_reserved_file_extent+0x2b4/0xa6c fs/btrfs/inode.c:2911
 insert_ordered_extent_file_extent+0x348/0x508 fs/btrfs/inode.c:3016
 btrfs_finish_one_ordered+0x6a0/0x129c fs/btrfs/inode.c:3124
 btrfs_finish_ordered_io+0x120/0x134 fs/btrfs/inode.c:3266
 finish_ordered_fn+0x20/0x30 fs/btrfs/ordered-data.c:331
 btrfs_work_helper+0x340/0xd28 fs/btrfs/async-thread.c:314
 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x938/0xebc kernel/workqueue.c:3390
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/17 19:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5c43d43bad35 dbc93b08 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2024/08/22 02:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 048499f92ed7 ca02180f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
* Struck through repros no longer work on HEAD.