Hello,
syzbot found the following issue on:
HEAD commit: c295ba49917a Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=135804fe680000
kernel config: https://syzkaller.appspot.com/x/.config?x=f27cd6e68911e026
dashboard link: https://syzkaller.appspot.com/bug?extid=6aa88a2d31fbec170f8b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d48d09680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13498275680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/045554f2bee6/disk-c295ba49.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ba2705f8a872/vmlinux-c295ba49.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e36242e95b79/Image-c295ba49.gz.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/39a4eecc45c3/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/3a9106a526c9/mount_1.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 11455 Comm: kworker/u4:4 Not tainted 6.6.0-rc6-syzkaller-gc295ba49917a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: btrfs-qgroup-rescan btrfs_work_helper
Call trace:
dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
dump_stack+0x1c/0x28 lib/dump_stack.c:113
lookup_chain_cache_add kernel/locking/lockdep.c:3815 [inline]
validate_chain kernel/locking/lockdep.c:3836 [inline]
__lock_acquire+0x1c60/0x75e8 kernel/locking/lockdep.c:5136
lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753
__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]
btrfs_reduce_alloc_profile fs/btrfs/block-group.c:83 [inline]
btrfs_get_alloc_profile+0x2b8/0xad4 fs/btrfs/block-group.c:138
get_alloc_profile_by_root fs/btrfs/extent-tree.c:2508 [inline]
btrfs_reserve_extent+0x1b8/0x674 fs/btrfs/extent-tree.c:4502
btrfs_alloc_tree_block+0x1b0/0x1444 fs/btrfs/extent-tree.c:4931
__btrfs_cow_block+0x3f4/0x1924 fs/btrfs/ctree.c:546
btrfs_cow_block+0x314/0xa0c fs/btrfs/ctree.c:724
btrfs_search_slot+0xb8c/0x29d8
btrfs_update_root+0xe4/0xa88 fs/btrfs/root-tree.c:137
commit_fs_roots+0x428/0x69c fs/btrfs/transaction.c:1473
btrfs_commit_transaction+0x10ec/0x2dd4 fs/btrfs/transaction.c:2418
btrfs_qgroup_rescan_worker+0x15fc/0x1674 fs/btrfs/qgroup.c:3417
btrfs_work_helper+0x340/0x1504 fs/btrfs/async-thread.c:314
process_one_work+0x694/0x1204 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0x938/0xef4 kernel/workqueue.c:2784
kthread+0x288/0x310 kernel/kthread.c:388
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857
BTRFS info (device loop3): qgroup scan completed (inconsistency flag cleared)
BTRFS info (device loop1): qgroup scan completed (inconsistency flag cleared)
BTRFS info (device loop2): qgroup scan completed (inconsistency flag cleared)
BTRFS info (device loop4): qgroup scan completed (inconsistency flag cleared)
BTRFS info (device loop2): qgroup scan completed (inconsistency flag cleared)
BTRFS info (device loop3): qgroup scan completed (inconsistency flag cleared)
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
On Tue, Oct 17, 2023 at 08:53:45AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: c295ba49917a Merge branch 'for-next/core' into for-kernelci
> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=135804fe680000
> kernel config: https://syzkaller.appspot.com/x/.config?x=f27cd6e68911e026
> dashboard link: https://syzkaller.appspot.com/bug?extid=6aa88a2d31fbec170f8b
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d48d09680000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13498275680000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/045554f2bee6/disk-c295ba49.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ba2705f8a872/vmlinux-c295ba49.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e36242e95b79/Image-c295ba49.gz.xz
> mounted in repro #1: https://storage.googleapis.com/syzbot-assets/39a4eecc45c3/mount_0.gz
> mounted in repro #2: https://storage.googleapis.com/syzbot-assets/3a9106a526c9/mount_1.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
>
> BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
#syz invalid
This is a frequent warning, can be worked around by increasing
CONFIG_LOCKDEP_CHAINS_BITS in config (18 could be a good value but may
still not be enough).