linux-kernel - [syzbot] [btrfs?] BUG: MAX_LOCKDEP_CHAIN

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Message-ID: <0000000000008f55e4062036c827@google.com>
Date: Wed, 21 Aug 2024 12:45:25 -0700
From: syzbot <syzbot+dfb6eff2a68b42d557d3@...kaller.appspotmail.com>
To: clm@...com, dsterba@...e.com, josef@...icpanda.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [btrfs?] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! (6)

Hello,

syzbot found the following issue on:

HEAD commit:    5c43d43bad35 Merge branches 'for-next/acpi', 'for-next/mis..
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=13471a05980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c91f83ae59feaa1f
dashboard link: https://syzkaller.appspot.com/bug?extid=dfb6eff2a68b42d557d3
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=10efded5980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e94093980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cc2dd4be620e/disk-5c43d43b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/81d40d99ddbf/vmlinux-5c43d43b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bc6aed0f2bc5/Image-5c43d43b.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d55321fffedc/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dfb6eff2a68b42d557d3@...kaller.appspotmail.com

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

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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