linux-kernel - Re: [syzbot] [bcachefs?] WARNING in bch2_fs_read_write

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Date: Fri, 14 Jun 2024 19:50:02 -0700
From: syzbot <syzbot+4366624c0b5aac4906cf@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] WARNING in bch2_fs_read_write_early

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!

BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 2 PID: 5280 Comm: kworker/2:3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7-dirty #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bcachefs_write_ref bch2_delete_dead_snapshots_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 add_chain_cache kernel/locking/lockdep.c:3735 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3816 [inline]
 validate_chain kernel/locking/lockdep.c:3837 [inline]
 __lock_acquire+0x2ea6/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 do_write_seqcount_begin_nested include/linux/seqlock.h:469 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:495 [inline]
 psi_account_irqtime+0x2a3/0x510 kernel/sched/psi.c:1016
 update_rq_clock_task kernel/sched/core.c:726 [inline]
 update_rq_clock kernel/sched/core.c:770 [inline]
 update_rq_clock+0x250/0xb30 kernel/sched/core.c:751
 ttwu_queue kernel/sched/core.c:4056 [inline]
 try_to_wake_up+0x56a/0x13e0 kernel/sched/core.c:4378
 kick_pool+0x2a0/0x7a0 kernel/workqueue.c:1279
 __queue_work+0x94d/0x1020 kernel/workqueue.c:2360
 queue_work_on+0x11a/0x140 kernel/workqueue.c:2410
 queue_work include/linux/workqueue.h:621 [inline]
 __bch2_btree_node_write+0x1fc1/0x2d60 fs/bcachefs/btree_io.c:2232
 bch2_btree_node_write+0x127/0x2f0 fs/bcachefs/btree_io.c:2307
 btree_split+0x1087/0x3010 fs/bcachefs/btree_update_interior.c:1706
 bch2_btree_split_leaf+0x108/0x770 fs/bcachefs/btree_update_interior.c:1857
 bch2_trans_commit_error+0x327/0xd00 fs/bcachefs/btree_trans_commit.c:918
 __bch2_trans_commit+0x4eb1/0x7ad0 fs/bcachefs/btree_trans_commit.c:1138
 bch2_trans_commit fs/bcachefs/btree_update.h:170 [inline]
 bch2_delete_dead_snapshots+0x1b22/0x4e70 fs/bcachefs/snapshot.c:1619
 bch2_delete_dead_snapshots_work+0x20/0x160 fs/bcachefs/snapshot.c:1692
 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
bcachefs (loop0): bch2_delete_dead_snapshots(): error deleting keys from dying snapshots erofs_trans_commit
bcachefs (loop0): bch2_delete_dead_snapshots(): error erofs_trans_commit
bcachefs (loop0): bch2_delete_dead_snapshots(): error deleting keys from dying snapshots erofs_trans_commit
bcachefs (loop0): bch2_delete_dead_snapshots(): error erofs_trans_commit
bcachefs (loop0): bch2_delete_dead_snapshots(): error deleting snapshot 4294967295 ENOENT_bkey_type_mismatch
bcachefs (loop0): bch2_delete_dead_snapshots(): error ENOENT_bkey_type_mismatch
bcachefs (loop0): bch2_delete_dead_snapshots(): error deleting snapshot 4294967295 ENOENT_bkey_type_mismatch
bcachefs (loop0): bch2_delete_dead_snapshots(): error ENOENT_bkey_type_mismatch

Tested on:

commit:         2ccbdf43 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16e190b6980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f
dashboard link: https://syzkaller.appspot.com/bug?extid=4366624c0b5aac4906cf
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=122fbb36980000