linux-kernel - Re: [syzbot] [bcachefs?] INFO: task hung in bch2_journal_reclaim

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Message-ID: <671c7b8c.050a0220.2fdf0c.0222.GAE@google.com>
Date: Fri, 25 Oct 2024 22:18:04 -0700
From: syzbot <syzbot+820dc3b465c69f766a57@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] INFO: task hung in bch2_journal_reclaim_thread
 (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in bch2_fs_btree_cache_exit

bcachefs (loop0): flushing journal and stopping allocators complete, journal seq 10
bcachefs (loop0): unshutdown complete, journal seq 11
bcachefs (loop0): done going read-only, filesystem not clean
bcachefs (loop0): shutdown complete
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_cache.c:594!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5815 Comm: syz-executor Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bch2_fs_btree_cache_exit+0x1124/0x1130 fs/bcachefs/btree_cache.c:593
Code: fd 90 0f 0b e8 6d 46 84 fd 90 0f 0b e8 65 46 84 fd 90 0f 0b e8 5d 46 84 fd 90 0f 0b e8 55 46 84 fd 90 0f 0b e8 4d 46 84 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003717c40 EFLAGS: 00010293
RAX: ffffffff8410a3d3 RBX: 0000000000000002 RCX: ffff88802d6a9e00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff11006350f16 R08: ffffffff84109a77 R09: 1ffff1100c0e03b6
R10: dffffc0000000000 R11: ffffed100c0e03b7 R12: ffff888060701c78
R13: ffff888060700000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055555b937500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3b2944000 CR3: 000000002888e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_fs_free fs/bcachefs/super.c:556 [inline]
 bch2_fs_release+0x20e/0x7d0 fs/bcachefs/super.c:610
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe3bbb7f327
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd2b5b2c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe3bbb7f327
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd2b5b2d00
RBP: 00007ffd2b5b2d00 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd2b5b3d80
R13: 00007fe3bbbf0134 R14: 0000000000045d95 R15: 00007ffd2b5b3dc0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_fs_btree_cache_exit+0x1124/0x1130 fs/bcachefs/btree_cache.c:593
Code: fd 90 0f 0b e8 6d 46 84 fd 90 0f 0b e8 65 46 84 fd 90 0f 0b e8 5d 46 84 fd 90 0f 0b e8 55 46 84 fd 90 0f 0b e8 4d 46 84 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003717c40 EFLAGS: 00010293
RAX: ffffffff8410a3d3 RBX: 0000000000000002 RCX: ffff88802d6a9e00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff11006350f16 R08: ffffffff84109a77 R09: 1ffff1100c0e03b6
R10: dffffc0000000000 R11: ffffed100c0e03b7 R12: ffff888060701c78
R13: ffff888060700000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055555b937500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000d98000 CR3: 000000002888e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         850925a8 Merge tag '9p-for-6.12-rc5' of https://github..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=161704a7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41330fd2db03893d
dashboard link: https://syzkaller.appspot.com/bug?extid=820dc3b465c69f766a57
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=113eaebb980000