linux-kernel - [syzbot] [bcachefs?] kernel BUG in bch2_journal_res

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Message-ID: <671b3f3d.050a0220.2eb763.00d3.GAE@google.com>
Date: Thu, 24 Oct 2024 23:48:29 -0700
From: syzbot <syzbot+859300e61790263514a3@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] kernel BUG in bch2_journal_res_get (2)

Hello,

syzbot found the following issue on:

HEAD commit:    526116b79e8c KVM: arm64: Shave a few bytes from the EL2 id..
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=17e78c30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e39b0b4b1ace5bc0
dashboard link: https://syzkaller.appspot.com/bug?extid=859300e61790263514a3
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=164488a7980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17052a5f980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2f7b2b08fdad/disk-526116b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b69595b63015/vmlinux-526116b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/39fd415ada60/Image-526116b7.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/bc1232192aa1/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+859300e61790263514a3@...kaller.appspotmail.com

bcachefs (loop0): bch2_write_super(): fatal error  loop0: Superblock write was silently dropped! (seq 0 expected 53)
bcachefs (loop0): fatal error - emergency read only
------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal.h:375!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.12.0-rc4-syzkaller-g526116b79e8c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: btree_update btree_interior_update_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bch2_journal_res_get+0x6fc/0x710 fs/bcachefs/journal.h:375
lr : bch2_journal_res_get+0x6fc/0x710 fs/bcachefs/journal.h:375
sp : ffff8000978b7560
x29: ffff8000978b7650 x28: 000000000000000e x27: ffff0000e0aca500
x26: 1fffe0001b9a901a x25: dfff800000000000 x24: 1ffff00012f16ebc
x23: 0000000000000044 x22: ffff8000978b75e0 x21: ffff0000e0aca500
x20: 0000000000000004 x19: ffff0000dcd480d0 x18: ffff8000978b6740
x17: 0000000000000000 x16: ffff80008b3d3d08 x15: ffff700012f16e9c
x14: 1ffff00012f16e9c x13: 0000000000000004 x12: ffffffffffffffff
x11: ffff700012f16e9c x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c19dbc80 x7 : 0000000000000000 x6 : 0000000000000105
x5 : ffff8000978b7308 x4 : 0000000000000000 x3 : 000000000000000e
x2 : 0000000000000044 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 bch2_journal_res_get+0x6fc/0x710 fs/bcachefs/journal.h:375 (P)
 bch2_journal_res_get+0x6fc/0x710 fs/bcachefs/journal.h:375 (L)
 bch2_trans_journal_res_get fs/bcachefs/btree_trans_commit.c:350 [inline]
 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:668 [inline]
 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:900 [inline]
 __bch2_trans_commit+0x2a00/0x6604 fs/bcachefs/btree_trans_commit.c:1121
 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:728 [inline]
 btree_interior_update_work+0xd40/0x1e00 fs/bcachefs/btree_update_interior.c:866
 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
Code: 955b1ed6 97749ac7 d4210000 97749ac5 (d4210000) 
---[ end trace 0000000000000000 ]---


---
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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If the report is already addressed, let syzbot know by replying with:
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