syzbot


kernel BUG in __bch2_trans_get

Status: upstream: reported C repro on 2025/09/07 13:59
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+3a42e4989f9047772c6d@syzkaller.appspotmail.com
First crash: 52d, last: 10d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in __bch2_trans_get 0 (2) 2025/09/19 06:16
Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/10/15 09:17 19m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log

Sample crash report:
bcachefs (loop0): /file3 offset 0: data_read_io_err
  u64s 7 type extent 1073741828:24:U32_MAX len 24 ver 0: durability: 1 crc: c_size 24 size 24 offset 0 nonce 0 csum crc32c 0:0  compress none ptr: 0:34:8 gen 0
bcachefs (loop0): /file3 offset 0: data read error: data_read_io_err
bcachefs (loop0): /file3 offset 0: data read error, data_read_io_err
  u64s 7 type extent 1073741828:24:U32_MAX len 24 ver 0: durability: 1 crc: c_size 24 size 24 offset 0 nonce 0 csum crc32c 0:0  compress none ptr: 0:34:8 gen 0
  loop0 io error
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_iter.c:3462!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 14 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: events_unbound bch2_rbio_retry
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __bch2_trans_get+0x9ac/0x9d4 fs/bcachefs/btree_iter.c:3460
lr : __bch2_trans_get+0x9ac/0x9d4 fs/bcachefs/btree_iter.c:3460
sp : ffff800097c674a0
x29: ffff800097c674a0 x28: 1fffe0001d620840 x27: ffff0000c1a01e80
x26: dfff800000000000 x25: 0000000000000006 x24: ffff0000db4541d8
x23: 000000000000000e x22: ffff0000eb104200 x21: 0000000000000025
x20: ffff0000eb100000 x19: ffff0000d2510000 x18: 00000000ffffffff
x17: ffff800093529000 x16: ffff80008b01d6e0 x15: 0000000000000001
x14: 1ffff00012f8ce34 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700012f8ce35 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c1a01e80 x7 : ffff8000828bb454 x6 : 0000000000000000
x5 : ffff8000936f2db0 x4 : 0000000000000008 x3 : ffff800080522fb4
x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000000
Call trace:
 __bch2_trans_get+0x9ac/0x9d4 fs/bcachefs/btree_iter.c:3460 (P)
 bch2_rbio_retry+0x17c/0xd44 fs/bcachefs/io_read.c:594
 bch2_rbio_punt fs/bcachefs/io_read.c:411 [inline]
 bch2_rbio_error+0x24c/0x354 fs/bcachefs/io_read.c:686
 bch2_read_endio+0x510/0x908 fs/bcachefs/io_read.c:-1
 bio_endio+0x858/0x894 block/bio.c:1651
 bch2_rbio_done fs/bcachefs/io_read.c:464 [inline]
 bch2_rbio_retry+0x86c/0xd44 fs/bcachefs/io_read.c:667
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
Code: 17ffff25 9779d56a 17fffe9f 9779d568 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/19 06:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c9d61056440c e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 kernel BUG in __bch2_trans_get
2025/09/30 07:07 upstream 449c2b302c8e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_get
2025/09/29 11:09 upstream e5f0a698b34e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_get
2025/09/23 02:42 upstream cec1e6e5d1ab 0ac7291c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_get
2025/09/04 23:25 upstream 08b06c30a445 d291dd2d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_get
2025/09/03 13:51 upstream e6b9dce0aeeb 96a211bc .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_get
2025/09/19 05:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c9d61056440c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in __bch2_trans_get
* Struck through repros no longer work on HEAD.