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kernel BUG in bch2_btree_node_iter_init

Status: upstream: reported C repro on 2025/02/02 22:30
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+7b8a2c442d5a4859b680@syzkaller.appspotmail.com
First crash: 57d, last: 14d
Cause bisection: introduced by (bisect log) :
commit 14152654805256d760315ec24e414363bfa19a06
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Mon Nov 25 05:21:27 2024 +0000

  bcachefs: Bad btree roots are now autofix

Crash: BUG: unable to handle kernel NULL pointer dereference in atime_needs_update (log)
Repro: syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_btree_node_iter_init 0 (1) 2025/02/02 22:30
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/03/28 08:38 15m retest repro upstream error
2025/03/28 08:38 15m retest repro upstream error
2025/03/28 08:38 15m retest repro upstream error
2025/03/28 08:38 15m retest repro upstream error
2025/03/28 08:38 14m retest repro upstream error

Sample crash report:
bcachefs (loop0): Ratelimiting new instances of previous error
 done
bcachefs (loop0): going read-write
bcachefs (loop0): journal_replay...
------------[ cut here ]------------
kernel BUG at fs/bcachefs/bset.c:1308!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5309 Comm: syz-executor423 Not tainted 6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:bch2_btree_node_iter_init+0x4252/0x4280 fs/bcachefs/bset.c:1308
Code: 84 a7 7b fd 90 0f 0b e8 7c a7 7b fd 90 0f 0b e8 74 a7 7b fd 90 0f 0b e8 4c 0c c2 07 e8 67 a7 7b fd 90 0f 0b e8 5f a7 7b fd 90 <0f> 0b e8 57 a7 7b fd 90 0f 0b e8 4f a7 7b fd 90 0f 0b e8 47 a7 7b
RSP: 0018:ffffc9000d40e7a0 EFLAGS: 00010293
RAX: ffffffff844610e1 RBX: 0203010100000000 RCX: ffff88801fa88000
RDX: 0000000000000000 RSI: 0203010100000000 RDI: 0000000000000000
RBP: ffffc9000d40ea10 R08: ffffffff8445d281 R09: 0000000000000000
R10: ffffc9000d40e930 R11: fffff52001a81d29 R12: ffff888045760040
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  000055558ab90380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586f103f0b8 CR3: 0000000043fda000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __btree_path_level_init fs/bcachefs/btree_iter.c:617 [inline]
 bch2_btree_path_level_init+0x4d2/0x9f0 fs/bcachefs/btree_iter.c:637
 btree_path_lock_root fs/bcachefs/btree_iter.c:787 [inline]
 bch2_btree_path_traverse_one+0x108b/0x2930 fs/bcachefs/btree_iter.c:1203
 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:249 [inline]
 bch2_btree_iter_traverse+0x6fa/0xce0 fs/bcachefs/btree_iter.c:1913
 bch2_journal_replay_key+0x259/0xeb0 fs/bcachefs/recovery.c:264
 bch2_journal_replay+0x1a46/0x2b10 fs/bcachefs/recovery.c:373
 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226
 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:291
 bch2_fs_recovery+0x265a/0x3de0 fs/bcachefs/recovery.c:936
 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041
 bch2_fs_get_tree+0xdb7/0x17a0 fs/bcachefs/fs.c:2203
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc35c659eaa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeb96ed7d8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffeb96ed7f0 RCX: 00007fc35c659eaa
RDX: 00004000000058c0 RSI: 0000400000000140 RDI: 00007ffeb96ed7f0
RBP: 0000400000000140 R08: 00007ffeb96ed830 R09: 000000000000590c
R10: 0000000000010000 R11: 0000000000000282 R12: 00004000000058c0
R13: 00007ffeb96ed830 R14: 0000000000000003 R15: 0000000000010000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_node_iter_init+0x4252/0x4280 fs/bcachefs/bset.c:1308
Code: 84 a7 7b fd 90 0f 0b e8 7c a7 7b fd 90 0f 0b e8 74 a7 7b fd 90 0f 0b e8 4c 0c c2 07 e8 67 a7 7b fd 90 0f 0b e8 5f a7 7b fd 90 <0f> 0b e8 57 a7 7b fd 90 0f 0b e8 4f a7 7b fd 90 0f 0b e8 47 a7 7b
RSP: 0018:ffffc9000d40e7a0 EFLAGS: 00010293
RAX: ffffffff844610e1 RBX: 0203010100000000 RCX: ffff88801fa88000
RDX: 0000000000000000 RSI: 0203010100000000 RDI: 0000000000000000
RBP: ffffc9000d40ea10 R08: ffffffff8445d281 R09: 0000000000000000
R10: ffffc9000d40e930 R11: fffff52001a81d29 R12: ffff888045760040
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  000055558ab90380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586f103f0b8 CR3: 0000000043fda000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (166):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/15 08:53 upstream 04f41cbf03ec 40a34ec9 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/02/05 21:59 upstream 92514ef226f5 577d049b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/01/31 21:32 upstream 69e858e0b8b2 aa47157c .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/02/19 09:29 upstream 6537cfb395f3 9a14138f .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_btree_node_iter_init
2025/02/01 11:48 upstream 69b8923f5003 aa47157c .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_btree_node_iter_init
2025/02/15 10:26 upstream 04f41cbf03ec 40a34ec9 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/02/13 02:14 upstream 4dc1d1bec898 2afad16e .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/14 08:09 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/14 06:42 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/14 02:17 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/14 00:49 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 15:46 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 15:38 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 14:31 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 13:28 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 11:53 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 09:40 upstream b7f94fcf5546 44be8b44 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/13 01:51 upstream 0fed89a961ea 1a5d9317 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 23:02 upstream 0fed89a961ea 1a5d9317 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 18:20 upstream 0fed89a961ea ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 16:12 upstream 0fed89a961ea ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 14:44 upstream 0fed89a961ea ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 08:38 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 06:44 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 05:25 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/12 00:50 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 17:13 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 16:00 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 12:21 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 10:36 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 09:28 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 05:08 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/11 03:20 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 21:25 upstream 80e54e84911a 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 20:17 upstream 80e54e84911a 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 17:25 upstream 80e54e84911a 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 16:11 upstream 80e54e84911a 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 07:33 upstream 80e54e84911a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/10 00:13 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 22:37 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 17:24 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 16:04 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 12:29 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 08:52 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 07:44 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/09 06:05 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 20:10 upstream 2a520073e74f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 17:18 upstream 2a520073e74f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 16:01 upstream 2a520073e74f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 13:49 upstream 21e4543a2e2f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 09:16 upstream 21e4543a2e2f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/08 02:51 upstream 21e4543a2e2f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
2025/03/07 19:48 upstream 00a7d39898c8 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_node_iter_init
* Struck through repros no longer work on HEAD.