syzbot


WARNING in btrfs_create_pending_block_groups (2)

Status: upstream: reported C repro on 2024/09/19 23:50
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+b0643a1387dac0572b27@syzkaller.appspotmail.com
First crash: 26d, last: 10d
Cause bisection: introduced by (bisect log) :
commit b2f78e88052bc0bee56bbf646d245fcfb431a873
Author: David Sterba <dsterba@suse.com>
Date: Thu Jul 22 18:54:37 2021 +0000

  btrfs: allow degenerate raid0/raid10

Crash: WARNING in btrfs_create_pending_block_groups (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] WARNING in btrfs_create_pending_block_groups (2) 0 (1) 2024/09/19 23:50
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in btrfs_create_pending_block_groups origin:upstream missing-backport C inconclusive 5 164d 426d 0/3 upstream: reported C repro on 2023/08/13 16:14
upstream WARNING in btrfs_create_pending_block_groups btrfs C error done 64 280d 684d 0/28 auto-obsoleted due to no activity on 2024/05/26 09:44
linux-5.15 WARNING in btrfs_create_pending_block_groups origin:upstream missing-backport C done 15 9d08h 472d 0/3 upstream: reported C repro on 2023/06/28 06:17
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/10/02 11:21 16m retest repro upstream report log

Sample crash report:
BTRFS info (device loop0): balance: start -s
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 1 PID: 5219 at fs/btrfs/block-group.c:2752 btrfs_create_pending_block_groups+0x14f9/0x1710 fs/btrfs/block-group.c:2752
Modules linked in:
CPU: 1 UID: 0 PID: 5219 Comm: syz-executor144 Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:btrfs_create_pending_block_groups+0x14f9/0x1710 fs/btrfs/block-group.c:2752
Code: c0 fd 4c 89 f7 be 03 00 00 00 e8 d2 58 d7 00 e9 86 f9 ff ff e8 a8 eb c0 fd 90 48 c7 c7 00 47 2e 8c 44 89 f6 e8 38 0f 83 fd 90 <0f> 0b 90 90 e9 7b fe ff ff e8 89 eb c0 fd 90 48 c7 c7 00 47 2e 8c
RSP: 0018:ffffc900034776a0 EFLAGS: 00010246
RAX: 7f15963a9c8f3600 RBX: ffff88807c9b4001 RCX: ffff88802be1da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003477960 R08: ffffffff8155b292 R09: fffffbfff1cba0e0
R10: dffffc0000000000 R11: fffffbfff1cba0e0 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000ffffffe4 R15: ffff8880323c49c0
FS:  00005555919dc380(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46f00c80f8 CR3: 00000000253ae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x150/0x630 fs/btrfs/transaction.c:1066
 btrfs_inc_block_group_ro+0x648/0x700 fs/btrfs/block-group.c:3043
 btrfs_relocate_block_group+0x440/0xd90 fs/btrfs/relocation.c:4090
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3374
 __btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4158
 btrfs_balance+0xbdc/0x10c0 fs/btrfs/volumes.c:4535
 btrfs_ioctl_balance+0x496/0x7d0 fs/btrfs/ioctl.c:3675
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7f46f004bae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffcdde70d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f46f004bae9
RDX: 0000000020000040 RSI: 00000000c4009420 RDI: 0000000000000003
RBP: 00007f46f00c45f0 R08: 00005555919dd4c0 R09: 00005555919dd4c0
R10: 0000000000005598 R11: 0000000000000246 R12: 00007ffcdde70da0
R13: 00007ffcdde70fc8 R14: 431bde82d7b634db R15: 00007f46f009401d
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/15 23:46 upstream d42f7708e27c 08d8a733 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in btrfs_create_pending_block_groups
2024/09/18 11:13 upstream 2f27fce67173 c673ca06 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in btrfs_create_pending_block_groups
* Struck through repros no longer work on HEAD.