On 2023/7/31 13:11, Qu Wenruo wrote:
On 2023/7/31 01:07, syzbot wrote:
syzbot has found a reproducer for the following issue on:
HEAD commit: d31e3792919e Merge tag '6.5-rc3-smb3-client-fixes' of
git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17afd745a80000
kernel config:
https://syzkaller.appspot.com/x/.config?x=9d670a4f6850b6f4
dashboard link:
https://syzkaller.appspot.com/bug?extid=ae97a827ae1c3336bbb4
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils
for Debian) 2.40
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=15278939a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14dd3f31a80000
Downloadable assets:
disk image (non-bootable):
https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d31e3792.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/c6c2342933c9/vmlinux-d31e3792.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/42df60b42886/bzImage-d31e3792.xz
mounted in repro:
https://storage.googleapis.com/syzbot-assets/78ffd1ddff6c/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the
commit:
Reported-by: syzbot+ae97a827ae1c3336bbb4@xxxxxxxxxxxxxxxxxxxxxxxxx
BTRFS info (device loop1): relocating block group 5242880 flags
data|metadata
assertion failed: root->reloc_root == reloc_root, in
fs/btrfs/relocation.c:1919
------------[ cut here ]------------
kernel BUG at fs/btrfs/relocation.c:1919!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12638 Comm: syz-executor311 Not tainted
6.5.0-rc3-syzkaller-00297-gd31e3792919e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:prepare_to_merge+0x9cc/0xcd0 fs/btrfs/relocation.c:1919
Code: c5 e9 81 fd ff ff e8 e3 59 00 fe b9 7f 07 00 00 48 c7 c2 40 d9
b6 8a 48 c7 c6 20 e6 b6 8a 48 c7 c7 a0 da b6 8a e8 54 bc e3 fd <0f> 0b
4c 8b 7c 24 38 48 8b 5c 24 10 44 8b 6c 24 0c e8 ae 59 00 fe
RSP: 0018:ffffc90023e176d0 EFLAGS: 00010282
RAX: 000000000000004f RBX: ffff88801e898560 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81698120 RDI: 0000000000000005
RBP: ffff88801e898558 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 6f69747265737361 R12: dffffc0000000000
R13: ffff88801e898000 R14: ffff88802d944000 R15: ffff888017616618
FS: 00007fb31aba26c0(0000) GS:ffff88806b600000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb31ac3a758 CR3: 000000002e1dc000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
relocate_block_group+0x8d1/0xe70 fs/btrfs/relocation.c:3749
btrfs_relocate_block_group+0x714/0xd90 fs/btrfs/relocation.c:4087
btrfs_relocate_chunk+0x143/0x440 fs/btrfs/volumes.c:3283
__btrfs_balance fs/btrfs/volumes.c:4018 [inline]
btrfs_balance+0x20fc/0x3ef0 fs/btrfs/volumes.c:4395
btrfs_ioctl_balance fs/btrfs/ioctl.c:3604 [inline]
btrfs_ioctl+0x1362/0x5cf0 fs/btrfs/ioctl.c:4637
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb31abe6e49
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb31aba2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb31ac73728 RCX: 00007fb31abe6e49
RDX: 00000000200003c0 RSI: 00000000c4009420 RDI: 0000000000000005
RBP: 00007fb31ac73720 R08: 00007fb31aba26c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb31ac7372c
R13: 0000000000000006 R14: 00007ffe768d5660 R15: 00007ffe768d5748
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:prepare_to_merge+0x9cc/0xcd0 fs/btrfs/relocation.c:1919
Code: c5 e9 81 fd ff ff e8 e3 59 00 fe b9 7f 07 00 00 48 c7 c2 40 d9
b6 8a 48 c7 c6 20 e6 b6 8a 48 c7 c7 a0 da b6 8a e8 54 bc e3 fd <0f> 0b
4c 8b 7c 24 38 48 8b 5c 24 10 44 8b 6c 24 0c e8 ae 59 00 fe
RSP: 0018:ffffc90023e176d0 EFLAGS: 00010282
RAX: 000000000000004f RBX: ffff88801e898560 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81698120 RDI: 0000000000000005
RBP: ffff88801e898558 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 6f69747265737361 R12: dffffc0000000000
R13: ffff88801e898000 R14: ffff88802d944000 R15: ffff888017616618
FS: 00007fb31aba26c0(0000) GS:ffff88806b600000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb31ac3a758 CR3: 000000002e1dc000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
I failed to reproduce it locally, although it's on David's misc-next.
# syz test: git://github.com/kdave/btrfs-devel.git misc-next
# syz test: git://github.com/adam900710/linux.git graceful_reloc_mismatch
Thanks,
Qu
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
