linux-kernel - [syzbot] [bcachefs?] kernel BUG in bch2_run_recovery

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Message-ID: <671a8834.050a0220.2eb763.00c5.GAE@google.com>
Date: Thu, 24 Oct 2024 10:47:32 -0700
From: syzbot <syzbot+a27c3aaa3640dd3e1dfb@...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_run_recovery_pass

Hello,

syzbot found the following issue on:

HEAD commit:    715ca9dd687f Merge tag 'io_uring-6.12-20241019' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15afa0a7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=16e543edc81a3008
dashboard link: https://syzkaller.appspot.com/bug?extid=a27c3aaa3640dd3e1dfb
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a8ec87980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14b7425f980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-715ca9dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ba436e2363b6/vmlinux-715ca9dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3ac78a7a1a30/bzImage-715ca9dd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/44b65c0cea47/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a27c3aaa3640dd3e1dfb@...kaller.appspotmail.com

bcachefs (loop0): check_lrus... done
bcachefs (loop0): check_btree_backpointers... done
bcachefs (loop0): check_backpointers_to_extents...
------------[ cut here ]------------
kernel BUG at fs/bcachefs/bkey_types.h:210!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5098 Comm: syz-executor177 Not tainted 6.12.0-rc3-syzkaller-00420-g715ca9dd687f #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:bkey_s_c_to_backpointer fs/bcachefs/bkey_types.h:210 [inline]
RIP: 0010:bch2_check_backpointers_to_extents_pass fs/bcachefs/backpointers.c:1003 [inline]
RIP: 0010:bch2_check_backpointers_to_extents+0x240a/0x2430 fs/bcachefs/backpointers.c:1049
Code: 48 8b 4c 24 38 80 e1 07 38 c1 0f 8c b7 dd ff ff be 18 00 00 00 48 8b 7c 24 38 e8 11 7e ee fd e9 a3 dd ff ff e8 27 b8 84 fd 90 <0f> 0b e8 1f b8 84 fd 90 0f 0b e8 f7 56 b6 07 e8 12 b8 84 fd 90 0f
RSP: 0018:ffffc90002d9ed80 EFLAGS: 00010293
RAX: ffffffff84102fd9 RBX: ffff888041da01d0 RCX: ffff8880003e2440
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 000000000000001c
RBP: ffffc90002d9f488 R08: ffffffff84101b4e R09: 0000000000000000
R10: ffffc90002d9e780 R11: fffff520005b3cfd R12: 0000000000000003
R13: ffffc90002d9f280 R14: dffffc0000000000 R15: ffff8880401a8000
FS:  000055556e26c380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffda68deef8 CR3: 000000004091a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:185
 bch2_run_recovery_passes+0x387/0x870 fs/bcachefs/recovery_passes.c:232
 bch2_fs_recovery+0x25cc/0x39c0 fs/bcachefs/recovery.c:862
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1036
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2174
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 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: 0033:0x7f1f62c028fa
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:00007ffe477ec068 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe477ec080 RCX: 00007f1f62c028fa
RDX: 00000000200058c0 RSI: 0000000020001040 RDI: 00007ffe477ec080
RBP: 0000000000000004 R08: 00007ffe477ec0c0 R09: 002c647261637350
R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000
R13: 00007ffe477ec0c0 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bkey_s_c_to_backpointer fs/bcachefs/bkey_types.h:210 [inline]
RIP: 0010:bch2_check_backpointers_to_extents_pass fs/bcachefs/backpointers.c:1003 [inline]
RIP: 0010:bch2_check_backpointers_to_extents+0x240a/0x2430 fs/bcachefs/backpointers.c:1049
Code: 48 8b 4c 24 38 80 e1 07 38 c1 0f 8c b7 dd ff ff be 18 00 00 00 48 8b 7c 24 38 e8 11 7e ee fd e9 a3 dd ff ff e8 27 b8 84 fd 90 <0f> 0b e8 1f b8 84 fd 90 0f 0b e8 f7 56 b6 07 e8 12 b8 84 fd 90 0f
RSP: 0018:ffffc90002d9ed80 EFLAGS: 00010293
RAX: ffffffff84102fd9 RBX: ffff888041da01d0 RCX: ffff8880003e2440
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 000000000000001c
RBP: ffffc90002d9f488 R08: ffffffff84101b4e R09: 0000000000000000
R10: ffffc90002d9e780 R11: fffff520005b3cfd R12: 0000000000000003
R13: ffffc90002d9f280 R14: dffffc0000000000 R15: ffff8880401a8000
FS:  000055556e26c380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffda68deef8 CR3: 000000004091a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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