linux-kernel - [syzbot] [bcachefs?] kernel BUG in bch2_btree_pos_to

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Message-ID: <6740d108.050a0220.3c9d61.0196.GAE@google.com>
Date: Fri, 22 Nov 2024 10:44:24 -0800
From: syzbot <syzbot+1f202d4da221ec6ebf8e@...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_btree_pos_to_text (2)

Hello,

syzbot found the following issue on:

HEAD commit:    158f238aa69d Merge tag 'for-linus-6.13-rc1-tag' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13798b78580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6e547da255e4eefa
dashboard link: https://syzkaller.appspot.com/bug?extid=1f202d4da221ec6ebf8e
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=12e386c0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1105875f980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-158f238a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0a823971fc99/vmlinux-158f238a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e215e05844b2/bzImage-158f238a.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b0994925a8f6/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f202d4da221ec6ebf8e@...kaller.appspotmail.com

invalid bkey u64s 5 type set 18446462598867058688:34:0 len 3072 ver 0
  size != 0: delete?, fixing
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_cache.h:131!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 Comm: read_btree_node Not tainted 6.12.0-syzkaller-00971-g158f238aa69d #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_id_root fs/bcachefs/btree_cache.h:131 [inline]
RIP: 0010:bch2_btree_pos_to_text+0x1ee/0x1f0 fs/bcachefs/btree_cache.c:1403
Code: 00 00 fc ff df e9 70 ff ff ff 89 d9 80 e1 07 38 c1 0f 8c 7a ff ff ff 48 89 df e8 fd 89 e9 fd e9 6d ff ff ff e8 c3 a1 7f fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa
RSP: 0018:ffffc9000d14f448 EFLAGS: 00010293
RAX: ffffffff8415501d RBX: 000000000000001e RCX: ffff888000c04880
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff84154f0a R09: 0000000000000000
R10: ffffc9000d14f5e0 R11: fffff52001a29ec1 R12: ffff888040420800
R13: ffff888044700000 R14: ffff888044700000 R15: ffffc9000d14f5e0
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562b097d2fd0 CR3: 0000000011e62000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btree_node_read_work+0x486/0x1260 fs/bcachefs/btree_io.c:1308
 bch2_btree_node_read+0x2433/0x2a10
 bch2_btree_node_fill+0xc75/0x12f0 fs/bcachefs/btree_cache.c:991
 bch2_btree_node_get_noiter+0x9d5/0xf70 fs/bcachefs/btree_cache.c:1260
 found_btree_node_is_readable fs/bcachefs/btree_node_scan.c:85 [inline]
 try_read_btree_node fs/bcachefs/btree_node_scan.c:193 [inline]
 read_btree_nodes_worker+0x13c5/0x2220 fs/bcachefs/btree_node_scan.c:242
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_id_root fs/bcachefs/btree_cache.h:131 [inline]
RIP: 0010:bch2_btree_pos_to_text+0x1ee/0x1f0 fs/bcachefs/btree_cache.c:1403
Code: 00 00 fc ff df e9 70 ff ff ff 89 d9 80 e1 07 38 c1 0f 8c 7a ff ff ff 48 89 df e8 fd 89 e9 fd e9 6d ff ff ff e8 c3 a1 7f fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa
RSP: 0018:ffffc9000d14f448 EFLAGS: 00010293
RAX: ffffffff8415501d RBX: 000000000000001e RCX: ffff888000c04880
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff84154f0a R09: 0000000000000000
R10: ffffc9000d14f5e0 R11: fffff52001a29ec1 R12: ffff888040420800
R13: ffff888044700000 R14: ffff888044700000 R15: ffffc9000d14f5e0
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b6646f3018 CR3: 0000000011e62000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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