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kernel BUG in __bch2_bkey_unpack_key

Status: upstream: reported C repro on 2025/05/27 15:15
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+d78b3c996e2381acd902@syzkaller.appspotmail.com
First crash: 3d03h, last: 3h10m
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in __bch2_bkey_unpack_key 0 (1) 2025/05/27 15:15

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/bkey.c:272!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5306 Comm: read_btree_node Not tainted 6.15.0-syzkaller-01599-gddddf9d64f73 #0 PREEMPT(full) 
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_bkey_unpack_key+0xdeb/0xe10 fs/bcachefs/bkey.c:272
Code: b2 da 00 e9 f3 f9 ff ff e8 a2 10 aa fd 48 c7 c7 a0 7b 55 8e 48 89 ee 4c 89 f2 e8 20 b2 da 00 e9 2e fb ff ff e8 86 10 aa fd 90 <0f> 0b e8 7e 10 aa fd 90 0f 0b e8 76 10 aa fd 90 0f 0b e8 6e 10 aa
RSP: 0018:ffffc9000d3e6ab8 EFLAGS: 00010293
RAX: ffffffff841519da RBX: 0000000000000003 RCX: ffff888000ad8000
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006
RBP: 0000000000000005 R08: ffffc9000d3e6d4f R09: 0000000000000000
R10: ffffc9000d3e6d30 R11: fffff52001a7cdaa R12: ffffc9000d3e6d30
R13: ffff888046dc1028 R14: ffff88803ee140c1 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d6b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ce47cf57d0 CR3: 0000000011f33000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_bkey_compat+0x4db/0xbd0 fs/bcachefs/bkey_methods.c:480
 bch2_bkey_compat fs/bcachefs/bkey_methods.h:134 [inline]
 validate_bset_keys+0x6c1/0x1390 fs/bcachefs/btree_io.c:983
 bch2_btree_node_read_done+0x18c8/0x4f60 fs/bcachefs/btree_io.c:1211
 btree_node_read_work+0x426/0xe30 fs/bcachefs/btree_io.c:1400
 bch2_btree_node_read+0x887/0x29f0 fs/bcachefs/btree_io.c:-1
 bch2_btree_node_fill+0xd12/0x14f0 fs/bcachefs/btree_cache.c:994
 bch2_btree_node_get_noiter+0xa2c/0x1000 fs/bcachefs/btree_cache.c:1261
 found_btree_node_is_readable fs/bcachefs/btree_node_scan.c:85 [inline]
 try_read_btree_node fs/bcachefs/btree_node_scan.c:220 [inline]
 read_btree_nodes_worker+0x1319/0x1e20 fs/bcachefs/btree_node_scan.c:269
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bch2_bkey_unpack_key+0xdeb/0xe10 fs/bcachefs/bkey.c:272
Code: b2 da 00 e9 f3 f9 ff ff e8 a2 10 aa fd 48 c7 c7 a0 7b 55 8e 48 89 ee 4c 89 f2 e8 20 b2 da 00 e9 2e fb ff ff e8 86 10 aa fd 90 <0f> 0b e8 7e 10 aa fd 90 0f 0b e8 76 10 aa fd 90 0f 0b e8 6e 10 aa
RSP: 0018:ffffc9000d3e6ab8 EFLAGS: 00010293
RAX: ffffffff841519da RBX: 0000000000000003 RCX: ffff888000ad8000
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006
RBP: 0000000000000005 R08: ffffc9000d3e6d4f R09: 0000000000000000
R10: ffffc9000d3e6d30 R11: fffff52001a7cdaa R12: ffffc9000d3e6d30
R13: ffff888046dc1028 R14: ffff88803ee140c1 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d6b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ce47cf57d0 CR3: 000000003f92f000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/27 07:39 upstream ddddf9d64f73 874a1386 .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_bkey_unpack_key
2025/05/30 07:15 upstream e0797d3b91de 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/30 00:24 upstream e0797d3b91de 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/29 22:26 upstream e0797d3b91de 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/29 11:34 upstream 90b83efa6701 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/29 04:45 upstream feacb1774bd5 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/28 21:23 upstream feacb1774bd5 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/28 00:22 upstream 914873bc7df9 874a1386 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
2025/05/27 07:17 upstream ddddf9d64f73 874a1386 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_bkey_unpack_key
* Struck through repros no longer work on HEAD.