Hello, syzbot found the following issue on: HEAD commit: 9221b2819b8a Add linux-next specific files for 20240503 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1582ab54980000 kernel config: https://syzkaller.appspot.com/x/.config?x=8ab537f51a6a0d98 dashboard link: https://syzkaller.appspot.com/bug?extid=bf7215c0525098e7747a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3e67dbdc3c37/disk-9221b281.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ade618fa19f8/vmlinux-9221b281.xz kernel image: https://storage.googleapis.com/syzbot-assets/df12e5073c97/bzImage-9221b281.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bf7215c0525098e7747a@xxxxxxxxxxxxxxxxxxxxxxxxx bcachefs (loop2): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=crc64,data_checksum=none,nojournal_transaction_names bcachefs (loop2): recovering from clean shutdown, journal seq 10 ------------[ cut here ]------------ kernel BUG at fs/bcachefs/backpointers.h:75! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 10734 Comm: syz-executor.2 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:bucket_pos_to_bp fs/bcachefs/backpointers.h:75 [inline] RIP: 0010:bch2_backpointer_invalid+0x9cc/0x9d0 fs/bcachefs/backpointers.c:65 Code: fc ff ff e8 f6 19 8d fd 48 c7 c7 40 7f 91 8e 48 89 de e8 87 e9 e2 00 e9 fc f7 ff ff e8 dd 19 8d fd 90 0f 0b e8 d5 19 8d fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 53 e8 RSP: 0018:ffffc900040f6600 EFLAGS: 00010246 RAX: ffffffff8408fc0b RBX: 00000000002d3cb6 RCX: 0000000000040000 RDX: ffffc9000b24a000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: 000000b4f2d90000 R08: ffffffff8408f5aa R09: 1ffffffff25f54b0 R10: dffffc0000000000 R11: fffffbfff25f54b1 R12: 1ffff9200081ed58 R13: ffffc900040f6aa0 R14: ffff8880533a00bb R15: 000000000000001b FS: 00007fa2e10d16c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001100 CR3: 0000000017ee0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bch2_btree_node_read_done+0x3e7d/0x5ed0 fs/bcachefs/btree_io.c:1234 btree_node_read_work+0x665/0x1300 fs/bcachefs/btree_io.c:1345 bch2_btree_node_read+0x2637/0x2c80 fs/bcachefs/btree_io.c:1730 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline] bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793 read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:472 bch2_fs_recovery+0x2334/0x36e0 fs/bcachefs/recovery.c:800 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1030 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2105 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2e027f42a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa2e10d0ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa2e10d0f80 RCX: 00007fa2e027f42a RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007fa2e10d0f40 RBP: 0000000020011a00 R08: 00007fa2e10d0f80 R09: 0000000002000000 R10: 0000000002000000 R11: 0000000000000202 R12: 0000000020011a40 R13: 00007fa2e10d0f40 R14: 00000000000119fd R15: 00000000200000c0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bucket_pos_to_bp fs/bcachefs/backpointers.h:75 [inline] RIP: 0010:bch2_backpointer_invalid+0x9cc/0x9d0 fs/bcachefs/backpointers.c:65 Code: fc ff ff e8 f6 19 8d fd 48 c7 c7 40 7f 91 8e 48 89 de e8 87 e9 e2 00 e9 fc f7 ff ff e8 dd 19 8d fd 90 0f 0b e8 d5 19 8d fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 53 e8 RSP: 0018:ffffc900040f6600 EFLAGS: 00010246 RAX: ffffffff8408fc0b RBX: 00000000002d3cb6 RCX: 0000000000040000 RDX: ffffc9000b24a000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: 000000b4f2d90000 R08: ffffffff8408f5aa R09: 1ffffffff25f54b0 R10: dffffc0000000000 R11: fffffbfff25f54b1 R12: 1ffff9200081ed58 R13: ffffc900040f6aa0 R14: ffff8880533a00bb R15: 000000000000001b FS: 00007fa2e10d16c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb51ae7fc00 CR3: 0000000017ee0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
