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Message-ID: <67945a95.050a0220.2eae65.0023.GAE@google.com> Date: Fri, 24 Jan 2025 19:29:25 -0800 From: syzbot <syzbot+2875f6362e0214a32381@...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?] general protection fault in bch2_subvolume_delete Hello, syzbot found the following issue on: HEAD commit: c4b9570cfb63 Merge tag 'audit-pr-20250121' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120c1824580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d46425e33fe266e dashboard link: https://syzkaller.appspot.com/bug?extid=2875f6362e0214a32381 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=125c3618580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11de5964580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c4b9570c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/731d6adef14e/vmlinux-c4b9570c.xz kernel image: https://storage.googleapis.com/syzbot-assets/fba145e47ede/bzImage-c4b9570c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/875e2f608701/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2875f6362e0214a32381@...kaller.appspotmail.com bcachefs (loop0): scanning for missing backpointers in 4/128 buckets done bcachefs (loop0): reconstruct_snapshots... done bcachefs (loop0): check_subvols... subvolume 1 points to missing subvolume root 4096:4294967295, fixing Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5303 Comm: syz-executor216 Not tainted 6.13.0-syzkaller-02526-gc4b9570cfb63 #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_subvolume_delete fs/bcachefs/subvolume.c:444 [inline] RIP: 0010:bch2_subvolume_delete+0x24bc/0x3bb0 fs/bcachefs/subvolume.c:468 Code: 89 ef 48 8d b4 24 40 04 00 00 e8 bf 41 cc ff 4d 85 ff 75 9d e8 15 d9 49 fd 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 63 12 00 00 45 8b 34 24 44 89 f7 8b 5c 24 RSP: 0018:ffffc9000d0be760 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000fffff799 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000d0bebae RBP: ffffc9000d0bee30 R08: ffffc9000d0bebad R09: 0000000000000000 R10: ffffc9000d0beba0 R11: fffff52001a17d76 R12: 0000000000000000 R13: ffff88804351c000 R14: 0000000000000000 R15: fffffffffffff799 FS: 000055557ca05380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000565245a9fa40 CR3: 000000003407e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> check_subvol fs/bcachefs/subvolume.c:115 [inline] bch2_check_subvols+0x1cac/0x3d80 fs/bcachefs/subvolume.c:163 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x265a/0x3de0 fs/bcachefs/recovery.c:937 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1030 bch2_fs_get_tree+0xd8d/0x1740 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 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: 0033:0x7f95e107326a 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:00007ffde9323ca8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffde9323cc0 RCX: 00007f95e107326a RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007ffde9323cc0 RBP: 0000000000000004 R08: 00007ffde9323d00 R09: 00000000000058fc R10: 0000000001000000 R11: 0000000000000282 R12: 0000000001000000 R13: 00007ffde9323d00 R14: 0000000000000003 R15: 0000000001000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__bch2_subvolume_delete fs/bcachefs/subvolume.c:444 [inline] RIP: 0010:bch2_subvolume_delete+0x24bc/0x3bb0 fs/bcachefs/subvolume.c:468 Code: 89 ef 48 8d b4 24 40 04 00 00 e8 bf 41 cc ff 4d 85 ff 75 9d e8 15 d9 49 fd 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 63 12 00 00 45 8b 34 24 44 89 f7 8b 5c 24 RSP: 0018:ffffc9000d0be760 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000fffff799 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000d0bebae RBP: ffffc9000d0bee30 R08: ffffc9000d0bebad R09: 0000000000000000 R10: ffffc9000d0beba0 R11: fffff52001a17d76 R12: 0000000000000000 R13: ffff88804351c000 R14: 0000000000000000 R15: fffffffffffff799 FS: 000055557ca05380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005621c7fab0f8 CR3: 000000003407e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 ef mov %ebp,%edi 2: 48 8d b4 24 40 04 00 lea 0x440(%rsp),%rsi 9: 00 a: e8 bf 41 cc ff call 0xffcc41ce f: 4d 85 ff test %r15,%r15 12: 75 9d jne 0xffffffb1 14: e8 15 d9 49 fd call 0xfd49d92e 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 63 12 00 00 jne 0x1299 36: 45 8b 34 24 mov (%r12),%r14d 3a: 44 89 f7 mov %r14d,%edi 3d: 8b .byte 0x8b 3e: 5c pop %rsp 3f: 24 .byte 0x24 --- 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@...glegroups.com. 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 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. 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
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