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Message-ID: <67eef48d.050a0220.9040b.0262.GAE@google.com> Date: Thu, 03 Apr 2025 13:50:21 -0700 From: syzbot <syzbot+baee8591f336cab0958b@...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_snapshot_tree_oldest_subvol Hello, syzbot found the following issue on: HEAD commit: a2cc6ff5ec8f Merge tag 'firewire-updates-6.15' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12482fb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6fe3b5e6a2cb1cc2 dashboard link: https://syzkaller.appspot.com/bug?extid=baee8591f336cab0958b 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=10530be4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d6d404580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-a2cc6ff5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c58c1555aab7/vmlinux-a2cc6ff5.xz kernel image: https://storage.googleapis.com/syzbot-assets/61fb9d013359/bzImage-a2cc6ff5.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/86cf46d3a5d9/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+baee8591f336cab0958b@...kaller.appspotmail.com done bcachefs (loop0): accounting_read... done bcachefs (loop0): alloc_read... done bcachefs (loop0): snapshots_read... done bcachefs (loop0): check_allocations... Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 UID: 0 PID: 5318 Comm: syz-executor394 Not tainted 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #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_snapshot_tree_oldest_subvol+0x1d3/0x6a0 fs/bcachefs/snapshot.c:400 Code: e6 e8 81 dd 36 fd 4c 39 e5 0f 86 c9 03 00 00 e8 13 db 36 fd 49 6b c4 38 49 01 c6 49 83 c6 18 49 83 c6 20 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c6 03 00 00 41 8b 2e 31 ff 89 ee e8 24 RSP: 0018:ffffc9000d46e020 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffff888000f98000 RDX: 0000000000000000 RSI: 00000000ffeb487f RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff848c7c5f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffeb487f R13: dffffc0000000000 R14: 0000000000000020 R15: 000000000014b780 FS: 0000555584fe3380(0000) GS:ffff88808c599000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055835cf3c000 CR3: 0000000044318000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bch2_inum_snap_offset_err_msg_trans+0x374/0x680 fs/bcachefs/error.c:691 bch2_indirect_extent_missing_error+0x411/0x1290 fs/bcachefs/reflink.c:192 gc_trigger_reflink_p_segment fs/bcachefs/reflink.c:392 [inline] __trigger_reflink_p+0x196c/0x1cc0 fs/bcachefs/reflink.c:432 bch2_trigger_reflink_p+0x299/0x380 fs/bcachefs/reflink.c:451 bch2_key_trigger fs/bcachefs/bkey_methods.h:88 [inline] bch2_gc_mark_key+0x6bd/0x1180 fs/bcachefs/btree_gc.c:639 bch2_gc_btree fs/bcachefs/btree_gc.c:677 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:740 [inline] bch2_check_allocations+0x1488/0x6ab0 fs/bcachefs/btree_gc.c:1042 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:285 bch2_fs_recovery+0x292a/0x3e20 fs/bcachefs/recovery.c:936 bch2_fs_start+0x2fb/0x610 fs/bcachefs/super.c:1060 bch2_fs_get_tree+0x113e/0x18f0 fs/bcachefs/fs.c:2253 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f22f815ae2a 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:00007ffd84c61a58 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd84c61a70 RCX: 00007f22f815ae2a RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00007ffd84c61a70 RBP: 0000200000000000 R08: 00007ffd84c61ab0 R09: 0000000000005995 R10: 0000000000800001 R11: 0000000000000282 R12: 0000200000000040 R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffd84c61ab0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bch2_snapshot_tree_oldest_subvol+0x1d3/0x6a0 fs/bcachefs/snapshot.c:400 Code: e6 e8 81 dd 36 fd 4c 39 e5 0f 86 c9 03 00 00 e8 13 db 36 fd 49 6b c4 38 49 01 c6 49 83 c6 18 49 83 c6 20 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c6 03 00 00 41 8b 2e 31 ff 89 ee e8 24 RSP: 0018:ffffc9000d46e020 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffff888000f98000 RDX: 0000000000000000 RSI: 00000000ffeb487f RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff848c7c5f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffeb487f R13: dffffc0000000000 R14: 0000000000000020 R15: 000000000014b780 FS: 0000555584fe3380(0000) GS:ffff88808c599000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556b9781f0c8 CR3: 0000000044318000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e6 e8 out %al,$0xe8 2: 81 dd 36 fd 4c 39 sbb $0x394cfd36,%ebp 8: e5 0f in $0xf,%eax a: 86 c9 xchg %cl,%cl c: 03 00 add (%rax),%eax e: 00 e8 add %ch,%al 10: 13 db adc %ebx,%ebx 12: 36 fd ss std 14: 49 6b c4 38 imul $0x38,%r12,%rax 18: 49 01 c6 add %rax,%r14 1b: 49 83 c6 18 add $0x18,%r14 1f: 49 83 c6 20 add $0x20,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 c6 03 00 00 jne 0x3fd 37: 41 8b 2e mov (%r14),%ebp 3a: 31 ff xor %edi,%edi 3c: 89 ee mov %ebp,%esi 3e: e8 .byte 0xe8 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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