syzbot has found a reproducer for the following issue on: HEAD commit: 1ae78a14516b Merge tag '6.4-rc-ksmbd-server-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1795c2f7c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=50dff7d7b2557ef1 dashboard link: https://syzkaller.appspot.com/bug?extid=2e15a1e4284bf8517741 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1255f594280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165b28f8280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4818953c9914/disk-1ae78a14.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a78b3bf3e929/vmlinux-1ae78a14.xz kernel image: https://storage.googleapis.com/syzbot-assets/dae163980240/bzImage-1ae78a14.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/dd0e91b2ac87/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2e15a1e4284bf8517741@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7] CPU: 0 PID: 5860 Comm: syz-executor269 Not tainted 6.3.0-syzkaller-11301-g1ae78a14516b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:iput+0x40/0x8f0 fs/inode.c:1763 Code: 06 2a 91 ff 48 85 ed 0f 84 56 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 9d d8 00 00 00 48 89 d9 48 c1 e9 03 48 89 4c 24 08 <80> 3c 01 00 74 08 48 89 df e8 f2 f4 e8 ff 48 89 1c 24 48 8b 1b 48 RSP: 0018:ffffc9000aa87a10 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 00000000000000d6 RCX: 000000000000001a RDX: 0000000000000000 RSI: 0000000000000004 RDI: fffffffffffffffe RBP: fffffffffffffffe R08: dffffc0000000000 R09: ffffed100dab82ef R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88806e6e0000 R13: fffffffffffffffc R14: 00000000fffffffe R15: dffffc0000000000 FS: 00007fbc4e794700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbc55c5d908 CR3: 0000000071785000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> btrfs_orphan_cleanup+0xa55/0xcf0 fs/btrfs/inode.c:3629 create_snapshot+0x520/0x7e0 fs/btrfs/ioctl.c:852 btrfs_mksubvol+0x5d0/0x750 fs/btrfs/ioctl.c:994 btrfs_mksnapshot+0xb5/0xf0 fs/btrfs/ioctl.c:1040 __btrfs_ioctl_snap_create+0x338/0x450 fs/btrfs/ioctl.c:1293 btrfs_ioctl_snap_create+0x136/0x190 fs/btrfs/ioctl.c:1320 btrfs_ioctl+0xbbc/0xd40 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbc55c0cda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fbc4e7942f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbc55c987f0 RCX: 00007fbc55c0cda9 RDX: 0000000020001380 RSI: 0000000050009401 RDI: 0000000000000007 RBP: 00007fbc55c645ec R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007fbc55c635f0 R14: 697265765f666572 R15: 00007fbc55c987f8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:iput+0x40/0x8f0 fs/inode.c:1763 Code: 06 2a 91 ff 48 85 ed 0f 84 56 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 9d d8 00 00 00 48 89 d9 48 c1 e9 03 48 89 4c 24 08 <80> 3c 01 00 74 08 48 89 df e8 f2 f4 e8 ff 48 89 1c 24 48 8b 1b 48 RSP: 0018:ffffc9000aa87a10 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 00000000000000d6 RCX: 000000000000001a RDX: 0000000000000000 RSI: 0000000000000004 RDI: fffffffffffffffe RBP: fffffffffffffffe R08: dffffc0000000000 R09: ffffed100dab82ef R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88806e6e0000 R13: fffffffffffffffc R14: 00000000fffffffe R15: dffffc0000000000 FS: 00007fbc4e794700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005578470fb7a0 CR3: 0000000071785000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 2a 91 ff 48 85 ed sub -0x127ab701(%rcx),%dl 6: 0f 84 56 03 00 00 je 0x362 c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 13: fc ff df 16: 48 8d 9d d8 00 00 00 lea 0xd8(%rbp),%rbx 1d: 48 89 d9 mov %rbx,%rcx 20: 48 c1 e9 03 shr $0x3,%rcx 24: 48 89 4c 24 08 mov %rcx,0x8(%rsp) * 29: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) <-- trapping instruction 2d: 74 08 je 0x37 2f: 48 89 df mov %rbx,%rdi 32: e8 f2 f4 e8 ff callq 0xffe8f529 37: 48 89 1c 24 mov %rbx,(%rsp) 3b: 48 8b 1b mov (%rbx),%rbx 3e: 48 rex.W --- 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.
