======================================================= JBD2: Ignoring recovery information on journal ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. /dev/loop0: Can't open blockdev Oops: general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7] CPU: 1 UID: 0 PID: 5983 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:xfs_mount_free+0x27/0x1a0 fs/xfs/xfs_super.c:815 Code: 90 90 90 41 57 41 56 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 d7 f1 41 fe 4c 8d b3 a0 01 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 9a 24 a9 fe 4d 8b 36 4d 85 f6 74 RSP: 0018:ffffc90004077b68 EFLAGS: 00010202 RAX: 0000000000000034 RBX: 0000000000000000 RCX: ffff88816aad1d40 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc90004077c00 R08: ffff8881b715c077 R09: 1ffff11036e2b80e R10: dffffc0000000000 R11: ffffed1036e2b80f R12: dffffc0000000000 R13: ffff8881b715c638 R14: 00000000000001a0 R15: ffff8881b715c768 FS: 00005555782c2500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001200 CR3: 0000000174202000 CR4: 00000000000006f0 Call Trace: deactivate_locked_super+0xbc/0x130 fs/super.c:474 get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698 vfs_get_tree+0x92/0x2a0 fs/super.c:1756 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x329/0xa50 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f341a99acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff965f4398 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f341ac15fa0 RCX: 00007f341a99acb9 RDX: 0000200000001200 RSI: 00002000000000c0 RDI: 0000200000000240 RBP: 00007f341aa08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000280c002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f341ac15fac R14: 00007f341ac15fa0 R15: 00007f341ac15fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:xfs_mount_free+0x27/0x1a0 fs/xfs/xfs_super.c:815 Code: 90 90 90 41 57 41 56 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 d7 f1 41 fe 4c 8d b3 a0 01 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 9a 24 a9 fe 4d 8b 36 4d 85 f6 74 RSP: 0018:ffffc90004077b68 EFLAGS: 00010202 RAX: 0000000000000034 RBX: 0000000000000000 RCX: ffff88816aad1d40 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc90004077c00 R08: ffff8881b715c077 R09: 1ffff11036e2b80e R10: dffffc0000000000 R11: ffffed1036e2b80f R12: dffffc0000000000 R13: ffff8881b715c638 R14: 00000000000001a0 R15: ffff8881b715c768 FS: 00005555782c2500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001200 CR3: 0000000174202000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 41 57 push %r15 5: 41 56 push %r14 7: 41 54 push %r12 9: 53 push %rbx a: 48 89 fb mov %rdi,%rbx d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 14: fc ff df 17: e8 d7 f1 41 fe call 0xfe41f1f3 1c: 4c 8d b3 a0 01 00 00 lea 0x1a0(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 9a 24 a9 fe call 0xfea924d3 39: 4d 8b 36 mov (%r14),%r14 3c: 4d 85 f6 test %r14,%r14 3f: 74 .byte 0x74