loop2: detected capacity change from 0 to 2048
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 13176 Comm: syz-executor.2 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:nilfs_bmap_lookup_at_level+0xeb/0x3c0 fs/nilfs2/bmap.c:69
Code: 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 c9 b3 8e fe 4c 8b 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 a7 b3 8e fe 4c 89 e7 4c 89 fe 44 89
RSP: 0018:ffffc90003caf420 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888039593430 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888039593398
RBP: ffffc90003caf4d0 R08: dffffc0000000000 R09: ffffed10072b2674
R10: ffffed10072b2674 R11: 1ffff110072b2673 R12: ffff888039593358
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f8364c51700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c014075f90 CR3: 0000000079de0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline]
 nilfs_mdt_submit_block+0x23d/0x520 fs/nilfs2/mdt.c:142
 nilfs_mdt_read_block+0xe7/0x440 fs/nilfs2/mdt.c:176
 nilfs_mdt_get_block+0x109/0x820 fs/nilfs2/mdt.c:251
 nilfs_palloc_get_block+0x142/0x240 fs/nilfs2/alloc.c:216
 nilfs_palloc_get_entry_block+0x1e8/0x2e0 fs/nilfs2/alloc.c:318
 nilfs_ifile_get_inode_block+0xf0/0x1a0 fs/nilfs2/ifile.c:143
 __nilfs_read_inode fs/nilfs2/inode.c:477 [inline]
 nilfs_iget+0x24d/0x820 fs/nilfs2/inode.c:603
 nilfs_get_root_dentry+0x28/0x230 fs/nilfs2/super.c:904
 nilfs_fill_super+0x450/0x650 fs/nilfs2/super.c:1078
 nilfs_mount+0x673/0x9e0 fs/nilfs2/super.c:1317
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8363a8cada
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 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:00007f8364c50f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f8363a8cada
RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 00007f8364c50fe0
RBP: 00007f8364c51020 R08: 00007f8364c51020 R09: 00000000200000c0
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200000c0
R13: 0000000020000100 R14: 00007f8364c50fe0 R15: 0000000020000c40
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nilfs_bmap_lookup_at_level+0xeb/0x3c0 fs/nilfs2/bmap.c:69
Code: 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 c9 b3 8e fe 4c 8b 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 a7 b3 8e fe 4c 89 e7 4c 89 fe 44 89
RSP: 0018:ffffc90003caf420 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888039593430 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888039593398
RBP: ffffc90003caf4d0 R08: dffffc0000000000 R09: ffffed10072b2674
R10: ffffed10072b2674 R11: 1ffff110072b2673 R12: ffff888039593358
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f8364c51700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c013143f88 CR3: 0000000079de0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   6:	08 48 89             	or     %cl,-0x77(%rax)
   9:	df e8                	fucomip %st(0),%st
   b:	c9                   	leaveq
   c:	b3 8e                	mov    $0x8e,%bl
   e:	fe 4c 8b 33          	decb   0x33(%rbx,%rcx,4)
  12:	4c 89 f0             	mov    %r14,%rax
  15:	48 c1 e8 03          	shr    $0x3,%rax
  19:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  20:	fc ff df
* 23:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  27:	74 08                	je     0x31
  29:	4c 89 f7             	mov    %r14,%rdi
  2c:	e8 a7 b3 8e fe       	callq  0xfe8eb3d8
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	4c 89 fe             	mov    %r15,%rsi
  37:	44                   	rex.R
  38:	89                   	.byte 0x89