loop0: detected capacity change from 0 to 2048
NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024)
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3604 Comm: syz-executor165 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+0xb5/0x3e0 fs/nilfs2/bmap.c:69
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 95 02 00 00 48 8b 83 d8 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 7d 02 00 00 4c 89 e6 48 89 e9 44 89 fa 48 89 df
RSP: 0018:ffffc90003fff6d8 EFLAGS: 00010256
RAX: 0000000000000000 RBX: ffff888070c02688 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888070c02760
RBP: ffffc90003fff7b8 R08: 0000000000000001 R09: ffff888070c026cf
R10: ffffed100e1804d9 R11: 000000000008c07d R12: 0000000000000002
R13: 1ffff920007ffedc R14: ffff888070c026c0 R15: 0000000000000001
FS:  000055555592f300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cc73acd2b8 CR3: 0000000021384000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline]
 nilfs_mdt_submit_block+0x1a1/0xaa0 fs/nilfs2/mdt.c:142
 nilfs_mdt_read_block+0x92/0x3c0 fs/nilfs2/mdt.c:176
 nilfs_mdt_get_block+0xe6/0xdb0 fs/nilfs2/mdt.c:251
 nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216
 nilfs_palloc_get_entry_block+0x167/0x1d0 fs/nilfs2/alloc.c:318
 nilfs_ifile_get_inode_block+0xbf/0x190 fs/nilfs2/ifile.c:143
 __nilfs_read_inode fs/nilfs2/inode.c:477 [inline]
 nilfs_iget+0x208/0x870 fs/nilfs2/inode.c:603
 nilfs_get_root_dentry+0x26/0x240 fs/nilfs2/super.c:904
 nilfs_fill_super fs/nilfs2/super.c:1078 [inline]
 nilfs_mount+0xbb2/0xfb0 fs/nilfs2/super.c:1317
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc6fb03f66a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff29b675f8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc6fb03f66a
RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 00007fff29b67610
RBP: 00007fff29b67610 R08: 00007fff29b67650 R09: 000055555592f2c0
R10: 0000000000000080 R11: 0000000000000286 R12: 0000000000000004
R13: 00007fff29b67650 R14: 000000000000003a R15: 0000000020000770
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nilfs_bmap_lookup_at_level+0xb5/0x3e0 fs/nilfs2/bmap.c:69
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 95 02 00 00 48 8b 83 d8 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 7d 02 00 00 4c 89 e6 48 89 e9 44 89 fa 48 89 df
RSP: 0018:ffffc90003fff6d8 EFLAGS: 00010256
RAX: 0000000000000000 RBX: ffff888070c02688 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888070c02760
RBP: ffffc90003fff7b8 R08: 0000000000000001 R09: ffff888070c026cf
R10: ffffed100e1804d9 R11: 000000000008c07d R12: 0000000000000002
R13: 1ffff920007ffedc R14: ffff888070c026c0 R15: 0000000000000001
FS:  000055555592f300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005d84c8 CR3: 0000000021384000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 95 02 00 00    	jne    0x2a7
  12:	48 8b 83 d8 00 00 00 	mov    0xd8(%rbx),%rax
  19:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  20:	fc ff df
  23:	48 89 c1             	mov    %rax,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1) <-- trapping instruction
  2e:	0f 85 7d 02 00 00    	jne    0x2b1
  34:	4c 89 e6             	mov    %r12,%rsi
  37:	48 89 e9             	mov    %rbp,%rcx
  3a:	44 89 fa             	mov    %r15d,%edx
  3d:	48 89 df             	mov    %rbx,%rdi