NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop2): mounting unchecked fs
NILFS (loop2): recovery complete
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10161 at include/linux/backing-dev.h:286 inode_to_wb include/linux/backing-dev.h:283 [inline]
WARNING: CPU: 0 PID: 10161 at include/linux/backing-dev.h:286 account_page_dirtied+0x3c2/0x480 mm/page-writeback.c:2430
Modules linked in:
CPU: 0 PID: 10161 Comm: syz-executor.2 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:inode_to_wb include/linux/backing-dev.h:283 [inline]
RIP: 0010:account_page_dirtied+0x3c2/0x480 mm/page-writeback.c:2430
Code: 5d 41 5e 41 5f 5d c3 e8 bc dc d6 ff 4c 89 f7 4c 89 fe 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 33 c7 22 00 e8 9e dc d6 ff <0f> 0b 43 80 3c 2c 00 0f 85 87 fe ff ff e9 8a fe ff ff 89 d9 80 e1
RSP: 0018:ffffc9000720f118 EFLAGS: 00010083
RAX: ffffffff81a7af42 RBX: ffff888087030490 RCX: 0000000000040000
RDX: ffffc9000cc9c000 RSI: 000000000001a7e5 RDI: 000000000001a7e6
RBP: 0000000000000000 R08: ffffffff81a7adc2 R09: ffffed1010e06093
R10: ffffed1010e06093 R11: 0000000000000000 R12: 1ffff11010e06092
R13: dffffc0000000000 R14: ffffea0000be8200 R15: ffff888087030318
FS:  00007fb2ac3e7700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bec1def5c0 CR3: 0000000026eea000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __set_page_dirty+0x12a/0x380 fs/buffer.c:608
 mark_buffer_dirty+0x227/0x2d0 fs/buffer.c:1137
 nilfs_btree_commit_convert_and_insert fs/nilfs2/btree.c:1812 [inline]
 nilfs_btree_convert_and_insert+0xce8/0x1830 fs/nilfs2/btree.c:1877
 nilfs_bmap_do_insert fs/nilfs2/bmap.c:111 [inline]
 nilfs_bmap_insert+0x18c/0x360 fs/nilfs2/bmap.c:147
 nilfs_mdt_insert_new_block fs/nilfs2/mdt.c:44 [inline]
 nilfs_mdt_create_block+0x28e/0x920 fs/nilfs2/mdt.c:93
 nilfs_mdt_get_block+0x6f/0xa0 fs/nilfs2/mdt.c:254
 nilfs_palloc_get_block+0x142/0x240 fs/nilfs2/alloc.c:216
 nilfs_palloc_get_entry_block+0x1e5/0x2e0 fs/nilfs2/alloc.c:318
 nilfs_dat_prepare_entry fs/nilfs2/dat.c:43 [inline]
 nilfs_dat_prepare_alloc+0x5c/0x90 fs/nilfs2/dat.c:69
 nilfs_bmap_prepare_alloc_ptr fs/nilfs2/bmap.h:183 [inline]
 nilfs_direct_insert+0x1bb/0x520 fs/nilfs2/direct.c:122
 nilfs_bmap_do_insert fs/nilfs2/bmap.c:121 [inline]
 nilfs_bmap_insert+0x20d/0x360 fs/nilfs2/bmap.c:147
 nilfs_get_block+0x423/0x8e0 fs/nilfs2/inode.c:97
 __block_write_begin_int+0x6e5/0x1730 fs/buffer.c:2011
 nilfs_prepare_chunk fs/nilfs2/dir.c:92 [inline]
 nilfs_make_empty+0xea/0x7e0 fs/nilfs2/dir.c:591
 nilfs_mkdir+0x1ac/0x310 fs/nilfs2/namei.c:229
 vfs_mkdir+0x45b/0x640 fs/namei.c:3819
 do_mkdirat+0x267/0x3e0 fs/namei.c:3844
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb2ac3e7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 45821e84e0122b7f RSI: 0000000020001a40 RDI: 0000000000000007
RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc249d01ef R14: 00007fb2ac3e7300 R15: 0000000000022000