NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop0): mounting unchecked fs
NILFS (loop0): recovery complete
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
WARNING: CPU: 1 PID: 6493 at include/linux/backing-dev.h:339 inode_to_wb include/linux/backing-dev.h:339 [inline]
WARNING: CPU: 1 PID: 6493 at include/linux/backing-dev.h:339 account_page_dirtied+0x8e9/0xbe0 mm/page-writeback.c:2420
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6493 Comm: segctord Not tainted 4.19.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 panic+0x2ac/0x565 kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1e1/0x330 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:inode_to_wb include/linux/backing-dev.h:339 [inline]
RIP: 0010:account_page_dirtied+0x8e9/0xbe0 mm/page-writeback.c:2420
Code: 88 01 00 00 be ff ff ff ff 48 8d 78 70 e8 0f 30 c6 ff 31 ff 89 c3 89 c6 e8 34 a5 e0 ff 85 db 0f 85 1c f9 ff ff e8 b7 a3 e0 ff <0f> 0b e9 10 f9 ff ff e8 ab a3 e0 ff 4c 89 e6 4c 89 ef e8 d0 d7 2f
RSP: 0018:ffff8880a3ed7868 EFLAGS: 00010093
RAX: ffff888094c3e380 RBX: 0000000000000000 RCX: ffffffff81911f1c
RDX: 0000000000000000 RSI: ffffffff81911f29 RDI: 0000000000000005
RBP: ffff888082bceb48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 000000000000002d R12: ffffea000232f740
R13: ffff888082bce9c0 R14: ffff888082bce838 R15: ffffea000232f748
 __set_page_dirty+0x7f/0x3f0 fs/buffer.c:582
 mark_buffer_dirty+0x442/0x5f0 fs/buffer.c:1111
 nilfs_btree_propagate_p fs/nilfs2/btree.c:1890 [inline]
 nilfs_btree_propagate+0x72f/0xd80 fs/nilfs2/btree.c:2086
 nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337
 nilfs_collect_dat_data+0x45/0xd0 fs/nilfs2/segment.c:630
 nilfs_segctor_apply_buffers+0x14a/0x490 fs/nilfs2/segment.c:1014
 nilfs_segctor_scan_file+0x3ae/0x6b0 fs/nilfs2/segment.c:1063
 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1225 [inline]
 nilfs_segctor_collect fs/nilfs2/segment.c:1494 [inline]
 nilfs_segctor_do_construct+0x15bf/0x80e0 fs/nilfs2/segment.c:2036
 nilfs_segctor_construct+0x764/0xae0 fs/nilfs2/segment.c:2372
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2480 [inline]
 nilfs_segctor_thread+0x3cb/0xf50 fs/nilfs2/segment.c:2563
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..