==================================================================
BUG: KASAN: use-after-free in nilfs_segctor_confirm+0x15f/0x180 fs/nilfs2/segment.c:839
Read of size 8 at addr ffff8880a150d8f0 by task syz-executor.2/8169

CPU: 1 PID: 8169 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 nilfs_segctor_confirm+0x15f/0x180 fs/nilfs2/segment.c:839
 nilfs_segctor_destroy fs/nilfs2/segment.c:2726 [inline]
 nilfs_detach_log_writer+0x868/0x9f0 fs/nilfs2/segment.c:2807
 nilfs_put_super+0x3f/0x1a0 fs/nilfs2/super.c:469
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f7040681537
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 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:00007ffc42684848 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7040681537
RDX: 00007ffc4268491b RSI: 000000000000000a RDI: 00007ffc42684910
RBP: 00007ffc42684910 R08: 00000000ffffffff R09: 00007ffc426846e0
R10: 00005555573e1903 R11: 0000000000000246 R12: 00007f70406dab24
R13: 00007ffc426859d0 R14: 00005555573e1810 R15: 00007ffc42685a10

Allocated by task 16486:
 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 nilfs_find_or_create_root+0x84/0x460 fs/nilfs2/the_nilfs.c:752
 nilfs_attach_checkpoint+0xc1/0x4b0 fs/nilfs2/super.c:520
 nilfs_fill_super fs/nilfs2/super.c:1068 [inline]
 nilfs_mount+0xa25/0xe70 fs/nilfs2/super.c:1321
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8169:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 nilfs_put_root+0xb1/0xd0 fs/nilfs2/the_nilfs.c:809
 nilfs_clear_inode+0x1d1/0x240 fs/nilfs2/inode.c:776
 nilfs_evict_inode+0x318/0x440 fs/nilfs2/inode.c:789
 evict+0x2ed/0x760 fs/inode.c:559
 dispose_list+0x124/0x1f0 fs/inode.c:594
 evict_inodes+0x341/0x430 fs/inode.c:644
 generic_shutdown_super+0xb3/0x370 fs/super.c:448
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a150d8c0
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 48 bytes inside of
 256-byte region [ffff8880a150d8c0, ffff8880a150d9c0)
The buggy address belongs to the page:
page:ffffea0002854340 count:1 mapcount:0 mapping:ffff88813bff07c0 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea00024d8848 ffffea00026f8b48 ffff88813bff07c0
raw: 0000000000000000 ffff8880a150d000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a150d780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a150d800: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
>ffff8880a150d880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                             ^
 ffff8880a150d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a150d980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
F2FS-fs (loop1): Found nat_bits in checkpoint
F2FS-fs (loop1): Mounted with checkpoint version = 48b305e5