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BUG: KASAN: use-after-free in lbmIODone+0xcb0/0xf40 fs/jfs/jfs_logmgr.c:2207
Read of size 4 at addr ffff8880b0158308 by task loop0/25380

CPU: 1 PID: 25380 Comm: loop0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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_load4_noabort+0x88/0x90 mm/kasan/report.c:432
 lbmIODone+0xcb0/0xf40 fs/jfs/jfs_logmgr.c:2207
 bio_endio+0x488/0x830 block/bio.c:1780
 req_bio_endio block/blk-core.c:278 [inline]
 blk_update_request+0x30f/0xaf0 block/blk-core.c:3112
 blk_mq_end_request+0x4a/0x340 block/blk-mq.c:544
 lo_complete_rq+0x201/0x2d0 drivers/block/loop.c:487
 __blk_mq_complete_request block/blk-mq.c:583 [inline]
 blk_mq_complete_request+0x472/0x660 block/blk-mq.c:620
 loop_handle_cmd drivers/block/loop.c:1931 [inline]
 loop_queue_work+0x274/0x20c0 drivers/block/loop.c:1940
 kthread_worker_fn+0x292/0x730 kernel/kthread.c:700
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 25299:
 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 lbmLogInit fs/jfs/jfs_logmgr.c:1843 [inline]
 lmLogInit+0x301/0x13e0 fs/jfs/jfs_logmgr.c:1292
 open_inline_log fs/jfs/jfs_logmgr.c:1197 [inline]
 lmLogOpen+0x718/0x11e0 fs/jfs/jfs_logmgr.c:1090
 jfs_mount_rw+0x286/0x4b0 fs/jfs/jfs_mount.c:272
 jfs_fill_super+0x814/0xb50 fs/jfs/super.c:598
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 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 11008:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 lbmLogShutdown fs/jfs/jfs_logmgr.c:1886 [inline]
 lmLogShutdown+0x2c6/0x580 fs/jfs/jfs_logmgr.c:1706
 lmLogClose+0x4a1/0x610 fs/jfs/jfs_logmgr.c:1482
 jfs_umount+0x25f/0x310 fs/jfs/jfs_umount.c:129
 jfs_put_super+0x61/0x140 fs/jfs/super.c:223
 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

The buggy address belongs to the object at ffff8880b0158300
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 8 bytes inside of
 192-byte region [ffff8880b0158300, ffff8880b01583c0)
The buggy address belongs to the page:
page:ffffea0002c05600 count:1 mapcount:0 mapping:ffff88813bff0040 index:0xffff8880b0158c00
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002adbb48 ffffea00025d7388 ffff88813bff0040
raw: ffff8880b0158c00 ffff8880b0158000 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b0158200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880b0158280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880b0158300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8880b0158380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880b0158400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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