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BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
Read of size 8 at addr ffff8880af995e68 by task loop2/17200

CPU: 0 PID: 17200 Comm: loop2 Not tainted 4.14.202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160
 __wake_up_common_lock+0x9d/0x140 kernel/sched/wait.c:124
 lbmIODone+0x3c6/0xe00 fs/jfs/jfs_logmgr.c:2307
 bio_endio+0x27a/0x680 block/bio.c:1918
 req_bio_endio block/blk-core.c:204 [inline]
 blk_update_request+0x2d0/0xa30 block/blk-core.c:2765
 blk_mq_end_request+0x4c/0x1e0 block/blk-mq.c:530
 __blk_mq_complete_request+0x30b/0x6c0 block/blk-mq.c:571
 blk_mq_complete_request+0x52/0x60 block/blk-mq.c:591
 loop_handle_cmd drivers/block/loop.c:1784 [inline]
 loop_queue_work+0x227/0x1e80 drivers/block/loop.c:1793
 kthread_worker_fn+0x271/0x6c0 kernel/kthread.c:642
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 17193:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 lbmLogInit fs/jfs/jfs_logmgr.c:1842 [inline]
 lmLogInit+0x2f1/0x12f0 fs/jfs/jfs_logmgr.c:1292
 open_inline_log fs/jfs/jfs_logmgr.c:1197 [inline]
 lmLogOpen+0x6b1/0x10e0 fs/jfs/jfs_logmgr.c:1090
 jfs_mount_rw+0x236/0x430 fs/jfs/jfs_mount.c:271
 jfs_fill_super+0x78a/0xab0 fs/jfs/super.c:598
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 17193:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 lbmLogShutdown fs/jfs/jfs_logmgr.c:1885 [inline]
 lmLogInit+0xeaf/0x12f0 fs/jfs/jfs_logmgr.c:1437
 open_inline_log fs/jfs/jfs_logmgr.c:1197 [inline]
 lmLogOpen+0x6b1/0x10e0 fs/jfs/jfs_logmgr.c:1090
 jfs_mount_rw+0x236/0x430 fs/jfs/jfs_mount.c:271
 jfs_fill_super+0x78a/0xab0 fs/jfs/super.c:598
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880af995e00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 104 bytes inside of
 192-byte region [ffff8880af995e00, ffff8880af995ec0)
The buggy address belongs to the page:
page:ffffea0002be6540 count:1 mapcount:0 mapping:ffff8880af995000 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880af995000 0000000000000000 0000000100000010
raw: ffffea0002bc1ea0 ffffea0002c2cea0 ffff88813fe80040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880af995d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880af995d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880af995e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880af995e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880af995f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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