FAT-fs (loop3): bogus sectors per cluster 0
FAT-fs (loop3): Can't find a valid FAT filesystem
==================================================================
BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:328 [inline]
BUG: KASAN: use-after-free in work_is_static_object+0x39/0x40 kernel/workqueue.c:442
FAT-fs (loop3): bogus sectors per cluster 0
Read of size 8 at addr ffff8801ae36bde0 by task kworker/1:4/7776
CPU: 1 PID: 7776 Comm: kworker/1:4 Not tainted 4.18.0-rc8+ #184
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
FAT-fs (loop3): Can't find a valid FAT filesystem
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
constant_test_bit arch/x86/include/asm/bitops.h:328 [inline]
work_is_static_object+0x39/0x40 kernel/workqueue.c:442
debug_object_activate+0x2fc/0x690 lib/debugobjects.c:508
debug_work_activate kernel/workqueue.c:491 [inline]
__queue_work+0x1ca/0x1410 kernel/workqueue.c:1380
queue_work_on+0x19a/0x1e0 kernel/workqueue.c:1486
queue_work include/linux/workqueue.h:512 [inline]
schedule_work include/linux/workqueue.h:570 [inline]
p9_poll_mux net/9p/trans_fd.c:628 [inline]
p9_poll_workfn+0x55e/0x6d0 net/9p/trans_fd.c:1107
process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
kthread+0x345/0x410 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Allocated by task 15695:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
kmalloc include/linux/slab.h:513 [inline]
kzalloc include/linux/slab.h:707 [inline]
p9_socket_open+0x4e/0x220 net/9p/trans_fd.c:823
p9_fd_create_unix+0x2a1/0x370 net/9p/trans_fd.c:1018
p9_client_create+0x8ed/0x1770 net/9p/client.c:1063
v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400
v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
mount_fs+0xae/0x328 fs/super.c:1277
vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
vfs_kern_mount fs/namespace.c:1027 [inline]
do_new_mount fs/namespace.c:2518 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2848
ksys_mount+0x12d/0x140 fs/namespace.c:3064
__do_sys_mount fs/namespace.c:3078 [inline]
__se_sys_mount fs/namespace.c:3075 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 15695:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xd9/0x260 mm/slab.c:3813
p9_fd_close+0x416/0x5b0 net/9p/trans_fd.c:893
p9_client_create+0xa9a/0x1770 net/9p/client.c:1077
v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400
v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
mount_fs+0xae/0x328 fs/super.c:1277
vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
vfs_kern_mount fs/namespace.c:1027 [inline]
do_new_mount fs/namespace.c:2518 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2848
ksys_mount+0x12d/0x140 fs/namespace.c:3064
__do_sys_mount fs/namespace.c:3078 [inline]
__se_sys_mount fs/namespace.c:3075 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801ae36bcc0
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 288 bytes inside of
512-byte region [ffff8801ae36bcc0, ffff8801ae36bec0)
The buggy address belongs to the page:
page:ffffea0006b8dac0 count:1 mapcount:0 mapping:ffff8801dac00940 index:0xffff8801ae36b540
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0006b875c8 ffffea0006b7d908 ffff8801dac00940
raw: ffff8801ae36b540 ffff8801ae36b040 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801ae36bc80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff8801ae36bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801ae36bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801ae36be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801ae36be80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================