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BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:178 [inline]
BUG: KASAN: use-after-free in atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:45 [inline]
BUG: KASAN: use-after-free in get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:710
Read of size 8 at addr ffff8801ca074f60 by task syz-executor6/1720

CPU: 0 PID: 1720 Comm: syz-executor6 Not tainted 4.14.0+ #125
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+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:178 [inline]
 atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:45 [inline]
 get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:710
 __queue_work+0x278/0x1220 kernel/workqueue.c:1402
 queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1487
 queue_work include/linux/workqueue.h:491 [inline]
 strp_check_rcv+0x25/0x30 net/strparser/strparser.c:552
 kcm_attach net/kcm/kcmsock.c:1439 [inline]
 kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
 kcm_ioctl+0x826/0x1610 net/kcm/kcmsock.c:1695
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452879
RSP: 002b:00007fb3b0d2abe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879
RDX: 0000000020a9e000 RSI: 00000000000089e0 RDI: 0000000000000021
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007fb3b0d2b9c0 R15: 0000000000000000

Allocated by task 1720:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3562
 kmem_cache_zalloc include/linux/slab.h:657 [inline]
 kcm_attach net/kcm/kcmsock.c:1394 [inline]
 kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline]
 kcm_ioctl+0x2d1/0x1610 net/kcm/kcmsock.c:1695
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1730:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3504 [inline]
 kmem_cache_free+0x77/0x280 mm/slab.c:3764
 kcm_unattach+0xe53/0x1510 net/kcm/kcmsock.c:1563
 kcm_unattach_ioctl net/kcm/kcmsock.c:1608 [inline]
 kcm_ioctl+0xdf0/0x1610 net/kcm/kcmsock.c:1705
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801ca074e80
 which belongs to the cache kcm_psock_cache of size 576
The buggy address is located 224 bytes inside of
 576-byte region [ffff8801ca074e80, ffff8801ca0750c0)
The buggy address belongs to the page:
page:ffffea0007281d00 count:1 mapcount:0 mapping:ffff8801ca0740c0 index:0xffff8801ca075c40 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801ca0740c0 ffff8801ca075c40 0000000100000002
raw: ffffea0007284fa0 ffff8801d2b75240 ffff8801d2915800 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ca074e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ca074e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801ca074f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8801ca074f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801ca075000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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