BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:276 [inline]
BUG: KASAN: use-after-free in atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:44 [inline]
BUG: KASAN: use-after-free in get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709
Read of size 8 at addr ffff8801c9ae6138 by task syz-executor6/3030

CPU: 1 PID: 3030 Comm: syz-executor6 Not tainted 4.13.0+ #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x24e/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:276 [inline]
 atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:44 [inline]
 get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709
 __queue_work+0x235/0x1150 kernel/workqueue.c:1401
 queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1486
 queue_work include/linux/workqueue.h:489 [inline]
 strp_check_rcv+0x25/0x30 net/strparser/strparser.c:553
 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:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f546431dc08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000718160 RCX: 0000000000451e59
RDX: 00000000209b9000 RSI: 00000000000089e0 RDI: 000000000000000b
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004bb500
R13: 00000000ffffffff R14: 0000000000000002 R15: 0000000000000003

Allocated by task 3030:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 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:3561
 kmem_cache_zalloc include/linux/slab.h:656 [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:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 3038:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 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:3503 [inline]
 kmem_cache_free+0x77/0x280 mm/slab.c:3763
 kcm_unattach+0xe50/0x1510 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:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801c9ae6000
 which belongs to the cache kcm_psock_cache of size 664
The buggy address is located 312 bytes inside of
 664-byte region [ffff8801c9ae6000, ffff8801c9ae6298)
The buggy address belongs to the page:
page:ffffea000726b980 count:1 mapcount:0 mapping:ffff8801c9ae6000 index:0x0 compound_mapcount: 0
flags: 0x200000000008100(slab|head)
raw: 0200000000008100 ffff8801c9ae6000 0000000000000000 0000000100000009
raw: ffffea000720d5a0 ffffea000720fc20 ffff8801d328a640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c9ae6000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c9ae6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c9ae6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801c9ae6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c9ae6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================