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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 ffff8801d97bd4e0 by task syz-executor4/4537

CPU: 1 PID: 4537 Comm: syz-executor4 Not tainted 4.14.0-rc5+ #91
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
netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'.
 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: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
netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'.
 __queue_work+0x235/0x1150 kernel/workqueue.c:1401
sctp: [Deprecated]: syz-executor3 (pid 4578) Use of int in maxseg socket option.
Use struct sctp_assoc_value instead
 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+0x1b1/0x1520 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: 0033:0x452869
RSP: 002b:00007f7068d93be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000020ef4000 RSI: 00000000000089e0 RDI: 0000000000000018
RBP: 00000000000003d9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3cf8
R13: 00000000ffffffff R14: 00007f7068d946d4 R15: 0000000000000000

Allocated by task 4537:
 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+0x1b1/0x1520 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 4543:
 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+0x1b1/0x1520 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 ffff8801d97bd3c0
 which belongs to the cache kcm_psock_cache of size 632
The buggy address is located 288 bytes inside of
 632-byte region [ffff8801d97bd3c0, ffff8801d97bd638)
The buggy address belongs to the page:
page:ffffea000765ef40 count:1 mapcount:0 mapping:ffff8801d97bd0c0 index:0x0
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801d97bd0c0 0000000000000000 0000000100000005
raw: ffffea000737b8a0 ffff8801d408b348 ffff8801d429cb40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d97bd380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801d97bd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801d97bd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8801d97bd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d97bd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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