======================================================
WARNING: possible circular locking dependency detected
4.14.281-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:6/9899 is trying to acquire lock:
 (sk_lock-AF_INET){+.+.}, at: [<ffffffff86825ace>] do_strp_work net/strparser/strparser.c:415 [inline]
 (sk_lock-AF_INET){+.+.}, at: [<ffffffff86825ace>] strp_work+0x3e/0x100 net/strparser/strparser.c:434

but task is already holding lock:
 ((&strp->work)){+.+.}, at: [<ffffffff81364fb6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092

which lock already depends on the new lock.

9pnet: Insufficient options for proto=fd

the existing dependency chain (in reverse order) is:

-> #1 ((&strp->work)){+.+.}:
       flush_work+0xad/0x770 kernel/workqueue.c:2890
       __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965
       strp_done+0x53/0xd0 net/strparser/strparser.c:519
       kcm_attach net/kcm/kcmsock.c:1429 [inline]
       kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline]
       kcm_ioctl+0x828/0xfb0 net/kcm/kcmsock.c:1701
       sock_do_ioctl net/socket.c:974 [inline]
       sock_ioctl+0x2cc/0x4c0 net/socket.c:1071
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:500 [inline]
       do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
       SYSC_ioctl fs/ioctl.c:701 [inline]
       SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (sk_lock-AF_INET){+.+.}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       lock_sock_nested+0xb7/0x100 net/core/sock.c:2813
       do_strp_work net/strparser/strparser.c:415 [inline]
       strp_work+0x3e/0x100 net/strparser/strparser.c:434
       process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
       worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
       kthread+0x30d/0x420 kernel/kthread.c:232
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock((&strp->work));
                               lock(sk_lock-AF_INET);
                               lock((&strp->work));
  lock(sk_lock-AF_INET);

 *** DEADLOCK ***

2 locks held by kworker/u4:6/9899:
 #0:  ("%s""kstrp"){+.+.}, at: [<ffffffff81364f80>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  ((&strp->work)){+.+.}, at: [<ffffffff81364fb6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
overlayfs: './bus' not a directory

stack backtrace:
CPU: 1 PID: 9899 Comm: kworker/u4:6 Not tainted 4.14.281-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kstrp strp_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 lock_sock_nested+0xb7/0x100 net/core/sock.c:2813
 do_strp_work net/strparser/strparser.c:415 [inline]
 strp_work+0x3e/0x100 net/strparser/strparser.c:434
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
9pnet: Insufficient options for proto=fd
FAT-fs (loop4): bogus number of FAT sectors
FAT-fs (loop4): Can't find a valid FAT filesystem
overlayfs: './bus' not a directory
overlayfs: failed to resolve './file1': -2
overlayfs: failed to resolve './file1': -2
overlayfs: failed to resolve './file1': -2
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: failed to resolve './file1': -2
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: failed to resolve './file1': -2
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
print_req_error: 55 callbacks suppressed
print_req_error: I/O error, dev loop5, sector 0
overlayfs: failed to resolve './file1': -2
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: failed to resolve './file1': -2
overlayfs: filesystem on './bus' not supported
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: filesystem on './bus' not supported
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: missing 'lowerdir'
IPVS: ftp: loaded support on port[0] = 21
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lower" or missing value
9pnet: Insufficient options for proto=fd
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: missing 'lowerdir'
overlayfs: filesystem on './bus' not supported
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
overlayfs: './bus' not a directory
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: filesystem on './bus' not supported
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lowerd" or missing value
9pnet: Insufficient options for proto=fd
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
9pnet: Insufficient options for proto=fd
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
9pnet: Insufficient options for proto=fd
overlayfs: unrecognized mount option "lower" or missing value
overlayfs: filesystem on './bus' not supported
overlayfs: filesystem on './bus' not supported
overlayfs: filesystem on './bus' not supported
overlayfs: filesystem on './bus' not supported
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: unrecognized mount option "lowerd" or missing value
overlayfs: unrecognized mount option "lowerd" or missing value