======================================================
WARNING: possible circular locking dependency detected
4.14.291-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:0/5 is trying to acquire lock:
 ((&(&cp->cp_send_w)->work)){+.+.}, at: [<ffffffff81367998>] flush_work+0x88/0x770 kernel/workqueue.c:2887

but task is already holding lock:
 (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff869c6841>] lock_sock include/net/sock.h:1473 [inline]
 (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff869c6841>] rds_tcp_reset_callbacks+0x181/0x450 net/rds/tcp.c:165

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (k-sk_lock-AF_INET){+.+.}:
       lock_sock_nested+0xb7/0x100 net/core/sock.c:2813
       lock_sock include/net/sock.h:1473 [inline]
       do_tcp_setsockopt.constprop.0+0xfb/0x1c10 net/ipv4/tcp.c:2564
       tcp_setsockopt net/ipv4/tcp.c:2832 [inline]
       tcp_setsockopt+0xa7/0xc0 net/ipv4/tcp.c:2824
       kernel_setsockopt+0xfb/0x1b0 net/socket.c:3396
       rds_tcp_cork net/rds/tcp_send.c:43 [inline]
       rds_tcp_xmit_path_prepare+0xaf/0xe0 net/rds/tcp_send.c:50
       rds_send_xmit+0x1ae/0x1c00 net/rds/send.c:187
       rds_send_worker+0x6d/0x240 net/rds/threads.c:189
       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

-> #0 ((&(&cp->cp_send_w)->work)){+.+.}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       flush_work+0xad/0x770 kernel/workqueue.c:2890
       __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965
       rds_tcp_reset_callbacks+0x18d/0x450 net/rds/tcp.c:167
       rds_tcp_accept_one+0x61a/0x8b0 net/rds/tcp_listen.c:194
       rds_tcp_accept_worker+0x4d/0x70 net/rds/tcp.c:407
       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(k-sk_lock-AF_INET);
                               lock((&(&cp->cp_send_w)->work));
                               lock(k-sk_lock-AF_INET);
  lock((&(&cp->cp_send_w)->work));

 *** DEADLOCK ***

4 locks held by kworker/u4:0/5:
 #0:  ("%s""krdsd"){+.+.}, at: [<ffffffff81364eb0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  ((&rtn->rds_tcp_accept_w)){+.+.}, at: [<ffffffff81364ee6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
 #2:  (&tc->t_conn_path_lock){+.+.}, at: [<ffffffff869c8632>] rds_tcp_accept_one+0x502/0x8b0 net/rds/tcp_listen.c:186
 #3:  (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff869c6841>] lock_sock include/net/sock.h:1473 [inline]
 #3:  (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff869c6841>] rds_tcp_reset_callbacks+0x181/0x450 net/rds/tcp.c:165

stack backtrace:
CPU: 0 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.291-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: krdsd rds_tcp_accept_worker
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
 flush_work+0xad/0x770 kernel/workqueue.c:2890
 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965
 rds_tcp_reset_callbacks+0x18d/0x450 net/rds/tcp.c:167
 rds_tcp_accept_one+0x61a/0x8b0 net/rds/tcp_listen.c:194
 rds_tcp_accept_worker+0x4d/0x70 net/rds/tcp.c:407
 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
Unable to determine destination address.
Unable to determine destination address.
Unable to determine destination address.
Unable to determine destination address.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
sctp: [Deprecated]: syz-executor.0 (pid 9896) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
sctp: [Deprecated]: syz-executor.0 (pid 9932) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
sctp: [Deprecated]: syz-executor.4 (pid 9937) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
sctp: [Deprecated]: syz-executor.0 (pid 9965) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
sctp: [Deprecated]: syz-executor.4 (pid 9970) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
sctp: [Deprecated]: syz-executor.0 (pid 9992) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
sctp: [Deprecated]: syz-executor.4 (pid 9990) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
Bluetooth: hci3 command 0x1407 tx timeout
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: missing 'lowerdir'
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
A link change request failed with some changes committed already. Interface ipvlan0 may have been left with an inconsistent configuration, please check.
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
syz-executor.4 (10219) used greatest stack depth: 24664 bytes left
sd 0:0:1:0: Add. Sense: Invalid command operation code
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
Bluetooth: hci3 command 0x1407 tx timeout
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
A link change request failed with some changes committed already. Interface ipvlan0 may have been left with an inconsistent configuration, please check.
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
A link change request failed with some changes committed already. Interface ipvlan0 may have been left with an inconsistent configuration, please check.
A link change request failed with some changes committed already. Interface ipvlan0 may have been left with an inconsistent configuration, please check.
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
audit: type=1800 audit(1661537755.316:2): pid=10366 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13941 res=0
sd 0:0:1:0: PR command failed: 134217730
audit: type=1800 audit(1661537755.536:3): pid=10372 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="SYSV00000000" dev="hugetlbfs" ino=0 res=0
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
sd 0:0:1:0: PR command failed: 134217730
sd 0:0:1:0: Sense Key : Illegal Request [current] 
sd 0:0:1:0: Add. Sense: Invalid command operation code
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
encrypted_key: keylen parameter is missing
audit: type=1800 audit(1661537756.156:4): pid=10462 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13986 res=0
Zero length message leads to an empty skb
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
Bluetooth: hci3 command 0x1407 tx timeout
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
audit: type=1800 audit(1661537757.066:5): pid=10530 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=14010 res=0
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
audit: type=1800 audit(1661537758.166:6): pid=10574 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=14028 res=0
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
Bluetooth: hci3 command 0x1407 tx timeout
overlayfs: fs on './file0' does not support file handles, falling back to index=off.