batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
======================================================
WARNING: possible circular locking dependency detected
4.14.171-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:14/8080 is trying to acquire lock:
((&(&cp->cp_send_w)->work)){+.+.}, at: [<ffffffff813c5de4>] flush_work+0x84/0x730 kernel/workqueue.c:2884
but task is already holding lock:
(k-sk_lock-AF_INET){+.+.}, at: [<ffffffff85fda7ed>] lock_sock include/net/sock.h:1467 [inline]
(k-sk_lock-AF_INET){+.+.}, at: [<ffffffff85fda7ed>] rds_tcp_reset_callbacks+0x18d/0x4a0 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_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
lock_sock_nested+0xbd/0x110 net/core/sock.c:2770
lock_sock include/net/sock.h:1467 [inline]
do_tcp_setsockopt.isra.0+0x11a/0x1e10 net/ipv4/tcp.c:2557
tcp_setsockopt+0xb3/0xd0 net/ipv4/tcp.c:2828
sock_common_setsockopt+0x94/0xd0 net/core/sock.c:2968
kernel_setsockopt+0x104/0x1d0 net/socket.c:3396
rds_tcp_cork net/rds/tcp_send.c:43 [inline]
rds_tcp_xmit_path_prepare+0xba/0xf0 net/rds/tcp_send.c:50
rds_send_xmit+0x1b2/0x1cd0 net/rds/send.c:187
rds_send_worker+0x73/0x250 net/rds/threads.c:189
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #0 ((&(&cp->cp_send_w)->work)){+.+.}:
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
flush_work+0xae/0x730 kernel/workqueue.c:2887
__cancel_work_timer+0x2f0/0x480 kernel/workqueue.c:2962
cancel_delayed_work_sync+0x1b/0x20 kernel/workqueue.c:3082
rds_tcp_reset_callbacks+0x19a/0x4a0 net/rds/tcp.c:167
rds_tcp_accept_one+0x682/0xa10 net/rds/tcp_listen.c:194
rds_tcp_accept_worker+0x53/0x70 net/rds/tcp.c:407
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 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/u4:14/8080:
#0: ("%s""krdsd"){+.+.}, at: [<ffffffff813cd58e>] work_static include/linux/workqueue.h:199 [inline]
#0: ("%s""krdsd"){+.+.}, at: [<ffffffff813cd58e>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("%s""krdsd"){+.+.}, at: [<ffffffff813cd58e>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("%s""krdsd"){+.+.}, at: [<ffffffff813cd58e>] process_one_work+0x76e/0x1600 kernel/workqueue.c:2085
#1: ((&rtn->rds_tcp_accept_w)){+.+.}, at: [<ffffffff813cd5cb>] process_one_work+0x7ab/0x1600 kernel/workqueue.c:2089
#2: (&tc->t_conn_path_lock){+.+.}, at: [<ffffffff85fdc8c8>] rds_tcp_accept_one+0x548/0xa10 net/rds/tcp_listen.c:186
#3: (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff85fda7ed>] lock_sock include/net/sock.h:1467 [inline]
#3: (k-sk_lock-AF_INET){+.+.}, at: [<ffffffff85fda7ed>] rds_tcp_reset_callbacks+0x18d/0x4a0 net/rds/tcp.c:165
stack backtrace:
CPU: 0 PID: 8080 Comm: kworker/u4:14 Not tainted 4.14.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_tcp_accept_worker
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x142/0x197 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
flush_work+0xae/0x730 kernel/workqueue.c:2887
__cancel_work_timer+0x2f0/0x480 kernel/workqueue.c:2962
cancel_delayed_work_sync+0x1b/0x20 kernel/workqueue.c:3082
rds_tcp_reset_callbacks+0x19a/0x4a0 net/rds/tcp.c:167
rds_tcp_accept_one+0x682/0xa10 net/rds/tcp_listen.c:194
rds_tcp_accept_worker+0x53/0x70 net/rds/tcp.c:407
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404