block nbd4: Receive control failed (result -22)
block nbd4: shutting down sockets
============================================
WARNING: possible recursive locking detected
4.19.80 #0 Not tainted
--------------------------------------------
kworker/u5:1/8224 is trying to acquire lock:
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: flush_workqueue+0xf7/0x14b0 kernel/workqueue.c:2652
but task is already holding lock:
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock((wq_completion)"knbd%d-recv"nbd->index);
lock((wq_completion)"knbd%d-recv"nbd->index);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by kworker/u5:1/8224:
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: 000000007b22e084 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124
#1: 00000000459f9595 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128
#2: 000000007f0bb026 (&nbd->config_lock){+.+.}, at: refcount_dec_and_mutex_lock lib/refcount.c:311 [inline]
#2: 000000007f0bb026 (&nbd->config_lock){+.+.}, at: refcount_dec_and_mutex_lock+0x56/0x90 lib/refcount.c:306
stack backtrace:
CPU: 1 PID: 8224 Comm: kworker/u5:1 Not tainted 4.19.80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: knbd4-recv recv_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_deadlock_bug kernel/locking/lockdep.c:1759 [inline]
check_deadlock kernel/locking/lockdep.c:1803 [inline]
validate_chain kernel/locking/lockdep.c:2399 [inline]
__lock_acquire.cold+0x20f/0x4a7 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
flush_workqueue+0x126/0x14b0 kernel/workqueue.c:2655
drain_workqueue+0x1b4/0x470 kernel/workqueue.c:2820
destroy_workqueue+0x21/0x6b0 kernel/workqueue.c:4158
nbd_config_put+0x3cf/0x860 drivers/block/nbd.c:1132
recv_work+0x19b/0x200 drivers/block/nbd.c:740
process_one_work+0x989/0x1750 kernel/workqueue.c:2153
worker_thread+0x98/0xe40 kernel/workqueue.c:2296
kthread+0x354/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
kobject: 'loop1' (00000000ed1e4b23): kobject_uevent_env
kobject: 'loop1' (00000000ed1e4b23): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000096c35d3e): kobject_uevent_env
kobject: 'loop2' (0000000096c35d3e): fill_kobj_path: path = '/devices/virtual/block/loop2'
netlink: 'syz-executor.3': attribute type 2 has an invalid length.
kobject: 'loop0' (0000000075bee5ea): kobject_uevent_env
kobject: 'loop0' (0000000075bee5ea): fill_kobj_path: path = '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option ";Ì·-†u ¬¸p" or missing value
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead.
TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters.
kobject: 'loop2' (0000000096c35d3e): kobject_uevent_env
kobject: 'loop2' (0000000096c35d3e): fill_kobj_path: path = '/devices/virtual/block/loop2'
audit: type=1804 audit(1572238871.517:56): pid=8262 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir978770137/syzkaller.b7Owe0/19/bus" dev="sda1" ino=16606 res=1
overlayfs: unrecognized mount option ";Ì·-†u ¬¸p" or missing value
kobject: 'loop3' (000000009f250bac): kobject_uevent_env
kobject: 'loop3' (000000009f250bac): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (000000000a7cc420): kobject_uevent_env
kobject: 'loop5' (000000000a7cc420): fill_kobj_path: path = '/devices/virtual/block/loop5'
netlink: 'syz-executor.3': attribute type 2 has an invalid length.
kobject: 'loop2' (0000000096c35d3e): kobject_uevent_env
TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters.
kobject: 'loop2' (0000000096c35d3e): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000075bee5ea): kobject_uevent_env
kobject: 'loop0' (0000000075bee5ea): fill_kobj_path: path = '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option ";Ì·-†u ¬¸p" or missing value
kobject: 'loop1' (00000000ed1e4b23): kobject_uevent_env
kobject: 'loop1' (00000000ed1e4b23): fill_kobj_path: path = '/devices/virtual/block/loop1'
audit: type=1804 audit(1572238871.987:57): pid=8284 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir978770137/syzkaller.b7Owe0/20/bus" dev="sda1" ino=16597 res=1
kobject: 'loop2' (0000000096c35d3e): kobject_uevent_env
kobject: 'loop2' (0000000096c35d3e): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000075bee5ea): kobject_uevent_env
kobject: 'loop0' (0000000075bee5ea): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (000000009f250bac): kobject_uevent_env
kobject: 'loop3' (000000009f250bac): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (00000000ed1e4b23): kobject_uevent_env
kobject: 'loop1' (00000000ed1e4b23): fill_kobj_path: path = '/devices/virtual/block/loop1'