================================ WARNING: inconsistent lock state 4.19.106-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. ksoftirqd/1/18 [HC0[0]:SC1[1]:HE1:SE0] takes: 00000000f32bf504 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000f32bf504 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:949 [inline] 00000000f32bf504 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x666/0xc00 net/rxrpc/conn_client.c:1002 {SOFTIRQ-ON-W} state was registered at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:309 [inline] rxrpc_connect_call+0x301/0x4630 net/rxrpc/conn_client.c:702 rxrpc_new_client_call+0x8c6/0x1850 net/rxrpc/call_object.c:291 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:596 [inline] rxrpc_do_sendmsg+0xf2e/0x1bc1 net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4a8/0x5b0 net/rxrpc/af_rxrpc.c:593 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 913418 hardirqs last enabled at (913418): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (913418): [] _raw_spin_unlock_irqrestore+0x67/0xe0 kernel/locking/spinlock.c:184 hardirqs last disabled at (913417): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (913417): [] _raw_spin_lock_irqsave+0x66/0xbf kernel/locking/spinlock.c:152 softirqs last enabled at (912842): [] __do_softirq+0x650/0x93c kernel/softirq.c:318 softirqs last disabled at (912847): [] run_ksoftirqd kernel/softirq.c:653 [inline] softirqs last disabled at (912847): [] run_ksoftirqd+0x89/0x100 kernel/softirq.c:645 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&local->client_conns_lock)->rlock); lock(&(&local->client_conns_lock)->rlock); *** DEADLOCK *** 1 lock held by ksoftirqd/1/18: #0: 0000000060dd18a2 (rcu_callback){....}, at: __rcu_reclaim kernel/rcu/rcu.h:226 [inline] #0: 0000000060dd18a2 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2584 [inline] #0: 0000000060dd18a2 (rcu_callback){....}, at: invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] #0: 0000000060dd18a2 (rcu_callback){....}, at: __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] #0: 0000000060dd18a2 (rcu_callback){....}, at: rcu_process_callbacks+0xbff/0x17f0 kernel/rcu/tree.c:2881 stack backtrace: CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.106-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x425 kernel/locking/lockdep.c:2540 valid_state kernel/locking/lockdep.c:2553 [inline] mark_lock_irq kernel/locking/lockdep.c:2747 [inline] mark_lock+0xc71/0x11b0 kernel/locking/lockdep.c:3127 mark_irqflags kernel/locking/lockdep.c:3005 [inline] __lock_acquire+0xc62/0x49c0 kernel/locking/lockdep.c:3368 lock_acquire+0x170/0x400 kernel/locking/lockdep.c:3903 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:949 [inline] rxrpc_put_client_conn+0x666/0xc00 net/rxrpc/conn_client.c:1002 rxrpc_put_connection net/rxrpc/ar-internal.h:951 [inline] rxrpc_rcu_destroy_call+0xb6/0x1e0 net/rxrpc/call_object.c:657 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0xb2d/0x17f0 kernel/rcu/tree.c:2881 __do_softirq+0x26c/0x93c kernel/softirq.c:292 run_ksoftirqd kernel/softirq.c:653 [inline] run_ksoftirqd+0x89/0x100 kernel/softirq.c:645 smpboot_thread_fn+0x653/0x9d0 kernel/smpboot.c:164 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 block nbd2: Receive control failed (result -107) audit: type=1800 audit(1582782015.060:89): pid=10845 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="loop2" ino=8 res=0 block nbd2: shutting down sockets 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. hid-generic 0000:0000:0000.0001: ignoring exceeding usage max hid-generic 0000:0000:0000.0001: hidraw0: HID v0.00 Device [syz1] on sz1 block nbd2: Receive control failed (result -107) block nbd2: Attempted send on invalid socket block nbd2: shutting down sockets ldm_validate_partition_table(): Disk read failed. Dev nbd2: unable to read RDB block 0 hid-generic 0000:0000:0000.0002: ignoring exceeding usage max nbd2: unable to read partition table netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. hid-generic 0000:0000:0000.0002: hidraw0: HID v0.00 Device [syz1] on sz1 audit: type=1800 audit(1582782015.770:90): pid=10884 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="loop2" ino=9 res=0 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop4): unable to read superblock netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop4): unable to read superblock netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop1): unable to read superblock cgroup: fork rejected by pids controller in /syz4 EXT4-fs (loop1): VFS: Can't find ext4 filesystem print_req_error: 41 callbacks suppressed print_req_error: I/O error, dev loop1, sector 2 EXT4-fs (loop1): unable to read superblock EXT4-fs (loop1): VFS: Can't find ext4 filesystem print_req_error: I/O error, dev loop1, sector 2 EXT4-fs (loop1): unable to read superblock