================================ WARNING: inconsistent lock state 5.5.0-next-20200207-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. udevd/9721 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88808cb189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff88808cb189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff88808cb189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:304 [inline] rxrpc_connect_call+0x358/0x4e30 net/rxrpc/conn_client.c:701 rxrpc_new_client_call+0x9c0/0x1ad0 net/rxrpc/call_object.c:290 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:595 [inline] rxrpc_do_sendmsg+0xffa/0x1d5f net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:586 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x358/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2487 __do_sys_sendmmsg net/socket.c:2516 [inline] __se_sys_sendmmsg net/socket.c:2513 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2513 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 1108296 hardirqs last enabled at (1108296): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (1108296): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (1108295): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1108295): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (1107846): [] memcpy include/linux/string.h:426 [inline] softirqs last enabled at (1107846): [] fpu__copy+0x17e/0x8c0 arch/x86/kernel/fpu/core.c:195 softirqs last disabled at (1108203): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (1108203): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 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 *** 4 locks held by udevd/9721: #0: ffffffff89c212d0 (dup_mmap_sem.rw_sem){.+.+}, at: dup_mmap kernel/fork.c:490 [inline] #0: ffffffff89c212d0 (dup_mmap_sem.rw_sem){.+.+}, at: dup_mm+0x104/0x1430 kernel/fork.c:1360 #1: ffff88809f5144d8 (&mm->mmap_sem#2){++++}, at: dup_mmap kernel/fork.c:491 [inline] #1: ffff88809f5144d8 (&mm->mmap_sem#2){++++}, at: dup_mm+0x120/0x1430 kernel/fork.c:1360 #2: ffff88804bb168d8 (&mm->mmap_sem/1){+.+.}, at: dup_mmap kernel/fork.c:500 [inline] #2: ffff88804bb168d8 (&mm->mmap_sem/1){+.+.}, at: dup_mm+0x165/0x1430 kernel/fork.c:1360 #3: ffffffff89bac640 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #3: ffffffff89bac640 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 9721 Comm: udevd Not tainted 5.5.0-next-20200207-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+0x197/0x210 lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100 valid_state kernel/locking/lockdep.c:3111 [inline] mark_lock_irq kernel/locking/lockdep.c:3308 [inline] mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665 mark_usage kernel/locking/lockdep.c:3565 [inline] __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 rxrpc_put_connection net/rxrpc/ar-internal.h:965 [inline] rxrpc_rcu_destroy_call+0xbd/0x200 net/rxrpc/call_object.c:572 rcu_do_batch kernel/rcu/tree.c:2186 [inline] rcu_core+0x5e1/0x1390 kernel/rcu/tree.c:2410 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2419 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:unwind_next_frame+0x30/0x50 arch/x86/kernel/unwind_frame.c:266 Code: 00 fc ff df 48 89 fa 55 48 c1 ea 03 48 89 e5 48 83 ec 08 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 0f 8b 17 <31> c0 85 d2 74 05 e8 a5 f5 ff ff c9 c3 48 89 7d f8 e8 ba 09 81 00 RSP: 0018:ffffc900056ef5f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: ffffffff81644aa0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff81b47d53 RDI: ffffc900056ef608 RBP: ffffc900056ef5f8 R08: 0000000000000001 R09: ffffc900056ef660 R10: ffffc900056ef630 R11: ffffc900056ef640 R12: ffffc900056ef6c0 R13: 0000000000000000 R14: ffff88809e93e000 R15: ffff88821bc46c40 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8f/0xc0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:523 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3484 vm_area_dup+0x21/0x170 kernel/fork.c:359 dup_mmap kernel/fork.c:544 [inline] dup_mm+0x549/0x1430 kernel/fork.c:1360 copy_mm kernel/fork.c:1416 [inline] copy_process+0x2987/0x7290 kernel/fork.c:2081 _do_fork+0x146/0x1090 kernel/fork.c:2430 __do_sys_clone kernel/fork.c:2585 [inline] __se_sys_clone kernel/fork.c:2566 [inline] __x64_sys_clone+0x19a/0x260 kernel/fork.c:2566 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f76024caf46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffd4461ad20 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd4461ad20 RCX: 00007f76024caf46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd4461ad80 R08: 00000000000025f9 R09: 00000000000025f9 R10: 00007f7602de7a70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd4461ad40 R14: 0000000000000005 R15: 0000000000000005