================================ WARNING: inconsistent lock state 5.5.0-next-20200207-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/10703 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880a7cc31c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff8880a7cc31c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff8880a7cc31c8 (&(&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: 15490 hardirqs last enabled at (15490): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (15489): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (13542): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319 softirqs last disabled at (15303): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (15303): [] 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 *** 6 locks held by syz-executor.2/10703: #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: ffff88805af0c1d8 (&mm->mmap_sem#2){++++}, at: dup_mmap kernel/fork.c:491 [inline] #1: ffff88805af0c1d8 (&mm->mmap_sem#2){++++}, at: dup_mm+0x120/0x1430 kernel/fork.c:1360 #2: ffff8880a39f68d8 (&mm->mmap_sem/1){+.+.}, at: dup_mmap kernel/fork.c:500 [inline] #2: ffff8880a39f68d8 (&mm->mmap_sem/1){+.+.}, at: dup_mm+0x165/0x1430 kernel/fork.c:1360 #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pte_range mm/memory.c:816 [inline] #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pmd_range mm/memory.c:892 [inline] #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_pud_range mm/memory.c:926 [inline] #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_p4d_range mm/memory.c:948 [inline] #3: ffff8880a201f960 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: copy_page_range+0xb0e/0x20e0 mm/memory.c:1010 #4: ffff88809d560ac0 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pte_range mm/memory.c:821 [inline] #4: ffff88809d560ac0 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pmd_range mm/memory.c:892 [inline] #4: ffff88809d560ac0 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_pud_range mm/memory.c:926 [inline] #4: ffff88809d560ac0 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_p4d_range mm/memory.c:948 [inline] #4: ffff88809d560ac0 (&(ptlock_ptr(page))->rlock#2/1){+.+.}, at: copy_page_range+0xb99/0x20e0 mm/memory.c:1010 #5: ffffffff89bac640 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #5: ffffffff89bac640 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 10703 Comm: syz-executor.2 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:write_comp_data+0x1e/0x70 kernel/kcov.c:208 Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 65 8b 05 18 7b 8c 7e a9 00 01 1f 00 75 51 41 8b 80 88 13 00 00 <83> f8 03 75 45 49 8b 80 90 13 00 00 45 8b 80 8c 13 00 00 4c 8b 08 RSP: 0018:ffffc900061ef7f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffffea0001823db4 RCX: ffffffff81a384a2 RDX: 0000000000000085 RSI: 000000000000007f RDI: 0000000000000005 RBP: ffffc900061ef800 R08: ffff888050854380 R09: fffff940003047b7 R10: fffff940003047b6 R11: ffffea0001823db7 R12: ffffea0001823d80 R13: 0000000000000085 R14: dffffc0000000000 R15: 80000000608f6007 get_page+0xa2/0x100 include/linux/mm.h:1000 copy_one_pte mm/memory.c:790 [inline] copy_pte_range mm/memory.c:841 [inline] copy_pmd_range mm/memory.c:892 [inline] copy_pud_range mm/memory.c:926 [inline] copy_p4d_range mm/memory.c:948 [inline] copy_page_range+0xd57/0x20e0 mm/memory.c:1010 dup_mmap kernel/fork.c:604 [inline] dup_mm+0xa67/0x1430 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: 0033:0x45b399 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8212183c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f82121846d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000070 R14: 00000000004c1c24 R15: 000000000075bf2c