================================ WARNING: inconsistent lock state 5.5.0-rc6-next-20200116-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.3/10296 [HC0[0]:SC1[1]:HE1:SE0] takes: ffffffff8a03ce58 (ima_keys_lock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffffffff8a03ce58 (ima_keys_lock){+.?.}, at: ima_process_queued_keys+0x4f/0x320 security/integrity/ima/ima_asymmetric_keys.c:144 {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] ima_queue_key security/integrity/ima/ima_asymmetric_keys.c:111 [inline] ima_post_key_create_or_update+0x234/0x470 security/integrity/ima/ima_asymmetric_keys.c:194 key_create_or_update+0x6b8/0xcb0 security/keys/key.c:944 load_system_certificate_list+0x1ba/0x25e certs/system_keyring.c:161 do_one_initcall+0x120/0x820 init/main.c:1109 do_initcall_level init/main.c:1182 [inline] do_initcalls init/main.c:1198 [inline] do_basic_setup init/main.c:1218 [inline] kernel_init_freeable+0x522/0x5d0 init/main.c:1402 kernel_init+0x12/0x1bf init/main.c:1309 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 irq event stamp: 1405672 hardirqs last enabled at (1405672): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (1405671): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (1402718): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319 softirqs last disabled at (1403395): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (1403395): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(ima_keys_lock); lock(ima_keys_lock); *** DEADLOCK *** 3 locks held by syz-executor.3/10296: #0: ffffffff8a73bd48 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x27b/0x5a0 net/core/net_namespace.c:464 #1: ffffffff89bb0400 (rcu_read_lock){....}, at: __read_once_size include/linux/compiler.h:232 [inline] #1: ffffffff89bb0400 (rcu_read_lock){....}, at: inet_twsk_purge+0xe7/0x7e0 net/ipv4/inet_timewait_sock.c:270 #2: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline] #2: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394 stack backtrace: CPU: 0 PID: 10296 Comm: syz-executor.3 Not tainted 5.5.0-rc6-next-20200116-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] ima_process_queued_keys+0x4f/0x320 security/integrity/ima/ima_asymmetric_keys.c:144 ima_timer_handler+0x15/0x20 security/integrity/ima/ima_asymmetric_keys.c:46 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786 __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:__atomic_check_read include/asm-generic/atomic-instrumented.h:27 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:40 [inline] RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0x40/0xb0 kernel/rcu/tree.c:302 Code: 02 48 ba 00 00 00 00 00 fc ff df 89 c0 48 8d 3c c5 60 c1 7c 89 48 89 f9 48 c1 e9 03 80 3c 11 00 75 63 48 03 1c c5 60 c1 7c 89 04 00 00 00 4c 8d a3 d8 00 00 00 4c 89 e7 e8 4c e2 51 00 4c 89 RSP: 0018:ffffc900053cf808 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8880ae8382c0 RCX: 1ffffffff12f982c RDX: dffffc0000000000 RSI: ffffffff83a43eb3 RDI: ffffffff897cc160 RBP: ffffc900053cf820 R08: ffff88808e4d4040 R09: fffffbfff16a51a5 R10: ffff88808e4d4908 R11: ffff88808e4d4040 R12: 0000000000000001 R13: 000000000000aa40 R14: 0000000000000002 R15: dffffc0000000000 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:926 rcu_read_lock include/linux/rcupdate.h:602 [inline] inet_twsk_purge+0x61c/0x7e0 net/ipv4/inet_timewait_sock.c:268 tcp_sk_exit_batch+0x22/0xb0 net/ipv4/tcp_ipv4.c:2806 ops_exit_list.isra.0+0x10c/0x160 net/core/net_namespace.c:175 setup_net+0x546/0x8b0 net/core/net_namespace.c:350 copy_net_ns+0x29e/0x5a0 net/core/net_namespace.c:468 create_new_namespaces+0x403/0xb50 kernel/nsproxy.c:108 copy_namespaces+0x3a5/0x4a0 kernel/nsproxy.c:177 copy_process+0x29ee/0x7290 kernel/fork.c:2084 _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:00007fb0e9b95c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb0e9b966d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000068002100 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000070 R14: 00000000004c1c24 R15: 000000000075bf2c