================================ WARNING: inconsistent lock state 5.5.0-rc6-next-20200116-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor385/11111 [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: 654 hardirqs last enabled at (654): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (654): [] _raw_spin_unlock_irq+0x23/0x80 kernel/locking/spinlock.c:199 hardirqs last disabled at (653): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (653): [] _raw_spin_lock_irq+0x3a/0x80 kernel/locking/spinlock.c:167 softirqs last enabled at (0): [] copy_process+0x1ad2/0x7290 kernel/fork.c:2027 softirqs last disabled at (173): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (173): [] 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 *** 2 locks held by syz-executor385/11111: #0: ffffffff89bb0400 (rcu_read_lock){....}, at: get_pid_task+0x0/0x210 include/linux/refcount.h:193 #1: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline] #1: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394 stack backtrace: CPU: 0 PID: 11111 Comm: syz-executor385 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4487 Code: 9c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d 49 7d 58 08 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffffc90009327838 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff136774f RBX: ffff88808da9a3c0 RCX: ffffffff815ae240 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc90009327880 R08: 1ffffffff16a51a4 R09: fffffbfff16a51a5 R10: ffff88808da9ac60 R11: ffff88808da9a3c0 R12: ffffffff89bb0400 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:601 [inline] get_pid_task+0x3e/0x210 kernel/pid.c:426 get_proc_task fs/proc/internal.h:124 [inline] proc_pid_permission+0x92/0x2f0 fs/proc/base.c:717 do_inode_permission fs/namei.c:384 [inline] inode_permission+0x36b/0x520 fs/namei.c:449 may_lookup fs/namei.c:1787 [inline] link_path_walk.part.0+0xa28/0x1370 fs/namei.c:2183 link_path_walk fs/namei.c:2171 [inline] path_openat+0x1f9/0x34d0 fs/namei.c:3603 do_filp_open+0x192/0x260 fs/namei.c:3634 do_sys_openat2+0x633/0x840 fs/open.c:1151 do_sys_open+0xfc/0x190 fs/open.c:1167 ksys_open include/linux/syscalls.h:1387 [inline] __do_sys_open fs/open.c:1173 [inline] __se_sys_open fs/open.c:1171 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1171 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x400fc0 Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 0d 17 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 RSP: 002b:00007ffc4b90b3c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc4b90b3f4 RCX: 0000000000400fc0 RDX: 00007ffc4b90b3fa RSI: 0000000000080001 RDI: 00000000004a21e2 RBP: 00007ffc4b90b3f0 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000