kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 31733 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180921+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88018a83f9a8 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019026a200 RCX: 1ffff10031a4cc77 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88018a83fb80 R08: ffff8801b9340480 R09: fffff52000375a47 R10: fffff52000375a47 R11: ffffc90001bad23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff8801b9340480 FS: 00007f766e9e7700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f766e9e50b8 CR3: 00000001d3ee0000 CR4: 00000000001426e0 Call Trace: preempt_schedule_irq+0x87/0x110 kernel/sched/core.c:3706 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:slab_alloc mm/slab.c:3385 [inline] RIP: 0010:kmem_cache_alloc+0x297/0x730 mm/slab.c:3552 Code: 7e 0f 85 cf fe ff ff e8 46 0d 40 ff e9 c5 fe ff ff e8 1d f7 c2 ff 48 83 3d d5 b3 b1 07 00 0f 84 3b 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 e9 54 fe ff ff 31 d2 be a5 01 00 00 48 c7 c7 d2 f7 RSP: 0018:ffff88018a83fc70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 00000000006000c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff88018a83fcd8 R08: ffff8801b9340480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c3cf6e00 R13: ffff8801da989e00 R14: ffff8801da989e00 R15: 00000000006000c0 getname_flags+0xd0/0x590 fs/namei.c:140 getname+0x19/0x20 fs/namei.c:211 do_sys_open+0x383/0x700 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4112d1 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 b4 17 00 00 c3 48 83 ec 08 e8 8a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 d3 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f766e9e5090 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f766e9e5830 RCX: 00000000004112d1 RDX: 0104007000009120 RSI: 0000000000000002 RDI: 00000000004bce59 RBP: 0000000000000000 R08: 0000000000000090 R09: 00000000000000a8 R10: 00000000000000b3 R11: 0000000000000293 R12: 0000000000000070 R13: 0000000020000000 R14: 00000000004c49c2 R15: 0000000000000000 Modules linked in: ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc4-next-20180921+ #77 Not tainted ------------------------------------------------------ syz-executor2/31733 is trying to acquire lock: 000000002b1fb60d ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 00000000aef8afb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1125 [inline] 00000000aef8afb9 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3417 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1125 [inline] task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9674 sched_fork+0x443/0xba0 kernel/sched/core.c:2358 copy_process+0x2585/0x8780 kernel/fork.c:1887 _do_fork+0x1cb/0x11c0 kernel/fork.c:2216 kernel_thread+0x34/0x40 kernel/fork.c:2275 rest_init+0x22/0xe5 init/main.c:408 start_kernel+0x8bc/0x8f7 init/main.c:739 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 try_to_wake_up+0xd2/0x12f0 kernel/sched/core.c:1964 wake_up_process+0x10/0x20 kernel/sched/core.c:2128 __up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262 up+0x13c/0x1c0 kernel/locking/semaphore.c:187 __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:243 console_unlock+0x80c/0x1150 kernel/printk/printk.c:2426 vprintk_emit+0x33d/0x930 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 load_umh+0x51/0xbd net/bpfilter/bpfilter_kern.c:98 do_one_initcall+0x140/0x956 init/main.c:885 do_initcall_level init/main.c:953 [inline] do_initcalls init/main.c:961 [inline] do_basic_setup init/main.c:979 [inline] kernel_init_freeable+0x4bb/0x5ae init/main.c:1144 kernel_init+0x11/0x1b2 init/main.c:1063 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:226 console_trylock+0x15/0xa0 kernel/printk/printk.c:2244 console_trylock_spinning kernel/printk/printk.c:1648 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1920 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:250 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193 notify_die+0x1bd/0x2d0 kernel/notifier.c:549 do_general_protection+0x25b/0x340 arch/x86/kernel/traps.c:573 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1138 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] prepare_task_switch kernel/sched/core.c:2616 [inline] context_switch kernel/sched/core.c:2795 [inline] __schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 preempt_schedule_irq+0x87/0x110 kernel/sched/core.c:3706 retint_kernel+0x1b/0x2d arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] slab_alloc mm/slab.c:3385 [inline] kmem_cache_alloc+0x297/0x730 mm/slab.c:3552 getname_flags+0xd0/0x590 fs/namei.c:140 getname+0x19/0x20 fs/namei.c:211 do_sys_open+0x383/0x700 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz-executor2/31733: #0: 00000000aef8afb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1125 [inline] #0: 00000000aef8afb9 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3417 #1: 0000000028d06fac (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329 stack backtrace: CPU: 1 PID: 31733 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180921+ #77 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+0x1d3/0x2c4 lib/dump_stack.c:113 print_circular_bug.isra.33.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x33e4/0x4ec0 kernel/locking/lockdep.c:3411 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:226 console_trylock+0x15/0xa0 kernel/printk/printk.c:2244 console_trylock_spinning kernel/printk/printk.c:1648 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1920 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:250 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193 notify_die+0x1bd/0x2d0 kernel/notifier.c:549 do_general_protection+0x25b/0x340 arch/x86/kernel/traps.c:573 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1138 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88018a83f9a8 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019026a200 RCX: 1ffff10031a4cc77 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88018a83fb80 R08: ffff8801b9340480 R09: fffff52000375a47 R10: fffff52000375a47 R11: ffffc90001bad23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff8801b9340480 preempt_schedule_irq+0x87/0x110 kernel/sched/core.c:3706 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:slab_alloc mm/slab.c:3385 [inline] RIP: 0010:kmem_cache_alloc+0x297/0x730 mm/slab.c:3552 Code: 7e 0f 85 cf fe ff ff e8 46 0d 40 ff e9 c5 fe ff ff e8 1d f7 c2 ff 48 83 3d d5 b3 b1 07 00 0f 84 3b 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 e9 54 fe ff ff 31 d2 be a5 01 00 00 48 c7 c7 d2 f7 RSP: 0018:ffff88018a83fc70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 00000000006000c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff88018a83fcd8 R08: ffff8801b9340480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c3cf6e00 R13: ffff8801da989e00 R14: ffff8801da989e00 R15: 00000000006000c0 getname_flags+0xd0/0x590 fs/namei.c:140 getname+0x19/0x20 fs/namei.c:211 do_sys_open+0x383/0x700 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4112d1 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 b4 17 00 00 c3 48 83 ec 08 e8 8a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 d3 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f766e9e5090 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f766e9e5830 RCX: 0000000000411 Lost 4 message(s)! ---[ end trace 5886dabeec7e5793 ]--- RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88018a83f9a8 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019026a200 RCX: 1ffff10031a4cc77 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88018a83fb80 R08: ffff8801b9340480 R09: fffff52000375a47 R10: fffff52000375a47 R11: ffffc90001bad23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff8801b9340480 FS: 00007f766e9e7700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f766e9e50b8 CR3: 00000001d3ee0000 CR4: 00000000001426e0