kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access kobject: 'kvm' (00000000025e8415): kobject_uevent_env general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12380 Comm: syz-executor1 Not tainted 4.19.0-rc4+ #150 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:2497 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2505 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2611 [inline] RIP: 0010:context_switch kernel/sched/core.c:2790 [inline] RIP: 0010:__schedule+0xfb7/0x1ed0 kernel/sched/core.c:3473 kobject: 'kvm' (00000000025e8415): kobject_uevent_env Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 b9 09 00 00 4d 8b 24 24 4d 85 e4 0f 84 0b f7 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 8d ed 03 fa eb 9d 48 89 de 4c 89 ff e8 d0 RSP: 0018:ffff8801bd217238 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019176a680 RCX: 1ffff1003288590f RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff8801bd217410 R08: ffff880198c165c0 R09: fffff52001cd2647 R10: fffff52001cd2647 R11: ffffc9000e69323b R12: dead000000000100 kobject: 'kvm' (00000000025e8415): fill_kobj_path: path = '/devices/virtual/misc/kvm' R13: dffffc0000000000 R14: ffff8801dae2cb40 R15: ffff880198c165c0 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5f34b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f41919b7518 CR3: 00000001ce460000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3597 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3623 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184 try_to_wake_up+0x10a/0x12f0 kernel/sched/core.c:2055 wake_up_process kernel/sched/core.c:2123 [inline] wake_up_q+0xa4/0x100 kernel/sched/core.c:441 futex_wake+0x61f/0x760 kernel/futex.c:1556 do_futex+0x2e4/0x26d0 kernel/futex.c:3533 __do_compat_sys_futex kernel/futex_compat.c:201 [inline] __se_compat_sys_futex kernel/futex_compat.c:175 [inline] __ia32_compat_sys_futex+0x3d9/0x5f0 kernel/futex_compat.c:175 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f38ca9 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5f3412c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: ffffffffffffffda RBX: 000000000814af6c RCX: 0000000000000081 RDX: 000000000814af68 RSI: 000000000814af60 RDI: 000000000814af6c RBP: 00000000f5f34228 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc4+ #150 Not tainted ------------------------------------------------------ syz-executor1/12380 is trying to acquire lock: 0000000075cf8740 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 00000000601b415d (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] 00000000601b415d (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 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:1821 [inline] task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9581 sched_fork+0x443/0xba0 kernel/sched/core.c:2353 copy_process+0x2586/0x8780 kernel/fork.c:1839 _do_fork+0x1cb/0x11d0 kernel/fork.c:2166 kernel_thread+0x34/0x40 kernel/fork.c:2225 rest_init+0x22/0xe5 init/main.c:408 start_kernel+0x8f4/0x92f 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:1960 wake_up_process+0x10/0x20 kernel/sched/core.c:2123 __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:244 console_unlock+0x814/0x1160 kernel/printk/printk.c:2427 vprintk_emit+0x33d/0x930 kernel/printk/printk.c:1922 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1996 load_umh+0x51/0xbd net/bpfilter/bpfilter_kern.c:98 do_one_initcall+0x145/0x957 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:413 -> #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:227 console_trylock+0x15/0xa0 kernel/printk/printk.c:2245 console_trylock_spinning kernel/printk/printk.c:1649 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1996 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:251 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+0x248/0x2f0 arch/x86/kernel/traps.c:559 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1160 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2497 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2505 [inline] prepare_task_switch kernel/sched/core.c:2611 [inline] context_switch kernel/sched/core.c:2790 [inline] __schedule+0xfb7/0x1ed0 kernel/sched/core.c:3473 preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3597 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3623 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184 try_to_wake_up+0x10a/0x12f0 kernel/sched/core.c:2055 wake_up_process kernel/sched/core.c:2123 [inline] wake_up_q+0xa4/0x100 kernel/sched/core.c:441 futex_wake+0x61f/0x760 kernel/futex.c:1556 do_futex+0x2e4/0x26d0 kernel/futex.c:3533 __do_compat_sys_futex kernel/futex_compat.c:201 [inline] __se_compat_sys_futex kernel/futex_compat.c:175 [inline] __ia32_compat_sys_futex+0x3d9/0x5f0 kernel/futex_compat.c:175 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 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-executor1/12380: #0: 00000000601b415d (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] #0: 00000000601b415d (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 #1: 0000000085019df3 (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329 stack backtrace: CPU: 0 PID: 12380 Comm: syz-executor1 Not tainted 4.19.0-rc4+ #150 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+0x1c4/0x2b4 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:227 console_trylock+0x15/0xa0 kernel/printk/printk.c:2245 console_trylock_spinning kernel/printk/printk.c:1649 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1996 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:251 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+0x248/0x2f0 arch/x86/kernel/traps.c:559 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2497 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2505 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2611 [inline] RIP: 0010:context_switch kernel/sched/core.c:2790 [inline] RIP: 0010:__schedule+0xfb7/0x1ed0 kernel/sched/core.c:3473 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 b9 09 00 00 4d 8b 24 24 4d 85 e4 0f 84 0b f7 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 8d ed 03 fa eb 9d 48 89 de 4c 89 ff e8 d0 RSP: 0018:ffff8801bd217238 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019176a680 RCX: 1ffff1003288590f RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff8801bd217410 R08: ffff880198c165c0 R09: fffff52001cd2647 R10: fffff52001cd2647 R11: ffffc9000e69323b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dae2cb40 R15: ffff880198c165c0 preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3597 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3623 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184 try_to_wake_up+0x10a/0x12f0 kernel/sched/core.c:2055 wake_up_process kernel/sched/core.c:2123 [inline] wake_up_q+0xa4/0x100 kernel/sched/core.c:441 futex_wake+0x61f/0x760 kernel/futex.c:1556 do_futex+0x2e4/0x26d0 kernel/futex.c:3533 __ia32_compat_sys_fute Lost 26 message(s)! ---[ end trace 3a6b71b7e2f35a4c ]--- RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2497 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2505 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2611 [inline] RIP: 0010:context_switch kernel/sched/core.c:2790 [inline] RIP: 0010:__schedule+0xfb7/0x1ed0 kernel/sched/core.c:3473 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 b9 09 00 00 4d 8b 24 24 4d 85 e4 0f 84 0b f7 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 8d ed 03 fa eb 9d 48 89 de 4c 89 ff e8 d0 RSP: 0018:ffff8801bd217238 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff88019176a680 RCX: 1ffff1003288590f RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff8801bd217410 R08: ffff880198c165c0 R09: fffff52001cd2647 R10: fffff52001cd2647 R11: ffffc9000e69323b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dae2cb40 R15: ffff880198c165c0 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5f34b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f41919b7518 CR3: 00000001ce460000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400