hrtimer: interrupt took 164823 ns WARNING: CPU: 0 PID: 10956 at kernel/sched/deadline.c:628 setup_new_dl_entity kernel/sched/deadline.c:629 [inline] WARNING: CPU: 0 PID: 10956 at kernel/sched/deadline.c:628 enqueue_dl_entity kernel/sched/deadline.c:1429 [inline] WARNING: CPU: 0 PID: 10956 at kernel/sched/deadline.c:628 enqueue_task_dl+0x2355/0x3dc0 kernel/sched/deadline.c:1500 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 10956 Comm: syz-executor2 Not tainted 4.20.0+ #1 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+0x1db/0x2d0 lib/dump_stack.c:113 panic+0x2cb/0x589 kernel/panic.c:189 __warn.cold+0x20/0x4b kernel/panic.c:544 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:setup_new_dl_entity kernel/sched/deadline.c:628 [inline] RIP: 0010:enqueue_dl_entity kernel/sched/deadline.c:1429 [inline] RIP: 0010:enqueue_task_dl+0x2355/0x3dc0 kernel/sched/deadline.c:1500 Code: 3c 02 00 0f 85 ba 05 00 00 49 8b b5 50 0a 00 00 e9 53 fa ff ff e8 fb f2 64 00 48 8d 4d d8 e9 48 dd ff ff 0f 0b e9 92 f1 ff ff <0f> 0b e9 18 f1 ff ff 4c 89 ef 4c 89 95 28 ff ff ff 4c 89 85 30 ff RSP: 0018:ffff8880916ffaf8 EFLAGS: 00010002 RAX: 0000000000000002 RBX: 1ffff110122dff6a RCX: dffffc0000000000 RDX: 0000002f63244e20 RSI: 0000000000000004 RDI: ffff8880ae62d850 RBP: ffff8880916ffbf8 R08: ffff88808ca7a2f8 R09: ffff88808ca7a0bc R10: ffff88808ca7a340 R11: ffff8880ae62dc7b R12: ffff88808ca7a080 R13: ffff8880ae62ce00 R14: ffff8880ae62ce00 R15: ffff88808ca7a34c enqueue_task+0xb9/0x380 kernel/sched/core.c:730 __sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336 sched_setattr kernel/sched/core.c:4394 [inline] __do_sys_sched_setattr kernel/sched/core.c:4570 [inline] __se_sys_sched_setattr kernel/sched/core.c:4549 [inline] __x64_sys_sched_setattr+0x1af/0x2f0 kernel/sched/core.c:4549 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fde9ee1bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000013a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fde9ee1c6d4 R13: 00000000004c4a36 R14: 00000000004d8050 R15: 00000000ffffffff ====================================================== WARNING: possible circular locking dependency detected 4.20.0+ #1 Not tainted ------------------------------------------------------ syz-executor2/10956 is trying to acquire lock: 00000000a1ea1dbe ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 00000000e90232e2 (&rq->lock){-.-.}, at: task_rq_lock+0xc8/0x290 kernel/sched/core.c:99 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+0x2f/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1149 [inline] task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10083 sched_fork+0x437/0xb90 kernel/sched/core.c:2359 copy_process+0x1ff6/0x8730 kernel/fork.c:1893 _do_fork+0x1a9/0x1170 kernel/fork.c:2222 kernel_thread+0x34/0x40 kernel/fork.c:2281 rest_init+0x28/0x37b init/main.c:409 arch_call_rest_init+0xe/0x1b start_kernel+0x882/0x8bd init/main.c:741 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152 try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965 wake_up_process+0x10/0x20 kernel/sched/core.c:2129 __up.isra.0+0x1c0/0x2a0 kernel/locking/semaphore.c:262 up+0x13e/0x1c0 kernel/locking/semaphore.c:187 __up_console_sem+0xb7/0x1c0 kernel/printk/printk.c:236 console_unlock+0x778/0x11e0 kernel/printk/printk.c:2426 vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 check_stack_usage kernel/exit.c:755 [inline] do_exit.cold+0x57/0x16a kernel/exit.c:916 do_group_exit+0x177/0x430 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:979 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219 console_trylock+0x15/0xa0 kernel/printk/printk.c:2242 console_trylock_spinning kernel/printk/printk.c:1662 [inline] vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 __warn+0x9e/0x1d0 kernel/panic.c:526 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 setup_new_dl_entity kernel/sched/deadline.c:629 [inline] enqueue_dl_entity kernel/sched/deadline.c:1429 [inline] enqueue_task_dl+0x2355/0x3dc0 kernel/sched/deadline.c:1500 enqueue_task+0xb9/0x380 kernel/sched/core.c:730 __sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336 sched_setattr kernel/sched/core.c:4394 [inline] __do_sys_sched_setattr kernel/sched/core.c:4570 [inline] __se_sys_sched_setattr kernel/sched/core.c:4549 [inline] __x64_sys_sched_setattr+0x1af/0x2f0 kernel/sched/core.c:4549 do_syscall_64+0x1a3/0x800 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 *** 3 locks held by syz-executor2/10956: #0: 0000000006fe353b (rcu_read_lock){....}, at: __do_sys_sched_setattr kernel/sched/core.c:4563 [inline] #0: 0000000006fe353b (rcu_read_lock){....}, at: __se_sys_sched_setattr kernel/sched/core.c:4549 [inline] #0: 0000000006fe353b (rcu_read_lock){....}, at: __x64_sys_sched_setattr+0x144/0x2f0 kernel/sched/core.c:4549 #1: 00000000f1b6f648 (&p->pi_lock){-.-.}, at: task_rq_lock+0x6a/0x290 kernel/sched/core.c:97 #2: 00000000e90232e2 (&rq->lock){-.-.}, at: task_rq_lock+0xc8/0x290 kernel/sched/core.c:99 stack backtrace: CPU: 0 PID: 10956 Comm: syz-executor2 Not tainted 4.20.0+ #1 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+0x1db/0x2d0 lib/dump_stack.c:113 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2350 [inline] __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219 console_trylock+0x15/0xa0 kernel/printk/printk.c:2242 console_trylock_spinning kernel/printk/printk.c:1662 [inline] vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 __warn+0x9e/0x1d0 kernel/panic.c:526 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:setup_new_dl_entity kernel/sched/deadline.c:628 [inline] RIP: 0010:enqueue_dl_entity kernel/sched/deadline.c:1429 [inline] RIP: 0010:enqueue_task_dl+0x2355/0x3dc0 kernel/sched/deadline.c:1500 Code: 3c 02 00 0f 85 ba 05 00 00 49 8b b5 50 0a 00 00 e9 53 fa ff ff e8 fb f2 64 00 48 8d 4d d8 e9 48 dd ff ff 0f 0b e9 92 f1 ff ff <0f> 0b e9 18 f1 ff ff 4c 89 ef 4c 89 95 28 ff ff ff 4c 89 85 30 ff RSP: 0018:ffff8880916ffaf8 EFLAGS: 00010002 RAX: 0000000000000002 RBX: 1ffff110122dff6a RCX: dffffc0000000000 RDX: 0000002f63244e20 RSI: 0000000000000004 RDI: ffff8880ae62d850 RBP: ffff8880916ffbf8 R08: ffff88808ca7a2f8 R09: ffff88808ca7a0bc R10: ffff88808ca7a340 R11: ffff8880ae62dc7b R12: ffff88808ca7a080 R13: ffff8880ae62ce00 R14: ffff8880ae62ce00 R15: ffff88808ca7a34c enqueue_task+0xb9/0x380 kernel/sched/core.c:730 __sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336 sched_setattr kernel/sched/core.c:4394 [inline] __do_sys_sched_setattr kernel/sched/core.c:4570 [inline] __se_sys_sched_setattr kernel/sched/core.c:4549 [inline] __x64_sys_sched_setattr+0x1af/0x2f0 kernel/sched/core.c:4549 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fde9ee1bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000013a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fde9ee1c6d4 R13: 00000000004c4a36 R14: 00000000004d8050 R15: 00000000ffffffff Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..