Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 197.589284][T11374] ------------[ cut here ]------------ [ 197.596795][T11374] Can't find any breakpoint slot [ 197.596877][T11374] WARNING: CPU: 0 PID: 11374 at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.613152][T11374] Kernel panic - not syncing: panic_on_warn set ... [ 197.619942][T11374] CPU: 0 PID: 11374 Comm: syz-executor764 Not tainted 5.1.0-rc1-next-20190322 #9 [ 197.629404][T11374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 197.639633][T11374] Call Trace: [ 197.642934][T11374] dump_stack+0x172/0x1f0 [ 197.647273][T11374] ? arch_install_hw_breakpoint+0x230/0x3a0 [ 197.653256][T11374] panic+0x2cb/0x65c [ 197.657153][T11374] ? __warn_printk+0xf3/0xf3 [ 197.661745][T11374] ? arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.667635][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 197.673966][T11374] ? __warn.cold+0x5/0x45 [ 197.678303][T11374] ? __warn+0xe8/0x1d0 [ 197.682372][T11374] ? arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.688268][T11374] __warn.cold+0x20/0x45 [ 197.692608][T11374] ? arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.698586][T11374] report_bug+0x263/0x2b0 [ 197.702918][T11374] do_error_trap+0x11b/0x200 [ 197.708396][T11374] do_invalid_op+0x37/0x50 [ 197.712929][T11374] ? arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.719180][T11374] invalid_op+0x14/0x20 [ 197.723346][T11374] RIP: 0010:arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.729954][T11374] Code: c8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 0f 0b 48 c7 c7 80 23 65 87 89 45 d4 c6 05 d2 f9 32 08 01 e8 e8 43 1b 00 <0f> 0b 8b 45 d4 e9 bc fd ff ff 40 88 75 c8 e8 47 d1 80 00 0f b6 75 [ 197.749697][T11374] RSP: 0018:ffff88808d69f6d8 EFLAGS: 00010086 [ 197.755944][T11374] RAX: 0000000000000000 RBX: ffff8880ae81ec98 RCX: 0000000000000000 [ 197.764091][T11374] RDX: 0000000040000000 RSI: ffffffff815b0316 RDI: ffffed1011ad3ecd [ 197.772235][T11374] RBP: ffff88808d69f718 R08: ffff88808b1ca540 R09: fffffbfff1133651 [ 197.780670][T11374] R10: fffffbfff1133650 R11: ffffffff8899b283 R12: ffff88808b4bf140 [ 197.788643][T11374] R13: dffffc0000000000 R14: 0000000000000004 R15: 000000000001eca0 [ 197.796688][T11374] ? vprintk_func+0x86/0x189 [ 197.801293][T11374] ? arch_install_hw_breakpoint+0x2d6/0x3a0 [ 197.807190][T11374] hw_breakpoint_add+0xa7/0x130 [ 197.812053][T11374] event_sched_in.isra.0+0x373/0xbf0 [ 197.817340][T11374] group_sched_in+0xe4/0x3d0 [ 197.821941][T11374] flexible_sched_in+0x615/0x9c0 [ 197.826892][T11374] visit_groups_merge+0x336/0x5d0 [ 197.832086][T11374] ? pinned_sched_in+0xa40/0xa40 [ 197.837030][T11374] ? perf_event_pid_type+0xf0/0xf0 [ 197.842337][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 197.848662][T11374] ctx_sched_in+0x330/0x670 [ 197.853297][T11374] ? visit_groups_merge+0x5d0/0x5d0 [ 197.858507][T11374] perf_event_sched_in+0x6e/0xa0 [ 197.863441][T11374] __perf_event_task_sched_in+0x609/0x820 [ 197.869158][T11374] ? perf_sched_cb_inc+0x260/0x260 [ 197.874270][T11374] ? rcu_read_lock_sched_held+0x110/0x130 [ 197.880081][T11374] ? __switch_to+0x601/0x1180 [ 197.884762][T11374] ? __switch_to_asm+0x34/0x70 [ 197.889525][T11374] ? __switch_to_asm+0x40/0x70 [ 197.894345][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 197.900749][T11374] finish_task_switch+0x2c2/0x780 [ 197.905778][T11374] ? __switch_to_asm+0x34/0x70 [ 197.910647][T11374] ? __switch_to_asm+0x40/0x70 [ 197.915403][T11374] __schedule+0x81f/0x1cc0 [ 197.919817][T11374] ? __sched_text_start+0x8/0x8 [ 197.924682][T11374] ? lock_downgrade+0x880/0x880 [ 197.929530][T11374] schedule+0x92/0x180 [ 197.933595][T11374] ptrace_stop+0x3fe/0x950 [ 197.938011][T11374] get_signal+0x1502/0x1d50 [ 197.942517][T11374] do_signal+0x87/0x1940 [ 197.946756][T11374] ? kasan_check_read+0x11/0x20 [ 197.951687][T11374] ? do_send_specific+0x156/0x250 [ 197.956703][T11374] ? setup_sigcontext+0x7d0/0x7d0 [ 197.961724][T11374] ? do_rt_tgsigqueueinfo+0xb8/0x110 [ 197.967023][T11374] ? do_syscall_64+0x52d/0x610 [ 197.971781][T11374] ? exit_to_usermode_loop+0x43/0x2c0 [ 197.977150][T11374] ? lockdep_hardirqs_on+0x418/0x5d0 [ 197.982440][T11374] ? trace_hardirqs_on+0x67/0x230 [ 197.987463][T11374] exit_to_usermode_loop+0x244/0x2c0 [ 197.992745][T11374] do_syscall_64+0x52d/0x610 [ 197.997421][T11374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 198.003303][T11374] RIP: 0033:0x447579 [ 198.007195][T11374] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 198.026896][T11374] RSP: 002b:00007f038dd0dce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000129 [ 198.035301][T11374] RAX: 0000000000000000 RBX: 00000000006dcc28 RCX: 0000000000447579 [ 198.043262][T11374] RDX: 0000000000000016 RSI: 0000000000002c6e RDI: 0000000000002c6e [ 198.051226][T11374] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 198.059206][T11374] R10: 0000000020000100 R11: 0000000000000246 R12: 00000000006dcc2c [ 198.067274][T11374] R13: 00007ffe53c2b4ef R14: 00007f038dd0e9c0 R15: 0000000000000000 [ 198.075259][T11374] [ 198.075265][T11374] ====================================================== [ 198.075271][T11374] WARNING: possible circular locking dependency detected [ 198.075276][T11374] 5.1.0-rc1-next-20190322 #9 Not tainted [ 198.075282][T11374] ------------------------------------------------------ [ 198.075287][T11374] syz-executor764/11374 is trying to acquire lock: [ 198.075291][T11374] 00000000730edf34 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 [ 198.075306][T11374] [ 198.075311][T11374] but task is already holding lock: [ 198.075314][T11374] 000000001c0c19b6 (&ctx->lock){....}, at: __perf_event_task_sched_in+0x554/0x820 [ 198.075330][T11374] [ 198.075335][T11374] which lock already depends on the new lock. [ 198.075338][T11374] [ 198.075340][T11374] [ 198.075346][T11374] the existing dependency chain (in reverse order) is: [ 198.075348][T11374] [ 198.075351][T11374] -> #3 (&ctx->lock){....}: [ 198.075364][T11374] lock_acquire+0x16f/0x3f0 [ 198.075369][T11374] _raw_spin_lock+0x2f/0x40 [ 198.075374][T11374] __perf_event_task_sched_out+0xf0f/0x1590 [ 198.075378][T11374] __schedule+0xbd1/0x1cc0 [ 198.075382][T11374] schedule+0x92/0x180 [ 198.075387][T11374] futex_wait_queue_me+0x30c/0x600 [ 198.075391][T11374] futex_wait+0x228/0x5e0 [ 198.075395][T11374] do_futex+0x170/0x1df0 [ 198.075399][T11374] __x64_sys_futex+0x3f7/0x590 [ 198.075404][T11374] do_syscall_64+0x103/0x610 [ 198.075409][T11374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 198.075412][T11374] [ 198.075414][T11374] -> #2 (&rq->lock){-.-.}: [ 198.075429][T11374] lock_acquire+0x16f/0x3f0 [ 198.075433][T11374] _raw_spin_lock+0x2f/0x40 [ 198.075437][T11374] task_fork_fair+0x6a/0x520 [ 198.075441][T11374] sched_fork+0x3b2/0x900 [ 198.075446][T11374] copy_process.part.0+0x18b9/0x79d0 [ 198.075450][T11374] _do_fork+0x257/0xfd0 [ 198.075454][T11374] kernel_thread+0x34/0x40 [ 198.075458][T11374] rest_init+0x28/0x37b [ 198.075463][T11374] arch_call_rest_init+0xe/0x1b [ 198.075467][T11374] start_kernel+0x816/0x84f [ 198.075472][T11374] x86_64_start_reservations+0x29/0x2b [ 198.075476][T11374] x86_64_start_kernel+0x77/0x7b [ 198.075481][T11374] secondary_startup_64+0xa4/0xb0 [ 198.075483][T11374] [ 198.075486][T11374] -> #1 (&p->pi_lock){-.-.}: [ 198.075500][T11374] lock_acquire+0x16f/0x3f0 [ 198.075505][T11374] _raw_spin_lock_irqsave+0x95/0xcd [ 198.075509][T11374] try_to_wake_up+0x8f/0x1000 [ 198.075514][T11374] wake_up_process+0x10/0x20 [ 198.075518][T11374] __up.isra.0+0x136/0x1a0 [ 198.075521][T11374] up+0x9c/0xe0 [ 198.075526][T11374] __up_console_sem+0xb7/0x1c0 [ 198.075530][T11374] console_unlock+0x681/0xeb0 [ 198.075534][T11374] vprintk_emit+0x280/0x6d0 [ 198.075538][T11374] vprintk_default+0x28/0x30 [ 198.075542][T11374] vprintk_func+0x7e/0x189 [ 198.075546][T11374] printk+0xba/0xed [ 198.075550][T11374] do_exit.cold+0x5d/0x254 [ 198.075554][T11374] do_group_exit+0x135/0x370 [ 198.075559][T11374] __x64_sys_exit_group+0x44/0x50 [ 198.075563][T11374] do_syscall_64+0x103/0x610 [ 198.075568][T11374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 198.075571][T11374] [ 198.075573][T11374] -> #0 ((console_sem).lock){-.-.}: [ 198.075589][T11374] __lock_acquire+0x239c/0x3fb0 [ 198.075593][T11374] lock_acquire+0x16f/0x3f0 [ 198.075598][T11374] _raw_spin_lock_irqsave+0x95/0xcd [ 198.075602][T11374] down_trylock+0x13/0x70 [ 198.075607][T11374] __down_trylock_console_sem+0xa8/0x210 [ 198.075611][T11374] console_trylock+0x15/0xa0 [ 198.075615][T11374] vprintk_emit+0x267/0x6d0 [ 198.075619][T11374] vprintk_default+0x28/0x30 [ 198.075624][T11374] vprintk_func+0x7e/0x189 [ 198.075627][T11374] printk+0xba/0xed [ 198.075632][T11374] __warn_printk+0x9b/0xf3 [ 198.075637][T11374] arch_install_hw_breakpoint+0x2d6/0x3a0 [ 198.075641][T11374] hw_breakpoint_add+0xa7/0x130 [ 198.075646][T11374] event_sched_in.isra.0+0x373/0xbf0 [ 198.075650][T11374] group_sched_in+0xe4/0x3d0 [ 198.075655][T11374] flexible_sched_in+0x615/0x9c0 [ 198.075659][T11374] visit_groups_merge+0x336/0x5d0 [ 198.075663][T11374] ctx_sched_in+0x330/0x670 [ 198.075668][T11374] perf_event_sched_in+0x6e/0xa0 [ 198.075673][T11374] __perf_event_task_sched_in+0x609/0x820 [ 198.075677][T11374] finish_task_switch+0x2c2/0x780 [ 198.075682][T11374] __schedule+0x81f/0x1cc0 [ 198.075686][T11374] schedule+0x92/0x180 [ 198.075690][T11374] ptrace_stop+0x3fe/0x950 [ 198.075694][T11374] get_signal+0x1502/0x1d50 [ 198.075698][T11374] do_signal+0x87/0x1940 [ 198.075703][T11374] exit_to_usermode_loop+0x244/0x2c0 [ 198.075707][T11374] do_syscall_64+0x52d/0x610 [ 198.075712][T11374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 198.075715][T11374] [ 198.075720][T11374] other info that might help us debug this: [ 198.075722][T11374] [ 198.075726][T11374] Chain exists of: [ 198.075728][T11374] (console_sem).lock --> &rq->lock --> &ctx->lock [ 198.075747][T11374] [ 198.075751][T11374] Possible unsafe locking scenario: [ 198.075753][T11374] [ 198.075758][T11374] CPU0 CPU1 [ 198.075762][T11374] ---- ---- [ 198.075765][T11374] lock(&ctx->lock); [ 198.075775][T11374] lock(&rq->lock); [ 198.075784][T11374] lock(&ctx->lock); [ 198.075792][T11374] lock((console_sem).lock); [ 198.075801][T11374] [ 198.075804][T11374] *** DEADLOCK *** [ 198.075807][T11374] [ 198.075811][T11374] 2 locks held by syz-executor764/11374: [ 198.075814][T11374] #0: 000000000f80ff7e (&cpuctx_lock){....}, at: __perf_event_task_sched_in+0x541/0x820 [ 198.075832][T11374] #1: 000000001c0c19b6 (&ctx->lock){....}, at: __perf_event_task_sched_in+0x554/0x820 [ 198.075851][T11374] [ 198.075854][T11374] stack backtrace: [ 198.075866][T11374] CPU: 0 PID: 11374 Comm: syz-executor764 Not tainted 5.1.0-rc1-next-20190322 #9 [ 198.075873][T11374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 198.075876][T11374] Call Trace: [ 198.075880][T11374] dump_stack+0x172/0x1f0 [ 198.075885][T11374] print_circular_bug.isra.0.cold+0x1cc/0x28f [ 198.075890][T11374] check_prev_add.constprop.0+0xf11/0x23c0 [ 198.075893][T11374] ? check_usage+0x570/0x570 [ 198.075898][T11374] ? check_prev_add.constprop.0+0x8c7/0x23c0 [ 198.075903][T11374] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 198.075907][T11374] ? __lockdep_reset_lock+0x450/0x450 [ 198.075912][T11374] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 198.075916][T11374] ? find_first_zero_bit+0x9a/0xc0 [ 198.075921][T11374] __lock_acquire+0x239c/0x3fb0 [ 198.075925][T11374] ? __lockdep_reset_lock+0x450/0x450 [ 198.075930][T11374] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 198.075934][T11374] ? mark_held_locks+0xf0/0xf0 [ 198.075938][T11374] ? kvm_clock_read+0x18/0x30 [ 198.075942][T11374] ? kvm_sched_clock_read+0x9/0x20 [ 198.075946][T11374] lock_acquire+0x16f/0x3f0 [ 198.075950][T11374] ? down_trylock+0x13/0x70 [ 198.075954][T11374] _raw_spin_lock_irqsave+0x95/0xcd [ 198.075958][T11374] ? down_trylock+0x13/0x70 [ 198.075962][T11374] ? vprintk_emit+0x267/0x6d0 [ 198.075966][T11374] down_trylock+0x13/0x70 [ 198.075970][T11374] ? vprintk_emit+0x267/0x6d0 [ 198.075975][T11374] __down_trylock_console_sem+0xa8/0x210 [ 198.075979][T11374] console_trylock+0x15/0xa0 [ 198.075982][T11374] vprintk_emit+0x267/0x6d0 [ 198.075986][T11374] vprintk_default+0x28/0x30 [ 198.075990][T11374] vprintk_func+0x7e/0x189 [ 198.076002][T11374] printk+0xba/0xed [ 198.076007][T11374] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 198.076011][T11374] ? __lock_acquire+0x548/0x3fb0 [ 198.076015][T11374] ? __warn_printk+0x8f/0xf3 [ 198.076019][T11374] ? debug_smp_processor_id+0x2e/0x280 [ 198.076023][T11374] __warn_printk+0x9b/0xf3 [ 198.076027][T11374] ? add_taint.cold+0x16/0x16 [ 198.076031][T11374] ? activate_task+0x1f8/0x470 [ 198.076036][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 198.076041][T11374] ? debug_smp_processor_id+0x2e/0x280 [ 198.076046][T11374] arch_install_hw_breakpoint+0x2d6/0x3a0 [ 198.076050][T11374] hw_breakpoint_add+0xa7/0x130 [ 198.076054][T11374] event_sched_in.isra.0+0x373/0xbf0 [ 198.076058][T11374] group_sched_in+0xe4/0x3d0 [ 198.076062][T11374] flexible_sched_in+0x615/0x9c0 [ 198.076067][T11374] visit_groups_merge+0x336/0x5d0 [ 198.076071][T11374] ? pinned_sched_in+0xa40/0xa40 [ 198.076075][T11374] ? perf_event_pid_type+0xf0/0xf0 [ 198.076080][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 198.076084][T11374] ctx_sched_in+0x330/0x670 [ 198.076088][T11374] ? visit_groups_merge+0x5d0/0x5d0 [ 198.076093][T11374] perf_event_sched_in+0x6e/0xa0 [ 198.076097][T11374] __perf_event_task_sched_in+0x609/0x820 [ 198.076102][T11374] ? perf_sched_cb_inc+0x260/0x260 [ 198.076107][T11374] ? rcu_read_lock_sched_held+0x110/0x130 [ 198.076111][T11374] ? __switch_to+0x601/0x1180 [ 198.076115][T11374] ? __switch_to_asm+0x34/0x70 [ 198.076119][T11374] ? __switch_to_asm+0x40/0x70 [ 198.076124][T11374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 198.076128][T11374] finish_task_switch+0x2c2/0x780 [ 198.076132][T11374] ? __switch_to_asm+0x34/0x70 [ 198.076136][T11374] ? __switch_to_asm+0x40/0x70 [ 198.076140][T11374] __schedule+0x81f/0x1cc0 [ 198.076144][T11374] ? __sched_text_start+0x8/0x8 [ 198.076148][T11374] ? lock_downgrade+0x880/0x880 [ 198.076151][T11374] schedule+0x92/0x180 [ 198.076155][T11374] ptrace_stop+0x3fe/0x950 [ 198.076159][T11374] get_signal+0x1502/0x1d50 [ 198.076163][T11374] do_signal+0x87/0x1940 [ 198.076167][T11374] ? kasan_check_read+0x11/0x20 [ 198.076171][T11374] ? do_send_specific+0x156/0x250 [ 198.076175][T11374] ? setup_sigcontext+0x7d0/0x7d0 [ 198.076180][T11374] ? do_rt_tgsigqueueinfo+0xb8/0x110 [ 198.076184][T11374] ? do_syscall_64+0x52d/0x610 [ 198.076188][T11374] ? exit_to_usermode_loop+0x43/0x2c0 [ 198.076193][T11374] ? lockdep_hardirqs_on+0x418/0x5d0 [ 198.076197][T11374] ? trace_hardirqs_on+0x67/0x230 [ 198.076201][T11374] exit_to_usermode_loop+0x244/0x2c0 [ 198.076205][T11374] do_syscall_64+0x52d/0x610 [ 198.076210][T11374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 198.076213][T11374] RIP: 0033:0x447579 [ 198.076227][T11374] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 198.076232][T11374] RSP: 002b:00007f038dd0dce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000129 [ 198.076242][T11374] RAX: 0000000000000000 RBX: 00000000006dcc28 RCX: 0000000000447579 [ 198.076248][T11374] RDX: 0000000000000016 RSI: 0000000000002c6e RDI: 0000000000002c6e [ 198.076254][T11374] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 198.076260][T11374] R10: 0000000020000100 R11: 0000000000000246 R12: 00000000006dcc2c [ 198.076266][T11374] R13: 00007ffe53c2b4ef R14: 00007f038dd0e9c0 R15: 0000000000000000 [ 199.212873][T11374] Shutting down cpus with NMI [ 200.284948][T11374] Kernel Offset: disabled [ 200.289273][T11374] Rebooting in 86400 seconds..