[[0;32m OK [0m] Started Daily apt upgrade and clean activities.
Starting OpenBSD Secure Shell server...
Starting System Logging Service...
[[0;32m OK [0m] Started Daily Cleanup of Temporary Directories.
[[0;32m OK [0m] Reached target Timers.
[[0;32m OK [0m] Started Permit User Sessions.
[[0;32m OK [0m] Found device /dev/ttyS0.
[[0;32m OK [0m] Started System Logging Service.
[[0;32m OK [0m] Started OpenBSD Secure Shell server.
[[0;32m OK [0m] Started getty on tty2-tty6 if dbus and logind are not available.
[[0;32m OK [0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[[0;32m OK [0m] Started Getty on tty6.
[[0;32m OK [0m] Started Getty on tty5.
[[0;32m OK [0m] Started Getty on tty4.
[[0;32m OK [0m] Started Getty on tty3.
[[0;32m OK [0m] Started Getty on tty2.
[[0;32m OK [0m] Started Getty on tty1.
[[0;32m OK [0m] Started Serial Getty on ttyS0.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.146' (ECDSA) to the list of known hosts.
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syzkaller login: [ 75.012698][ T33] audit: type=1400 audit(1605958092.091:8): avc: denied { execmem } for pid=8478 comm="syz-executor865" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
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[ 75.140336][ C0]
[ 75.142863][ C0] ================================
[ 75.148047][ C0] WARNING: inconsistent lock state
[ 75.153617][ C0] 5.10.0-rc4-syzkaller #0 Not tainted
[ 75.159046][ C0] --------------------------------
[ 75.164193][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[ 75.171028][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[ 75.176988][ C0] ffff8880299808a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x75/0x480
[ 75.186980][ C0] {SOFTIRQ-ON-W} state was registered at:
[ 75.192691][ C0] lock_acquire+0x2a3/0x8c0
[ 75.197265][ C0] _raw_spin_lock+0x2a/0x40
[ 75.202047][ C0] __do_sys_io_uring_register+0x343a/0x40d0
[ 75.208061][ C0] do_syscall_64+0x2d/0x70
[ 75.212600][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 75.218563][ C0] irq event stamp: 111434
[ 75.222885][ C0] hardirqs last enabled at (111434): [<ffffffff88e8d562>] _raw_spin_unlock_irqrestore+0x42/0x50
[ 75.233371][ C0] hardirqs last disabled at (111433): [<ffffffff88e8d32e>] _raw_spin_lock_irqsave+0x4e/0x50
[ 75.243636][ C0] softirqs last enabled at (111386): [<ffffffff814279df>] irq_enter_rcu+0xcf/0xf0
[ 75.252907][ C0] softirqs last disabled at (111387): [<ffffffff89000eaf>] asm_call_irq_on_stack+0xf/0x20
[ 75.262773][ C0]
[ 75.262773][ C0] other info that might help us debug this:
[ 75.270819][ C0] Possible unsafe locking scenario:
[ 75.270819][ C0]
[ 75.278253][ C0] CPU0
[ 75.281522][ C0] ----
[ 75.284993][ C0] lock(&file_data->lock);
[ 75.289488][ C0] <Interrupt>
[ 75.292936][ C0] lock(&file_data->lock);
[ 75.297599][ C0]
[ 75.297599][ C0] *** DEADLOCK ***
[ 75.297599][ C0]
[ 75.306184][ C0] 2 locks held by swapper/0/0:
[ 75.311065][ C0] #0: ffffffff8b337600 (rcu_callback){....}-{0:0}, at: rcu_core+0x576/0xe80
[ 75.319964][ C0] #1: ffffffff8b337720 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x250
[ 75.330722][ C0]
[ 75.330722][ C0] stack backtrace:
[ 75.336739][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc4-syzkaller #0
[ 75.345483][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 75.355528][ C0] Call Trace:
[ 75.358996][ C0] <IRQ>
[ 75.361894][ C0] dump_stack+0x107/0x163
[ 75.366358][ C0] mark_lock.cold+0x32/0x74
[ 75.371074][ C0] ? lock_chain_count+0x20/0x20
[ 75.376090][ C0] ? mark_lock+0xf7/0x24c0
[ 75.380497][ C0] ? __lock_acquire+0x16c4/0x5c00
[ 75.385689][ C0] ? lock_chain_count+0x20/0x20
[ 75.390580][ C0] ? __lock_acquire+0x16c4/0x5c00
[ 75.395601][ C0] __lock_acquire+0x11b1/0x5c00
[ 75.400494][ C0] ? __lock_acquire+0xbe0/0x5c00
[ 75.405600][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400
[ 75.411871][ C0] lock_acquire+0x2a3/0x8c0
[ 75.416502][ C0] ? io_file_data_ref_zero+0x75/0x480
[ 75.421862][ C0] ? lock_release+0x710/0x710
[ 75.426754][ C0] ? lock_release+0x710/0x710
[ 75.431518][ C0] ? rcu_core+0x576/0xe80
[ 75.436011][ C0] _raw_spin_lock+0x2a/0x40
[ 75.440673][ C0] ? io_file_data_ref_zero+0x75/0x480
[ 75.446123][ C0] io_file_data_ref_zero+0x75/0x480
[ 75.451314][ C0] ? __percpu_ref_exit+0xa7/0x100
[ 75.456326][ C0] ? rcu_core+0x576/0xe80
[ 75.460645][ C0] percpu_ref_put_many.constprop.0+0x217/0x250
[ 75.466831][ C0] rcu_core+0x5df/0xe80
[ 75.470974][ C0] ? rcu_implicit_dynticks_qs+0x990/0x990
[ 75.476682][ C0] __do_softirq+0x2a0/0x9f6
[ 75.481327][ C0] asm_call_irq_on_stack+0xf/0x20
[ 75.486658][ C0] </IRQ>
[ 75.489823][ C0] do_softirq_own_stack+0xaa/0xd0
[ 75.495914][ C0] irq_exit_rcu+0x132/0x200
[ 75.500414][ C0] sysvec_apic_timer_interrupt+0x4d/0x100
[ 75.506125][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 75.512144][ C0] RIP: 0010:acpi_idle_do_entry+0x1c9/0x250
[ 75.517935][ C0] Code: 0d 5b 87 f8 84 db 75 ac e8 f4 62 87 f8 e8 3f 22 8d f8 e9 0c 00 00 00 e8 e5 62 87 f8 0f 00 2d 4e 52 bf 00 e8 d9 62 87 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 34 5b 87 f8 48 85 db
[ 75.537955][ C0] RSP: 0018:ffffffff8b007d60 EFLAGS: 00000293
[ 75.544381][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff19d9409
[ 75.552737][ C0] RDX: ffffffff8b09af80 RSI: ffffffff88e8ce97 RDI: 0000000000000000
[ 75.561101][ C0] RBP: ffff888141532064 R08: 0000000000000001 R09: 0000000000000001
[ 75.569232][ C0] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
[ 75.577195][ C0] R13: ffff888141532000 R14: ffff888141532064 R15: ffff8880184ad004
[ 75.585306][ C0] ? acpi_idle_do_entry+0x1c7/0x250
executing program
[ 75.590678][ C0] acpi_idle_enter+0x361/0x500
[ 75.595441][ C0] cpuidle_enter_state+0x1b1/0xc80
[ 75.600758][ C0] cpuidle_enter+0x4a/0xa0
[ 75.605382][ C0] do_idle+0x3e1/0x590
[ 75.609450][ C0] ? arch_cpu_idle_exit+0x40/0x40
[ 75.614601][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[ 75.620883][ C0] cpu_startup_entry+0x14/0x20
[ 75.625917][ C0] start_kernel+0x470/0x491
[ 75.630787][ C0] secondary_startup_64_no_verify+0xb0/0xbb
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