[[0;32m OK [0m] Started Getty on tty2.
[[0;32m OK [0m] Started Serial Getty on ttyS0.
[[0;32m OK [0m] Started Getty on tty1.
[[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...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.193' (ECDSA) to the list of known hosts.
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syzkaller login: [ 27.365124] ==================================================================
[ 27.372980] BUG: KASAN: use-after-free in snd_seq_timer_interrupt+0x2d4/0x340
[ 27.380244] Read of size 8 at addr ffff8880a90c8398 by task syz-executor976/7975
[ 27.387759]
[ 27.389380] CPU: 0 PID: 7975 Comm: syz-executor976 Not tainted 4.14.241-syzkaller #0
[ 27.397271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 27.406808] Call Trace:
[ 27.409388]
[ 27.411518] dump_stack+0x1b2/0x281
[ 27.415157] print_address_description.cold+0x54/0x1d3
[ 27.420429] kasan_report_error.cold+0x8a/0x191
[ 27.425081] ? snd_seq_timer_interrupt+0x2d4/0x340
[ 27.429989] __asan_report_load8_noabort+0x68/0x70
[ 27.434898] ? snd_seq_timer_interrupt+0x2d4/0x340
[ 27.439819] snd_seq_timer_interrupt+0x2d4/0x340
[ 27.444563] snd_timer_interrupt.part.0+0x8ea/0xe20
[ 27.449590] ? initialize_timer+0x270/0x270
[ 27.453892] snd_timer_s_function+0x12c/0x1b0
[ 27.458379] call_timer_fn+0x14a/0x650
[ 27.462245] ? snd_timer_user_info_compat.isra.0+0x320/0x320
[ 27.468108] ? collect_expired_timers+0x250/0x250
[ 27.472928] ? _raw_spin_unlock_irq+0x24/0x80
[ 27.477446] ? snd_timer_user_info_compat.isra.0+0x320/0x320
[ 27.483272] expire_timers+0x232/0x4d0
[ 27.487138] run_timer_softirq+0x1d5/0x5a0
[ 27.491357] ? expire_timers+0x4d0/0x4d0
[ 27.495458] ? rcu_lockdep_current_cpu_online+0xed/0x140
[ 27.500907] __do_softirq+0x24d/0x9ff
[ 27.504783] ? check_preemption_disabled+0x35/0x240
[ 27.510076] irq_exit+0x193/0x240
[ 27.513516] smp_apic_timer_interrupt+0x141/0x5e0
[ 27.518564] apic_timer_interrupt+0x93/0xa0
[ 27.522951]
[ 27.525173] RIP: 0010:__orc_find+0x20/0xf0
[ 27.529728] RSP: 0018:ffff8880a2b377d8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10
[ 27.537413] RAX: 0000000000000002 RBX: 1ffff11014566f0b RCX: ffffffff87400089
[ 27.544662] RDX: 0000000000000002 RSI: ffffffff8ae11afc RDI: ffffffff8a6308c0
[ 27.551908] RBP: 0000000000000001 R08: ffffffff8ae11afc R09: ffffffff8ae11b08
[ 27.559426] R10: 0000000000146546 R11: 0000000000066071 R12: ffffffff8a6308c4
[ 27.566776] R13: ffff8880a2b37918 R14: ffff8880a2b37930 R15: ffff8880a2b378e0
[ 27.574032] ? entry_SYSCALL_64_after_hwframe+0x45/0xbb
[ 27.579378] unwind_next_frame+0x59a/0x17d0
[ 27.583676] ? do_syscall_64+0x1d5/0x640
[ 27.587721] ? deref_stack_reg+0x1a0/0x1a0
[ 27.592106] ? is_bpf_text_address+0xb8/0x150
[ 27.596584] ? kernel_text_address+0xbd/0xf0
[ 27.601004] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.606403] __save_stack_trace+0x90/0x160
[ 27.610623] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.616065] kasan_kmalloc+0xeb/0x160
[ 27.620107] ? kasan_kmalloc+0xeb/0x160
[ 27.624146] ? kmem_cache_alloc+0x111/0x3c0
[ 27.628461] ? anon_vma_fork+0x1c0/0x580
[ 27.632507] ? copy_process.part.0+0x4c64/0x71c0
[ 27.637239] ? _do_fork+0x184/0xc80
[ 27.640939] ? do_syscall_64+0x1d5/0x640
[ 27.645069] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.650517] ? kasan_kmalloc+0xeb/0x160
[ 27.654823] ? kmem_cache_alloc+0x124/0x3c0
[ 27.659142] ? trace_hardirqs_on+0x10/0x10
[ 27.663415] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.668763] ? trace_hardirqs_on+0x10/0x10
[ 27.673159] ? trace_hardirqs_on+0x10/0x10
[ 27.677381] ? anon_vma_clone+0x3ed/0x5b0
[ 27.681508] ? fs_reclaim_release+0xd0/0x110
[ 27.685892] ? mark_held_locks+0xa6/0xf0
[ 27.690160] ? kmem_cache_alloc+0x2c8/0x3c0
[ 27.694752] kmem_cache_alloc+0x111/0x3c0
[ 27.698970] anon_vma_fork+0x1c0/0x580
[ 27.702846] ? dup_userfaultfd+0x14a/0x5d0
[ 27.707078] copy_process.part.0+0x4c64/0x71c0
[ 27.711918] ? __cleanup_sighand+0x40/0x40
[ 27.716140] _do_fork+0x184/0xc80
[ 27.719575] ? fork_idle+0x270/0x270
[ 27.723269] ? common_nsleep+0x23/0x30
[ 27.727144] ? SyS_clock_nanosleep+0x210/0x2d0
[ 27.731724] ? compat_SyS_clock_getres+0x180/0x180
[ 27.736652] ? __do_page_fault+0x159/0xad0
[ 27.740875] ? do_syscall_64+0x4c/0x640
[ 27.744830] ? sys_vfork+0x20/0x20
[ 27.748355] do_syscall_64+0x1d5/0x640
[ 27.752253] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.757620] RIP: 0033:0x43eb0b
[ 27.760817] RSP: 002b:00007ffcc335a8e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 27.768592] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 000000000043eb0b
[ 27.775845] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 27.783232] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000628300
[ 27.790586] R10: 00000000006285d0 R11: 0000000000000246 R12: 0000000000000000
[ 27.797951] R13: 00007ffcc335a90c R14: 00007ffcc335a920 R15: 00007ffcc335a910
[ 27.805212]
[ 27.806829] Allocated by task 8070:
[ 27.810554] kasan_kmalloc+0xeb/0x160
[ 27.814430] kmem_cache_alloc_trace+0x131/0x3d0
[ 27.819310] snd_seq_queue_alloc+0x51/0x4c0
[ 27.823618] snd_seq_ioctl_create_queue+0xa5/0x2f0
[ 27.828539] snd_seq_ioctl+0x1af/0x310
[ 27.832409] do_vfs_ioctl+0x75a/0xff0
[ 27.836218] SyS_ioctl+0x7f/0xb0
[ 27.839585] do_syscall_64+0x1d5/0x640
[ 27.843492] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.848688]
[ 27.850332] Freed by task 8070:
[ 27.853605] kasan_slab_free+0xc3/0x1a0
[ 27.857661] kfree+0xc9/0x250
[ 27.860750] snd_seq_queue_client_leave+0x2f/0x120
[ 27.865856] seq_free_client1.part.0+0xf0/0x270
[ 27.870507] seq_free_client+0x6c/0xe0
[ 27.874489] snd_seq_release+0x4d/0xe0
[ 27.878361] __fput+0x25f/0x7a0
[ 27.881664] task_work_run+0x11f/0x190
[ 27.885550] do_exit+0xa44/0x2850
[ 27.889004] do_group_exit+0x100/0x2e0
[ 27.892871] SyS_exit_group+0x19/0x20
[ 27.896654] do_syscall_64+0x1d5/0x640
[ 27.900606] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.906206]
[ 27.907847] The buggy address belongs to the object at ffff8880a90c8340
[ 27.907847] which belongs to the cache kmalloc-512 of size 512
[ 27.920674] The buggy address is located 88 bytes inside of
[ 27.920674] 512-byte region [ffff8880a90c8340, ffff8880a90c8540)
[ 27.932457] The buggy address belongs to the page:
[ 27.937367] page:ffffea0002a43200 count:1 mapcount:0 mapping:ffff8880a90c80c0 index:0x0
[ 27.945489] flags: 0xfff00000000100(slab)
[ 27.949619] raw: 00fff00000000100 ffff8880a90c80c0 0000000000000000 0000000100000006
[ 27.957479] raw: ffffea0002afcba0 ffffea0002afcbe0 ffff88813fe80940 0000000000000000
[ 27.965424] page dumped because: kasan: bad access detected
[ 27.971286]
[ 27.972905] Memory state around the buggy address:
[ 27.977810] ffff8880a90c8280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[ 27.985164] ffff8880a90c8300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
[ 27.992499] >ffff8880a90c8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.000321] ^
[ 28.004793] ffff8880a90c8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.012216] ffff8880a90c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.019642] ==================================================================
[ 28.027064] Disabling lock debugging due to kernel taint
[ 28.032498] Kernel panic - not syncing: panic_on_warn set ...
[ 28.032498]
[ 28.039934] CPU: 0 PID: 7975 Comm: syz-executor976 Tainted: G B 4.14.241-syzkaller #0
[ 28.049091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 28.058430] Call Trace:
[ 28.060992]
[ 28.063122] dump_stack+0x1b2/0x281
[ 28.066733] panic+0x1f9/0x42d
[ 28.069936] ? add_taint.cold+0x16/0x16
[ 28.073922] ? lock_downgrade+0x740/0x740
[ 28.078052] kasan_end_report+0x43/0x49
[ 28.082100] kasan_report_error.cold+0xa7/0x191
[ 28.086858] ? snd_seq_timer_interrupt+0x2d4/0x340
[ 28.091763] __asan_report_load8_noabort+0x68/0x70
[ 28.096675] ? snd_seq_timer_interrupt+0x2d4/0x340
[ 28.101593] snd_seq_timer_interrupt+0x2d4/0x340
[ 28.106443] snd_timer_interrupt.part.0+0x8ea/0xe20
[ 28.111444] ? initialize_timer+0x270/0x270
[ 28.115746] snd_timer_s_function+0x12c/0x1b0
[ 28.120363] call_timer_fn+0x14a/0x650
[ 28.124315] ? snd_timer_user_info_compat.isra.0+0x320/0x320
[ 28.130101] ? collect_expired_timers+0x250/0x250
[ 28.135147] ? _raw_spin_unlock_irq+0x24/0x80
[ 28.139720] ? snd_timer_user_info_compat.isra.0+0x320/0x320
[ 28.145994] expire_timers+0x232/0x4d0
[ 28.149867] run_timer_softirq+0x1d5/0x5a0
[ 28.154437] ? expire_timers+0x4d0/0x4d0
[ 28.158481] ? rcu_lockdep_current_cpu_online+0xed/0x140
[ 28.163920] __do_softirq+0x24d/0x9ff
[ 28.167794] ? check_preemption_disabled+0x35/0x240
[ 28.173144] irq_exit+0x193/0x240
[ 28.176611] smp_apic_timer_interrupt+0x141/0x5e0
[ 28.181532] apic_timer_interrupt+0x93/0xa0
[ 28.185839]
[ 28.188231] RIP: 0010:__orc_find+0x20/0xf0
[ 28.192445] RSP: 0018:ffff8880a2b377d8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10
[ 28.200231] RAX: 0000000000000002 RBX: 1ffff11014566f0b RCX: ffffffff87400089
[ 28.207659] RDX: 0000000000000002 RSI: ffffffff8ae11afc RDI: ffffffff8a6308c0
[ 28.215107] RBP: 0000000000000001 R08: ffffffff8ae11afc R09: ffffffff8ae11b08
[ 28.222368] R10: 0000000000146546 R11: 0000000000066071 R12: ffffffff8a6308c4
[ 28.229617] R13: ffff8880a2b37918 R14: ffff8880a2b37930 R15: ffff8880a2b378e0
[ 28.236879] ? entry_SYSCALL_64_after_hwframe+0x45/0xbb
[ 28.242228] unwind_next_frame+0x59a/0x17d0
[ 28.246541] ? do_syscall_64+0x1d5/0x640
[ 28.250586] ? deref_stack_reg+0x1a0/0x1a0
[ 28.254991] ? is_bpf_text_address+0xb8/0x150
[ 28.259560] ? kernel_text_address+0xbd/0xf0
[ 28.264010] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.269532] __save_stack_trace+0x90/0x160
[ 28.273923] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.279351] kasan_kmalloc+0xeb/0x160
[ 28.283145] ? kasan_kmalloc+0xeb/0x160
[ 28.287094] ? kmem_cache_alloc+0x111/0x3c0
[ 28.291410] ? anon_vma_fork+0x1c0/0x580
[ 28.295450] ? copy_process.part.0+0x4c64/0x71c0
[ 28.300180] ? _do_fork+0x184/0xc80
[ 28.303803] ? do_syscall_64+0x1d5/0x640
[ 28.307841] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.313181] ? kasan_kmalloc+0xeb/0x160
[ 28.317146] ? kmem_cache_alloc+0x124/0x3c0
[ 28.321454] ? trace_hardirqs_on+0x10/0x10
[ 28.325810] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.331156] ? trace_hardirqs_on+0x10/0x10
[ 28.335376] ? trace_hardirqs_on+0x10/0x10
[ 28.339592] ? anon_vma_clone+0x3ed/0x5b0
[ 28.343877] ? fs_reclaim_release+0xd0/0x110
[ 28.348264] ? mark_held_locks+0xa6/0xf0
[ 28.352431] ? kmem_cache_alloc+0x2c8/0x3c0
[ 28.356739] kmem_cache_alloc+0x111/0x3c0
[ 28.361075] anon_vma_fork+0x1c0/0x580
[ 28.364951] ? dup_userfaultfd+0x14a/0x5d0
[ 28.369172] copy_process.part.0+0x4c64/0x71c0
[ 28.373761] ? __cleanup_sighand+0x40/0x40
[ 28.377977] _do_fork+0x184/0xc80
[ 28.381410] ? fork_idle+0x270/0x270
[ 28.385121] ? common_nsleep+0x23/0x30
[ 28.388986] ? SyS_clock_nanosleep+0x210/0x2d0
[ 28.393571] ? compat_SyS_clock_getres+0x180/0x180
[ 28.398748] ? __do_page_fault+0x159/0xad0
[ 28.403080] ? do_syscall_64+0x4c/0x640
[ 28.407070] ? sys_vfork+0x20/0x20
[ 28.410614] do_syscall_64+0x1d5/0x640
[ 28.414488] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.419657] RIP: 0033:0x43eb0b
[ 28.422822] RSP: 002b:00007ffcc335a8e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 28.431039] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 000000000043eb0b
[ 28.438481] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 28.445850] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000628300
[ 28.453249] R10: 00000000006285d0 R11: 0000000000000246 R12: 0000000000000000
[ 28.460505] R13: 00007ffcc335a90c R14: 00007ffcc335a920 R15: 00007ffcc335a910
[ 28.469437] Kernel Offset: disabled
[ 28.473046] Rebooting in 86400 seconds..