INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-6,10.128.15.230' (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 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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 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 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 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 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: [ 47.925539] ================================================================== [ 47.926732] BUG: KASAN: use-after-free in irq_bypass_register_consumer+0x4f0/0x500 [ 47.927751] Read of size 8 at addr ffff8801d870f990 by task syzkaller199500/8357 [ 47.928742] [ 47.928986] CPU: 0 PID: 8357 Comm: syzkaller199500 Not tainted 4.14.0-rc2-mm1+ #9 [ 47.929992] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.931222] Call Trace: [ 47.931599] dump_stack+0x194/0x257 [ 47.932102] ? arch_local_irq_restore+0x53/0x53 [ 47.932732] ? show_regs_print_info+0x65/0x65 [ 47.933348] ? irq_bypass_register_consumer+0x4f0/0x500 [ 47.934085] print_address_description+0x73/0x250 [ 47.934737] ? irq_bypass_register_consumer+0x4f0/0x500 [ 47.935457] kasan_report+0x25b/0x340 [ 47.935982] __asan_report_load8_noabort+0x14/0x20 [ 47.936646] irq_bypass_register_consumer+0x4f0/0x500 [ 47.937356] ? __disconnect+0x1a0/0x1a0 [ 47.937897] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.938572] ? trace_hardirqs_on+0xd/0x10 [ 47.939136] ? queue_work_on+0x106/0x1c0 [ 47.939697] kvm_irqfd+0x137a/0x1d50 [ 47.940224] ? kvm_eventfd_init+0x2a0/0x2a0 [ 47.940810] ? find_held_lock+0x39/0x1d0 [ 47.941378] ? lock_downgrade+0x990/0x990 [ 47.941940] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.942661] ? __might_fault+0xe0/0x1d0 [ 47.943205] ? unwind_get_return_address+0x61/0xa0 [ 47.943872] ? lock_release+0xd70/0xd70 [ 47.944416] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 47.945234] ? __might_sleep+0x95/0x190 [ 47.945782] ? kasan_check_write+0x14/0x20 [ 47.949994] ? _copy_from_user+0x99/0x110 [ 47.954123] kvm_vm_ioctl+0x1079/0x1c40 [ 47.958079] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.963245] ? kvm_set_memory_region+0x50/0x50 [ 47.967808] ? check_noncircular+0x20/0x20 [ 47.972059] ? find_held_lock+0x39/0x1d0 [ 47.976111] ? lock_downgrade+0x990/0x990 [ 47.980244] ? __fget+0xbb/0x580 [ 47.983594] ? lock_release+0xd70/0xd70 [ 47.987548] ? __lock_is_held+0xbc/0x140 [ 47.991599] ? __fget+0x362/0x580 [ 47.995045] ? iterate_fd+0x3f0/0x3f0 [ 47.998822] ? __lock_is_held+0xbc/0x140 [ 48.002866] ? lock_acquire+0x1d5/0x580 [ 48.006818] ? kvm_set_memory_region+0x50/0x50 [ 48.011374] do_vfs_ioctl+0x1b1/0x1530 [ 48.015238] ? do_raw_spin_trylock+0x190/0x190 [ 48.019799] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.024187] ? selinux_capable+0x40/0x40 [ 48.028224] ? __lock_acquire+0x4216/0x4620 [ 48.032524] ? lockdep_sys_exit+0xb/0xf0 [ 48.036559] ? syscall_return_slowpath+0x2b3/0x510 [ 48.041462] ? finish_task_switch+0x1aa/0x740 [ 48.045940] ? security_file_ioctl+0x89/0xb0 [ 48.050330] SyS_ioctl+0x8f/0xc0 [ 48.053678] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.058406] RIP: 0033:0x445bf9 [ 48.061571] RSP: 002b:00007fc7f2964dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.069258] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445bf9 [ 48.076504] RDX: 0000000020025fe0 RSI: 000000004020ae76 RDI: 000000000000012c [ 48.083745] RBP: 0000000000000086 R08: 00007fc7f2965700 R09: 00007fc7f2965700 [ 48.090988] R10: 00007fc7f2965700 R11: 0000000000000202 R12: 0000000000000000 [ 48.098231] R13: 00007fff7816ffef R14: 00007fc7f29659c0 R15: 0000000000000000 [ 48.105495] [ 48.107097] Allocated by task 8357: [ 48.110699] save_stack_trace+0x16/0x20 [ 48.114647] save_stack+0x43/0xd0 [ 48.118073] kasan_kmalloc+0xad/0xe0 [ 48.121758] kmem_cache_alloc_trace+0x136/0x750 [ 48.126406] kvm_irqfd+0x16c/0x1d50 [ 48.130009] kvm_vm_ioctl+0x1079/0x1c40 [ 48.133964] do_vfs_ioctl+0x1b1/0x1530 [ 48.137825] SyS_ioctl+0x8f/0xc0 [ 48.141162] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.145888] [ 48.147488] Freed by task 1334: [ 48.150740] save_stack_trace+0x16/0x20 [ 48.154686] save_stack+0x43/0xd0 [ 48.158120] kasan_slab_free+0x71/0xc0 [ 48.161979] kfree+0xca/0x250 [ 48.165059] irqfd_shutdown+0x13c/0x1a0 [ 48.169006] process_one_work+0xbfa/0x1bd0 [ 48.173216] worker_thread+0x223/0x1860 [ 48.177163] kthread+0x39c/0x470 [ 48.180503] ret_from_fork+0x2a/0x40 [ 48.184187] [ 48.185789] The buggy address belongs to the object at ffff8801d870f800 [ 48.185789] which belongs to the cache kmalloc-512 of size 512 [ 48.198419] The buggy address is located 400 bytes inside of [ 48.198419] 512-byte region [ffff8801d870f800, ffff8801d870fa00) [ 48.210262] The buggy address belongs to the page: [ 48.215162] page:ffffea000761c3c0 count:1 mapcount:0 mapping:ffff8801d870f080 index:0x0 [ 48.223280] flags: 0x200000000000100(slab) [ 48.227491] raw: 0200000000000100 ffff8801d870f080 0000000000000000 0000000100000006 [ 48.235348] raw: ffffea000766c2a0 ffffea0007618560 ffff8801dac00940 0000000000000000 [ 48.243197] page dumped because: kasan: bad access detected [ 48.248877] [ 48.250479] Memory state around the buggy address: [ 48.255381] ffff8801d870f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.262711] ffff8801d870f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.270042] >ffff8801d870f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.277374] ^ [ 48.281234] ffff8801d870fa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 48.288564] ffff8801d870fa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.295892] ================================================================== [ 48.303237] Disabling lock debugging due to kernel taint [ 48.308776] Kernel panic - not syncing: panic_on_warn set ... [ 48.308776] [ 48.316115] CPU: 0 PID: 8357 Comm: syzkaller199500 Tainted: G B 4.14.0-rc2-mm1+ #9 [ 48.324915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.334235] Call Trace: [ 48.336791] dump_stack+0x194/0x257 [ 48.340388] ? arch_local_irq_restore+0x53/0x53 [ 48.345025] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.349751] ? irq_bypass_register_consumer+0x430/0x500 [ 48.355082] panic+0x1e4/0x417 [ 48.358241] ? __warn+0x1d9/0x1d9 [ 48.361668] ? irq_bypass_register_consumer+0x4f0/0x500 [ 48.367000] kasan_end_report+0x50/0x50 [ 48.370944] kasan_report+0x144/0x340 [ 48.374713] __asan_report_load8_noabort+0x14/0x20 [ 48.379610] irq_bypass_register_consumer+0x4f0/0x500 [ 48.384765] ? __disconnect+0x1a0/0x1a0 [ 48.388708] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.393693] ? trace_hardirqs_on+0xd/0x10 [ 48.397807] ? queue_work_on+0x106/0x1c0 [ 48.401838] kvm_irqfd+0x137a/0x1d50 [ 48.405528] ? kvm_eventfd_init+0x2a0/0x2a0 [ 48.409815] ? find_held_lock+0x39/0x1d0 [ 48.413848] ? lock_downgrade+0x990/0x990 [ 48.417963] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 48.423122] ? __might_fault+0xe0/0x1d0 [ 48.427065] ? unwind_get_return_address+0x61/0xa0 [ 48.431963] ? lock_release+0xd70/0xd70 [ 48.435906] ? trace_event_raw_event_sched_switch+0x770/0x770 [ 48.441765] ? __might_sleep+0x95/0x190 [ 48.445710] ? kasan_check_write+0x14/0x20 [ 48.449912] ? _copy_from_user+0x99/0x110 [ 48.454031] kvm_vm_ioctl+0x1079/0x1c40 [ 48.457976] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 48.463133] ? kvm_set_memory_region+0x50/0x50 [ 48.467685] ? check_noncircular+0x20/0x20 [ 48.471903] ? find_held_lock+0x39/0x1d0 [ 48.475935] ? lock_downgrade+0x990/0x990 [ 48.480059] ? __fget+0xbb/0x580 [ 48.483395] ? lock_release+0xd70/0xd70 [ 48.487341] ? __lock_is_held+0xbc/0x140 [ 48.491375] ? __fget+0x362/0x580 [ 48.494800] ? iterate_fd+0x3f0/0x3f0 [ 48.498569] ? __lock_is_held+0xbc/0x140 [ 48.502600] ? lock_acquire+0x1d5/0x580 [ 48.506544] ? kvm_set_memory_region+0x50/0x50 [ 48.511095] do_vfs_ioctl+0x1b1/0x1530 [ 48.514949] ? do_raw_spin_trylock+0x190/0x190 [ 48.519502] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.523878] ? selinux_capable+0x40/0x40 [ 48.527907] ? __lock_acquire+0x4216/0x4620 [ 48.532195] ? lockdep_sys_exit+0xb/0xf0 [ 48.536223] ? syscall_return_slowpath+0x2b3/0x510 [ 48.541119] ? finish_task_switch+0x1aa/0x740 [ 48.545588] ? security_file_ioctl+0x89/0xb0 [ 48.549966] SyS_ioctl+0x8f/0xc0 [ 48.553304] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.558027] RIP: 0033:0x445bf9 [ 48.561182] RSP: 002b:00007fc7f2964dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.568855] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445bf9 [ 48.576093] RDX: 0000000020025fe0 RSI: 000000004020ae76 RDI: 000000000000012c [ 48.583331] RBP: 0000000000000086 R08: 00007fc7f2965700 R09: 00007fc7f2965700 [ 48.590567] R10: 00007fc7f2965700 R11: 0000000000000202 R12: 0000000000000000 [ 48.597805] R13: 00007fff7816ffef R14: 00007fc7f29659c0 R15: 0000000000000000 [ 48.605489] Dumping ftrace buffer: [ 48.608997] (ftrace buffer empty) [ 48.612673] Kernel Offset: disabled [ 48.616265] Rebooting in 86400 seconds..