[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.245' (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 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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 program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 235.894115] ================================================================== [ 235.901563] BUG: KASAN: use-after-free in __vb2_perform_fileio+0xce9/0xda0 [ 235.908648] Read of size 4 at addr ffff8880aafc599c by task syz-executor683/17812 [ 235.916238] [ 235.917851] CPU: 0 PID: 17812 Comm: syz-executor683 Not tainted 4.14.260-syzkaller #0 [ 235.925792] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 235.935118] Call Trace: [ 235.937686] dump_stack+0x1b2/0x281 [ 235.941291] print_address_description.cold+0x54/0x1d3 [ 235.946544] kasan_report_error.cold+0x8a/0x191 [ 235.951194] ? __vb2_perform_fileio+0xce9/0xda0 [ 235.955838] __asan_report_load4_noabort+0x68/0x70 [ 235.960744] ? __vb2_perform_fileio+0xce9/0xda0 [ 235.965387] __vb2_perform_fileio+0xce9/0xda0 [ 235.969859] ? __vb2_init_fileio+0xa90/0xa90 [ 235.974243] ? common_file_perm+0x3ee/0x580 [ 235.978542] vb2_fop_read+0x1ef/0x3d0 [ 235.982320] ? vb2_fop_write+0x3d0/0x3d0 [ 235.986354] v4l2_read+0x19a/0x200 [ 235.989873] do_iter_read+0x3eb/0x5b0 [ 235.993652] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 235.998296] vfs_readv+0xc8/0x120 [ 236.001724] ? compat_rw_copy_check_uvector+0x320/0x320 [ 236.007070] ? __do_page_fault+0x571/0xad0 [ 236.011281] ? lock_downgrade+0x740/0x740 [ 236.015404] SyS_preadv+0x15a/0x200 [ 236.019006] ? SyS_writev+0x30/0x30 [ 236.022607] ? __do_page_fault+0x159/0xad0 [ 236.026815] ? do_syscall_64+0x4c/0x640 [ 236.030763] ? SyS_writev+0x30/0x30 [ 236.034367] do_syscall_64+0x1d5/0x640 [ 236.038229] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 236.043393] RIP: 0033:0x7fb7b98e3459 [ 236.047080] RSP: 002b:00007fff41092ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 236.054765] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007fb7b98e3459 [ 236.062008] RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000003 [ 236.069253] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 236.076533] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003998b [ 236.083876] R13: 00007fff41092f0c R14: 00007fff41092f20 R15: 00007fff41092f10 [ 236.091133] [ 236.092739] Allocated by task 17812: [ 236.096435] kasan_kmalloc+0xeb/0x160 [ 236.100214] kmem_cache_alloc_trace+0x131/0x3d0 [ 236.104861] __vb2_init_fileio+0x17f/0xa90 [ 236.109069] __vb2_perform_fileio+0x993/0xda0 [ 236.113537] vb2_fop_read+0x1ef/0x3d0 [ 236.117312] v4l2_read+0x19a/0x200 [ 236.120825] do_iter_read+0x3eb/0x5b0 [ 236.124597] vfs_readv+0xc8/0x120 [ 236.128025] SyS_preadv+0x15a/0x200 [ 236.131627] do_syscall_64+0x1d5/0x640 [ 236.135497] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 236.140655] [ 236.142256] Freed by task 17813: [ 236.145595] kasan_slab_free+0xc3/0x1a0 [ 236.149545] kfree+0xc9/0x250 [ 236.152627] __vb2_cleanup_fileio+0xf5/0x150 [ 236.157010] vb2_core_queue_release+0x17/0x70 [ 236.161568] _vb2_fop_release+0x1c1/0x280 [ 236.165699] vivid_fop_release+0x17d/0x6c0 [ 236.170516] v4l2_release+0xf4/0x190 [ 236.174201] __fput+0x25f/0x7a0 [ 236.177453] task_work_run+0x11f/0x190 [ 236.181315] do_exit+0xa44/0x2850 [ 236.184755] do_group_exit+0x100/0x2e0 [ 236.188614] SyS_exit_group+0x19/0x20 [ 236.192394] do_syscall_64+0x1d5/0x640 [ 236.196253] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 236.201417] [ 236.203023] The buggy address belongs to the object at ffff8880aafc5680 [ 236.203023] which belongs to the cache kmalloc-1024 of size 1024 [ 236.215824] The buggy address is located 796 bytes inside of [ 236.215824] 1024-byte region [ffff8880aafc5680, ffff8880aafc5a80) [ 236.228366] The buggy address belongs to the page: [ 236.233273] page:ffffea0002abf100 count:1 mapcount:0 mapping:ffff8880aafc4000 index:0x0 compound_mapcount: 0 [ 236.243214] flags: 0xfff00000008100(slab|head) [ 236.247772] raw: 00fff00000008100 ffff8880aafc4000 0000000000000000 0000000100000007 [ 236.255627] raw: ffffea0002aa79a0 ffffea0002a966a0 ffff88813fe74ac0 0000000000000000 [ 236.263478] page dumped because: kasan: bad access detected [ 236.269158] [ 236.270758] Memory state around the buggy address: [ 236.275659] ffff8880aafc5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 236.282989] ffff8880aafc5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program [ 236.290326] >ffff8880aafc5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 236.297655] ^ [ 236.301776] ffff8880aafc5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 236.309145] ffff8880aafc5a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 236.316473] ================================================================== [ 236.323804] Disabling lock debugging due to kernel taint [ 236.333167] Kernel panic - not syncing: panic_on_warn set ... [ 236.333167] executing program executing program [ 236.340538] CPU: 0 PID: 17812 Comm: syz-executor683 Tainted: G B 4.14.260-syzkaller #0 [ 236.349706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 236.359048] Call Trace: [ 236.361627] dump_stack+0x1b2/0x281 [ 236.365251] panic+0x1f9/0x42d [ 236.368446] ? add_taint.cold+0x16/0x16 [ 236.372434] ? ___preempt_schedule+0x16/0x18 [ 236.377183] kasan_end_report+0x43/0x49 [ 236.381133] kasan_report_error.cold+0xa7/0x191 [ 236.385780] ? __vb2_perform_fileio+0xce9/0xda0 [ 236.390425] __asan_report_load4_noabort+0x68/0x70 [ 236.395330] ? __vb2_perform_fileio+0xce9/0xda0 [ 236.399977] __vb2_perform_fileio+0xce9/0xda0 [ 236.404447] ? __vb2_init_fileio+0xa90/0xa90 [ 236.408832] ? common_file_perm+0x3ee/0x580 [ 236.413125] vb2_fop_read+0x1ef/0x3d0 [ 236.416901] ? vb2_fop_write+0x3d0/0x3d0 [ 236.420934] v4l2_read+0x19a/0x200 [ 236.424449] do_iter_read+0x3eb/0x5b0 [ 236.428224] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 236.432873] vfs_readv+0xc8/0x120 [ 236.436344] ? compat_rw_copy_check_uvector+0x320/0x320 [ 236.441692] ? __do_page_fault+0x571/0xad0 [ 236.445908] ? lock_downgrade+0x740/0x740 [ 236.450032] SyS_preadv+0x15a/0x200 [ 236.453636] ? SyS_writev+0x30/0x30 [ 236.457242] ? __do_page_fault+0x159/0xad0 [ 236.461454] ? do_syscall_64+0x4c/0x640 [ 236.465434] ? SyS_writev+0x30/0x30 [ 236.469032] do_syscall_64+0x1d5/0x640 [ 236.472895] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 236.478332] RIP: 0033:0x7fb7b98e3459 [ 236.482018] RSP: 002b:00007fff41092ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 236.489697] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007fb7b98e3459 [ 236.496947] RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000003 [ 236.504191] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 236.511434] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003998b [ 236.518675] R13: 00007fff41092f0c R14: 00007fff41092f20 R15: 00007fff41092f10 [ 236.525985] Kernel Offset: disabled [ 236.529683] Rebooting in 86400 seconds..