[[0;32m OK [0m] Started Getty on tty1.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Started OpenBSD Secure Shell server.
[[0;32m OK [0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[[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 '10.128.0.242' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
syzkaller login: [ 28.549102] ==================================================================
[ 28.556613] BUG: KASAN: use-after-free in __vb2_perform_fileio+0xce9/0xda0
[ 28.563611] Read of size 4 at addr ffff8880b39f799c by task syz-executor156/8002
[ 28.571137]
[ 28.572765] CPU: 0 PID: 8002 Comm: syz-executor156 Not tainted 4.14.235-syzkaller #0
[ 28.580750] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 28.590139] Call Trace:
[ 28.592859] dump_stack+0x1b2/0x281
[ 28.596504] print_address_description.cold+0x54/0x1d3
[ 28.601761] kasan_report_error.cold+0x8a/0x191
[ 28.606547] ? __vb2_perform_fileio+0xce9/0xda0
[ 28.611288] __asan_report_load4_noabort+0x68/0x70
[ 28.616221] ? __vb2_perform_fileio+0xce9/0xda0
[ 28.620959] __vb2_perform_fileio+0xce9/0xda0
[ 28.625449] ? __vb2_init_fileio+0xa90/0xa90
[ 28.629847] ? common_file_perm+0x3ee/0x580
[ 28.634179] vb2_fop_read+0x1ef/0x3d0
[ 28.637981] ? vb2_fop_write+0x3d0/0x3d0
[ 28.642024] v4l2_read+0x19a/0x200
[ 28.645557] do_iter_read+0x3eb/0x5b0
[ 28.649462] ? finish_mkwrite_fault+0x5e0/0x5e0
[ 28.654296] vfs_readv+0xc8/0x120
[ 28.657765] ? compat_rw_copy_check_uvector+0x320/0x320
[ 28.663121] ? lock_downgrade+0x740/0x740
[ 28.667251] SyS_preadv+0x15a/0x200
[ 28.670871] ? SyS_writev+0x30/0x30
[ 28.674491] ? __do_page_fault+0x159/0xad0
[ 28.678716] ? do_syscall_64+0x4c/0x640
[ 28.682677] ? SyS_writev+0x30/0x30
[ 28.686295] do_syscall_64+0x1d5/0x640
[ 28.690260] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.695431] RIP: 0033:0x444319
[ 28.698599] RSP: 002b:00007fffd4e847c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
[ 28.706423] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000444319
[ 28.713671] RDX: 0000000000000006 RSI: 0000000020003dc0 RDI: 0000000000000003
[ 28.720921] RBP: 0000000000000000 R08: 0000000000007c7f R09: 0000000000000001
[ 28.728171] R10: 0000000000008284 R11: 0000000000000246 R12: 0000000000403580
[ 28.735487] R13: 0000000000000000 R14: 00007fffd4e847f0 R15: 00007fffd4e847e0
[ 28.742743]
[ 28.744348] Allocated by task 8002:
[ 28.748077] kasan_kmalloc+0xeb/0x160
[ 28.751937] kmem_cache_alloc_trace+0x131/0x3d0
[ 28.756891] __vb2_init_fileio+0x17f/0xa90
[ 28.761203] __vb2_perform_fileio+0x993/0xda0
[ 28.765688] vb2_fop_read+0x1ef/0x3d0
[ 28.769465] v4l2_read+0x19a/0x200
[ 28.772986] do_iter_read+0x3eb/0x5b0
[ 28.776857] vfs_readv+0xc8/0x120
[ 28.780308] SyS_preadv+0x15a/0x200
[ 28.783918] do_syscall_64+0x1d5/0x640
[ 28.787784] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.792947]
[ 28.794558] Freed by task 8009:
[ 28.797823] kasan_slab_free+0xc3/0x1a0
[ 28.801790] kfree+0xc9/0x250
[ 28.804894] __vb2_cleanup_fileio+0xf5/0x150
[ 28.809279] vb2_core_queue_release+0x17/0x70
[ 28.813854] _vb2_fop_release+0x1c1/0x280
[ 28.818009] vivid_fop_release+0x17d/0x6c0
[ 28.822309] v4l2_release+0xf4/0x190
[ 28.826131] __fput+0x25f/0x7a0
[ 28.829398] task_work_run+0x11f/0x190
[ 28.833283] do_exit+0xa44/0x2850
[ 28.836838] do_group_exit+0x100/0x2e0
[ 28.840717] SyS_exit_group+0x19/0x20
[ 28.844527] do_syscall_64+0x1d5/0x640
[ 28.848404] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 28.853567]
[ 28.855193] The buggy address belongs to the object at ffff8880b39f7680
[ 28.855193] which belongs to the cache kmalloc-1024 of size 1024
[ 28.868002] The buggy address is located 796 bytes inside of
[ 28.868002] 1024-byte region [ffff8880b39f7680, ffff8880b39f7a80)
[ 28.880037] The buggy address belongs to the page:
[ 28.884944] page:ffffea0002ce7d80 count:1 mapcount:0 mapping:ffff8880b39f6000 index:0xffff8880b39f7200 compound_mapcount: 0
[ 28.896190] flags: 0xfff00000008100(slab|head)
[ 28.900786] raw: 00fff00000008100 ffff8880b39f6000 ffff8880b39f7200 0000000100000006
[ 28.908794] raw: ffffea0002d32f20 ffffea00025c33a0 ffff88813fe80ac0 0000000000000000
[ 28.917011] page dumped because: kasan: bad access detected
[ 28.922700]
[ 28.924305] Memory state around the buggy address:
[ 28.929228] ffff8880b39f7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.936583] ffff8880b39f7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.943924] >ffff8880b39f7980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.951265] ^
[ 28.955391] ffff8880b39f7a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.962741] ffff8880b39f7a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 28.970091] ==================================================================
[ 28.977609] Disabling lock debugging due to kernel taint
[ 28.984192] Kernel panic - not syncing: panic_on_warn set ...
[ 28.984192]
[ 28.991557] CPU: 0 PID: 8002 Comm: syz-executor156 Tainted: G B 4.14.235-syzkaller #0
[ 29.000839] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 29.010181] Call Trace:
[ 29.012752] dump_stack+0x1b2/0x281
[ 29.016364] panic+0x1f9/0x42d
[ 29.019589] ? add_taint.cold+0x16/0x16
[ 29.023571] ? ___preempt_schedule+0x16/0x18
[ 29.027971] kasan_end_report+0x43/0x49
[ 29.032007] kasan_report_error.cold+0xa7/0x191
[ 29.036740] ? __vb2_perform_fileio+0xce9/0xda0
[ 29.041403] __asan_report_load4_noabort+0x68/0x70
[ 29.046318] ? __vb2_perform_fileio+0xce9/0xda0
[ 29.051054] __vb2_perform_fileio+0xce9/0xda0
[ 29.055546] ? __vb2_init_fileio+0xa90/0xa90
[ 29.059961] ? common_file_perm+0x3ee/0x580
[ 29.064263] vb2_fop_read+0x1ef/0x3d0
[ 29.068055] ? vb2_fop_write+0x3d0/0x3d0
[ 29.072117] v4l2_read+0x19a/0x200
[ 29.075663] do_iter_read+0x3eb/0x5b0
[ 29.079448] ? finish_mkwrite_fault+0x5e0/0x5e0
[ 29.084111] vfs_readv+0xc8/0x120
[ 29.087545] ? compat_rw_copy_check_uvector+0x320/0x320
[ 29.092906] ? lock_downgrade+0x740/0x740
[ 29.097043] SyS_preadv+0x15a/0x200
[ 29.100652] ? SyS_writev+0x30/0x30
[ 29.104255] ? __do_page_fault+0x159/0xad0
[ 29.108471] ? do_syscall_64+0x4c/0x640
[ 29.112685] ? SyS_writev+0x30/0x30
[ 29.116289] do_syscall_64+0x1d5/0x640
[ 29.120178] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 29.125351] RIP: 0033:0x444319
[ 29.128517] RSP: 002b:00007fffd4e847c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
[ 29.136205] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000444319
[ 29.143458] RDX: 0000000000000006 RSI: 0000000020003dc0 RDI: 0000000000000003
[ 29.150702] RBP: 0000000000000000 R08: 0000000000007c7f R09: 0000000000000001
[ 29.157948] R10: 0000000000008284 R11: 0000000000000246 R12: 0000000000403580
[ 29.165206] R13: 0000000000000000 R14: 00007fffd4e847f0 R15: 00007fffd4e847e0
[ 29.173501] Kernel Offset: disabled
[ 29.177111] Rebooting in 86400 seconds..