Warning: Permanently added '10.128.0.98' (ECDSA) to the list of known hosts.
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[   28.582429] ==================================================================
[   28.589927] BUG: KASAN: use-after-free in __vb2_perform_fileio+0xce9/0xda0
[   28.596924] Read of size 4 at addr ffff88809af0751c by task syz-executor017/7964
[   28.604430] 
[   28.606038] CPU: 0 PID: 7964 Comm: syz-executor017 Not tainted 4.14.260-syzkaller #0
[   28.613891] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.623220] Call Trace:
[   28.625789]  dump_stack+0x1b2/0x281
[   28.629392]  print_address_description.cold+0x54/0x1d3
[   28.634643]  kasan_report_error.cold+0x8a/0x191
[   28.639289]  ? __vb2_perform_fileio+0xce9/0xda0
[   28.643932]  __asan_report_load4_noabort+0x68/0x70
[   28.648837]  ? __vb2_perform_fileio+0xce9/0xda0
[   28.653578]  __vb2_perform_fileio+0xce9/0xda0
[   28.658063]  ? __vb2_init_fileio+0xa90/0xa90
[   28.662452]  ? common_file_perm+0x3ee/0x580
[   28.666753]  vb2_fop_read+0x1ef/0x3d0
[   28.670533]  ? vb2_fop_write+0x3d0/0x3d0
[   28.674568]  v4l2_read+0x19a/0x200
[   28.678085]  do_iter_read+0x3eb/0x5b0
[   28.681868]  ? finish_mkwrite_fault+0x5e0/0x5e0
[   28.686516]  vfs_readv+0xc8/0x120
[   28.690038]  ? compat_rw_copy_check_uvector+0x320/0x320
[   28.695391]  ? __do_page_fault+0x571/0xad0
[   28.699605]  ? lock_downgrade+0x740/0x740
[   28.703730]  SyS_preadv+0x15a/0x200
[   28.707331]  ? SyS_writev+0x30/0x30
[   28.710945]  ? __do_page_fault+0x159/0xad0
[   28.715168]  ? do_syscall_64+0x4c/0x640
[   28.719119]  ? SyS_writev+0x30/0x30
[   28.722722]  do_syscall_64+0x1d5/0x640
[   28.726590]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.731761] RIP: 0033:0x7f6217fa7439
[   28.735456] RSP: 002b:00007fff93053898 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
[   28.743142] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f6217fa7439
[   28.750387] RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000003
[   28.757632] RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
[   28.764877] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6217f666a0
[   28.772134] R13: 0000000000000000 R14: 00007fff930538c0 R15: 00007fff930538b0
[   28.779384] 
[   28.780988] Allocated by task 7959:
[   28.784602]  kasan_kmalloc+0xeb/0x160
[   28.788381]  kmem_cache_alloc_trace+0x131/0x3d0
[   28.793028]  __vb2_init_fileio+0x17f/0xa90
[   28.797268]  __vb2_perform_fileio+0x993/0xda0
[   28.801803]  vb2_fop_read+0x1ef/0x3d0
[   28.805590]  v4l2_read+0x19a/0x200
[   28.809114]  do_iter_read+0x3eb/0x5b0
[   28.812893]  vfs_readv+0xc8/0x120
[   28.816323]  SyS_preadv+0x15a/0x200
[   28.819934]  do_syscall_64+0x1d5/0x640
[   28.823803]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.828977] 
[   28.830578] Freed by task 7966:
[   28.833857]  kasan_slab_free+0xc3/0x1a0
[   28.837814]  kfree+0xc9/0x250
[   28.840898]  __vb2_cleanup_fileio+0xf5/0x150
[   28.845293]  vb2_core_queue_release+0x17/0x70
[   28.849972]  _vb2_fop_release+0x1c1/0x280
[   28.854108]  vivid_fop_release+0x17d/0x6c0
[   28.858326]  v4l2_release+0xf4/0x190
[   28.862018]  __fput+0x25f/0x7a0
[   28.865278]  task_work_run+0x11f/0x190
[   28.869141]  do_exit+0xa44/0x2850
[   28.872566]  do_group_exit+0x100/0x2e0
[   28.876427]  SyS_exit_group+0x19/0x20
[   28.880203]  do_syscall_64+0x1d5/0x640
[   28.884070]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.889231] 
[   28.890834] The buggy address belongs to the object at ffff88809af07200
[   28.890834]  which belongs to the cache kmalloc-1024 of size 1024
[   28.903644] The buggy address is located 796 bytes inside of
[   28.903644]  1024-byte region [ffff88809af07200, ffff88809af07600)
[   28.915711] The buggy address belongs to the page:
[   28.920621] page:ffffea00026bc180 count:1 mapcount:0 mapping:ffff88809af06000 index:0x0 compound_mapcount: 0
[   28.930564] flags: 0xfff00000008100(slab|head)
[   28.935120] raw: 00fff00000008100 ffff88809af06000 0000000000000000 0000000100000007
[   28.942987] raw: ffffea00028d4620 ffffea00028d5d20 ffff88813fe74ac0 0000000000000000
[   28.950838] page dumped because: kasan: bad access detected
[   28.956523] 
[   28.958125] Memory state around the buggy address:
[   28.963031]  ffff88809af07400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   28.970365]  ffff88809af07480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   28.977696] >ffff88809af07500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   28.985024]                             ^
[   28.989143]  ffff88809af07580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   28.996479]  ffff88809af07600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.003906] ==================================================================
[   29.011241] Disabling lock debugging due to kernel taint
[   29.017249] Kernel panic - not syncing: panic_on_warn set ...
[   29.017249] 
[   29.024602] CPU: 0 PID: 7964 Comm: syz-executor017 Tainted: G    B           4.14.260-syzkaller #0
[   29.033684] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.043030] Call Trace:
[   29.045609]  dump_stack+0x1b2/0x281
[   29.049235]  panic+0x1f9/0x42d
[   29.052414]  ? add_taint.cold+0x16/0x16
[   29.056366]  ? ___preempt_schedule+0x16/0x18
[   29.060835]  kasan_end_report+0x43/0x49
[   29.064785]  kasan_report_error.cold+0xa7/0x191
[   29.069429]  ? __vb2_perform_fileio+0xce9/0xda0
[   29.074074]  __asan_report_load4_noabort+0x68/0x70
[   29.078992]  ? __vb2_perform_fileio+0xce9/0xda0
[   29.083633]  __vb2_perform_fileio+0xce9/0xda0
[   29.088105]  ? __vb2_init_fileio+0xa90/0xa90
[   29.092490]  ? common_file_perm+0x3ee/0x580
[   29.096797]  vb2_fop_read+0x1ef/0x3d0
[   29.100586]  ? vb2_fop_write+0x3d0/0x3d0
[   29.104624]  v4l2_read+0x19a/0x200
[   29.108138]  do_iter_read+0x3eb/0x5b0
[   29.111912]  ? finish_mkwrite_fault+0x5e0/0x5e0
[   29.116553]  vfs_readv+0xc8/0x120
[   29.119978]  ? compat_rw_copy_check_uvector+0x320/0x320
[   29.125320]  ? __do_page_fault+0x571/0xad0
[   29.129531]  ? lock_downgrade+0x740/0x740
[   29.133656]  SyS_preadv+0x15a/0x200
[   29.137260]  ? SyS_writev+0x30/0x30
[   29.140861]  ? __do_page_fault+0x159/0xad0
[   29.145070]  ? do_syscall_64+0x4c/0x640
[   29.149017]  ? SyS_writev+0x30/0x30
[   29.152617]  do_syscall_64+0x1d5/0x640
[   29.156487]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.161653] RIP: 0033:0x7f6217fa7439
[   29.165337] RSP: 002b:00007fff93053898 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
[   29.173016] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f6217fa7439
[   29.180260] RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000003
[   29.187504] RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
[   29.194747] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6217f666a0
[   29.201990] R13: 0000000000000000 R14: 00007fff930538c0 R15: 00007fff930538b0
[   29.209518] Kernel Offset: disabled
[   29.213124] Rebooting in 86400 seconds..