Warning: Permanently added '10.128.0.231' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 53.002337][ T8043] ================================================================== [ 53.010762][ T8043] BUG: KASAN: use-after-free in __vb2_perform_fileio+0x1065/0x1140 [ 53.018632][ T8043] Read of size 4 at addr ffff8880a487a35c by task syz-executor732/8043 [ 53.026844][ T8043] [ 53.029157][ T8043] CPU: 0 PID: 8043 Comm: syz-executor732 Not tainted 5.1.0-rc7+ #99 [ 53.037110][ T8043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.047245][ T8043] Call Trace: [ 53.050550][ T8043] dump_stack+0x172/0x1f0 [ 53.054862][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.060393][ T8043] print_address_description.cold+0x7c/0x20d [ 53.066439][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.071976][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.077550][ T8043] kasan_report.cold+0x1b/0x40 [ 53.082307][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.087839][ T8043] __asan_report_load4_noabort+0x14/0x20 [ 53.093450][ T8043] __vb2_perform_fileio+0x1065/0x1140 [ 53.099104][ T8043] ? vb2_thread_start+0x370/0x370 [ 53.104255][ T8043] ? fsnotify+0xbc0/0xbc0 [ 53.108577][ T8043] ? fsnotify_first_mark+0x210/0x210 [ 53.113847][ T8043] vb2_read+0x3b/0x50 [ 53.117815][ T8043] vb2_fop_read+0x212/0x410 [ 53.122297][ T8043] ? vb2_fop_write+0x410/0x410 [ 53.127763][ T8043] v4l2_read+0x1ce/0x230 [ 53.131996][ T8043] do_iter_read+0x4a9/0x660 [ 53.136479][ T8043] ? dup_iter+0x260/0x260 [ 53.140877][ T8043] vfs_readv+0xf0/0x160 [ 53.145014][ T8043] ? compat_rw_copy_check_uvector+0x3f0/0x3f0 [ 53.151073][ T8043] ? __handle_mm_fault+0x7cd/0x3ec0 [ 53.156256][ T8043] ? vmf_insert_mixed_mkwrite+0x40/0x40 [ 53.161794][ T8043] ? find_held_lock+0x35/0x130 [ 53.166544][ T8043] ? __do_page_fault+0x623/0xda0 [ 53.171619][ T8043] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.177849][ T8043] ? __fget_light+0x1a9/0x230 [ 53.182514][ T8043] do_readv+0x15e/0x370 [ 53.186757][ T8043] ? vfs_readv+0x160/0x160 [ 53.191163][ T8043] ? do_syscall_64+0x26/0x610 [ 53.195957][ T8043] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.202097][ T8043] ? do_syscall_64+0x26/0x610 [ 53.206890][ T8043] __x64_sys_readv+0x75/0xb0 [ 53.211470][ T8043] do_syscall_64+0x103/0x610 [ 53.216053][ T8043] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.221935][ T8043] RIP: 0033:0x444f19 [ 53.225811][ T8043] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 53.245440][ T8043] RSP: 002b:00007ffdbe0282e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 [ 53.253852][ T8043] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f19 [ 53.262175][ T8043] RDX: 0000000000000001 RSI: 0000000020001440 RDI: 0000000000000003 [ 53.270137][ T8043] RBP: 000000000000ced8 R08: 0000000000000004 R09: 00000000004002e0 [ 53.278102][ T8043] R10: 000000000000000f R11: 0000000000000246 R12: 00000000004020b0 [ 53.286059][ T8043] R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000 [ 53.294025][ T8043] [ 53.296523][ T8043] Allocated by task 8043: [ 53.300886][ T8043] save_stack+0x45/0xd0 [ 53.305040][ T8043] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 53.310693][ T8043] kasan_kmalloc+0x9/0x10 [ 53.315264][ T8043] kmem_cache_alloc_trace+0x151/0x760 [ 53.320933][ T8043] __vb2_init_fileio+0x1cb/0xbe0 [ 53.326386][ T8043] __vb2_perform_fileio+0xc01/0x1140 [ 53.331652][ T8043] vb2_read+0x3b/0x50 [ 53.335613][ T8043] vb2_fop_read+0x212/0x410 [ 53.340312][ T8043] v4l2_read+0x1ce/0x230 [ 53.344550][ T8043] do_iter_read+0x4a9/0x660 [ 53.349031][ T8043] vfs_readv+0xf0/0x160 [ 53.353444][ T8043] do_readv+0x15e/0x370 [ 53.357589][ T8043] __x64_sys_readv+0x75/0xb0 [ 53.362159][ T8043] do_syscall_64+0x103/0x610 [ 53.366736][ T8043] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.372603][ T8043] [ 53.374914][ T8043] Freed by task 8044: [ 53.379002][ T8043] save_stack+0x45/0xd0 [ 53.383147][ T8043] __kasan_slab_free+0x102/0x150 [ 53.388068][ T8043] kasan_slab_free+0xe/0x10 [ 53.392553][ T8043] kfree+0xcf/0x230 [ 53.396339][ T8043] __vb2_cleanup_fileio+0x100/0x170 [ 53.401690][ T8043] vb2_core_queue_release+0x20/0x80 [ 53.406935][ T8043] _vb2_fop_release+0x1cf/0x2a0 [ 53.411775][ T8043] vb2_fop_release+0x75/0xc0 [ 53.416353][ T8043] vivid_fop_release+0x18e/0x430 [ 53.421271][ T8043] v4l2_release+0x224/0x3a0 [ 53.426111][ T8043] __fput+0x2e5/0x8d0 [ 53.430075][ T8043] ____fput+0x16/0x20 [ 53.434045][ T8043] task_work_run+0x14a/0x1c0 [ 53.438710][ T8043] do_exit+0x90a/0x2fa0 [ 53.442855][ T8043] do_group_exit+0x135/0x370 [ 53.447859][ T8043] __x64_sys_exit_group+0x44/0x50 [ 53.452870][ T8043] do_syscall_64+0x103/0x610 [ 53.457493][ T8043] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.463755][ T8043] [ 53.466071][ T8043] The buggy address belongs to the object at ffff8880a487a040 [ 53.466071][ T8043] which belongs to the cache kmalloc-1k of size 1024 [ 53.480224][ T8043] The buggy address is located 796 bytes inside of [ 53.480224][ T8043] 1024-byte region [ffff8880a487a040, ffff8880a487a440) [ 53.493572][ T8043] The buggy address belongs to the page: [ 53.499205][ T8043] page:ffffea0002921e80 count:1 mapcount:0 mapping:ffff8880aa400ac0 index:0x0 compound_mapcount: 0 [ 53.509959][ T8043] flags: 0x1fffc0000010200(slab|head) [ 53.515332][ T8043] raw: 01fffc0000010200 ffffea0002831f88 ffffea0002283288 ffff8880aa400ac0 [ 53.524221][ T8043] raw: 0000000000000000 ffff8880a487a040 0000000100000007 0000000000000000 [ 53.532794][ T8043] page dumped because: kasan: bad access detected [ 53.539200][ T8043] [ 53.541576][ T8043] Memory state around the buggy address: [ 53.547207][ T8043] ffff8880a487a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.555277][ T8043] ffff8880a487a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.570135][ T8043] >ffff8880a487a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.578191][ T8043] ^ [ 53.585225][ T8043] ffff8880a487a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.593294][ T8043] ffff8880a487a400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 53.601364][ T8043] ================================================================== [ 53.609446][ T8043] Disabling lock debugging due to kernel taint [ 53.616955][ T8043] Kernel panic - not syncing: panic_on_warn set ... [ 53.623894][ T8043] CPU: 0 PID: 8043 Comm: syz-executor732 Tainted: G B 5.1.0-rc7+ #99 [ 53.633241][ T8043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.643730][ T8043] Call Trace: [ 53.647011][ T8043] dump_stack+0x172/0x1f0 [ 53.651382][ T8043] panic+0x2cb/0x65c [ 53.655265][ T8043] ? __warn_printk+0xf3/0xf3 [ 53.660494][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.666026][ T8043] ? preempt_schedule+0x4b/0x60 [ 53.670857][ T8043] ? ___preempt_schedule+0x16/0x18 [ 53.676170][ T8043] ? trace_hardirqs_on+0x5e/0x230 [ 53.681272][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.686937][ T8043] end_report+0x47/0x4f [ 53.691151][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.697259][ T8043] kasan_report.cold+0xe/0x40 [ 53.701964][ T8043] ? __vb2_perform_fileio+0x1065/0x1140 [ 53.707502][ T8043] __asan_report_load4_noabort+0x14/0x20 [ 53.713119][ T8043] __vb2_perform_fileio+0x1065/0x1140 [ 53.718479][ T8043] ? vb2_thread_start+0x370/0x370 [ 53.723492][ T8043] ? fsnotify+0xbc0/0xbc0 [ 53.727805][ T8043] ? fsnotify_first_mark+0x210/0x210 [ 53.733081][ T8043] vb2_read+0x3b/0x50 [ 53.737046][ T8043] vb2_fop_read+0x212/0x410 [ 53.741527][ T8043] ? vb2_fop_write+0x410/0x410 [ 53.746425][ T8043] v4l2_read+0x1ce/0x230 [ 53.750655][ T8043] do_iter_read+0x4a9/0x660 [ 53.755335][ T8043] ? dup_iter+0x260/0x260 [ 53.759807][ T8043] vfs_readv+0xf0/0x160 [ 53.763968][ T8043] ? compat_rw_copy_check_uvector+0x3f0/0x3f0 [ 53.770046][ T8043] ? __handle_mm_fault+0x7cd/0x3ec0 [ 53.775258][ T8043] ? vmf_insert_mixed_mkwrite+0x40/0x40 [ 53.780904][ T8043] ? find_held_lock+0x35/0x130 [ 53.785802][ T8043] ? __do_page_fault+0x623/0xda0 [ 53.790745][ T8043] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.796995][ T8043] ? __fget_light+0x1a9/0x230 [ 53.801669][ T8043] do_readv+0x15e/0x370 [ 53.805962][ T8043] ? vfs_readv+0x160/0x160 [ 53.810371][ T8043] ? do_syscall_64+0x26/0x610 [ 53.815256][ T8043] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.821331][ T8043] ? do_syscall_64+0x26/0x610 [ 53.826007][ T8043] __x64_sys_readv+0x75/0xb0 [ 53.830706][ T8043] do_syscall_64+0x103/0x610 [ 53.835511][ T8043] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.841401][ T8043] RIP: 0033:0x444f19 [ 53.845282][ T8043] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 53.865169][ T8043] RSP: 002b:00007ffdbe0282e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 [ 53.873589][ T8043] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f19 [ 53.881658][ T8043] RDX: 0000000000000001 RSI: 0000000020001440 RDI: 0000000000000003 [ 53.889627][ T8043] RBP: 000000000000ced8 R08: 0000000000000004 R09: 00000000004002e0 [ 53.897880][ T8043] R10: 000000000000000f R11: 0000000000000246 R12: 00000000004020b0 [ 53.905885][ T8043] R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000 [ 53.915143][ T8043] Kernel Offset: disabled [ 53.919621][ T8043] Rebooting in 86400 seconds..