Warning: Permanently added '10.128.0.215' (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 syzkaller login: [ 51.391085][ T8015] ================================================================== [ 51.399272][ T8015] BUG: KASAN: use-after-free in __vb2_perform_fileio+0x1065/0x1140 [ 51.407149][ T8015] Read of size 4 at addr ffff88809381d9dc by task syz-executor684/8015 [ 51.415363][ T8015] [ 51.417719][ T8015] CPU: 0 PID: 8015 Comm: syz-executor684 Not tainted 5.1.0-rc6+ #88 [ 51.425713][ T8015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.435763][ T8015] Call Trace: [ 51.439132][ T8015] dump_stack+0x172/0x1f0 [ 51.443449][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 51.448995][ T8015] print_address_description.cold+0x7c/0x20d [ 51.454958][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 51.460488][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 51.466026][ T8015] kasan_report.cold+0x1b/0x40 [ 51.470799][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 51.476596][ T8015] __asan_report_load4_noabort+0x14/0x20 [ 51.482299][ T8015] __vb2_perform_fileio+0x1065/0x1140 [ 51.487660][ T8015] ? aa_path_link+0x460/0x460 [ 51.492346][ T8015] ? vb2_thread_start+0x370/0x370 [ 51.497364][ T8015] vb2_read+0x3b/0x50 [ 51.501366][ T8015] vb2_fop_read+0x212/0x410 [ 51.505881][ T8015] ? vb2_fop_write+0x410/0x410 [ 51.510721][ T8015] v4l2_read+0x1ce/0x230 [ 51.514962][ T8015] __vfs_read+0x8d/0x110 [ 51.519190][ T8015] ? v4l2_write+0x230/0x230 [ 51.523848][ T8015] vfs_read+0x194/0x3e0 [ 51.528004][ T8015] ksys_pread64+0x183/0x1c0 [ 51.532518][ T8015] ? __ia32_sys_write+0xb0/0xb0 [ 51.537401][ T8015] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 51.542863][ T8015] ? do_fast_syscall_32+0xd1/0xc98 [ 51.547971][ T8015] ? entry_SYSENTER_compat+0x70/0x7f [ 51.553250][ T8015] ? do_fast_syscall_32+0xd1/0xc98 [ 51.558351][ T8015] __ia32_compat_sys_x86_pread+0xc4/0x130 [ 51.564078][ T8015] do_fast_syscall_32+0x281/0xc98 [ 51.569101][ T8015] entry_SYSENTER_compat+0x70/0x7f [ 51.574194][ T8015] RIP: 0023:0xf7f8e869 [ 51.578250][ T8015] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 51.597842][ T8015] RSP: 002b:00000000ffd52ecc EFLAGS: 00000292 ORIG_RAX: 00000000000000b4 [ 51.606247][ T8015] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 [ 51.614228][ T8015] RDX: 0000000000000090 RSI: 0000000000000000 RDI: 00000000080c009f [ 51.622212][ T8015] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 51.630179][ T8015] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 51.638139][ T8015] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 51.646108][ T8015] [ 51.648423][ T8015] Allocated by task 8015: [ 51.652747][ T8015] save_stack+0x45/0xd0 [ 51.656927][ T8015] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 51.662792][ T8015] kasan_kmalloc+0x9/0x10 [ 51.667111][ T8015] kmem_cache_alloc_trace+0x151/0x760 [ 51.672464][ T8015] __vb2_init_fileio+0x1cb/0xbe0 [ 51.677385][ T8015] __vb2_perform_fileio+0xc01/0x1140 [ 51.682685][ T8015] vb2_read+0x3b/0x50 [ 51.686657][ T8015] vb2_fop_read+0x212/0x410 [ 51.691142][ T8015] v4l2_read+0x1ce/0x230 [ 51.695367][ T8015] __vfs_read+0x8d/0x110 [ 51.699593][ T8015] vfs_read+0x194/0x3e0 [ 51.703731][ T8015] ksys_pread64+0x183/0x1c0 [ 51.708223][ T8015] __ia32_compat_sys_x86_pread+0xc4/0x130 [ 51.714380][ T8015] do_fast_syscall_32+0x281/0xc98 [ 51.719399][ T8015] entry_SYSENTER_compat+0x70/0x7f [ 51.724487][ T8015] [ 51.727469][ T8015] Freed by task 8020: [ 51.731540][ T8015] save_stack+0x45/0xd0 [ 51.735805][ T8015] __kasan_slab_free+0x102/0x150 [ 51.740722][ T8015] kasan_slab_free+0xe/0x10 [ 51.745226][ T8015] kfree+0xcf/0x230 [ 51.749025][ T8015] __vb2_cleanup_fileio+0x100/0x170 [ 51.754231][ T8015] vb2_core_queue_release+0x20/0x80 [ 51.759423][ T8015] _vb2_fop_release+0x1cf/0x2a0 [ 51.764294][ T8015] vb2_fop_release+0x75/0xc0 [ 51.768865][ T8015] vivid_fop_release+0x18e/0x430 [ 51.773783][ T8015] v4l2_release+0x224/0x3a0 [ 51.778267][ T8015] __fput+0x2e5/0x8d0 [ 51.782237][ T8015] ____fput+0x16/0x20 [ 51.786213][ T8015] task_work_run+0x14a/0x1c0 [ 51.790790][ T8015] do_exit+0x90a/0x2fa0 [ 51.794928][ T8015] do_group_exit+0x135/0x370 [ 51.799503][ T8015] __ia32_sys_exit_group+0x44/0x50 [ 51.804596][ T8015] do_fast_syscall_32+0x281/0xc98 [ 51.809630][ T8015] entry_SYSENTER_compat+0x70/0x7f [ 51.814719][ T8015] [ 51.817030][ T8015] The buggy address belongs to the object at ffff88809381d6c0 [ 51.817030][ T8015] which belongs to the cache kmalloc-1k of size 1024 [ 51.831197][ T8015] The buggy address is located 796 bytes inside of [ 51.831197][ T8015] 1024-byte region [ffff88809381d6c0, ffff88809381dac0) [ 51.844539][ T8015] The buggy address belongs to the page: [ 51.850224][ T8015] page:ffffea00024e0700 count:1 mapcount:0 mapping:ffff8880aa400ac0 index:0x0 compound_mapcount: 0 [ 51.860894][ T8015] flags: 0x1fffc0000010200(slab|head) [ 51.866248][ T8015] raw: 01fffc0000010200 ffffea000242a688 ffffea000243f908 ffff8880aa400ac0 [ 51.874815][ T8015] raw: 0000000000000000 ffff88809381c040 0000000100000007 0000000000000000 [ 51.883375][ T8015] page dumped because: kasan: bad access detected [ 51.889799][ T8015] [ 51.892129][ T8015] Memory state around the buggy address: [ 51.897767][ T8015] ffff88809381d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.905835][ T8015] ffff88809381d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.913967][ T8015] >ffff88809381d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.923648][ T8015] ^ [ 51.930611][ T8015] ffff88809381da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.938849][ T8015] ffff88809381da80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 51.947046][ T8015] ================================================================== [ 51.955119][ T8015] Disabling lock debugging due to kernel taint [ 51.963257][ T8015] Kernel panic - not syncing: panic_on_warn set ... [ 51.969862][ T8015] CPU: 0 PID: 8015 Comm: syz-executor684 Tainted: G B 5.1.0-rc6+ #88 [ 51.979215][ T8015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.989341][ T8015] Call Trace: [ 51.992617][ T8015] dump_stack+0x172/0x1f0 [ 51.996930][ T8015] panic+0x2cb/0x65c [ 52.000811][ T8015] ? __warn_printk+0xf3/0xf3 [ 52.005386][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 52.010915][ T8015] ? preempt_schedule+0x4b/0x60 [ 52.015749][ T8015] ? ___preempt_schedule+0x16/0x18 [ 52.020854][ T8015] ? trace_hardirqs_on+0x5e/0x230 [ 52.025879][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 52.031428][ T8015] end_report+0x47/0x4f [ 52.035763][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 52.041316][ T8015] kasan_report.cold+0xe/0x40 [ 52.045977][ T8015] ? __vb2_perform_fileio+0x1065/0x1140 [ 52.051505][ T8015] __asan_report_load4_noabort+0x14/0x20 [ 52.057121][ T8015] __vb2_perform_fileio+0x1065/0x1140 [ 52.062477][ T8015] ? aa_path_link+0x460/0x460 [ 52.067150][ T8015] ? vb2_thread_start+0x370/0x370 [ 52.072447][ T8015] vb2_read+0x3b/0x50 [ 52.076439][ T8015] vb2_fop_read+0x212/0x410 [ 52.080947][ T8015] ? vb2_fop_write+0x410/0x410 [ 52.085694][ T8015] v4l2_read+0x1ce/0x230 [ 52.089945][ T8015] __vfs_read+0x8d/0x110 [ 52.094166][ T8015] ? v4l2_write+0x230/0x230 [ 52.098650][ T8015] vfs_read+0x194/0x3e0 [ 52.102793][ T8015] ksys_pread64+0x183/0x1c0 [ 52.107716][ T8015] ? __ia32_sys_write+0xb0/0xb0 [ 52.112570][ T8015] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.118033][ T8015] ? do_fast_syscall_32+0xd1/0xc98 [ 52.123140][ T8015] ? entry_SYSENTER_compat+0x70/0x7f [ 52.128407][ T8015] ? do_fast_syscall_32+0xd1/0xc98 [ 52.133512][ T8015] __ia32_compat_sys_x86_pread+0xc4/0x130 [ 52.139237][ T8015] do_fast_syscall_32+0x281/0xc98 [ 52.144365][ T8015] entry_SYSENTER_compat+0x70/0x7f [ 52.149470][ T8015] RIP: 0023:0xf7f8e869 [ 52.154105][ T8015] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 52.173696][ T8015] RSP: 002b:00000000ffd52ecc EFLAGS: 00000292 ORIG_RAX: 00000000000000b4 [ 52.182094][ T8015] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 [ 52.190051][ T8015] RDX: 0000000000000090 RSI: 0000000000000000 RDI: 00000000080c009f [ 52.198010][ T8015] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 52.206419][ T8015] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 52.214508][ T8015] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 52.223601][ T8015] Kernel Offset: disabled [ 52.227930][ T8015] Rebooting in 86400 seconds..