Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 42.544553][ T26] audit: type=1800 audit(1556019779.692:33): pid=7698 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 42.569914][ T26] audit: type=1800 audit(1556019779.692:34): pid=7698 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.332414][ T26] audit: type=1400 audit(1556019781.482:35): avc: denied { map } for pid=7873 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program [ 76.143185][ T26] audit: type=1400 audit(1556019813.292:36): avc: denied { map } for pid=7885 comm="syz-executor060" path="/root/syz-executor060885457" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 76.710169][ T7949] ================================================================== [ 76.718662][ T7949] BUG: KASAN: use-after-free in __vb2_perform_fileio+0x1065/0x1140 [ 76.726833][ T7949] Read of size 4 at addr ffff8880a159ac1c by task syz-executor060/7949 [ 76.735056][ T7949] [ 76.737394][ T7949] CPU: 1 PID: 7949 Comm: syz-executor060 Not tainted 5.1.0-rc6 #78 [ 76.745264][ T7949] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.755300][ T7949] Call Trace: [ 76.758578][ T7949] dump_stack+0x172/0x1f0 [ 76.762996][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 76.768532][ T7949] print_address_description.cold+0x7c/0x20d [ 76.774598][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 76.780139][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 76.785699][ T7949] kasan_report.cold+0x1b/0x40 [ 76.791578][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 76.797670][ T7949] __asan_report_load4_noabort+0x14/0x20 [ 76.804377][ T7949] __vb2_perform_fileio+0x1065/0x1140 [ 76.811054][ T7949] ? vb2_thread_start+0x370/0x370 [ 76.816525][ T7949] vb2_read+0x3b/0x50 [ 76.820862][ T7949] vb2_fop_read+0x212/0x410 [ 76.825820][ T7949] ? vb2_fop_write+0x410/0x410 [ 76.831193][ T7949] v4l2_read+0x1ce/0x230 [ 76.835612][ T7949] __vfs_read+0x8d/0x110 [ 76.840025][ T7949] ? v4l2_write+0x230/0x230 [ 76.844607][ T7949] vfs_read+0x194/0x3e0 [ 76.848850][ T7949] ksys_read+0x14f/0x2d0 [ 76.853082][ T7949] ? kernel_write+0x120/0x120 [ 76.857845][ T7949] ? do_syscall_64+0x26/0x610 [ 76.862768][ T7949] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.869165][ T7949] ? do_syscall_64+0x26/0x610 [ 76.873829][ T7949] __x64_sys_read+0x73/0xb0 [ 76.878317][ T7949] do_syscall_64+0x103/0x610 [ 76.882987][ T7949] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.889049][ T7949] RIP: 0033:0x444f09 [ 76.893107][ T7949] 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 [ 76.916184][ T7949] RSP: 002b:00007fff4ec8be98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 76.924942][ T7949] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f09 [ 76.932983][ T7949] RDX: 000000000000004b RSI: 0000000020000280 RDI: 0000000000000003 [ 76.941374][ T7949] RBP: 0000000000012b45 R08: 0000000000000004 R09: 00000000004002e0 [ 76.951485][ T7949] R10: 000000000000000f R11: 0000000000000246 R12: 00000000004020a0 [ 76.959529][ T7949] R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 [ 76.968624][ T7949] [ 76.970940][ T7949] Allocated by task 7949: [ 76.975341][ T7949] save_stack+0x45/0xd0 [ 76.979953][ T7949] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 76.985581][ T7949] kasan_kmalloc+0x9/0x10 [ 76.993416][ T7949] kmem_cache_alloc_trace+0x151/0x760 [ 77.000195][ T7949] __vb2_init_fileio+0x1cb/0xbe0 [ 77.009174][ T7949] __vb2_perform_fileio+0xc01/0x1140 [ 77.014626][ T7949] vb2_read+0x3b/0x50 [ 77.018684][ T7949] vb2_fop_read+0x212/0x410 [ 77.023188][ T7949] v4l2_read+0x1ce/0x230 [ 77.027763][ T7949] __vfs_read+0x8d/0x110 [ 77.031987][ T7949] vfs_read+0x194/0x3e0 [ 77.036212][ T7949] ksys_read+0x14f/0x2d0 [ 77.040648][ T7949] __x64_sys_read+0x73/0xb0 [ 77.045170][ T7949] do_syscall_64+0x103/0x610 [ 77.050092][ T7949] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.056148][ T7949] [ 77.058568][ T7949] Freed by task 7955: [ 77.062798][ T7949] save_stack+0x45/0xd0 [ 77.066940][ T7949] __kasan_slab_free+0x102/0x150 [ 77.072046][ T7949] kasan_slab_free+0xe/0x10 [ 77.076729][ T7949] kfree+0xcf/0x230 [ 77.080709][ T7949] __vb2_cleanup_fileio+0x100/0x170 [ 77.086069][ T7949] vb2_core_queue_release+0x20/0x80 [ 77.091778][ T7949] _vb2_fop_release+0x1cf/0x2a0 [ 77.096717][ T7949] vb2_fop_release+0x75/0xc0 [ 77.101732][ T7949] vivid_fop_release+0x18e/0x430 [ 77.106949][ T7949] v4l2_release+0x224/0x3a0 [ 77.111541][ T7949] __fput+0x2e5/0x8d0 [ 77.115507][ T7949] ____fput+0x16/0x20 [ 77.119575][ T7949] task_work_run+0x14a/0x1c0 [ 77.124162][ T7949] do_exit+0x90a/0x2fa0 [ 77.128926][ T7949] do_group_exit+0x135/0x370 [ 77.133565][ T7949] __x64_sys_exit_group+0x44/0x50 [ 77.139222][ T7949] do_syscall_64+0x103/0x610 [ 77.144270][ T7949] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.151015][ T7949] [ 77.153353][ T7949] The buggy address belongs to the object at ffff8880a159a900 [ 77.153353][ T7949] which belongs to the cache kmalloc-1k of size 1024 [ 77.167915][ T7949] The buggy address is located 796 bytes inside of [ 77.167915][ T7949] 1024-byte region [ffff8880a159a900, ffff8880a159ad00) [ 77.181962][ T7949] The buggy address belongs to the page: [ 77.187668][ T7949] page:ffffea0002856680 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 [ 77.199189][ T7949] flags: 0x1fffc0000010200(slab|head) [ 77.204832][ T7949] raw: 01fffc0000010200 ffffea000261cc88 ffffea000284c008 ffff88812c3f0ac0 [ 77.213939][ T7949] raw: 0000000000000000 ffff8880a159a000 0000000100000007 0000000000000000 [ 77.223199][ T7949] page dumped because: kasan: bad access detected [ 77.230719][ T7949] [ 77.234766][ T7949] Memory state around the buggy address: [ 77.240380][ T7949] ffff8880a159ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 77.248634][ T7949] ffff8880a159ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program [ 77.256864][ T7949] >ffff8880a159ac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 77.265555][ T7949] ^ [ 77.270753][ T7949] ffff8880a159ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 77.279106][ T7949] ffff8880a159ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 77.287670][ T7949] ================================================================== [ 77.295899][ T7949] Disabling lock debugging due to kernel taint [ 77.308787][ T7949] Kernel panic - not syncing: panic_on_warn set ... [ 77.316159][ T7949] CPU: 0 PID: 7949 Comm: syz-executor060 Tainted: G B 5.1.0-rc6 #78 [ 77.325792][ T7949] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.337041][ T7949] Call Trace: [ 77.340555][ T7949] dump_stack+0x172/0x1f0 [ 77.344992][ T7949] panic+0x2cb/0x65c [ 77.349140][ T7949] ? __warn_printk+0xf3/0xf3 [ 77.353844][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 77.359399][ T7949] ? preempt_schedule+0x4b/0x60 [ 77.364593][ T7949] ? ___preempt_schedule+0x16/0x18 [ 77.370089][ T7949] ? trace_hardirqs_on+0x5e/0x230 [ 77.375341][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 77.380893][ T7949] end_report+0x47/0x4f [ 77.385045][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 77.390948][ T7949] kasan_report.cold+0xe/0x40 [ 77.395982][ T7949] ? __vb2_perform_fileio+0x1065/0x1140 [ 77.402191][ T7949] __asan_report_load4_noabort+0x14/0x20 [ 77.407833][ T7949] __vb2_perform_fileio+0x1065/0x1140 [ 77.413740][ T7949] ? vb2_thread_start+0x370/0x370 [ 77.419652][ T7949] vb2_read+0x3b/0x50 [ 77.423748][ T7949] vb2_fop_read+0x212/0x410 [ 77.428384][ T7949] ? vb2_fop_write+0x410/0x410 [ 77.433155][ T7949] v4l2_read+0x1ce/0x230 [ 77.437709][ T7949] __vfs_read+0x8d/0x110 [ 77.442384][ T7949] ? v4l2_write+0x230/0x230 [ 77.446937][ T7949] vfs_read+0x194/0x3e0 [ 77.451751][ T7949] ksys_read+0x14f/0x2d0 [ 77.456255][ T7949] ? kernel_write+0x120/0x120 [ 77.461271][ T7949] ? do_syscall_64+0x26/0x610 [ 77.466028][ T7949] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.472094][ T7949] ? do_syscall_64+0x26/0x610 [ 77.476857][ T7949] __x64_sys_read+0x73/0xb0 [ 77.481358][ T7949] do_syscall_64+0x103/0x610 [ 77.486179][ T7949] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.492068][ T7949] RIP: 0033:0x444f09 [ 77.495950][ T7949] 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 [ 77.518000][ T7949] RSP: 002b:00007fff4ec8be98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 77.528054][ T7949] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f09 [ 77.536283][ T7949] RDX: 000000000000004b RSI: 0000000020000280 RDI: 0000000000000003 [ 77.544470][ T7949] RBP: 0000000000012b45 R08: 0000000000000004 R09: 00000000004002e0 [ 77.552692][ T7949] R10: 000000000000000f R11: 0000000000000246 R12: 00000000004020a0 [ 77.561089][ T7949] R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 [ 77.570392][ T7949] Kernel Offset: disabled [ 77.574860][ T7949] Rebooting in 86400 seconds..