[ 72.916206][ T26] audit: type=1800 audit(1560163623.295:29): pid=9132 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 77.688830][ T26] kauditd_printk_skb: 5 callbacks suppressed [ 77.688845][ T26] audit: type=1400 audit(1560163628.065:35): avc: denied { map } for pid=9306 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 '10.128.10.36' (ECDSA) to the list of known hosts. [ 94.658465][ T26] audit: type=1400 audit(1560163645.035:36): avc: denied { map } for pid=9318 comm="syz-executor901" path="/root/syz-executor901353328" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 94.674874][ T9327] IPVS: ftp: loaded support on port[0] = 21 [ 94.693271][ T9325] IPVS: ftp: loaded support on port[0] = 21 [ 94.693634][ T9326] IPVS: ftp: loaded support on port[0] = 21 [ 94.706134][ T9330] IPVS: ftp: loaded support on port[0] = 21 [ 94.710409][ T9328] IPVS: ftp: loaded support on port[0] = 21 [ 94.724892][ T9329] IPVS: ftp: loaded support on port[0] = 21 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 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 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 [ 95.274388][ T9626] ================================================================== [ 95.282768][ T9626] BUG: KASAN: use-after-free in mntput+0x91/0xa0 [ 95.289196][ T9626] Read of size 4 at addr ffff88809bb1fd24 by task syz-executor901/9626 [ 95.297469][ T9626] [ 95.299791][ T9626] CPU: 1 PID: 9626 Comm: syz-executor901 Not tainted 5.2.0-rc4 #18 [ 95.307807][ T9626] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.318076][ T9626] Call Trace: [ 95.321356][ T9626] dump_stack+0x172/0x1f0 [ 95.325910][ T9626] ? mntput+0x91/0xa0 [ 95.329884][ T9626] print_address_description.cold+0x7c/0x20d [ 95.336027][ T9626] ? mntput+0x91/0xa0 [ 95.340038][ T9626] ? mntput+0x91/0xa0 [ 95.344184][ T9626] __kasan_report.cold+0x1b/0x40 [ 95.349320][ T9626] ? mntput+0x91/0xa0 [ 95.353301][ T9626] kasan_report+0x12/0x20 [ 95.357648][ T9626] __asan_report_load4_noabort+0x14/0x20 [ 95.363379][ T9626] mntput+0x91/0xa0 [ 95.367170][ T9626] path_put+0x50/0x70 [ 95.371260][ T9626] free_fs_struct+0x25/0x70 [ 95.375751][ T9626] exit_fs+0xf0/0x130 [ 95.379725][ T9626] do_exit+0x8e0/0x2fa0 [ 95.383884][ T9626] ? mm_update_next_owner+0x640/0x640 [ 95.389244][ T9626] ? kasan_check_write+0x14/0x20 [ 95.394174][ T9626] ? up_read+0xc4/0x200 [ 95.398317][ T9626] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 95.403846][ T9626] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 95.409296][ T9626] do_group_exit+0x135/0x370 [ 95.414056][ T9626] __x64_sys_exit_group+0x44/0x50 [ 95.419069][ T9626] do_syscall_64+0xfd/0x680 [ 95.423561][ T9626] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.429439][ T9626] RIP: 0033:0x43ff48 [ 95.433332][ T9626] Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 [ 95.453054][ T9626] RSP: 002b:00007fff5e357838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 95.461559][ T9626] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff48 [ 95.469566][ T9626] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 95.477713][ T9626] RBP: 00000000004bfa70 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 95.485863][ T9626] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 95.494069][ T9626] R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 [ 95.502183][ T9626] [ 95.504499][ T9626] Allocated by task 9626: [ 95.508821][ T9626] save_stack+0x23/0x90 [ 95.512971][ T9626] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 95.518588][ T9626] kasan_slab_alloc+0xf/0x20 [ 95.523356][ T9626] kmem_cache_alloc+0x11a/0x6f0 [ 95.528725][ T9626] alloc_vfsmnt+0x28/0x780 [ 95.533135][ T9626] vfs_create_mount+0x96/0x500 [ 95.538200][ T9626] __x64_sys_fsmount+0x584/0xc80 [ 95.543149][ T9626] do_syscall_64+0xfd/0x680 [ 95.547782][ T9626] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.553659][ T9626] [ 95.555980][ T9626] Freed by task 16: [ 95.559783][ T9626] save_stack+0x23/0x90 [ 95.563934][ T9626] __kasan_slab_free+0x102/0x150 [ 95.568867][ T9626] kasan_slab_free+0xe/0x10 [ 95.573359][ T9626] kmem_cache_free+0x86/0x260 [ 95.578146][ T9626] free_vfsmnt+0x6f/0x90 [ 95.582383][ T9626] delayed_free_vfsmnt+0x16/0x20 [ 95.587366][ T9626] rcu_core+0xba5/0x1500 [ 95.591693][ T9626] __do_softirq+0x25c/0x94c [ 95.596413][ T9626] [ 95.598776][ T9626] The buggy address belongs to the object at ffff88809bb1fc00 [ 95.598776][ T9626] which belongs to the cache mnt_cache of size 432 [ 95.612666][ T9626] The buggy address is located 292 bytes inside of [ 95.612666][ T9626] 432-byte region [ffff88809bb1fc00, ffff88809bb1fdb0) [ 95.626099][ T9626] The buggy address belongs to the page: [ 95.631950][ T9626] page:ffffea00026ec7c0 refcount:1 mapcount:0 mapping:ffff88821bc48e00 index:0x0 [ 95.641056][ T9626] flags: 0x1fffc0000000200(slab) [ 95.646112][ T9626] raw: 01fffc0000000200 ffffea0002347bc8 ffff8880a9de6a48 ffff88821bc48e00 [ 95.654702][ T9626] raw: 0000000000000000 ffff88809bb1f000 0000000100000008 0000000000000000 [ 95.663394][ T9626] page dumped because: kasan: bad access detected [ 95.669843][ T9626] [ 95.672219][ T9626] Memory state around the buggy address: [ 95.678069][ T9626] ffff88809bb1fc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.686140][ T9626] ffff88809bb1fc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.694762][ T9626] >ffff88809bb1fd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.702925][ T9626] ^ [ 95.708073][ T9626] ffff88809bb1fd80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 95.716149][ T9626] ffff88809bb1fe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program [ 95.724339][ T9626] ================================================================== [ 95.732877][ T9626] Disabling lock debugging due to kernel taint [ 95.740870][ T9626] Kernel panic - not syncing: panic_on_warn set ... [ 95.747472][ T9626] CPU: 1 PID: 9626 Comm: syz-executor901 Tainted: G B 5.2.0-rc4 #18 [ 95.756746][ T9626] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.766998][ T9626] Call Trace: [ 95.770352][ T9626] dump_stack+0x172/0x1f0 [ 95.774745][ T9626] panic+0x2cb/0x744 [ 95.778626][ T9626] ? __warn_printk+0xf3/0xf3 [ 95.783214][ T9626] ? mntput+0x91/0xa0 [ 95.787193][ T9626] ? preempt_schedule+0x4b/0x60 [ 95.792164][ T9626] ? ___preempt_schedule+0x16/0x18 [ 95.797261][ T9626] ? trace_hardirqs_on+0x5e/0x220 [ 95.802270][ T9626] ? mntput+0x91/0xa0 [ 95.806280][ T9626] end_report+0x47/0x4f [ 95.810443][ T9626] ? mntput+0x91/0xa0 [ 95.814420][ T9626] __kasan_report.cold+0xe/0x40 [ 95.819293][ T9626] ? mntput+0x91/0xa0 [ 95.823309][ T9626] kasan_report+0x12/0x20 [ 95.827648][ T9626] __asan_report_load4_noabort+0x14/0x20 [ 95.833301][ T9626] mntput+0x91/0xa0 [ 95.837100][ T9626] path_put+0x50/0x70 [ 95.841102][ T9626] free_fs_struct+0x25/0x70 [ 95.845591][ T9626] exit_fs+0xf0/0x130 [ 95.849556][ T9626] do_exit+0x8e0/0x2fa0 [ 95.853734][ T9626] ? mm_update_next_owner+0x640/0x640 [ 95.859094][ T9626] ? kasan_check_write+0x14/0x20 [ 95.864017][ T9626] ? up_read+0xc4/0x200 [ 95.868172][ T9626] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 95.873689][ T9626] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 95.879511][ T9626] do_group_exit+0x135/0x370 [ 95.884398][ T9626] __x64_sys_exit_group+0x44/0x50 [ 95.890240][ T9626] do_syscall_64+0xfd/0x680 [ 95.895024][ T9626] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.901800][ T9626] RIP: 0033:0x43ff48 [ 95.905688][ T9626] Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 [ 95.925394][ T9626] RSP: 002b:00007fff5e357838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 95.934093][ T9626] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff48 [ 95.942244][ T9626] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 95.950669][ T9626] RBP: 00000000004bfa70 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 95.958714][ T9626] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 95.966941][ T9626] R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 [ 95.976275][ T9626] Kernel Offset: disabled [ 95.980624][ T9626] Rebooting in 86400 seconds..