Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.694777] audit: type=1800 audit(1569292102.687:33): pid=7320 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=2465 res=0 [ 36.716116] audit: type=1800 audit(1569292102.687:34): pid=7320 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=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 40.681161] audit: type=1400 audit(1569292106.677:35): avc: denied { map } for pid=7495 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 '10.128.10.12' (ECDSA) to the list of known hosts. [ 47.139793] audit: type=1400 audit(1569292113.137:36): avc: denied { map } for pid=7507 comm="syz-executor125" path="/root/syz-executor125018820" 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 [ 47.161141] IPVS: ftp: loaded support on port[0] = 21 [ 47.217280] chnl_net:caif_netlink_parms(): no params data found [ 47.248266] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.255297] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.262518] device bridge_slave_0 entered promiscuous mode [ 47.270226] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.276600] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.283896] device bridge_slave_1 entered promiscuous mode [ 47.299810] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.309826] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.325407] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 47.333885] team0: Port device team_slave_0 added [ 47.339640] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 47.346927] team0: Port device team_slave_1 added [ 47.352465] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.359761] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.440863] device hsr_slave_0 entered promiscuous mode [ 47.488883] device hsr_slave_1 entered promiscuous mode [ 47.529155] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.536096] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.549501] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.555990] bridge0: port 2(bridge_slave_1) entered forwarding state [ 47.562913] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.569310] bridge0: port 1(bridge_slave_0) entered forwarding state [ 47.600892] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 47.606982] 8021q: adding VLAN 0 to HW filter on device bond0 [ 47.615458] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 47.624271] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 47.643712] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.651083] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.658103] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 47.669054] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 47.675142] 8021q: adding VLAN 0 to HW filter on device team0 [ 47.684623] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 47.692473] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.698855] bridge0: port 1(bridge_slave_0) entered forwarding state [ 47.707958] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 47.715908] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.722389] bridge0: port 2(bridge_slave_1) entered forwarding state [ 47.737097] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 47.745911] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 47.757178] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 47.767493] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 47.777964] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 47.786731] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 47.793297] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 47.805777] IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready [ 47.815721] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 47.900268] ================================================================== [ 47.907753] BUG: KASAN: use-after-free in pids_release+0x228/0x250 [ 47.914087] Read of size 8 at addr ffff8880a5f93408 by task syz-executor125/7507 [ 47.921616] [ 47.923234] CPU: 0 PID: 7507 Comm: syz-executor125 Not tainted 4.19.75 #0 [ 47.930147] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.939496] Call Trace: [ 47.942072] dump_stack+0x172/0x1f0 [ 47.945685] ? pids_release+0x228/0x250 [ 47.949647] print_address_description.cold+0x7c/0x20d [ 47.954926] ? pids_release+0x228/0x250 [ 47.958884] kasan_report.cold+0x8c/0x2ba [ 47.963033] __asan_report_load8_noabort+0x14/0x20 [ 47.967968] pids_release+0x228/0x250 [ 47.971761] cgroup_release+0x101/0x4a0 [ 47.975720] ? proc_tid_base_readdir+0x30/0x30 [ 47.980306] ? cgroup_exit+0x520/0x520 [ 47.984181] ? kasan_check_read+0x11/0x20 [ 47.988315] release_task+0x194/0x1630 [ 47.992188] ? _raw_spin_unlock_irq+0x28/0x90 [ 47.996679] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.001248] ? trace_hardirqs_on+0x67/0x220 [ 48.005570] wait_consider_task+0x2c95/0x3910 [ 48.010059] ? release_task+0x1630/0x1630 [ 48.014189] ? lock_acquire+0x16f/0x3f0 [ 48.018144] ? do_wait+0x3aa/0x9d0 [ 48.021673] ? kasan_check_write+0x14/0x20 [ 48.025892] do_wait+0x439/0x9d0 [ 48.029250] ? wait_consider_task+0x3910/0x3910 [ 48.033908] kernel_wait4+0x171/0x290 [ 48.037692] ? __ia32_sys_waitid+0x140/0x140 [ 48.042106] ? task_stopped_code+0x180/0x180 [ 48.046505] ? find_held_lock+0x35/0x130 [ 48.050561] ? __do_page_fault+0x676/0xe90 [ 48.054786] __do_sys_wait4+0x147/0x160 [ 48.058748] ? kernel_wait4+0x290/0x290 [ 48.062709] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.068234] ? up_read+0x1a/0x110 [ 48.071675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.077195] ? __do_page_fault+0x484/0xe90 [ 48.081426] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.086230] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.090972] ? do_syscall_64+0x26/0x620 [ 48.094931] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.100279] ? do_syscall_64+0x26/0x620 [ 48.104246] __x64_sys_wait4+0x97/0xf0 [ 48.108141] do_syscall_64+0xfd/0x620 [ 48.111940] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.117115] RIP: 0033:0x40200a [ 48.120289] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 05 2e 8b 2d 00 85 c0 75 36 45 31 d2 48 63 d2 48 63 ff b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 d0 ff ff ff f7 [ 48.139202] RSP: 002b:00007ffcc5e510b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d [ 48.146905] RAX: ffffffffffffffda RBX: 0000000000001d54 RCX: 000000000040200a [ 48.154174] RDX: 0000000040000000 RSI: 00007ffcc5e510c4 RDI: ffffffffffffffff [ 48.161431] RBP: 00000000006d3018 R08: 0000000000000000 R09: 0000555556079880 [ 48.168685] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402fc0 [ 48.175951] R13: 0000000000403050 R14: 0000000000000000 R15: 0000000000000000 [ 48.183216] [ 48.184828] Allocated by task 7507: [ 48.188448] save_stack+0x45/0xd0 [ 48.191906] kasan_kmalloc+0xce/0xf0 [ 48.195602] kasan_slab_alloc+0xf/0x20 [ 48.199472] kmem_cache_alloc_node+0x144/0x710 [ 48.204035] copy_process.part.0+0x1ce0/0x7a30 [ 48.208603] _do_fork+0x257/0xfd0 [ 48.212047] __x64_sys_clone+0xbf/0x150 [ 48.216005] do_syscall_64+0xfd/0x620 [ 48.219790] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.224955] [ 48.226561] Freed by task 0: [ 48.229566] save_stack+0x45/0xd0 [ 48.233002] __kasan_slab_free+0x102/0x150 [ 48.237232] kasan_slab_free+0xe/0x10 [ 48.241014] kmem_cache_free+0x86/0x260 [ 48.244967] free_task+0xdd/0x120 [ 48.248406] __put_task_struct+0x20f/0x4c0 [ 48.252628] finish_task_switch+0x52b/0x780 [ 48.256933] __schedule+0x86e/0x1dc0 [ 48.260630] schedule_idle+0x58/0x80 [ 48.264325] do_idle+0x192/0x560 [ 48.267671] cpu_startup_entry+0xc8/0xe0 [ 48.271719] start_secondary+0x3e8/0x5b0 [ 48.275771] secondary_startup_64+0xa4/0xb0 [ 48.280091] [ 48.281706] The buggy address belongs to the object at ffff8880a5f92340 [ 48.281706] which belongs to the cache task_struct of size 6080 [ 48.294436] The buggy address is located 4296 bytes inside of [ 48.294436] 6080-byte region [ffff8880a5f92340, ffff8880a5f93b00) [ 48.306467] The buggy address belongs to the page: [ 48.311383] page:ffffea000297e480 count:1 mapcount:0 mapping:ffff88812c26d800 index:0x0 compound_mapcount: 0 [ 48.321337] flags: 0x1fffc0000008100(slab|head) [ 48.326022] raw: 01fffc0000008100 ffffea0002963308 ffffea0002072088 ffff88812c26d800 [ 48.333892] raw: 0000000000000000 ffff8880a5f92340 0000000100000001 0000000000000000 [ 48.341763] page dumped because: kasan: bad access detected [ 48.347457] [ 48.349074] Memory state around the buggy address: [ 48.353994] ffff8880a5f93300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.361460] ffff8880a5f93380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.368806] >ffff8880a5f93400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.376144] ^ [ 48.379755] ffff8880a5f93480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.387096] ffff8880a5f93500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.394446] ================================================================== [ 48.401786] Disabling lock debugging due to kernel taint [ 48.409842] Kernel panic - not syncing: panic_on_warn set ... [ 48.409842] [ 48.417396] CPU: 1 PID: 7507 Comm: syz-executor125 Tainted: G B 4.19.75 #0 [ 48.425692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.435026] Call Trace: [ 48.437599] dump_stack+0x172/0x1f0 [ 48.441209] ? pids_release+0x228/0x250 [ 48.445168] panic+0x263/0x507 [ 48.448347] ? __warn_printk+0xf3/0xf3 [ 48.452217] ? pids_release+0x228/0x250 [ 48.456177] ? preempt_schedule+0x4b/0x60 [ 48.462919] ? ___preempt_schedule+0x16/0x18 [ 48.467311] ? trace_hardirqs_on+0x5e/0x220 [ 48.471615] ? pids_release+0x228/0x250 [ 48.475572] kasan_end_report+0x47/0x4f [ 48.479526] kasan_report.cold+0xa9/0x2ba [ 48.483674] __asan_report_load8_noabort+0x14/0x20 [ 48.488585] pids_release+0x228/0x250 [ 48.492366] cgroup_release+0x101/0x4a0 [ 48.496321] ? proc_tid_base_readdir+0x30/0x30 [ 48.500884] ? cgroup_exit+0x520/0x520 [ 48.504753] ? kasan_check_read+0x11/0x20 [ 48.508885] release_task+0x194/0x1630 [ 48.512754] ? _raw_spin_unlock_irq+0x28/0x90 [ 48.517232] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.521797] ? trace_hardirqs_on+0x67/0x220 [ 48.526101] wait_consider_task+0x2c95/0x3910 [ 48.530590] ? release_task+0x1630/0x1630 [ 48.534732] ? lock_acquire+0x16f/0x3f0 [ 48.538686] ? do_wait+0x3aa/0x9d0 [ 48.542210] ? kasan_check_write+0x14/0x20 [ 48.546434] do_wait+0x439/0x9d0 [ 48.549783] ? wait_consider_task+0x3910/0x3910 [ 48.554435] kernel_wait4+0x171/0x290 [ 48.558217] ? __ia32_sys_waitid+0x140/0x140 [ 48.562607] ? task_stopped_code+0x180/0x180 [ 48.567011] ? find_held_lock+0x35/0x130 [ 48.571055] ? __do_page_fault+0x676/0xe90 [ 48.575275] __do_sys_wait4+0x147/0x160 [ 48.579230] ? kernel_wait4+0x290/0x290 [ 48.583187] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.588706] ? up_read+0x1a/0x110 [ 48.592140] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.597657] ? __do_page_fault+0x484/0xe90 [ 48.601962] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.606699] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.611450] ? do_syscall_64+0x26/0x620 [ 48.615418] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.620760] ? do_syscall_64+0x26/0x620 [ 48.624715] __x64_sys_wait4+0x97/0xf0 [ 48.628587] do_syscall_64+0xfd/0x620 [ 48.632371] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.637551] RIP: 0033:0x40200a [ 48.640727] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 05 2e 8b 2d 00 85 c0 75 36 45 31 d2 48 63 d2 48 63 ff b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 d0 ff ff ff f7 [ 48.659616] RSP: 002b:00007ffcc5e510b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d [ 48.667316] RAX: ffffffffffffffda RBX: 0000000000001d54 RCX: 000000000040200a [ 48.674576] RDX: 0000000040000000 RSI: 00007ffcc5e510c4 RDI: ffffffffffffffff [ 48.681831] RBP: 00000000006d3018 R08: 0000000000000000 R09: 0000555556079880 [ 48.689088] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402fc0 [ 48.696351] R13: 0000000000403050 R14: 0000000000000000 R15: 0000000000000000 [ 48.704978] Kernel Offset: disabled [ 48.708627] Rebooting in 86400 seconds..