[....] Starting enhanced syslogd: rsyslogd[ 13.937521] audit: type=1400 audit(1517494634.978:4): avc: denied { syslog } for pid=3912 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.207' (ECDSA) to the list of known hosts. 2018/02/01 14:17:32 parsed 1 programs 2018/02/01 14:17:32 executed programs: 0 syzkaller login: [ 31.552859] IPVS: Creating netns size=2536 id=1 [ 31.584541] IPVS: Creating netns size=2536 id=2 [ 31.623736] IPVS: Creating netns size=2536 id=3 [ 31.667509] IPVS: Creating netns size=2536 id=4 [ 31.714879] IPVS: Creating netns size=2536 id=5 [ 31.766939] IPVS: Creating netns size=2536 id=6 [ 31.815113] IPVS: Creating netns size=2536 id=7 [ 31.875255] IPVS: Creating netns size=2536 id=8 [ 35.811150] [ 35.812855] =============================== [ 35.817173] [ INFO: suspicious RCU usage. ] [ 35.821520] 4.9.79-g71f1469 #25 Not tainted [ 35.825842] ------------------------------- [ 35.830161] ./include/linux/inetdevice.h:205 suspicious rcu_dereference_check() usage! [ 35.838225] [ 35.838225] other info that might help us debug this: [ 35.838225] [ 35.846391] [ 35.846391] rcu_scheduler_active = 2, debug_locks = 0 [ 35.853070] 2 locks held by syz-executor0/6565: [ 35.857731] #0: (((&im->timer))){+.-...}, at: [] call_timer_fn+0xe4/0x700 [ 35.866955] #1: (&(&im->lock)->rlock){+.-...}, at: [] igmpv3_send_report+0x39/0x480 [ 35.877067] [ 35.877067] stack backtrace: [ 35.881572] CPU: 0 PID: 6565 Comm: syz-executor0 Not tainted 4.9.79-g71f1469 #25 [ 35.889107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.898437] ffff8801db207968 ffffffff81d94829 ffff8801d3ad6000 0000000000000000 [ 35.906423] 0000000000000002 ffffffff83f2fe60 00000000160000e0 ffff8801db207998 [ 35.914404] ffffffff81238379 ffff8801d8348c80 ffff8801b19a4410 ffff8801bd575680 [ 35.922385] Call Trace: [ 35.924939] [ 35.926978] [] dump_stack+0xc1/0x128 [ 35.932333] [] lockdep_rcu_suspicious+0x139/0x180 [ 35.938800] [] igmpv3_newpack+0xc3c/0xe80 [ 35.944568] [] ? igmp_group_added+0x690/0x690 [ 35.950683] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 35.957666] [] add_grhead.isra.29+0x235/0x300 [ 35.963781] [] add_grec+0xae2/0x1010 [ 35.969232] [] ? igmpv3_sendpack+0x2c0/0x2c0 [ 35.975262] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 35.982247] [] igmpv3_send_report+0x7f/0x480 [ 35.988279] [] igmp_send_report+0x997/0xc90 [ 35.994223] [] ? igmp_gq_timer_expire+0x70/0x70 [ 36.000512] [] ? igmp_timer_expire+0x42/0x3d0 [ 36.006628] [] ? igmp_timer_expire+0xf2/0x3d0 [ 36.012743] [] igmp_timer_expire+0x29d/0x3d0 [ 36.018771] [] ? igmp_netdev_event+0x590/0x590 [ 36.024976] [] call_timer_fn+0x164/0x700 [ 36.030658] [] ? call_timer_fn+0xe4/0x700 [ 36.036531] [] ? process_timeout+0x20/0x20 [ 36.042387] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 36.048762] [] ? igmp_netdev_event+0x590/0x590 [ 36.054965] [] ? trace_hardirqs_on_caller+0x266/0x590 [ 36.061778] [] ? igmp_netdev_event+0x590/0x590 [ 36.067982] [] run_timer_softirq+0xe8c/0x1650 [ 36.074097] [] ? add_timer_on+0x940/0x940 [ 36.079866] [] ? lapic_next_event+0x5a/0x90 [ 36.085810] [] ? check_preemption_disabled+0x3b/0x200 [ 36.092619] [] ? check_preemption_disabled+0x3b/0x200 [ 36.099430] [] __do_softirq+0x206/0x951 [ 36.105028] [] ? sock_release+0x1e0/0x1e0 [ 36.110798] [] irq_exit+0x165/0x190 [ 36.116044] [] smp_apic_timer_interrupt+0x7b/0xa0 [ 36.122506] [] apic_timer_interrupt+0xa0/0xb0 [ 36.128620] [ 36.130660] [] ? sock_release+0x1e0/0x1e0 [ 36.136449] [] ? __fput+0x323/0x6e0 [ 36.141698] [] ? __fput+0x34c/0x6e0 [ 36.146945] [] ____fput+0x15/0x20 [ 36.152022] [] task_work_run+0x115/0x190 [ 36.157706] [] do_exit+0x7e7/0x2a40 [ 36.162958] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 36.169943] [] ? release_task+0x1240/0x1240 [ 36.175885] [] ? get_futex_key+0x1050/0x1050 [ 36.181915] [] ? __dequeue_signal+0xa3/0x550 [ 36.187944] [] ? recalc_sigpending+0x72/0x90 [ 36.193973] [] do_group_exit+0x108/0x320 [ 36.199658] [] get_signal+0x4d4/0x14e0 [ 36.205170] [] do_signal+0x87/0x1a00 [ 36.210504] [] ? setup_sigcontext+0x7d0/0x7d0 [ 36.216622] [] ? __do_page_fault+0x5ec/0xd40 [ 36.222649] [] ? SyS_futex+0x22e/0x2d0 [ 36.228159] [] ? __do_page_fault+0x3bd/0xd40 [ 36.234187] [] ? do_futex+0x15c0/0x15c0 [ 36.239790] [] ? exit_to_usermode_loop+0xac/0x120 [ 36.246253] [] exit_to_usermode_loop+0xe1/0x120 [ 36.252544] [] syscall_return_slowpath+0x1a0/0x1e0 [ 36.259095] [] entry_SYSCALL_64_fastpath+0xe6/0xe8 2018/02/01 14:17:37 executed programs: 339 2018/02/01 14:17:42 executed programs: 1504