[....] Starting enhanced syslogd: rsyslogd[ 12.271635] audit: type=1400 audit(1518095510.656:4): avc: denied { syslog } for pid=3623 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[ ok 8[?25h[?0c. [....] 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 Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.246312] ------------[ cut here ]------------ [ 48.251101] WARNING: CPU: 0 PID: 3795 at mm/page_alloc.c:3544 __alloc_pages_slowpath+0x1136/0x1d90 [ 48.260215] Kernel panic - not syncing: panic_on_warn set ... [ 48.260215] [ 48.267546] CPU: 0 PID: 3795 Comm: syzkaller914711 Not tainted 4.9.80-g20c8a00 #30 [ 48.275216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.284538] ffff8801d7937118 ffffffff81d94b69 ffffffff83a47c40 ffff8801d79371f0 [ 48.292498] ffffffff83aa4e00 ffffffff81452f16 0000000000000009 ffff8801d79371e0 [ 48.300460] ffffffff8142f541 0000000041b58ab3 ffffffff8418ab20 ffffffff8142f385 [ 48.308433] Call Trace: [ 48.310989] [] dump_stack+0xc1/0x128 [ 48.316325] [] ? __alloc_pages_slowpath+0x1136/0x1d90 [ 48.323137] [] panic+0x1bc/0x3a8 [ 48.328125] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 48.336322] [] ? load_image_and_restore+0xf9/0xf9 [ 48.342781] [] ? xfrm_user_rcv_msg+0x413/0x6a0 [ 48.348979] [] ? netlink_rcv_skb+0x13e/0x370 [ 48.355004] [] ? xfrm_netlink_rcv+0x6f/0x90 [ 48.360942] [] ? __warn+0x1a9/0x1e0 [ 48.366185] [] ? __alloc_pages_slowpath+0x1136/0x1d90 [ 48.372990] [] __warn+0x1c4/0x1e0 [ 48.378061] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 48.385042] [] warn_slowpath_null+0x2c/0x40 [ 48.390977] [] __alloc_pages_slowpath+0x1136/0x1d90 [ 48.397608] [] ? __lock_is_held+0xa1/0xf0 [ 48.403373] [] ? __lock_acquire+0x629/0x3640 [ 48.409401] [] ? md5_update+0x10a/0x150 [ 48.414992] [] ? gfp_pfmemalloc_allowed+0x110/0x110 [ 48.421627] [] ? get_page_from_freelist+0xcff/0x19f0 [ 48.428350] [] ? __might_sleep+0x95/0x1a0 [ 48.434114] [] __alloc_pages_nodemask+0x33b/0x6b0 [ 48.440572] [] ? __alloc_pages_slowpath+0x1d90/0x1d90 [ 48.447380] [] ? check_preemption_disabled+0x3b/0x200 [ 48.454187] [] kmalloc_order+0x2a/0x70 [ 48.459689] [] kmalloc_order_trace+0x1f/0x190 [ 48.465799] [] ? xfrm_get_mode.part.29+0x157/0x2a0 [ 48.472346] [] __kmalloc+0x19d/0x310 [ 48.477677] [] xfrm_add_sa+0x19ea/0x2e40 [ 48.483356] [] ? xfrm_send_state_notify+0x17d0/0x17d0 [ 48.490162] [] ? nla_parse+0x213/0x260 [ 48.495666] [] ? xfrm_send_state_notify+0x17d0/0x17d0 [ 48.502473] [] xfrm_user_rcv_msg+0x413/0x6a0 [ 48.508498] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 48.514525] [] netlink_rcv_skb+0x13e/0x370 [ 48.520375] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 48.526406] [] xfrm_netlink_rcv+0x6f/0x90 [ 48.532175] [] netlink_unicast+0x511/0x750 [ 48.538030] [] ? netlink_unicast+0x43c/0x750 [ 48.544057] [] ? netlink_attachskb+0x680/0x680 [ 48.550260] [] netlink_sendmsg+0x8e8/0xc50 [ 48.556116] [] ? netlink_unicast+0x750/0x750 [ 48.562140] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 48.568600] [] ? security_socket_sendmsg+0x89/0xb0 [ 48.575146] [] ? netlink_unicast+0x750/0x750 [ 48.581169] [] sock_sendmsg+0xca/0x110 [ 48.586671] [] ___sys_sendmsg+0x6d1/0x7e0 [ 48.592436] [] ? copy_msghdr_from_user+0x550/0x550 [ 48.598984] [] ? __lru_cache_add+0x187/0x250 [ 48.605011] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 48.612081] [] ? _raw_spin_unlock+0x2c/0x50 [ 48.618019] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 48.625084] [] ? handle_mm_fault+0x6ee/0x2530 [ 48.631196] [] ? __lock_is_held+0xa1/0xf0 [ 48.636959] [] ? __pmd_alloc+0x410/0x410 [ 48.642638] [] ? __fget_light+0x158/0x1e0 [ 48.648400] [] ? __fdget+0x18/0x20 [ 48.653555] [] __sys_sendmsg+0xd6/0x190 [ 48.659143] [] ? SyS_shutdown+0x1b0/0x1b0 [ 48.664906] [] ? __do_page_fault+0x5ec/0xd40 [ 48.670930] [] ? __do_page_fault+0x3bd/0xd40 [ 48.676956] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 48.683760] [] SyS_sendmsg+0x2d/0x50 [ 48.689090] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 48.696076] Dumping ftrace buffer: [ 48.699612] (ftrace buffer empty) [ 48.703292] Kernel Offset: disabled [ 48.706893] Rebooting in 86400 seconds..