[....] Starting enhanced syslogd: rsyslogd[ 12.198302] audit: type=1400 audit(1515468932.662:4): avc: denied { syslog } for pid=3168 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 '10.128.0.18' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.406347] ------------[ cut here ]------------ [ 34.411131] WARNING: CPU: 1 PID: 3341 at mm/page_alloc.c:3550 __alloc_pages_slowpath+0x1136/0x1d90 [ 34.420238] Kernel panic - not syncing: panic_on_warn set ... [ 34.420238] [ 34.427578] CPU: 1 PID: 3341 Comm: syzkaller148824 Not tainted 4.9.75-gb54d99a #8 [ 34.435170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.444506] ffff8801c92df118 ffffffff81d93049 ffffffff83a47180 ffff8801c92df1f0 [ 34.452457] ffffffff83aa4400 ffffffff81451c26 0000000000000009 ffff8801c92df1e0 [ 34.460408] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 34.468358] Call Trace: [ 34.470914] [] dump_stack+0xc1/0x128 [ 34.476248] [] ? __alloc_pages_slowpath+0x1136/0x1d90 [ 34.483052] [] panic+0x1bc/0x3a8 [ 34.488033] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 34.496228] [] ? load_image_and_restore+0xf9/0xf9 [ 34.502687] [] ? save_stack_trace+0x16/0x20 [ 34.508631] [] ? save_stack+0x43/0xd0 [ 34.514053] [] ? kasan_kmalloc+0xad/0xe0 [ 34.519730] [] ? __warn+0x1a9/0x1e0 [ 34.524990] [] ? __alloc_pages_slowpath+0x1136/0x1d90 [ 34.531811] [] __warn+0x1c4/0x1e0 [ 34.536894] [] ? netlink_sendmsg+0x8e8/0xc50 [ 34.542922] [] warn_slowpath_null+0x2c/0x40 [ 34.548861] [] __alloc_pages_slowpath+0x1136/0x1d90 [ 34.555504] [] ? xfrm_add_sa+0x1916/0x2e40 [ 34.561357] [] ? xfrm_user_rcv_msg+0x413/0x6a0 [ 34.567564] [] ? netlink_rcv_skb+0x13e/0x370 [ 34.573589] [] ? xfrm_netlink_rcv+0x6f/0x90 [ 34.579538] [] ? netlink_unicast+0x511/0x750 [ 34.585563] [] ? netlink_sendmsg+0x8e8/0xc50 [ 34.591586] [] ? sock_sendmsg+0xca/0x110 [ 34.597272] [] ? ___sys_sendmsg+0x6d1/0x7e0 [ 34.603214] [] ? __sys_sendmsg+0xd6/0x190 [ 34.608980] [] ? SyS_sendmsg+0x2d/0x50 [ 34.614485] [] ? __lock_acquire+0x629/0x3640 [ 34.620516] [] ? gfp_pfmemalloc_allowed+0x110/0x110 [ 34.627150] [] ? get_page_from_freelist+0xcff/0x19f0 [ 34.633870] [] ? __might_sleep+0x95/0x1a0 [ 34.639631] [] __alloc_pages_nodemask+0x33b/0x6b0 [ 34.646092] [] ? crypto_ahash_init_tfm+0x335/0x420 [ 34.652635] [] ? __alloc_pages_slowpath+0x1d90/0x1d90 [ 34.659440] [] ? check_preemption_disabled+0x3b/0x200 [ 34.666244] [] kmalloc_order+0x2a/0x70 [ 34.671749] [] kmalloc_order_trace+0x1f/0x190 [ 34.677862] [] ? xfrm_get_mode.part.29+0x157/0x2a0 [ 34.684410] [] __kmalloc+0x19d/0x310 [ 34.689742] [] xfrm_add_sa+0x19ea/0x2e40 [ 34.695418] [] ? xfrm_send_state_notify+0x17d0/0x17d0 [ 34.702228] [] ? nla_parse+0x213/0x260 [ 34.707732] [] ? xfrm_send_state_notify+0x17d0/0x17d0 [ 34.714537] [] xfrm_user_rcv_msg+0x413/0x6a0 [ 34.720558] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 34.726583] [] netlink_rcv_skb+0x13e/0x370 [ 34.732440] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 34.738482] [] xfrm_netlink_rcv+0x6f/0x90 [ 34.744247] [] netlink_unicast+0x511/0x750 [ 34.750097] [] ? netlink_unicast+0x43c/0x750 [ 34.756122] [] ? netlink_attachskb+0x680/0x680 [ 34.762325] [] netlink_sendmsg+0x8e8/0xc50 [ 34.768176] [] ? netlink_unicast+0x750/0x750 [ 34.774205] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 34.780671] [] ? security_socket_sendmsg+0x89/0xb0 [ 34.787230] [] ? netlink_unicast+0x750/0x750 [ 34.793255] [] sock_sendmsg+0xca/0x110 [ 34.798758] [] ___sys_sendmsg+0x6d1/0x7e0 [ 34.804524] [] ? copy_msghdr_from_user+0x550/0x550 [ 34.811070] [] ? __lru_cache_add+0x187/0x250 [ 34.817095] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 34.824160] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.830100] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 34.837173] [] ? handle_mm_fault+0x6ee/0x2530 [ 34.843285] [] ? __lock_is_held+0xa1/0xf0 [ 34.849046] [] ? __pmd_alloc+0x410/0x410 [ 34.854721] [] ? __fget_light+0x158/0x1e0 [ 34.860481] [] ? __fdget+0x18/0x20 [ 34.865636] [] __sys_sendmsg+0xd6/0x190 [ 34.871226] [] ? SyS_shutdown+0x1b0/0x1b0 [ 34.876993] [] ? __do_page_fault+0x5ec/0xd40 [ 34.883016] [] ? __do_page_fault+0x3bd/0xd40 [ 34.889038] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.895843] [] SyS_sendmsg+0x2d/0x50 [ 34.901170] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 34.908142] Dumping ftrace buffer: [ 34.911672] (ftrace buffer empty) [ 34.915349] Kernel Offset: disabled [ 34.918950] Rebooting in 86400 seconds..