[ 39.082395][ T26] audit: type=1800 audit(1552927156.562:25): pid=7771 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.118914][ T26] audit: type=1800 audit(1552927156.562:26): pid=7771 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.140978][ T26] audit: type=1800 audit(1552927156.562:27): pid=7771 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 51.458427][ T7946] [ 51.460874][ T7946] ============================= [ 51.465839][ T7946] WARNING: suspicious RCU usage [ 51.470722][ T7946] 5.1.0-rc1-next-20190318 #5 Not tainted [ 51.476454][ T7946] ----------------------------- [ 51.481324][ T7946] net/xfrm/xfrm_user.c:1080 suspicious rcu_dereference_check() usage! [ 51.489792][ T7946] [ 51.489792][ T7946] other info that might help us debug this: [ 51.489792][ T7946] [ 51.500319][ T7946] [ 51.500319][ T7946] rcu_scheduler_active = 2, debug_locks = 1 [ 51.508485][ T7946] 1 lock held by syz-executor085/7946: [ 51.514312][ T7946] #0: 00000000a55031b5 (&net->xfrm.xfrm_cfg_mutex){+.+.}, at: xfrm_netlink_rcv+0x61/0x90 [ 51.524847][ T7946] [ 51.524847][ T7946] stack backtrace: [ 51.530741][ T7946] CPU: 0 PID: 7946 Comm: syz-executor085 Not tainted 5.1.0-rc1-next-20190318 #5 [ 51.539763][ T7946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.549819][ T7946] Call Trace: [ 51.553105][ T7946] dump_stack+0x172/0x1f0 [ 51.557427][ T7946] lockdep_rcu_suspicious+0x153/0x15d [ 51.562793][ T7946] xfrm_alloc_userspi+0x7d5/0xa80 [ 51.567816][ T7946] ? xfrm_state_netlink+0x140/0x140 [ 51.573009][ T7946] ? nla_parse+0x45/0x60 [ 51.577245][ T7946] ? xfrm_state_netlink+0x140/0x140 [ 51.582457][ T7946] xfrm_user_rcv_msg+0x458/0x770 [ 51.587391][ T7946] ? xfrm_dump_sa_done+0xf0/0xf0 [ 51.592332][ T7946] ? mark_held_locks+0xf0/0xf0 [ 51.597109][ T7946] ? save_stack+0xa9/0xd0 [ 51.601441][ T7946] ? __mutex_lock+0x3cd/0x1310 [ 51.606217][ T7946] ? xfrm_netlink_rcv+0x61/0x90 [ 51.611065][ T7946] netlink_rcv_skb+0x17a/0x460 [ 51.615821][ T7946] ? xfrm_dump_sa_done+0xf0/0xf0 [ 51.620748][ T7946] ? netlink_ack+0xb50/0xb50 [ 51.625348][ T7946] xfrm_netlink_rcv+0x70/0x90 [ 51.630016][ T7946] netlink_unicast+0x536/0x720 [ 51.634801][ T7946] ? netlink_attachskb+0x770/0x770 [ 51.639907][ T7946] ? _copy_from_iter_full+0x259/0x8f0 [ 51.645272][ T7946] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 51.650992][ T7946] ? __check_object_size+0x3d/0x42f [ 51.656185][ T7946] netlink_sendmsg+0x8ae/0xd70 [ 51.660943][ T7946] ? netlink_unicast+0x720/0x720 [ 51.665875][ T7946] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 51.671410][ T7946] ? apparmor_socket_sendmsg+0x2a/0x30 [ 51.676866][ T7946] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.683103][ T7946] ? security_socket_sendmsg+0x93/0xc0 [ 51.688559][ T7946] ? netlink_unicast+0x720/0x720 [ 51.693494][ T7946] sock_sendmsg+0xdd/0x130 [ 51.697905][ T7946] ___sys_sendmsg+0x806/0x930 [ 51.702583][ T7946] ? copy_msghdr_from_user+0x430/0x430 [ 51.708060][ T7946] ? __thp_get_unmapped_area+0x190/0x190 [ 51.713691][ T7946] ? __lock_acquire+0x548/0x3fb0 [ 51.718648][ T7946] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.724888][ T7946] ? __handle_mm_fault+0x7cd/0x3ec0 [ 51.730103][ T7946] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.736343][ T7946] ? __fget_light+0x1a9/0x230 [ 51.741024][ T7946] ? __fdget+0x1b/0x20 [ 51.745092][ T7946] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.751332][ T7946] __sys_sendmsg+0x105/0x1d0 [ 51.755923][ T7946] ? __ia32_sys_shutdown+0x80/0x80 [ 51.761040][ T7946] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 51.766497][ T7946] ? do_syscall_64+0x26/0x610 [ 51.771169][ T7946] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.777235][ T7946] ? do_syscall_64+0x26/0x610 [ 51.781914][ T7946] __x64_sys_sendmsg+0x78/0xb0 [ 51.786679][ T7946] do_syscall_64+0x103/0x610 [ 51.791272][ T7946] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.797161][ T7946] RIP: 0033:0x440499 [ 51.801052][ T7946] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 51.820651][ T7946] RSP: 002b:00007ffcf12caf08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 51.829059][ T7946] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440499 [ 51.837030][ T7946] RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000003 [ 51.844997][ T7946] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 51.852966][ T7946] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040