[ 39.579435][ T26] audit: type=1800 audit(1554405322.399:25): pid=7712 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.615750][ T26] audit: type=1800 audit(1554405322.399:26): pid=7712 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.644011][ T26] audit: type=1800 audit(1554405322.399:27): pid=7712 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.664625][ T26] audit: type=1800 audit(1554405322.409:28): pid=7712 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.150599][ T7863] check_preemption_disabled: 2 callbacks suppressed [ 69.150611][ T7863] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor103/7863 [ 69.166790][ T7863] caller is ip6_finish_output+0x335/0xdc0 [ 69.172580][ T7863] CPU: 1 PID: 7863 Comm: syz-executor103 Not tainted 5.1.0-rc2+ #121 [ 69.180628][ T7863] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.190675][ T7863] Call Trace: [ 69.193955][ T7863] dump_stack+0x172/0x1f0 [ 69.198274][ T7863] __this_cpu_preempt_check+0x246/0x270 [ 69.203818][ T7863] ip6_finish_output+0x335/0xdc0 [ 69.208759][ T7863] ip6_output+0x235/0x7f0 [ 69.213123][ T7863] ? ip6_finish_output+0xdc0/0xdc0 [ 69.218245][ T7863] ? ip6_fragment+0x38b0/0x38b0 [ 69.223118][ T7863] ? kasan_check_read+0x11/0x20 [ 69.227965][ T7863] ip6_xmit+0xe41/0x20c0 [ 69.232201][ T7863] ? ip6_finish_output2+0x2550/0x2550 [ 69.237561][ T7863] ? mark_held_locks+0xf0/0xf0 [ 69.242312][ T7863] ? ip6_setup_cork+0x1870/0x1870 [ 69.247335][ T7863] sctp_v6_xmit+0x313/0x660 [ 69.251835][ T7863] sctp_packet_transmit+0x1bc4/0x36f0 [ 69.257203][ T7863] ? sctp_packet_config+0xfe0/0xfe0 [ 69.262394][ T7863] ? sctp_packet_append_chunk+0x946/0xda0 [ 69.268104][ T7863] ? sctp_outq_select_transport+0x21a/0x790 [ 69.273991][ T7863] sctp_outq_flush_ctrl.constprop.0+0x6d4/0xd50 [ 69.280249][ T7863] ? sctp_prsctp_prune_sent.isra.0+0x820/0x820 [ 69.286421][ T7863] ? lock_downgrade+0x880/0x880 [ 69.291268][ T7863] ? add_timer+0x450/0xbe0 [ 69.295696][ T7863] ? find_held_lock+0x35/0x130 [ 69.300455][ T7863] ? add_timer+0x463/0xbe0 [ 69.304880][ T7863] sctp_outq_flush+0xe8/0x2780 [ 69.309633][ T7863] ? mark_held_locks+0xa4/0xf0 [ 69.314386][ T7863] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 69.320182][ T7863] ? add_timer+0x463/0xbe0 [ 69.324583][ T7863] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 69.330401][ T7863] ? lockdep_hardirqs_on+0x418/0x5d0 [ 69.335683][ T7863] ? trace_hardirqs_on+0x67/0x230 [ 69.340699][ T7863] ? __sctp_outq_teardown+0xc60/0xc60 [ 69.346085][ T7863] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 69.352315][ T7863] ? sctp_outq_tail+0x68c/0x930 [ 69.357161][ T7863] sctp_outq_uncork+0x6c/0x80 [ 69.361835][ T7863] sctp_do_sm+0x559/0x53e0 [ 69.366242][ T7863] ? sctp_do_8_2_transport_strike.isra.0+0x940/0x940 [ 69.372964][ T7863] ? __local_bh_enable_ip+0x15a/0x270 [ 69.378413][ T7863] ? lock_downgrade+0x880/0x880 [ 69.383308][ T7863] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.389626][ T7863] ? kasan_check_read+0x11/0x20 [ 69.394544][ T7863] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.400817][ T7863] ? sctp_hash_transport+0x10b/0x18d0 [ 69.406223][ T7863] ? memcpy+0x46/0x50 [ 69.410198][ T7863] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.416450][ T7863] ? sctp_assoc_set_primary+0x274/0x310 [ 69.421991][ T7863] sctp_primitive_ASSOCIATE+0x9d/0xd0 [ 69.427362][ T7863] __sctp_connect+0x8cd/0xce0 [ 69.432214][ T7863] ? sctp_sendmsg_to_asoc+0x17b0/0x17b0 [ 69.437773][ T7863] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 69.444007][ T7863] ? sctp_get_port+0x10e/0x180 [ 69.448758][ T7863] ? sctp_get_port_local+0x1670/0x1670 [ 69.454210][ T7863] ? __local_bh_enable_ip+0x15a/0x270 [ 69.459569][ T7863] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 69.465451][ T7863] sctp_inet_connect+0x2a2/0x350 [ 69.470385][ T7863] __sys_connect+0x266/0x330 [ 69.474965][ T7863] ? __ia32_sys_accept+0xb0/0xb0 [ 69.479899][ T7863] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.485347][ T7863] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.490800][ T7863] ? do_syscall_64+0x26/0x610 [ 69.495479][ T7863] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.501532][ T7863] ? do_syscall_64+0x26/0x610 [ 69.506200][ T7863] __x64_sys_connect+0x73/0xb0 [ 69.510984][ T7863] do_syscall_64+0x103/0x610 [ 69.515566][ T7863] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.521441][ T7863] RIP: 0033:0x440189 [ 69.525321][ T7863] 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 [ 69.544916][ T7863] RSP: 002b:00007ffd9b8d5e98 EFLAGS: 00000246 ORIG_RAX: 000000000000