FYI, we noticed the following commit (built with gcc-7): commit: 9cec47b8fd9372bcacd2f3bd8b0c71fa11e5aadd ("platform/x86: Add SoCWatch driver for v2.7") 2018-09-14 14:50:18 in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-x86_64 -enable-kvm -m 256M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +----------------------------------------------------------------+-----------+------------+ | | v4.19-rc2 | 9cec47b8fd | +----------------------------------------------------------------+-----------+------------+ | boot_successes | 25 | 0 | | boot_failures | 0 | 10 | | WARNING:Could_NOT_find_tracepoint_structs_for_some_tracepoints | 0 | 10 | +----------------------------------------------------------------+-----------+------------+ [ 163.532133] WARNING: Could NOT find tracepoint structs for some tracepoints! [ 163.537486] ----------------------------------------- [ 163.544350] OK: LOADED SoC Watch Driver [ 163.547628] ----------------------------------------- [ 163.551363] socperf2_0: SocPerf Driver loading... [ 163.555287] socperf2_0: SocPerf Driver about to register chrdev... [ 163.562722] socperf2_0: SocPerf Driver: result of alloc_chrdev_region is 0 [ 163.567416] socperf2_0: SocPerf Driver: major number is 500 [ 163.572793] socperf2_0: SocPerf Driver: detected 1 CPUs in lwpmudrv_Load [ 163.581056] socperf2_0: SocPerf Driver v2.0.0 has been loaded. [ 163.594922] cros_ec_lpcs: unsupported system. [ 163.599044] hv_vmbus: registering driver hv_balloon [ 163.660451] fake-fmc-carrier: mezzanine 0 [ 163.665082] Manufacturer: fake-vendor [ 163.667904] Product name: fake-design-for-testing [ 163.672531] fmc fake-design-for-testing-f001: Driver has no ID: matches all [ 163.678155] fmc_trivial: probe of fake-design-for-testing-f001 failed with error -95 [ 163.683343] fmc fake-design-for-testing-f001: Driver has no ID: matches all [ 163.687857] fmc_write_eeprom fake-design-for-testing-f001: fmc_write_eeprom: no busid passed, refusing all cards [ 163.695438] fmc fake-design-for-testing-f001: Driver has no ID: matches all [ 163.711196] fmc_chardev fake-design-for-testing-f001: Created misc device "fake-design-for-testing-f001" [ 163.724622] gnss: GNSS driver registered with major 497 [ 163.763394] no UART detected at 0x1 [ 163.780757] sc6000: specify IO port [ 163.789617] isa ad1848.0: please specify port [ 163.795130] isa cs4231.0: please specify port [ 163.812968] isa azt2316.0: please specify port [ 163.823942] ALSA gus_main.c:180 gus: can't grab synth port 0x320 [ 163.919693] Error: Driver 'msnd_pinnacle' is already registered, aborting... [ 163.926724] isa sb8.0: please specify irq [ 163.935061] ALSA jazz16.c:191 please specify port [ 163.986414] pktgen: Packet Generator for packet performance testing. Version: 2.75 [ 164.000827] drop_monitor: Initializing network drop monitor service [ 164.006454] NET: Registered protocol family 26 [ 164.009318] GACT probability on [ 164.011954] Mirror/redirect action on [ 164.019640] netem: version 1.3 [ 164.022154] u32 classifier [ 164.023991] Actions configured [ 164.031243] IPVS: Registered protocols () [ 164.040958] IPVS: Connection hash table configured (size=4096, memory=32Kbytes) [ 164.048032] IPVS: ipvs loaded. [ 164.050273] IPVS: [wrr] scheduler registered. [ 164.052853] IPVS: [lc] scheduler registered. [ 164.055524] IPVS: [wlc] scheduler registered. [ 164.058342] IPVS: [fo] scheduler registered. [ 164.060761] IPVS: [ovf] scheduler registered. [ 164.063236] IPVS: [lblc] scheduler registered. [ 164.065577] IPVS: [dh] scheduler registered. [ 164.068005] IPVS: [mh] scheduler registered. [ 164.070726] IPVS: [nq] scheduler registered. [ 164.073632] ipip: IPv4 and MPLS over IPv4 tunneling driver [ 164.080362] gre: GRE over IPv4 demultiplexor driver [ 164.085023] Initializing XFRM netlink socket [ 164.112962] NET: Registered protocol family 17 [ 164.116194] NET: Registered protocol family 15 [ 164.124665] NET: Registered protocol family 9 [ 164.128123] X25: Linux Version 0.2 [ 164.131649] Bluetooth: RFCOMM socket layer initialized [ 164.135602] Bluetooth: RFCOMM ver 1.11 [ 164.143395] NET: Registered protocol family 41 [ 164.148322] lec:lane_module_init: lec.c: initialized [ 164.151648] NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team [ 164.158415] DECnet: Routing cache hash table of 256 buckets, 9Kbytes [ 164.162726] NET: Registered protocol family 12 [ 164.165495] NET: Registered protocol family 35 [ 164.171605] sctp: Hash tables configured (bind 64/113) [ 164.178324] 9pnet: Installing 9P2000 support [ 164.181137] NET: Registered protocol family 37 [ 164.184880] NET: Registered protocol family 36 [ 164.187937] Key type dns_resolver registered [ 164.190877] Key type ceph registered [ 164.196997] libceph: loaded (mon/osd proto 15/24) [ 164.200110] openvswitch: Open vSwitch switching datapath [ 164.208848] NET: Registered protocol family 40 [ 164.211909] mpls_gso: MPLS GSO support [ 164.225357] RAS: Correctable Errors collector initialized. [ 164.228670] ... APIC ID: 00000000 (0) [ 164.230923] ... APIC VERSION: 01050014 [ 164.232299] 0000000000000000000000000000000000000000000000000000000000000000 [ 164.232299] 0000000000000018000000000000000000000000000000000000000000000000 [ 164.232299] 0000000000000000000000000000000000000000000000000000000000001000 [ 164.242999] number of MP IRQ sources: 15. [ 164.245049] number of IO-APIC #0 registers: 24. [ 164.247100] testing the IO APIC....................... [ 164.249320] IO APIC #0...... [ 164.250932] .... register #00: 00000000 [ 164.252878] ....... : physical APIC id: 00 [ 164.254888] ....... : Delivery Type: 0 [ 164.256750] ....... : LTS : 0 [ 164.258512] .... register #01: 00170011 [ 164.261129] ....... : max redirection entries: 17 [ 164.263590] ....... : PRQ implemented: 0 [ 164.265674] ....... : IO APIC version: 11 [ 164.268247] .... register #02: 00000000 [ 164.270252] ....... : arbitration: 00 [ 164.272334] .... IRQ redirection table: [ 164.274435] IOAPIC 0: [ 164.276123] pin00, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) [ 164.280137] pin01, enabled , edge , high, V(28), IRR(0), S(0), logical , D(01), M(0) [ 164.283742] pin02, enabled , edge , high, V(30), IRR(0), S(0), logical , D(01), M(0) To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, eywa