Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 4d1fb7cde0ccc6000cafb72d9079de1504e3cb2a ("ethtool: add a stricter length check") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: packetdrill version: packetdrill-x86_64-75fe342-1_20210508 with following parameters: ucode: 0xde on test machine: 4 threads 1 sockets Intel(R) Core(TM) i7-7567U CPU @ 3.50GHz with 32G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; kern :warn : [ 27.338203] WARNING: CPU: 1 PID: 3472 at net/ethtool/netlink.c:360 ethnl_default_doit (kbuild/src/consumer/net/ethtool/netlink.c:360 (discriminator 3)) kern :warn : [ 27.338878] Modules linked in: tun netconsole btrfs blake2b_generic xor zstd_compress raid6_pq libcrc32c sd_mod t10_pi sg intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp i915 coretemp intel_gtt kvm_intel drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops kvm intel_wmi_thunderbolt irqbypass crct10dif_pclmul wmi_bmof crc32_pclmul crc32c_intel ahci drm libahci mei_me ghash_clmulni_intel rapl intel_cstate libata mei intel_uncore rtsx_pci ipmi_devintf ipmi_msghandler wmi intel_pch_thermal video intel_pmc_core acpi_pad ip_tables kern :warn : [ 27.342493] CPU: 1 PID: 3472 Comm: ethtool Not tainted 5.13.0-rc3-01678-g4d1fb7cde0cc #1 kern :warn : [ 27.343095] Hardware name: Intel Corporation NUC7i7BNH/NUC7i7BNB, BIOS BNKBL357.86A.0067.2018.0814.1500 08/14/2018 kern :warn : [ 27.343860] RIP: 0010:ethnl_default_doit (kbuild/src/consumer/net/ethtool/netlink.c:360 (discriminator 3)) kern :warn : [ 27.344240] Code: 80 3d e0 da 29 01 00 0f 85 c1 fe ff ff 44 89 e2 44 89 f6 4c 89 04 24 48 c7 c7 70 7d 62 82 c6 05 c2 da 29 01 01 e8 d8 8a 18 00 <0f> 0b 4c 8b 04 24 e9 99 fe ff ff 41 bc f4 ff ff ff e9 67 ff ff ff All code ======== 0: 80 3d e0 da 29 01 00 cmpb $0x0,0x129dae0(%rip) # 0x129dae7 7: 0f 85 c1 fe ff ff jne 0xfffffffffffffece d: 44 89 e2 mov %r12d,%edx 10: 44 89 f6 mov %r14d,%esi 13: 4c 89 04 24 mov %r8,(%rsp) 17: 48 c7 c7 70 7d 62 82 mov $0xffffffff82627d70,%rdi 1e: c6 05 c2 da 29 01 01 movb $0x1,0x129dac2(%rip) # 0x129dae7 25: e8 d8 8a 18 00 callq 0x188b02 2a:* 0f 0b ud2 <-- trapping instruction 2c: 4c 8b 04 24 mov (%rsp),%r8 30: e9 99 fe ff ff jmpq 0xfffffffffffffece 35: 41 bc f4 ff ff ff mov $0xfffffff4,%r12d 3b: e9 67 ff ff ff jmpq 0xffffffffffffffa7 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 4c 8b 04 24 mov (%rsp),%r8 6: e9 99 fe ff ff jmpq 0xfffffffffffffea4 b: 41 bc f4 ff ff ff mov $0xfffffff4,%r12d 11: e9 67 ff ff ff jmpq 0xffffffffffffff7d kern :warn : [ 27.345616] RSP: 0000:ffffc90002b3fb48 EFLAGS: 00010286 kern :warn : [ 27.346011] RAX: 0000000000000000 RBX: ffffffff822faf60 RCX: 0000000000000027 kern :warn : [ 27.346548] RDX: 0000000000000027 RSI: 00000000ffff7fff RDI: ffff88887ec97bf8 kern :warn : [ 27.347080] RBP: ffff888879b35e60 R08: ffff88887ec97bf0 R09: ffffc90002b3f968 kern :warn : [ 27.347618] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000000008bc kern :warn : [ 27.348153] R13: ffffc90002b3fbb0 R14: 0000000000000001 R15: ffff888879f47e00 kern :warn : [ 27.348689] FS: 00007fad89e55740(0000) GS:ffff88887ec80000(0000) knlGS:0000000000000000 kern :warn : [ 27.349300] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [ 27.349733] CR2: 0000000000517868 CR3: 000000087a29e005 CR4: 00000000003706e0 kern :warn : [ 27.350272] Call Trace: kern :warn : [ 27.350475] genl_family_rcv_msg_doit+0xef/0x180 kern :warn : [ 27.350876] genl_rcv_msg (kbuild/src/consumer/net/netlink/genetlink.c:783 kbuild/src/consumer/net/netlink/genetlink.c:800) kern :warn : [ 27.351154] ? ethnl_reply_init (kbuild/src/consumer/net/ethtool/netlink.c:313) kern :warn : [ 27.351481] ? ethnl_default_parse (kbuild/src/consumer/net/ethtool/netlink.c:486) kern :warn : [ 27.351810] ? ethnl_fill_reply_header (kbuild/src/consumer/net/ethtool/netlink.c:313) kern :warn : [ 27.352226] ? __ethtool_get_ts_info (kbuild/src/consumer/net/ethtool/netlink.c:541) kern :warn : [ 27.352564] ? genl_family_rcv_msg_doit+0x180/0x180 kern :warn : [ 27.352978] netlink_rcv_skb (kbuild/src/consumer/net/netlink/af_netlink.c:2504) kern :warn : [ 27.353279] genl_rcv (kbuild/src/consumer/net/netlink/genetlink.c:812) kern :warn : [ 27.353527] netlink_unicast (kbuild/src/consumer/net/netlink/af_netlink.c:1315 kbuild/src/consumer/net/netlink/af_netlink.c:1340) kern :warn : [ 27.353831] netlink_sendmsg (kbuild/src/consumer/net/netlink/af_netlink.c:1929) kern :warn : [ 27.354135] sock_sendmsg (kbuild/src/consumer/net/socket.c:654 kbuild/src/consumer/net/socket.c:674) kern :warn : [ 27.354411] __sys_sendto (kbuild/src/consumer/net/socket.c:1977) kern :warn : [ 27.354690] ? __sys_recvmsg (kbuild/src/consumer/include/linux/file.h:32 kbuild/src/consumer/net/socket.c:2643) kern :warn : [ 27.354979] ? exit_to_user_mode_prepare (kbuild/src/consumer/kernel/entry/common.c:207) kern :warn : [ 27.355352] __x64_sys_sendto (kbuild/src/consumer/net/socket.c:1989 kbuild/src/consumer/net/socket.c:1985 kbuild/src/consumer/net/socket.c:1985) kern :warn : [ 27.355646] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:47) kern :warn : [ 27.355926] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112) kern :warn : [ 27.356321] RIP: 0033:0x7fad89f529b7 kern :warn : [ 27.356601] Code: 64 89 02 48 c7 c0 ff ff ff ff eb b6 0f 1f 80 00 00 00 00 48 8d 05 49 5d 0c 00 41 89 ca 8b 00 85 c0 75 10 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 71 c3 41 57 4d 89 c7 41 56 41 89 ce 41 55 49 All code ======== 0: 64 89 02 mov %eax,%fs:(%rdx) 3: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax a: eb b6 jmp 0xffffffffffffffc2 c: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 13: 48 8d 05 49 5d 0c 00 lea 0xc5d49(%rip),%rax # 0xc5d63 1a: 41 89 ca mov %ecx,%r10d 1d: 8b 00 mov (%rax),%eax 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 2c 00 00 00 mov $0x2c,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 71 ja 0xa3 32: c3 retq 33: 41 57 push %r15 35: 4d 89 c7 mov %r8,%r15 38: 41 56 push %r14 3a: 41 89 ce mov %ecx,%r14d 3d: 41 55 push %r13 3f: 49 rex.WB Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 71 ja 0x79 8: c3 retq 9: 41 57 push %r15 b: 4d 89 c7 mov %r8,%r15 e: 41 56 push %r14 10: 41 89 ce mov %ecx,%r14d 13: 41 55 push %r13 15: 49 rex.WB kern :warn : [ 27.358004] RSP: 002b:00007ffecb6e28e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c kern :warn : [ 27.358584] RAX: ffffffffffffffda RBX: 000055db102fd2f0 RCX: 00007fad89f529b7 kern :warn : [ 27.359127] RDX: 0000000000000028 RSI: 000055db102fd360 RDI: 0000000000000008 kern :warn : [ 27.359669] RBP: 000055db102fd360 R08: 00007fad8a01cbe0 R09: 000000000000000c kern :warn : [ 27.360211] R10: 0000000000000000 R11: 0000000000000246 R12: 000055db0ef89d70 kern :warn : [ 27.360752] R13: 000055db102fd300 R14: 00007ffecb6e29b0 R15: 000055db0ef96073 kern :warn : [ 27.361301] ---[ end trace 5751ea12d76fbf29 ]--- user :err : [ 28.549439] 18 Jun 21:13:00 ntpdate[401]: no server suitable for synchronization found user :err : [ 33.170516] cwnd-moderation-ecn-enter-cwr-no-moderation-700.pkt:24: error in Python code user :err : [ 33.171942] Traceback (most recent call last): user :err : [ 33.173384] File "/tmp/code_x2li9Z", line 195, in <module> user :err : [ 33.174817] assert tcpi_snd_cwnd == 4, tcpi_snd_cwnd user :err : [ 33.175709] AssertionError: 5 user :notice: [ 36.022826] result_service: raw_upload, RESULT_MNT: /internal-lkp-server/result, RESULT_ROOT: /internal-lkp-server/result/packetdrill/ucode=0xde/lkp-kbl-nuc1/debian-10.4-x86_64-20200603.cgz/x86_64-rhel-8.3/gcc-9/4d1fb7cde0ccc6000cafb72d9079de1504e3cb2a/3, TMP_RESULT_ROOT: /tmp/lkp/result user :notice: [ 36.027813] run-job /lkp/jobs/scheduled/lkp-kbl-nuc1/packetdrill-ucode=0xde-debian-10.4-x86_64-20200603.cgz-4d1fb7cde0ccc6000cafb72d9079de1504e3cb2a-20210619-26615-19d8agt-3.yaml user :err : [ 36.210266] cwnd-moderation-ecn-enter-cwr-no-moderation-700.pkt: error executing code: '/usr/bin/python' returned non-zero status 1 user :notice: [ 37.041161] /usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_fil... -O /dev/null user :notice: [ 37.043739] target ucode: 0xde user :notice: [ 37.044812] current_version: de, target_version: de user :notice: [ 37.046550] Running packetdrill/tests/bsd/fast_retransmit/fr-4pkt-sack-bsd.pkt ... user :notice: [ 37.049460] 2021-06-18 21:13:02 packetdrill/packetdrill --tolerance_usecs=40000 packetdrill/tests/bsd/fast_retransmit/fr-4pkt-sack-bsd.pkt user :notice: [ 37.053086] packetdrill/tests/bsd/fast_retransmit/fr-4pkt-sack-bsd.pkt:25: error handling packet: live packet payload: expected 1000 bytes vs actual 2000 bytes user :notice: [ 37.055352] packetdrill/tests/bsd/fast_retransmit/fr-4pkt-sack-bsd.pkt failed user :notice: [ 37.057296] Running packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt ... user :notice: [ 37.060307] 2021-06-18 21:13:02 packetdrill/packetdrill --tolerance_usecs=40000 packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt user :notice: [ 37.062516] packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt pass user :notice: [ 37.064264] Running packetdrill/tests/linux/packetdrill/socket_err.pkt ... user :notice: [ 37.066963] 2021-06-18 21:13:02 packetdrill/packetdrill --tolerance_usecs=40000 packetdrill/tests/linux/packetdrill/socket_err.pkt user :notice: [ 37.070773] packetdrill/tests/linux/packetdrill/socket_err.pkt:6: runtime error in socket call: Expected non-negative result but got -1 with errno 93 (Protocol not supported) user :notice: [ 37.072986] packetdrill/tests/linux/packetdrill/socket_err.pkt failed user :notice: [ 37.074760] Running packetdrill/tests/linux/packetdrill/socket_wrong_err.pkt ... user :notice: [ 37.077598] 2021-06-18 21:13:03 packetdrill/packetdrill --tolerance_usecs=40000 packetdrill/tests/linux/packetdrill/socket_wrong_err.pkt user :notice: [ 37.081422] packetdrill/tests/linux/packetdrill/socket_wrong_err.pkt:4: runtime error in socket call: Expected result -99 but got -1 with errno 93 (Protocol not supported) To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run bin/lkp run generated-yaml-file --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang