Greeting, FYI, we noticed the following commit (built with gcc-9): commit: d7fa06e1aeccabc3a55332ff6c004eb17cc6b0d1 ("[RFC PATCH net-next 1/4] txhash: Make rethinking txhash behavior configurable via sysctl") url: https://github.com/0day-ci/linux/commits/Akhmat-Karakotov/txhash-Make-has... base: https://git.kernel.org/cgit/linux/kernel/git/davem/net.git 95a359c9553342d36d408d35331ff0bfce75272f patch link: https://lore.kernel.org/netdev/20211025203521.13507-2-hmukos@yandex-team.ru in testcase: ltp version: ltp-x86_64-14c1f76-1_20211101 with following parameters: disk: 1HDD fs: btrfs test: syscalls-05 ucode: 0xe2 test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features. test-url: http://linux-test-project.github.io/ on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz 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; [ 57.427758][ T2828] WARNING: CPU: 0 PID: 2828 at net/sysctl_net.c:155 register_net_sysctl (net/sysctl_net.c:155 net/sysctl_net.c:167) [ 57.436940][ T2828] Modules linked in: dm_mod btrfs ipmi_devintf ipmi_msghandler 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 coretemp i915 kvm_intel intel_gtt ttm drm_kms_helper kvm mei_wdt irqbypass syscopyarea crct10dif_pclmul sysfillrect crc32_pclmul ahci sysimgblt crc32c_intel libahci ghash_clmulni_intel wmi_bmof fb_sys_fops mei_me rapl drm libata intel_cstate intel_uncore mei intel_pch_thermal wmi video acpi_pad intel_pmc_core ip_tables [ 57.484640][ T2828] CPU: 0 PID: 2828 Comm: clone09 Tainted: G I 5.15.0-rc6-00193-gd7fa06e1aecc #1 [ 57.494841][ T2828] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.1.1 10/07/2015 [ 57.502950][ T2828] RIP: 0010:register_net_sysctl (net/sysctl_net.c:155 net/sysctl_net.c:167) [ 57.508626][ T2828] Code: 00 4c 89 f7 e8 51 8d 50 ff 48 c7 c1 4e b7 52 82 85 c0 74 c1 4c 8b 43 08 48 8b 13 4c 89 e6 48 c7 c7 40 2e 61 82 e8 82 8f 02 00 <0f> 0b 66 81 63 14 6d ff 48 8b 53 40 48 83 c3 40 48 85 d2 75 a3 5b All code ======== 0: 00 4c 89 f7 add %cl,-0x9(%rcx,%rcx,4) 4: e8 51 8d 50 ff callq 0xffffffffff508d5a 9: 48 c7 c1 4e b7 52 82 mov $0xffffffff8252b74e,%rcx 10: 85 c0 test %eax,%eax 12: 74 c1 je 0xffffffffffffffd5 14: 4c 8b 43 08 mov 0x8(%rbx),%r8 18: 48 8b 13 mov (%rbx),%rdx 1b: 4c 89 e6 mov %r12,%rsi 1e: 48 c7 c7 40 2e 61 82 mov $0xffffffff82612e40,%rdi 25: e8 82 8f 02 00 callq 0x28fac 2a:* 0f 0b ud2 <-- trapping instruction 2c: 66 81 63 14 6d ff andw $0xff6d,0x14(%rbx) 32: 48 8b 53 40 mov 0x40(%rbx),%rdx 36: 48 83 c3 40 add $0x40,%rbx 3a: 48 85 d2 test %rdx,%rdx 3d: 75 a3 jne 0xffffffffffffffe2 3f: 5b pop %rbx Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 66 81 63 14 6d ff andw $0xff6d,0x14(%rbx) 8: 48 8b 53 40 mov 0x40(%rbx),%rdx c: 48 83 c3 40 add $0x40,%rbx 10: 48 85 d2 test %rdx,%rdx 13: 75 a3 jne 0xffffffffffffffb8 15: 5b pop %rbx [ 57.528140][ T2828] RSP: 0018:ffffc90001987c68 EFLAGS: 00010286 [ 57.534088][ T2828] RAX: 0000000000000000 RBX: ffff88886e2f6e80 RCX: 0000000000000000 [ 57.541938][ T2828] RDX: ffff88881ac239c0 RSI: ffff88881ac17b50 RDI: ffff88881ac17b50 [ 57.549784][ T2828] RBP: ffff88886f030000 R08: ffff88881ac17b50 R09: ffffc90001987a88 [ 57.557634][ T2828] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff826026b9 [ 57.565486][ T2828] R13: ffff88886e2f6e40 R14: ffffffff82d617ec R15: ffff88886dac5080 [ 57.573350][ T2828] FS: 00007f0944fa25c0(0000) GS:ffff88881ac00000(0000) knlGS:0000000000000000 [ 57.582155][ T2828] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.588628][ T2828] CR2: 00007f0944ddd008 CR3: 0000000863f22001 CR4: 00000000003706f0 [ 57.596477][ T2828] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.604326][ T2828] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.612180][ T2828] Call Trace: [ 57.615330][ T2828] sysctl_core_net_init (net/core/sysctl_net_core.c:640) [ 57.620310][ T2828] ops_init (net/core/net_namespace.c:140) [ 57.624242][ T2828] setup_net (net/core/net_namespace.c:326) [ 57.628364][ T2828] copy_net_ns (net/core/net_namespace.c:475) [ 57.632645][ T2828] create_new_namespaces+0xfb/0x2c0 [ 57.638319][ T2828] copy_namespaces (kernel/nsproxy.c:178) [ 57.642877][ T2828] copy_process (kernel/fork.c:2197) [ 57.647334][ T2828] kernel_clone (kernel/fork.c:2584) [ 57.651614][ T2828] __do_sys_clone (kernel/fork.c:2702) [ 57.655983][ T2828] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) [ 57.660269][ T2828] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113) [ 57.666030][ T2828] RIP: 0033:0x7f0944ed94c1 [ 57.670313][ T2828] Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00 All code ======== 0: 48 85 ff test %rdi,%rdi 3: 74 3d je 0x42 5: 48 85 f6 test %rsi,%rsi 8: 74 38 je 0x42 a: 48 83 ee 10 sub $0x10,%rsi e: 48 89 4e 08 mov %rcx,0x8(%rsi) 12: 48 89 3e mov %rdi,(%rsi) 15: 48 89 d7 mov %rdx,%rdi 18: 4c 89 c2 mov %r8,%rdx 1b: 4d 89 c8 mov %r9,%r8 1e: 4c 8b 54 24 08 mov 0x8(%rsp),%r10 23: b8 38 00 00 00 mov $0x38,%eax 28: 0f 05 syscall 2a:* 48 85 c0 test %rax,%rax <-- trapping instruction 2d: 7c 13 jl 0x42 2f: 74 01 je 0x32 31: c3 retq 32: 31 ed xor %ebp,%ebp 34: 58 pop %rax 35: 5f pop %rdi 36: ff d0 callq *%rax 38: 48 89 c7 mov %rax,%rdi 3b: b8 3c 00 00 00 mov $0x3c,%eax Code starting with the faulting instruction =========================================== 0: 48 85 c0 test %rax,%rax 3: 7c 13 jl 0x18 5: 74 01 je 0x8 7: c3 retq 8: 31 ed xor %ebp,%ebp a: 58 pop %rax b: 5f pop %rdi c: ff d0 callq *%rax e: 48 89 c7 mov %rax,%rdi 11: b8 3c 00 00 00 mov $0x3c,%eax [ 57.689853][ T2828] RSP: 002b:00007fff8c8ae618 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 [ 57.698178][ T2828] RAX: ffffffffffffffda RBX: 00007f0944fa2540 RCX: 00007f0944ed94c1 [ 57.706034][ T2828] RDX: 0000000000000000 RSI: 00007f0944ddd000 RDI: 0000000040000111 [ 57.713884][ T2828] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 57.721731][ T2828] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 [ 57.729579][ T2828] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 57.737429][ T2828] ---[ end trace e666a106f9052963 ]--- [ 57.743625][ T2800] LTP: starting clone302 [ 57.749334][ T2800] LTP: starting connect01 [ 57.754755][ T2800] LTP: starting dup06 [ 57.761002][ T2800] LTP: starting epoll01 (epoll-ltp) [ 59.311000][ T324] result_service: raw_upload, RESULT_MNT: /internal-lkp-server/result, RESULT_ROOT: /internal-lkp-server/result/ltp/1HDD-btrfs-syscalls-05-ucode=0xe2/lkp-skl-d02/debian-10.4-x86_64-20200603.cgz/x86_64-rhel-8.3-func/gcc-9/d7fa06e1aeccabc3a55332ff6c004eb17cc6b0d1/3, TMP_RESULT_ROOT: /tmp/lkp/result [ 59.311004][ T324] [ 59.345615][ T324] run-job /lkp/jobs/scheduled/lkp-skl-d02/ltp-1HDD-btrfs-syscalls-05-ucode=0xe2-debian-10.4-x86_64-20200603.cgz-d7fa06e1aeccabc3a55332ff6c004eb17cc6b0d1-20211103-18496-1habfde-4.yaml [ 59.345618][ T324] [ 59.479207][ T2800] LTP: starting execle01 [ 59.485024][ T2800] LTP: starting execve04 [ 59.492955][ T2800] LTP: starting execveat02 [ 59.504446][ T2800] LTP: starting posix_fadvise01 [ 59.510406][ T2800] LTP: starting fchmod06 [ 59.516112][ T2800] LTP: starting fcntl05_64 [ 59.521526][ T2800] LTP: starting fcntl11_64 [ 59.527286][ T2800] LTP: starting fcntl19_64 [ 59.532875][ T2800] LTP: starting fcntl26_64 [ 59.538041][ T2800] LTP: starting fcntl32_64 [ 59.543358][ T2800] LTP: starting flistxattr02 [ 59.549169][ T2800] LTP: starting flock03 [ 59.555831][ T2800] LTP: starting fork06 [ 59.648342][ T2800] LTP: starting fork07 [ 59.658402][ T2800] LTP: starting fork10 [ 59.663752][ T2800] LTP: starting fork11 [ 59.679721][ T2800] LTP: starting fstatfs01_64 [ 59.685115][ T2800] LTP: starting fsync03 [ 59.690596][ T2800] LTP: starting ftruncate03_64 [ 59.696425][ T2800] LTP: starting futimesat01 [ 59.701877][ T2800] LTP: starting getegid01_16 [ 59.707110][ T2800] LTP: starting getgid01 [ 59.712657][ T2800] LTP: starting getgroups01 [ 59.718109][ T2800] LTP: starting getgroups03_16 [ 59.723683][ T2800] LTP: starting getpagesize01 [ 59.729058][ T2800] LTP: starting getpriority02 [ 59.734865][ T2800] LTP: starting getrlimit03 [ 59.740522][ T2800] LTP: starting getuid03_16 [ 59.745810][ T2800] LTP: starting ioctl_loop02 [ 59.754351][T17929] loop: module loaded [ 59.758806][T17928] loop0: detected capacity change from 0 to 20 [ 59.877323][T17928] loop0: detected capacity change from 0 to 20 [ 59.999803][ T2800] LTP: starting ioctl_ns06 [ 60.005751][ T2800] LTP: starting inotify_init1_02 [ 60.011546][ T2800] LTP: starting inotify08 [ 60.016735][T17936] loop0: detected capacity change from 0 to 524288 [ 60.358357][T17936] ext2 filesystem being mounted at /fs/sda1/tmpdir/ltp-OBpFUcDTgK/inoEFEnxB/mntpoint supports timestamps until 2038 (0x7fffffff) [ 60.440207][ T324] /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 To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests sudo 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 sudo bin/lkp run generated-yaml-file # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang