Greeting, FYI, we noticed WARNING:at_kernel/kthread.c:#kthread_should_stop due to commit (built with gcc-11): commit: cea83a6b31856293ceab2c6ebab7843322fe105e ("[PATCH v3] hw_random: use add_hwgenerator_randomness() for early entropy") url: https://github.com/intel-lab-lkp/linux/commits/UPDATE-20221106-230344/Jason-A-Donenfeld/hw_random-use-add_hwgenerator_randomness-for-early-entropy/20221106-044656 base: https://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git 30a0b95b1335e12efef89dd78518ed3e4a71a763 patch subject: [PATCH v3] hw_random: use add_hwgenerator_randomness() for early entropy in testcase: stress-ng version: stress-ng-x86_64-0.11-06_20221109 with following parameters: nr_threads: 100% testtime: 60s class: cpu test: str cpufreq_governor: performance on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz (Cascade Lake) with 512G 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 | Link: https://lore.kernel.org/oe-lkp/202211132159.cd70b1c0-oliver.sang@intel.com [ 23.856915][ T1] ------------[ cut here ]------------ [ 23.862386][ T1] WARNING: CPU: 48 PID: 1 at kernel/kthread.c:75 kthread_should_stop (kernel/kthread.c:75 kernel/kthread.c:157) [ 23.871363][ T1] Modules linked in: [ 23.875261][ T1] CPU: 48 PID: 1 Comm: swapper/0 Not tainted 6.1.0-rc3-00001-gcea83a6b3185 #1 [ 23.884138][ T1] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [ 23.895447][ T1] RIP: 0010:kthread_should_stop (kernel/kthread.c:75 kernel/kthread.c:157) [ 23.901164][ T1] Code: 00 0f 1f 44 00 00 65 48 8b 04 25 00 ad 01 00 f6 40 2e 20 74 15 48 8b 80 08 0a 00 00 48 8b 00 48 d1 e8 83 e0 01 c3 cc cc cc cc <0f> 0b eb e7 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 84 00 00 00 00 All code ======== 0: 00 0f add %cl,(%rdi) 2: 1f (bad) 3: 44 00 00 add %r8b,(%rax) 6: 65 48 8b 04 25 00 ad mov %gs:0x1ad00,%rax d: 01 00 f: f6 40 2e 20 testb $0x20,0x2e(%rax) 13: 74 15 je 0x2a 15: 48 8b 80 08 0a 00 00 mov 0xa08(%rax),%rax 1c: 48 8b 00 mov (%rax),%rax 1f: 48 d1 e8 shr %rax 22: 83 e0 01 and $0x1,%eax 25: c3 retq 26: cc int3 27: cc int3 28: cc int3 29: cc int3 2a:* 0f 0b ud2 <-- trapping instruction 2c: eb e7 jmp 0x15 2e: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 35: 00 00 00 00 39: 0f .byte 0xf 3a: 1f (bad) 3b: 84 00 test %al,(%rax) 3d: 00 00 add %al,(%rax) ... Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: eb e7 jmp 0xffffffffffffffeb 4: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) b: 00 00 00 00 f: 0f .byte 0xf 10: 1f (bad) 11: 84 00 test %al,(%rax) 13: 00 00 add %al,(%rax) ... [ 23.920849][ T1] RSP: 0000:ffffc90000073b20 EFLAGS: 00010246 [ 23.926910][ T1] RAX: ffff888100df0000 RBX: 0000000000000000 RCX: 0000000000000000 [ 23.934914][ T1] RDX: 000000000000000e RSI: 0000000000000296 RDI: ffffffff830d57b8 [ 23.942914][ T1] RBP: 0000000000000296 R08: 00000000c7b95e77 R09: 00000000294e6f92 [ 23.950912][ T1] R10: 000000000defdd81 R11: 00000000f09cfad9 R12: ffff88c0882c1700 [ 23.958911][ T1] R13: 0000000000000020 R14: 0000000000000000 R15: 00000000001b15d1 [ 23.966910][ T1] FS: 0000000000000000(0000) GS:ffff88bf7fc00000(0000) knlGS:0000000000000000 [ 23.975872][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.982459][ T1] CR2: 0000000000000000 CR3: 000000807ee0a001 CR4: 00000000007706e0 [ 23.990463][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.998463][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.006470][ T1] PKRU: 55555554 [ 24.010006][ T1] Call Trace: [ 24.013282][ T1] [ 24.016220][ T1] add_hwgenerator_randomness (drivers/char/random.c:885) [ 24.021853][ T1] hwrng_register (drivers/char/hw_random/core.c:590) [ 24.026528][ T1] tpm_chip_register (drivers/char/tpm/tpm-chip.c:254) [ 24.031981][ T1] tpm_tis_core_init.cold (drivers/char/tpm/tpm_tis_core.c:1107) [ 24.037355][ T1] tpm_tis_plat_probe (drivers/char/tpm/tpm_tis.c:324) [ 24.042294][ T1] platform_probe (drivers/base/platform.c:1400) [ 24.046797][ T1] really_probe (drivers/base/dd.c:560 drivers/base/dd.c:639) [ 24.051207][ T1] ? pm_runtime_barrier (arch/x86/include/asm/paravirt.h:596 arch/x86/include/asm/qspinlock.h:57 include/linux/spinlock.h:203 include/linux/spinlock_api_smp.h:158 include/linux/spinlock.h:400 drivers/base/power/runtime.c:1413) [ 24.056227][ T1] __driver_probe_device (drivers/base/dd.c:719 drivers/base/dd.c:776) [ 24.061416][ T1] driver_probe_device (drivers/base/dd.c:808) [ 24.066347][ T1] __driver_attach (drivers/base/dd.c:1191) [ 24.071020][ T1] ? __device_attach_driver (drivers/base/dd.c:1135) [ 24.076558][ T1] ? __device_attach_driver (drivers/base/dd.c:1135) [ 24.082097][ T1] bus_for_each_dev (drivers/base/bus.c:301) [ 24.086774][ T1] bus_add_driver (drivers/base/bus.c:618) [ 24.091443][ T1] driver_register (drivers/base/driver.c:246) [ 24.096116][ T1] ? tpm_init (drivers/char/tpm/tpm_tis.c:379) [ 24.100263][ T1] init_tis (drivers/char/tpm/tpm_tis.c:386) [ 24.104250][ T1] ? tpm_init (drivers/char/tpm/tpm_tis.c:379) [ 24.108399][ T1] ? ktime_get (kernel/time/timekeeping.c:195 (discriminator 3) kernel/time/timekeeping.c:289 (discriminator 3) kernel/time/timekeeping.c:388 (discriminator 3) kernel/time/timekeeping.c:848 (discriminator 3)) [ 24.112637][ T1] ? tpm_init (drivers/char/tpm/tpm_tis.c:379) [ 24.116789][ T1] do_one_initcall (init/main.c:1303) [ 24.121461][ T1] do_initcalls (init/main.c:1375 init/main.c:1392) [ 24.125784][ T1] kernel_init_freeable (init/main.c:1635) [ 24.130978][ T1] ? rest_init (init/main.c:1511) [ 24.135386][ T1] kernel_init (init/main.c:1521) [ 24.139711][ T1] ret_from_fork (arch/x86/entry/entry_64.S:306) [ 24.144122][ T1] [ 24.147143][ T1] ---[ end trace 0000000000000000 ]--- 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. -- 0-DAY CI Kernel Test Service https://01.org/lkp