FYI, we noticed the following commit: commit: 16bae4bd1bed86c7d98a700485bfcbb8ee148afc ("cfg80211: support reloading regulatory database") https://git.kernel.org/cgit/linux/kernel/git/jberg/mac80211-next.git regulatory 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-i386 -enable-kvm -smp 2 -m 320M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +---------------------------------------------------------+------------+------------+ | | f86882f2f7 | 16bae4bd1b | +---------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 196 | 195 | | BUG:-#unexpected_failures(out_of#)-debugging_disabled!| | 196 | 195 | | IP-Config:Auto-configuration_of_network_failed | 193 | 194 | | BUG:kernel_hang_in_test_stage | 1 | | | WARNING:at_net/wireless/reg.c:#regdb_fw_cb | 0 | 20 | | EIP:regdb_fw_cb | 0 | 20 | +---------------------------------------------------------+------------+------------+ [ 2.278472] WARNING: CPU: 0 PID: 29 at net/wireless/reg.c:794 regdb_fw_cb+0x19/0x100 [ 2.282159] CPU: 0 PID: 29 Comm: kworker/0:1 Not tainted 4.13.0-06468-g16bae4b #1 [ 2.284259] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 2.288298] Workqueue: events request_firmware_work_func [ 2.289521] task: 934f9000 task.stack: 93506000 [ 2.291586] EIP: regdb_fw_cb+0x19/0x100 [ 2.294211] EFLAGS: 00210286 CPU: 0 [ 2.295234] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 8caade1f [ 2.296195] ESI: 93646348 EDI: ffffffc3 EBP: 93507ef8 ESP: 93507eec [ 2.297460] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 2.298546] CR0: 80050033 CR2: 00000000 CR3: 0d4a3000 CR4: 000006b0 [ 2.300092] Call Trace: [ 2.300501] request_firmware_work_func+0x27/0x50 [ 2.301606] process_one_work+0x1b5/0x380 [ 2.302459] ? process_one_work+0x15f/0x380 [ 2.303335] worker_thread+0x25e/0x3e0 [ 2.304149] kthread+0x102/0x110 [ 2.305024] ? process_one_work+0x380/0x380 [ 2.305777] ? __kthread_bind_mask+0x60/0x60 [ 2.306423] ret_from_fork+0x19/0x30 [ 2.307056] Code: 3e 8d 74 26 00 e9 d5 fc ff ff 90 8d b4 26 00 00 00 00 55 89 e5 57 56 53 89 d6 89 c3 e8 31 70 f3 ff 8b 3d dc 37 c1 8e 85 ff 74 27 <0f> ff 89 d8 e8 6e 3c 91 ff e8 a9 70 f3 ff 89 f0 e8 b2 55 42 ff [ 2.310053] ---[ end trace d1e629ca37c6b71c ]--- To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Xiaolong