FYI, we noticed the following commit:

commit: c8da9be4a75f1f63024a16b976c5be47405c13dc ("ALSA: pcm: Adjust nine function calls together with a variable assignment") https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git for-next

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 -m 256M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

+------------------------------------------------+------------+------------+ | | 97d15a141f | c8da9be4a7 | +------------------------------------------------+------------+------------+ | boot_successes | 4 | 0 | | boot_failures | 2 | 6 | | IP-Config:Auto-configuration_of_network_failed | 2 | 2 | | WARNING:at_fs/proc/generic.c:#proc_register | 0 | 6 | | EIP:proc_register | 0 | 6 | +------------------------------------------------+------------+------------+

[ 8.559972] WARNING: CPU: 0 PID: 1 at fs/proc/generic.c:328 proc_register+0xe4/0x130 [ 8.559972] WARNING: CPU: 0 PID: 1 at fs/proc/generic.c:328 proc_register+0xe4/0x130 [ 8.561652] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc3-00171-gc8da9be #1 [ 8.561652] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc3-00171-gc8da9be #1 [ 8.562958] task: cf644000 task.stack: cf646000 [ 8.562958] task: cf644000 task.stack: cf646000 [ 8.563748] EIP: proc_register+0xe4/0x130 [ 8.563748] EIP: proc_register+0xe4/0x130 [ 8.564423] EFLAGS: 00210282 CPU: 0 [ 8.564423] EFLAGS: 00210282 CPU: 0 [ 8.565001] EAX: 0000002e EBX: ced3a038 ECX: 00000000 EDX: 00000000 [ 8.565001] EAX: 0000002e EBX: ced3a038 ECX: 00000000 EDX: 00000000 [ 8.566049] ESI: ced3dab0 EDI: cf724d24 EBP: cf647d08 ESP: cf647ce8 [ 8.566049] ESI: ced3dab0 EDI: cf724d24 EBP: cf647d08 ESP: cf647ce8 [ 8.567102] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 8.567102] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 8.568042] CR0: 80050033 CR2: 00000000 CR3: 021d5000 CR4: 000006b0 [ 8.568042] CR0: 80050033 CR2: 00000000 CR3: 021d5000 CR4: 000006b0 [ 8.569131] Call Trace: [ 8.569131] Call Trace: [ 8.569561] proc_create_data+0x81/0xf0 [ 8.569561] proc_create_data+0x81/0xf0 [ 8.570264] snd_info_register+0x6d/0xe0 [ 8.570264] snd_info_register+0x6d/0xe0 [ 8.570941] snd_pcm_new_stream+0x21b/0x4a0 [ 8.570941] snd_pcm_new_stream+0x21b/0x4a0 [ 8.571694] ? strlcpy+0x33/0x50 [ 8.571694] ? strlcpy+0x33/0x50 [ 8.572252] _snd_pcm_new+0xc6/0x150 [ 8.572252] _snd_pcm_new+0xc6/0x150 [ 8.572874] snd_pcm_new+0x18/0x20 [ 8.572874] snd_pcm_new+0x18/0x20 [ 8.573463] snd_dummy_probe+0xec/0x400 [ 8.573463] snd_dummy_probe+0xec/0x400 [ 8.574103] platform_drv_probe+0x1e/0x60 [ 8.574103] platform_drv_probe+0x1e/0x60 [ 8.574785] really_probe+0x1c2/0x260 [ 8.574785] really_probe+0x1c2/0x260 [ 8.575424] __device_attach_driver+0x72/0xb0 [ 8.575424] __device_attach_driver+0x72/0xb0 [ 8.576183] ? __driver_attach+0xb0/0xb0 [ 8.576183] ? __driver_attach+0xb0/0xb0 [ 8.576844] bus_for_each_drv+0x4f/0x80 [ 8.576844] bus_for_each_drv+0x4f/0x80 [ 8.577486] __device_attach+0x9e/0xd0 [ 8.577486] __device_attach+0x9e/0xd0 [ 8.578113] ? __driver_attach+0xb0/0xb0 [ 8.578113] ? __driver_attach+0xb0/0xb0 [ 8.578772] device_initial_probe+0x12/0x20 [ 8.578772] device_initial_probe+0x12/0x20 [ 8.579486] bus_probe_device+0x77/0x80 [ 8.579486] bus_probe_device+0x77/0x80 [ 8.580201] device_add+0x2fc/0x530 [ 8.580201] device_add+0x2fc/0x530 [ 8.580797] ? dev_set_name+0x19/0x20 [ 8.580797] ? dev_set_name+0x19/0x20 [ 8.581416] platform_device_add+0x124/0x240 [ 8.581416] platform_device_add+0x124/0x240 [ 8.582156] platform_device_register_full+0xe2/0x120 [ 8.582156] platform_device_register_full+0xe2/0x120 [ 8.583002] alsa_card_dummy_init+0x97/0xf4 [ 8.583002] alsa_card_dummy_init+0x97/0xf4 [ 8.583784] ? alsa_seq_midi_event_init+0xc/0xc [ 8.583784] ? alsa_seq_midi_event_init+0xc/0xc [ 8.584604] do_one_initcall+0x80/0x151 [ 8.584604] do_one_initcall+0x80/0x151 [ 8.585270] ? parse_args+0x130/0x2a0 [ 8.585270] ? parse_args+0x130/0x2a0 [ 8.585890] ? kernel_init_freeable+0xe5/0x178 [ 8.585890] ? kernel_init_freeable+0xe5/0x178 [ 8.586630] kernel_init_freeable+0x105/0x178 [ 8.586630] kernel_init_freeable+0x105/0x178 [ 8.587655] ? rest_init+0xf0/0xf0 [ 8.587655] ? rest_init+0xf0/0xf0 [ 8.588230] kernel_init+0xd/0xf0 [ 8.588230] kernel_init+0xd/0xf0 [ 8.588778] ret_from_fork+0x19/0x24 [ 8.588778] ret_from_fork+0x19/0x24 [ 8.589384] Code: af 8d b6 00 00 00 00 6a 01 31 c9 ba 01 00 00 00 b8 90 4e f7 c1 83 c7 7c e8 ba 5a ef ff ff 75 f0 57 68 ac f0 d4 c1 e8 6c 2f e9 ff <0f> ff 6a 01 31 c9 ba 01 00 00 00 b8 78 4e f7 c1 e8 97 5a ef ff [ 8.589384] Code: af 8d b6 00 00 00 00 6a 01 31 c9 ba 01 00 00 00 b8 90 4e f7 c1 83 c7 7c e8 ba 5a ef ff ff 75 f0 57 68 ac f0 d4 c1 e8 6c 2f e9 ff <0f> ff 6a 01 31 c9 ba 01 00 00 00 b8 78 4e f7 c1 e8 97 5a ef ff [ 8.592689] ---[ end trace 8498fc54cd971cf8 ]---

To reproduce:

git clone https://github.com/01org/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email

Thanks, Xiaolong