为什么当我的 linux 驱动程序第二次失败而第一次 insmod 运行正常时它转储堆栈两次
几天前我开始学习linux驱动程序，我写了一个简单的驱动程序。首先我insmod了我的驱动程序，它显示它运行良好，并且当我rmmod时正常。但是当我再次insmod它时，控制台日志显示“killed”，然后我使用dmesg。内核日志显示了两次 stackdump，这让我很惊讶，所以我不知道如何调试（使用 printk (●'◡'●)）。 在搜索机上尝试了很多次，但一无所获。所以我把它扔在这里，非常非常迫切地需要你们的帮助。我真的想知道为什么它第二次失败，为什么 stackdump 发生两次以及我该如何修复这个驱动程序。非常非常感谢！ 我的虚拟机Linux内核版本是：5.13.0 驱动程序代码在这里：
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/fs.h>
#include <linux/kdev_t.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/kobject.h>
static ssize_t my_file_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return snprintf(buf, 64, "%s", __func__);
}
static ssize_t my_file_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
pr_info("going to my_file_store\n");
return count;
}
static DEVICE_ATTR(my_file, 0664, my_file_show, my_file_store);
static int my_devid = -1;
static struct class *my_class = NULL;
static struct device *my_device = NULL;
static int __init my_init(void){
pr_info("going to %s\n", __func__);
int ret = 0;
ret = alloc_chrdev_region(&my_devid, 0, 1, "my_devid");
if(ret < 0){
my_devid = -1;
pr_err("[%s,%d]alloc_chrdev_region failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("my devid %d\n", my_devid);
my_class = class_create(THIS_MODULE, "my_class");
if(my_class == NULL){
pr_err("[%s,%d]class_create failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("[%s,%d]goes here\n", __func__, __LINE__);
my_device = device_create(my_class, NULL, my_devid, "%s", "my_dev");
if(my_device == NULL){
pr_err("[%s,%d] device_create failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("[%s,%d]goes here\n", __func__, __LINE__);
ret = device_create_file(my_device, &dev_attr_my_file);
if(ret < 0){
pr_err("sysfs_create_file failed\n");
goto FAULT;
}
pr_info("go to init tail now\n");
return 0;
FAULT:
if(my_devid != -1){
unregister_chrdev_region(my_devid, "my_devid");
my_devid = -1;
}
if(my_device != NULL){
device_destroy(my_class, my_devid);
my_device = NULL;
}
if(my_class != NULL){
class_destroy(my_class);
my_class = NULL;
}
return 0;
}
static void __exit my_exit(void){
pr_info("going to %s\n", __func__);
device_remove_file(my_device, &dev_attr_my_file);
if(my_devid != -1){
unregister_chrdev_region(my_devid, "my_devid");
my_devid = -1;
}
if(my_device != NULL){
device_destroy(my_class, my_devid);
my_device = NULL;
}
if(my_class != NULL){
class_destroy(my_class);
my_class = NULL;
}
}
module_init(my_init);
module_exit(my_exit);
MODULE_AUTHOR("tid");
MODULE_LICENSE("GPL");
这是 dmesg：
going to my_init
[87682.699433] my devid 247463936
[87682.700041] [my_init,47]goes here
[87682.706933] [my_init,54]goes here
[87682.706937] go to init tail now
[87704.903499] going to my_exit
[87747.424115] going to my_init
[87747.424385] my devid 262144000
[87747.424418] [my_init,47]goes here
[87747.424784] sysfs: cannot create duplicate filename '/devices/virtual/my_class'
[87747.424989] CPU: 1 PID: 462167 Comm: insmod Tainted: G OE 5.13.0-27-generic #29~20.04.1-Ubuntu
[87747.424992] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
[87747.425172] Call Trace:
[87747.426055] dump_stack+0x7d/0x9c
[87747.427617] sysfs_warn_dup.cold+0x17/0x27
[87747.427889] sysfs_create_dir_ns+0xb8/0xd0
[87747.428703] kobject_add_internal+0xbd/0x2b0
[87747.429021] kobject_add+0x7e/0xb0
[87747.429023] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.429671] get_device_parent.isra.0+0x179/0x1b0
[87747.429943] device_add+0xe3/0x8e0
[87747.429945] device_create_groups_vargs+0xd4/0xf0
[87747.429946] ? 0xffffffffc09b1000
[87747.429948] device_create+0x49/0x60
[87747.429950] my_init+0xf0/0x1000 [test]
[87747.430241] do_one_initcall+0x46/0x1d0
[87747.430632] ? __cond_resched+0x19/0x30
[87747.430866] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.430869] do_init_module+0x62/0x260
[87747.430898] load_module+0x125d/0x1440
[87747.431183] __do_sys_finit_module+0xc2/0x120
[87747.431185] ? __do_sys_finit_module+0xc2/0x120
[87747.431186] __x64_sys_finit_module+0x1a/0x20
[87747.431188] do_syscall_64+0x61/0xb0
[87747.431260] ? __x64_sys_newfstat+0x16/0x20
[87747.431361] ? do_syscall_64+0x6e/0xb0
[87747.431363] ? __x64_sys_lseek+0x1a/0x20
[87747.431380] ? do_syscall_64+0x6e/0xb0
[87747.431382] ? exc_page_fault+0x8f/0x170
[87747.431383] ? asm_exc_page_fault+0x8/0x30
[87747.431385] entry_SYSCALL_64_after_hwframe+0x44/0xae
[87747.431386] RIP: 0033:0x7fd6b8d3789d
[87747.431388] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 f5 0c 00 f7 d8 64 89 01 48
[87747.431390] RSP: 002b:00007ffe09073bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[87747.431405] RAX: ffffffffffffffda RBX: 0000557d4fa68760 RCX: 00007fd6b8d3789d
[87747.431405] RDX: 0000000000000000 RSI: 0000557d4db48358 RDI: 0000000000000003
[87747.431406] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd6b8e0b260
[87747.431407] R10: 0000000000000003 R11: 0000000000000246 R12: 0000557d4db48358
[87747.431407] R13: 0000000000000000 R14: 0000557d4fa683d0 R15: 0000000000000000
[87747.431503] kobject_add_internal failed for my_class with -EEXIST, don't try to register things with the same name in the same directory.
[87747.431713] [my_init,54]goes here
[87747.431749] BUG: kernel NULL pointer dereference, address: 000000000000001f
[87747.431765] #PF: supervisor read access in kernel mode
[87747.431780] #PF: error_code(0x0000) - not-present page
[87747.431819] PGD 0 P4D 0
[87747.431821] Oops: 0000 [#1] SMP NOPTI
[87747.431823] CPU: 1 PID: 462167 Comm: insmod Tainted: G OE 5.13.0-27-generic #29~20.04.1-Ubuntu
[87747.431825] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
[87747.431826] RIP: 0010:sysfs_create_file_ns+0x26/0x90
[87747.431829] Code: 9c 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 45 e0 31 c0 48 85 ff 74 5b <48> 83 7f 30 00 48 89 fb 74 51 49 89 f4 48 85 f6 74 49 49 89 d5 48
[87747.431831] RSP: 0018:ffffa39a0406fbe0 EFLAGS: 00010282
[87747.431832] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027
[87747.431833] RDX: 0000000000000000 RSI: ffffffffc09ae020 RDI: ffffffffffffffef
[87747.431834] RBP: ffffa39a0406fc08 R08: ffff8e77b9e589c0 R09: ffffa39a0406fa18
[87747.431835] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffffc09ae020
[87747.431836] R13: ffffffffffffffef R14: ffffffffc09ae040 R15: 0000000000000000
[87747.431837] FS: 00007fd6b8bf2540(0000) GS:ffff8e77b9e40000(0000) knlGS:0000000000000000
[87747.431838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[87747.432290] CR2: 000000000000001f CR3: 000000001f4c8005 CR4: 00000000003706e0
[87747.432721] Call Trace:
[87747.432724] device_create_file+0x42/0x80
[87747.432726] ? 0xffffffffc09b1000
[87747.432728] my_init+0x141/0x1000 [test]
[87747.432730] do_one_initcall+0x46/0x1d0
[87747.432732] ? __cond_resched+0x19/0x30
[87747.432734] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.432737] do_init_module+0x62/0x260
[87747.432739] load_module+0x125d/0x1440
[87747.432741] __do_sys_finit_module+0xc2/0x120
[87747.432742] ? __do_sys_finit_module+0xc2/0x120
[87747.432743] __x64_sys_finit_module+0x1a/0x20
[87747.432745] do_syscall_64+0x61/0xb0
[87747.432747] ? __x64_sys_newfstat+0x16/0x20
[87747.432749] ? do_syscall_64+0x6e/0xb0
[87747.432750] ? __x64_sys_lseek+0x1a/0x20
[87747.432752] ? do_syscall_64+0x6e/0xb0
[87747.432754] ? exc_page_fault+0x8f/0x170
[87747.432755] ? asm_exc_page_fault+0x8/0x30
[87747.432756] entry_SYSCALL_64_after_hwframe+0x44/0xae
[87747.432758] RIP: 0033:0x7fd6b8d3789d
[87747.432759] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 f5 0c 00 f7 d8 64 89 01 48
[87747.432760] RSP: 002b:00007ffe09073bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[87747.432762] RAX: ffffffffffffffda RBX: 0000557d4fa68760 RCX: 00007fd6b8d3789d
[87747.433030] RDX: 0000000000000000 RSI: 0000557d4db48358 RDI: 0000000000000003
[87747.433032] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd6b8e0b260
[87747.433033] R10: 0000000000000003 R11: 0000000000000246 R12: 0000557d4db48358
[87747.433033] R13: 0000000000000000 R14: 0000557d4fa683d0 R15: 0000000000000000
[87747.433036] Modules linked in: test(OE+) vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock nls_iso8859_1 intel_rapl_msr intel_rapl_common crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd rapl vmw_balloon snd_ens1371 snd_ac97_codec gameport ac97_bus snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi joydev input_leds serio_raw snd_seq snd_seq_device snd_timer snd soundcore vmw_vmci mac_hid sch_fq_codel vmwgfx ttm drm_kms_helper cec rc_core fb_sys_fops syscopyarea sysfillrect sysimgblt msr nfsd parport_pc auth_rpcgss ppdev nfs_acl lockd lp grace parport drm sunrpc ip_tables x_tables autofs4 hid_generic ahci e1000 libahci usbhid hid mptspi mptscsih mptbase crc32_pclmul psmouse scsi_transport_spi i2c_piix4 pata_acpi [last unloaded: test]
[87747.433869] CR2: 000000000000001f
[87747.434327] ---[ end trace d7785aaa07b44309 ]---
[87747.434352] RIP: 0010:sysfs_create_file_ns+0x26/0x90
[87747.434357] Code: 9c 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 45 e0 31 c0 48 85 ff 74 5b <48> 83 7f 30 00 48 89 fb 74 51 49 89 f4 48 85 f6 74 49 49 89 d5 48
[87747.434359] RSP: 0018:ffffa39a0406fbe0 EFLAGS: 00010282
[87747.434361] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027
[87747.434362] RDX: 0000000000000000 RSI: ffffffffc09ae020 RDI: ffffffffffffffef
[87747.434363] RBP: ffffa39a0406fc08 R08: ffff8e77b9e589c0 R09: ffffa39a0406fa18
[87747.434363] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffffc09ae020
[87747.434364] R13: ffffffffffffffef R14: ffffffffc09ae040 R15: 0000000000000000
[87747.434365] FS: 00007fd6b8bf2540(0000) GS:ffff8e77b9e40000(0000) knlGS:0000000000000000
[87747.434366] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[87747.434368] CR2: 000000000000001f CR3: 000000001f4c8005 CR4: 00000000003706e0
i started learning linux driver a few days ago and i write a simple driver.fisrt i insmod my driver ,it showed it runs well ,and normal when i rmmod. but when i insmod it again, console log showed "killed", and then i use dmesg. The kernel log showed twice stackdump which surprised me so that i don't how to debug(use printk (●'◡'●)).
Many times tried on search machine, i got nothing. so i throwed it here, needing your guys help very very desperate. i truely wanna know why it failed at second time, why stackdump happened twice and how could i fix this driver. thanks very very much!
my vm linux kernel version is : 5.13.0
driver code is here:
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/fs.h>
#include <linux/kdev_t.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/kobject.h>
static ssize_t my_file_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return snprintf(buf, 64, "%s", __func__);
}
static ssize_t my_file_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
pr_info("going to my_file_store\n");
return count;
}
static DEVICE_ATTR(my_file, 0664, my_file_show, my_file_store);
static int my_devid = -1;
static struct class *my_class = NULL;
static struct device *my_device = NULL;
static int __init my_init(void){
pr_info("going to %s\n", __func__);
int ret = 0;
ret = alloc_chrdev_region(&my_devid, 0, 1, "my_devid");
if(ret < 0){
my_devid = -1;
pr_err("[%s,%d]alloc_chrdev_region failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("my devid %d\n", my_devid);
my_class = class_create(THIS_MODULE, "my_class");
if(my_class == NULL){
pr_err("[%s,%d]class_create failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("[%s,%d]goes here\n", __func__, __LINE__);
my_device = device_create(my_class, NULL, my_devid, "%s", "my_dev");
if(my_device == NULL){
pr_err("[%s,%d] device_create failed\n", __func__, __LINE__);
goto FAULT;
}
pr_info("[%s,%d]goes here\n", __func__, __LINE__);
ret = device_create_file(my_device, &dev_attr_my_file);
if(ret < 0){
pr_err("sysfs_create_file failed\n");
goto FAULT;
}
pr_info("go to init tail now\n");
return 0;
FAULT:
if(my_devid != -1){
unregister_chrdev_region(my_devid, "my_devid");
my_devid = -1;
}
if(my_device != NULL){
device_destroy(my_class, my_devid);
my_device = NULL;
}
if(my_class != NULL){
class_destroy(my_class);
my_class = NULL;
}
return 0;
}
static void __exit my_exit(void){
pr_info("going to %s\n", __func__);
device_remove_file(my_device, &dev_attr_my_file);
if(my_devid != -1){
unregister_chrdev_region(my_devid, "my_devid");
my_devid = -1;
}
if(my_device != NULL){
device_destroy(my_class, my_devid);
my_device = NULL;
}
if(my_class != NULL){
class_destroy(my_class);
my_class = NULL;
}
}
module_init(my_init);
module_exit(my_exit);
MODULE_AUTHOR("tid");
MODULE_LICENSE("GPL");
this is dmesg:
going to my_init
[87682.699433] my devid 247463936
[87682.700041] [my_init,47]goes here
[87682.706933] [my_init,54]goes here
[87682.706937] go to init tail now
[87704.903499] going to my_exit
[87747.424115] going to my_init
[87747.424385] my devid 262144000
[87747.424418] [my_init,47]goes here
[87747.424784] sysfs: cannot create duplicate filename '/devices/virtual/my_class'
[87747.424989] CPU: 1 PID: 462167 Comm: insmod Tainted: G OE 5.13.0-27-generic #29~20.04.1-Ubuntu
[87747.424992] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
[87747.425172] Call Trace:
[87747.426055] dump_stack+0x7d/0x9c
[87747.427617] sysfs_warn_dup.cold+0x17/0x27
[87747.427889] sysfs_create_dir_ns+0xb8/0xd0
[87747.428703] kobject_add_internal+0xbd/0x2b0
[87747.429021] kobject_add+0x7e/0xb0
[87747.429023] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.429671] get_device_parent.isra.0+0x179/0x1b0
[87747.429943] device_add+0xe3/0x8e0
[87747.429945] device_create_groups_vargs+0xd4/0xf0
[87747.429946] ? 0xffffffffc09b1000
[87747.429948] device_create+0x49/0x60
[87747.429950] my_init+0xf0/0x1000 [test]
[87747.430241] do_one_initcall+0x46/0x1d0
[87747.430632] ? __cond_resched+0x19/0x30
[87747.430866] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.430869] do_init_module+0x62/0x260
[87747.430898] load_module+0x125d/0x1440
[87747.431183] __do_sys_finit_module+0xc2/0x120
[87747.431185] ? __do_sys_finit_module+0xc2/0x120
[87747.431186] __x64_sys_finit_module+0x1a/0x20
[87747.431188] do_syscall_64+0x61/0xb0
[87747.431260] ? __x64_sys_newfstat+0x16/0x20
[87747.431361] ? do_syscall_64+0x6e/0xb0
[87747.431363] ? __x64_sys_lseek+0x1a/0x20
[87747.431380] ? do_syscall_64+0x6e/0xb0
[87747.431382] ? exc_page_fault+0x8f/0x170
[87747.431383] ? asm_exc_page_fault+0x8/0x30
[87747.431385] entry_SYSCALL_64_after_hwframe+0x44/0xae
[87747.431386] RIP: 0033:0x7fd6b8d3789d
[87747.431388] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 f5 0c 00 f7 d8 64 89 01 48
[87747.431390] RSP: 002b:00007ffe09073bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[87747.431405] RAX: ffffffffffffffda RBX: 0000557d4fa68760 RCX: 00007fd6b8d3789d
[87747.431405] RDX: 0000000000000000 RSI: 0000557d4db48358 RDI: 0000000000000003
[87747.431406] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd6b8e0b260
[87747.431407] R10: 0000000000000003 R11: 0000000000000246 R12: 0000557d4db48358
[87747.431407] R13: 0000000000000000 R14: 0000557d4fa683d0 R15: 0000000000000000
[87747.431503] kobject_add_internal failed for my_class with -EEXIST, don't try to register things with the same name in the same directory.
[87747.431713] [my_init,54]goes here
[87747.431749] BUG: kernel NULL pointer dereference, address: 000000000000001f
[87747.431765] #PF: supervisor read access in kernel mode
[87747.431780] #PF: error_code(0x0000) - not-present page
[87747.431819] PGD 0 P4D 0
[87747.431821] Oops: 0000 [#1] SMP NOPTI
[87747.431823] CPU: 1 PID: 462167 Comm: insmod Tainted: G OE 5.13.0-27-generic #29~20.04.1-Ubuntu
[87747.431825] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
[87747.431826] RIP: 0010:sysfs_create_file_ns+0x26/0x90
[87747.431829] Code: 9c 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 45 e0 31 c0 48 85 ff 74 5b <48> 83 7f 30 00 48 89 fb 74 51 49 89 f4 48 85 f6 74 49 49 89 d5 48
[87747.431831] RSP: 0018:ffffa39a0406fbe0 EFLAGS: 00010282
[87747.431832] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027
[87747.431833] RDX: 0000000000000000 RSI: ffffffffc09ae020 RDI: ffffffffffffffef
[87747.431834] RBP: ffffa39a0406fc08 R08: ffff8e77b9e589c0 R09: ffffa39a0406fa18
[87747.431835] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffffc09ae020
[87747.431836] R13: ffffffffffffffef R14: ffffffffc09ae040 R15: 0000000000000000
[87747.431837] FS: 00007fd6b8bf2540(0000) GS:ffff8e77b9e40000(0000) knlGS:0000000000000000
[87747.431838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[87747.432290] CR2: 000000000000001f CR3: 000000001f4c8005 CR4: 00000000003706e0
[87747.432721] Call Trace:
[87747.432724] device_create_file+0x42/0x80
[87747.432726] ? 0xffffffffc09b1000
[87747.432728] my_init+0x141/0x1000 [test]
[87747.432730] do_one_initcall+0x46/0x1d0
[87747.432732] ? __cond_resched+0x19/0x30
[87747.432734] ? kmem_cache_alloc_trace+0x37c/0x440
[87747.432737] do_init_module+0x62/0x260
[87747.432739] load_module+0x125d/0x1440
[87747.432741] __do_sys_finit_module+0xc2/0x120
[87747.432742] ? __do_sys_finit_module+0xc2/0x120
[87747.432743] __x64_sys_finit_module+0x1a/0x20
[87747.432745] do_syscall_64+0x61/0xb0
[87747.432747] ? __x64_sys_newfstat+0x16/0x20
[87747.432749] ? do_syscall_64+0x6e/0xb0
[87747.432750] ? __x64_sys_lseek+0x1a/0x20
[87747.432752] ? do_syscall_64+0x6e/0xb0
[87747.432754] ? exc_page_fault+0x8f/0x170
[87747.432755] ? asm_exc_page_fault+0x8/0x30
[87747.432756] entry_SYSCALL_64_after_hwframe+0x44/0xae
[87747.432758] RIP: 0033:0x7fd6b8d3789d
[87747.432759] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 f5 0c 00 f7 d8 64 89 01 48
[87747.432760] RSP: 002b:00007ffe09073bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[87747.432762] RAX: ffffffffffffffda RBX: 0000557d4fa68760 RCX: 00007fd6b8d3789d
[87747.433030] RDX: 0000000000000000 RSI: 0000557d4db48358 RDI: 0000000000000003
[87747.433032] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd6b8e0b260
[87747.433033] R10: 0000000000000003 R11: 0000000000000246 R12: 0000557d4db48358
[87747.433033] R13: 0000000000000000 R14: 0000557d4fa683d0 R15: 0000000000000000
[87747.433036] Modules linked in: test(OE+) vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock nls_iso8859_1 intel_rapl_msr intel_rapl_common crct10dif_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd rapl vmw_balloon snd_ens1371 snd_ac97_codec gameport ac97_bus snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi joydev input_leds serio_raw snd_seq snd_seq_device snd_timer snd soundcore vmw_vmci mac_hid sch_fq_codel vmwgfx ttm drm_kms_helper cec rc_core fb_sys_fops syscopyarea sysfillrect sysimgblt msr nfsd parport_pc auth_rpcgss ppdev nfs_acl lockd lp grace parport drm sunrpc ip_tables x_tables autofs4 hid_generic ahci e1000 libahci usbhid hid mptspi mptscsih mptbase crc32_pclmul psmouse scsi_transport_spi i2c_piix4 pata_acpi [last unloaded: test]
[87747.433869] CR2: 000000000000001f
[87747.434327] ---[ end trace d7785aaa07b44309 ]---
[87747.434352] RIP: 0010:sysfs_create_file_ns+0x26/0x90
[87747.434357] Code: 9c 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 45 e0 31 c0 48 85 ff 74 5b <48> 83 7f 30 00 48 89 fb 74 51 49 89 f4 48 85 f6 74 49 49 89 d5 48
[87747.434359] RSP: 0018:ffffa39a0406fbe0 EFLAGS: 00010282
[87747.434361] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027
[87747.434362] RDX: 0000000000000000 RSI: ffffffffc09ae020 RDI: ffffffffffffffef
[87747.434363] RBP: ffffa39a0406fc08 R08: ffff8e77b9e589c0 R09: ffffa39a0406fa18
[87747.434363] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffffc09ae020
[87747.434364] R13: ffffffffffffffef R14: ffffffffc09ae040 R15: 0000000000000000
[87747.434365] FS: 00007fd6b8bf2540(0000) GS:ffff8e77b9e40000(0000) knlGS:0000000000000000
[87747.434366] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[87747.434368] CR2: 000000000000001f CR3: 000000001f4c8005 CR4: 00000000003706e0
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