Networking 使用网络子系统时内核页面分配失败

我正在开发一个使用psnap模块交换数据的驱动程序。但是我得到了下面的崩溃。我如何解决这场车祸？我如何找出问题的原因？我的内核版本是4.9.41

 125.911986] , *pmd=00000000[  125.914637] Internal error: Oops: 206 [#4] PREEMPT SMP ARM
[  125.920145] Modules linked in: sample_gadget(O) libcomposite(O) psnap(O) 
llc(O) bc_example(O) sha512_generic sha512_arm sha256_generic sha1_generic sha1)
[  126.000132] CPU: 1 PID: 500 Comm: systemd-logind Tainted: G      D    O    4.9.41-ge3a80a1c5c #1
[  126.008949] Hardware name: Generic DRA74X (Flattened Device Tree)
[  126.015064] task: ed210000 task.stack: ed31c000
[  126.019621] PC is at __kmalloc_track_caller+0xa8/0x1d8
[  126.019671] Unable to handle kernel paging request at virtual address 01092a85
[  126.019675] pgd = d57867c0
[  126.019681] [01092a85] *pgd=95795003, *pmd=00000000
[  126.039624] LR is at get_mem_cgroup_from_mm+0xd4/0x12c
[  126.044781] pc : [<c03209fc>]    lr : [<c0323414>]    psr: 200f0013
[  126.044781] sp : ed31dc78  ip : ed31dc30  fp : ed31dc9c
[  126.056303] r10: 00000000  r9 : 00001d1e  r8 : ed31dc78
[  126.061547] r7 : ed31c000  r6 : 01092a85  r5 : 025106c0  r4 : ee801c00
[  126.068098] r3 : 00000000  r2 : 2deda000  r1 : 00001d1e  r0 : ee801c00
[  126.074650] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  126.081812] Control: 30c5387d  Table: ad24bd80  DAC: 55555555
[  126.087578] Process systemd-logind (pid: 500, stack limit = 0xed31c210)

[  126.336637] Backtrace: 
[  126.339103] [<c0320954>] (__kmalloc_track_caller) from [<c079e308>] (__kmalloc_reserve.constprop.15+0x2c/0x78)
[  126.349144]  r9:0000000a r8:00000100 r7:c079fd74 r6:025004c0 r5:025004c0 r4:ed31dccf
[  126.356920] [<c079e2dc>] (__kmalloc_reserve.constprop.15) from [<c079fd74>] (__alloc_skb+0x60/0x144)
[  126.366088]  r9:0000000a r8:00000000 r7:ee801cc0 r6:025004c0 r5:0000000a r4:ca4da240
[  126.373864] [<c079fd14>] (__alloc_skb) from [<c079fea8>] (alloc_skb_with_frags+0x50/0x1d4)
[  126.382160]  r9:0000000a r8:00000003 r7:c026e1f8 r6:00000000 r5:7fffffff r4:ee01de40
[  126.389935] [<c079fe58>] (alloc_skb_with_frags) from [<c07968b8>] (sock_alloc_send_pskb+0x1f0/0x20c)
[  126.399104]  r10:00000000 r9:0000000a r8:ee01df84 r7:c026e1f8 r6:ed31c000 r5:7fffffff
[  126.406960]  r4:ee01de40
[  126.409505] [<c07966c8>] (sock_alloc_send_pskb) from [<c084d8b8>] (unix_dgram_sendmsg+0x138/0x648)
[  126.418500]  r10:00000016 r9:00000000 r8:0000000a r7:dff2b500 r6:ee01de40 r5:ed31df48
[  126.426356]  r4:00000000
[  126.428901] [<c084d780>] (unix_dgram_sendmsg) from [<c07942ac>] (sock_sendmsg+0x1c/0x2c)
[  126.437023]  r10:00004000 r9:00000000 r8:ed31de28 r7:dff2b500 r6:00000000 r5:00000000
[  126.444880]  r4:ed31df48
[  126.447423] [<c0794290>] (sock_sendmsg) from [<c0794808>] (___sys_sendmsg+0x1d8/0x1e8)
[  126.455371] [<c0794630>] (___sys_sendmsg) from [<c079553c>] (__sys_sendmsg+0x48/0x74)
[  126.463231]  r10:00000000 r9:ed31c000 r8:c0207d84 r7:00000128 r6:dff2b500 r5:00004000
[  126.471089]  r4:be80da10
[  126.473630] [<c07954f4>] (__sys_sendmsg) from [<c0795578>] (SyS_sendmsg+0x10/0x14)
[  126.481227]  r6:00000010 r5:be80dfa3 r4:be80da10
[  126.485864] [<c0795568>] (SyS_sendmsg) from [<c0207be0>] (ret_fast_syscall+0x0/0x34)

125.911986]，*pmd=00000000[125.914637]内部错误：Oops:206[#4]抢占SMP ARM
[125.920145]链接到的模块：示例_gadget（O）libcomposite（O）psnap（O）
llc（O）bc_示例（O）sha512_通用sha512_手臂sha256_通用sha1_通用sha1）
[126.000132]CPU:1 PID:500通信：系统登录受污染：G D O 4.9.41-ge3a80a1c5c#1
[126.008949]硬件名称：通用DRA74X（扁平设备树）
[126.015064]任务：ed210000任务。堆栈：ed31c000
[126.019621]PC位于呼叫方+0xa8/0x1d8的“kmalloc”轨道
[126.019671]无法处理虚拟地址01092a85处的内核分页请求
[126.019675]pgd=d57867c0
[126.019681][01092a85]*pgd=95795003，*pmd=00000000
[126.039624]LR位于从\u mm+0xd4/0x12c获取\u mem\u cgroup\u的位置
[126.044781]pc:[]lr:[]psr:200f0013
[126.044781]sp:ed31dc78 ip:ed31dc30 fp:ed31dc9c
[126.056303]r10:00000000 r9:00001d1e r8:ed31dc78
[126.061547]r7:ed31c000 r6:01092a85 r5:025106c0 r4:EE801C000
[126.068098]r3:00000000 r2:2deda000 r1:00001d1e r0:ee801c00
[126.074650]标志：SVC_32 ISA ARM段用户模式下FIQ上的nzCv IRQ
[126.081812]控制：30c5387d表：ad24bd80 DAC:5555
[126.087578]过程系统登录（pid:500，堆栈限制=0xed31c210）
[126.336637]回溯：
[126.339103][]（uu-kmalloc_-track_-caller）来自[]（uu-kmalloc_-reserve.constprop.15+0x2c/0x78）
[126.349144]r9:0000000 A r8:00000100 r7:c079fd74 r6:025004c0 r5:025004c0 r4:ed31dccf
[126.356920][]（uu kmalloc_reserve.constprop.15）来自[]（uu alloc_skb+0x60/0x144）
[126.366088]r9:0000000 A r8:00000000 r7:ee801cc0 r6:025004c0 r5:0000000 A r4:ca4da240
[126.373864][]（alloc_skb）来自[]（alloc_skb_，带框架+0x50/0x1d4）
[126.382160]r9:0000000 A r8:00000003 r7:c026e1f8 r6:00000000 r5:7fffffff r4:ee01de40
[126.389935][]（带碎片的分配）来自[]（sock_alloc_send_pskb+0x1f0/0x20c）
[126.399104]r10:00000000 r9:0000000 A r8:ee01df84 r7:c026e1f8 r6:ed31c000 r5:7fffffff
[126.406960]r4:ee01de40
[126.409505][]（sock_alloc_send_pskb）from[]（unix_dgram_sendmsg+0x138/0x648）
[126.418500]r10:00000016 r9:00000000 r8:0000000 A r7:dff2b500 r6:ee01de40 r5:ed31df48
[126.426356]r4:00000000
[126.428901][]（unix_dgram_sendmsg）from[]（sock_sendmsg+0x1c/0x2c）
[126.437023]r10:00004000 r9:00000000 r8:ed31de28 r7:dff2b500 r6:00000000 r5:00000000
[126.444880]r4:ed31df48
[126.447423][]（sock_sendmsg）from[]（系统发送消息+0x1d8/0x1e8）
[126.455371][]（系统发送消息）来自[]（系统发送消息+0x48/0x74）
[126.463231]r10:00000000 r9:ed31c000 r8:c0207d84 r7:00000128 r6:dff2b500 r5:00004000
[126.471089]r4:be80da10
[126.473630][]（系统发送消息）来自[]（系统发送消息+0x10/0x14）
[126.481227]r6:00000010 r5:be80dfa3 r4:be80da10
[126.485864][]（SyS_sendmsg）from[]（ret_fast_syscall+0x0/0x34）

不看代码很难说。它总是发生吗？加载模块后多久？加载模块一段时间后会发生这种情况。无法找出发生的原因和地点。什么是PSNAP模块？您正在尝试为其创建netdevice设备驱动程序吗？我不是在创建NetU设备对象，而是在linux源代码中使用路径为net/802/的psnap模块。我使用proto->request函数指针将数据发送到网络子系统。不看代码很难说。它总是发生吗？加载模块后多久？加载模块一段时间后会发生这种情况。无法找出发生的原因和地点。什么是PSNAP模块？您正在尝试为其创建netdevice设备驱动程序吗？我不是在创建NetU设备对象，而是在linux源代码中使用路径为net/802/的psnap模块。我使用proto->request函数指针将数据发送到网络子系统。