在 Linux Kernel 3.4.5 和 ARM 处理器上运行的设备上进行测试时，我收到以下 Oops 消息。我无法跟踪问题。如果您查看调用堆栈，您会看到它从 ret_fast_syscall() 开始，现在实际上 sysrq for Crash 已在代码内部触发，但我没有从哪里得到。我怎样才能找到它。我安装了劳特巴赫，但不知道从哪里可以找到内核代码的哪一部分实际上触发了这个 SysRq。
[50728.239318] C0 [ sh] SysRq : Trigger a crash
[50728.239501] C0 [ sh] **************** READ GIC status
[50728.239654] C0 [ sh] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[50728.239776] C0 [ sh] pgd = ebc9c000
[50728.239929] C0 [ sh] [00000000] *pgd=00000000
[50728.240081] C0 [ sh] Internal error: Oops: 805 [#1] PREEMPT SMP ARM
[50728.240234] C0 [ sh] kona_fb: die notifier invoked
[50728.240356] C0 [ sh] Modules linked in: bcmdhd dm_crypt(O) moc_crypto(PO) moc_platform_mod(O) texfat(PO)
[50728.241088] C0 [ sh] CPU: 0 Tainted: P W O (3.4.5-g4192471-dirty #116)
[50728.241271] C0 [ sh] PC is at sysrq_handle_crash+0x14/0x20
[50728.241424] C0 [ sh] LR is at __handle_sysrq+0xa0/0x14c
[50728.241516] C0 [ sh] pc : [<c026ad48>] lr : [<c026b210>] psr: 60000093
[50728.241516] C0 [ sh] sp : ebd0ff20 ip : 0000000c fp : 4003a404
[50728.241821] C0 [ sh] r10: 4070002c r9 : edbc2f0c r8 : 00000000
[50728.241912] C0 [ sh] r7 : 60000013 r6 : 00000063 r5 : 00000007 r4 : c0a26b90
[50728.242065] C0 [ sh] r3 : 00000001 r2 : 00000000 r1 : c07ab3a2 r0 : 00000063
[50728.242248] C0 [ sh] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[50728.242401] C0 [ sh] Control: 10c53c7d Table: adc9c06a DAC: 00000015
[50728.242492] C0 [ sh]
.................. (Register Contents).............
[50728.284851] C0 [ sh] Stack: (0xebd0ff20 to 0xebd10000)
[50728.284942] C0 [ sh] ff20: 00000002 c026b2bc ec2a4ef0 ebd0ff88 00000002 c026b2e0 edbc2ec0 c014c840
[50728.285125] C0 [ sh] ff40: 00000002 ec2a4ef0 4070002c ebd0ff88 00000002 ebd0e000 00000000 c0109d24
[50728.285308] C0 [ sh] ff60: ec2a4ef0 4070002c ec2a4ef0 4070002c 00000000 00000000 00000002 c0109f5c
[50728.285491] C0 [ sh] ff80: 00000001 00000000 00000000 00000000 00000003 00000002 00000001 00000004
[50728.285675] C0 [ sh] ffa0: c000e304 c000e140 00000003 00000002 00000001 4070002c 00000002 ffffffff
[50728.285858] C0 [ sh] ffc0: 00000003 00000002 00000001 00000004 4070002c 00000000 406ffc84 4003a404
[50728.286010] C0 [ sh] ffe0: 40035f38 bea5e710 40020257 40150e44 20000010 00000001 00000000 00000000
[50728.286224] C0 [ sh] [<c026ad48>] (sysrq_handle_crash+0x14/0x20) from [<c026b210>] (__handle_sysrq+0xa0/0x14c)
***[50728.286376] C0 [ sh] [<c026b210>] (__handle_sysrq+0xa0/0x14c) from [<c026b2e0>] (write_sysrq_trigger+0x24/0x34)
[50728.286560] C0 [ sh] [<c026b2e0>] (write_sysrq_trigger+0x24/0x34) from [<c014c840>] (proc_reg_write+0x80/0x94)
[50728.286682] C0 [ sh] [<c014c840>] (proc_reg_write+0x80/0x94) from [<c0109d24>] (vfs_write+0xb0/0x128)
[50728.286865] C0 [ sh] [<c0109d24>] (vfs_write+0xb0/0x128) from [<c0109f5c>] (sys_write+0x38/0x64)
[50728.287048] C0 [ sh] [<c0109f5c>] (sys_write+0x38/0x64) from [<c000e140>] (ret_fast_syscall+0x0/0x48)***
[50728.287200] C0 [ sh] Code: e3a03001 e5823000 f57ff04f e3a02000 (e5c23000)
[50728.287384] C0 [ sh] ---[ end trace 1b75b31a2719ed7e ]---
[50728.287475] C0 [ sh] Kernel panic - not syncing: Fatal exception