在调试Android设备死机问题时，最初认为可能是硬件故障，但发现部分设备正常运行。通过对比旧内核，确认问题出在软件上。经过分析，错误发生在电压调节器的相关代码被屏蔽，导致死机。通过对linux内核中regulator模块的源码比较，发现相关函数#if 0被错误地更改为#if 1，从而禁用了电压设置和获取的功能，修正后解决了问题。
最近调试了一个死机问题，错误打印如下，刚开始怀疑是硬件问题，因为有40%的机器是正常工作的，剩下的60%机器死机时长也是不尽相同。后来发现更换到旧的内核去编译就是正常的，所以确认是软件问题
Starting kernel ...
[ 0.643128] aw_pm_init: not support super standby.
[ 0.872894] sw_ahci sw_ahci.0: SATA power enable do not exist!!
[ 0.883294] can't get item for emac_power gpio !
[ 1.408658] rtc_hw_init(416) err: set clksrc to external losc failed! rtc time will be wrong
[ 1.418207] sunxi_rtc_gettime(34): err, losc_err_flag is 1
[ 1.476700] [hdmi]hdmi module init
[ 1.482292] ##fb init:w=1280,h=720,fbmode=3
[ 1.504666] sunxi_rtc_gettime(34): err, losc_err_flag is 1
[ 1.510793] sunxi-rtc sunxi-rtc: hctosys: unable to read the hardware clock
[ 3.670941] init: HDMI status = 0, try 40 times!TV status = 0
[ 3.883660] init: start e2fsck listening...
[ 4.373635] init: do_umount: /data
[ 4.704422] init: do_umount: /cache
[ 4.802597] init: dont need format /dev/block/UDISK
[ 4.808538] init: dont need format /dev/block/private
[ 4.829357] init: do_umount: /databk
[ 4.888299] init: C_IN_START
[ 4.891325] init: path = /dev/block/data
[ 4.895761] init: C_IN_START
[ 4.899207] init: path = /dev/block/cache
[ 5.358460] init: untracked pid 1124 exited
[ 5.379911] init: using deprecated syntax for specifying property 'sys.usb.config', use ${name} instead
[ 5.397403] init: using deprecated syntax for specifying property 'sys.usb.config', use ${name} instead
[ 5.824463] usb 4-1.1: device descriptor read/all, error -71
[ 6.163865] usb 4-1.1: device descriptor read/all, error -71
[ 6.364122] usb 4-1.1: device descriptor read/8, error -71
[ 7.753425] init: untracked pid 1441 exited
[ 7.758217] init: untracked pid 1443 exited
[ 9.073282] init: untracked pid 1618 exited
[ 12.426753] sunxi_rtc_gettime(34): err, losc_err_flag is 1
[ 24.351300] sunxi_rtc_gettime(34): err, losc_err_flag is 1
[ 24.360635] init: sys_prop: permission denied uid:1003 name:service.bootanim.exit
[ 204.410660] Unable to handle kernel paging request at virtual address 00d1d086
[ 204.419177] pgd = ecf28000
[ 204.422282] [00d1d086] *pgd=00000000
[ 204.426491] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 204.432468] Modules linked in: gpio_sunxi 8188eu rtl8150 uvcvideo videobuf_dma_contig videobuf_core utiusb(O) usb_simple(O) UTi1203(O) fe(O) fd650(O) mali(O) ump(O) sun7i_ir nand(O) [last unloaded: gpio_sunxi]
[ 204.453623] CPU: 1 Tainted: G W O (3.4.39 #6)
[ 204.459739] PC is at lock_hrtimer_base+0x18/0x48
[ 204.464956] LR is at hrtimer_try_to_cancel+0x10/0x88
[ 204.470565] pc : [<c006ba7c>] lr : [<c006bc98>] psr: 20000013
[ 204.470583] sp : ecfefdd8 ip : ecfefe70 fp : 00000000
[ 204.483499] r10: ffffff92 r9 : 5c160190 r8 : 00000000
[ 204.489395] r7 : ecfefe80 r6 : 00d1d086 r5 : ecfefdec r4 : ecfefe29
[ 204.496740] r3 : 00000000 r2 : ecfefe08 r1 : ecfefdec r0 : ecfefe29
[ 204.504112] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 204.512165] Control: 10c5387d Table: 6cf2806a DAC: 00000015
[ 204.518653]
[ 204.518663] PC: 0xc006b9fc:
[ 204.523480] b9fc e5922008 e2941008 30d11002 33a02000 e3520000 13e0000d 1a000006 e1a00004
[ 204.532801] ba1c e1a01003 e3a02008 eb066105 e3500000 03a00001 13e0000d e28dd01c e8bd80f0
[ 204.542121] ba3c e92d4008 e3a02000 e5903030 e5802030 e1530002 0a000001 e1a00003 eb001f14
[ 204.551438] ba5c e3a00000 e8bd8008 e92d4070 e1a04000 e1a05001 e5946024 e3560000 0a00000a
[ 204.560629] ba7c e5960000 eb120278 e5850000 e1a01000 e5943024 e1560003 1a000001 e1a00006
[ 204.569816] ba9c e8bd8070 e5960000 eb12013a eafffff0 e92d40f0 e24dd014 e1a04001 e1a05000
[ 204.578998] babc e1a00001 e28d100c ebffffe6 e5943024 e1a0000d e1c461d0 e5933020 e12fff33
[ 204.588181] badc e1cd20d0 e59d100c e0566002 e0c77003 e5943024 e5930000 eb120126 e1c560f0
[ 204.597376]
[ 204.597381] LR: 0xc006bc18:
[ 204.602153] bc18 e7922101 e7933002 e3530000 0a00000a e1c423d0 e1c581d0 e5940000 e0588002
[ 204.611334] bc38 e0c99003 e1c021d0 e1530009 01520008 1a000001 e3a01001 ebffffac e5943010
[ 204.620521] bc58 e3530000 1a000005 e5943000 e3a00001 e5942004 e5931008 e1c12210 e5832008
[ 204.629704] bc78 e5856028 e8bd83f8 c071e618 c0730480 e92d40f7 e1a04000 e28d1004 ebffff72
[ 204.638884] bc98 e5945028 e1a07000 e3150002 13e05000 1a000010 e2155001 0a00000e e5905000
[ 204.648069] bcb8 eb06a2dc e59f3044 e1a01007 e5942028 e59f603c e7933100 e1a00004 e2022002
[ 204.657253] bcd8 e0863003 e063c005 e3a05001 e27c3000 e0a3300c ebffffb3 e5943024 e59d1004
[ 204.666436] bcf8 e5930000 eb1200a4 e1a00005 e8bd80fe c0730480 c071e600 e92d4010 e1a04000
[ 204.675621]
[ 204.675624] SP: 0xecfefd58:
[ 204.680393] fd58 d1d091d0 00000000 00000000 ee8ea340 c0008f3c c0720000 00000002 c006d5a0
[ 204.689582] fd78 ffffffff c006ba7c 20000013 ffffffff ecfefdc4 c000d498 ecfefe29 ecfefdec
[ 204.698768] fd98 ecfefe08 00000000 ecfefe29 ecfefdec 00d1d086 ecfefe80 00000000 5c160190
[ 204.707950] fdb8 ffffff92 00000000 ecfefe70 ecfefdd8 c006bc98 c006ba7c 20000013 ffffffff
[ 204.717132] fdd8 ecfefe29 ecfefe29 ecfeff78 c006bc98 ecfefe29 ecfefe70 ecfefe08 ecfefe29
[ 204.726315] fdf8 ecfefe29 ecfeff78 ecfefe80 c006bd20 ecfee000 c00879ec ecfefe9c 00000000
[ 204.735499] fe18 e6e21c40 00000001 972365a3 0000002f ecfefe29 00000000 00000000 00000000
[ 204.744678] fe38 972365a3 0000002f 9722a253 0000002f c006ba3c d1d08638 00000000 00000000
[ 204.753860]
[ 204.753863] IP: 0xecfefdf0:
[ 204.758633] fdf0 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20 ecfee000 c00879ec
[ 204.767816] fe10 ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f ecfefe29 00000000
[ 204.776999] fe30 00000000 00000000 972365a3 0000002f 9722a253 0000002f c006ba3c d1d08638
[ 204.786183] fe50 00000000 00000000 00000000
[ 204.790720] qtaguid: ctrl_tag(t 52 18446742978492891136 10027): insufficient priv from pid=2454 tgid=2144 uid=10010
[ 204.802626] ecfee000
[ 204.803010] qtaguid: ctrl_tag(t 50 18446742978492891136 10007): insufficient priv from pid=2464 tgid=2144 uid=10010
[ 204.809902] qtaguid: ctrl_tag(t 51 18446742978492891136 10027): insufficient priv from pid=2435 tgid=2144 uid=10010
[ 204.828493] 59f670c0 00000064 ecfefe68 ecfefe68
[ 204.833672] fe70 ecfefe70 ecfefe70 ef38b140 c079cb38 5c160000 ecdc1e40 00000190 00000000
[ 204.842854] fe90 00000000 00000000 ffffffff c079cb38 ef38b140 00000000 5c160190 5c160190
[ 204.852036] feb0 00000000 00000000 ecfee000 5c160190 00000000 c0088d34 ffffffff 00000000
[ 204.861220] fed0 5de0cab0 c0386534 ecfefef8 00000000 0000e001 00000000 00000000 00000000
[ 204.870400]
[ 204.870404] R0: 0xecfefda9:
[ 204.875174] fda8 00d1d086 ecfefe80 00000000 5c160190 ffffff92 00000000 ecfefe70 ecfefdd8
[ 204.884359] fdc8 c006bc98 c006ba7c 20000013 ffffffff ecfefe29 ecfefe29 ecfeff78 c006bc98
[ 204.893544] fde8 ecfefe29 ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20
[ 204.902729] fe08 ecfee000 c00879ec ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f
[ 204.911910] fe28 ecfefe29 00000000 00000000 00000000 972365a3 0000002f 9722a253 0000002f
[ 204.921088] fe48 c006ba3c d1d08638 00000000 00000000 00000000 ecfee000 59f670c0 00000064
[ 204.930274] fe68 ecfefe68 ecfefe68 ecfefe70 ecfefe70 ef38b140 c079cb38 5c160000 ecdc1e40
[ 204.939462] fe88 00000190 00000000 00000000 00000000 ffffffff c079cb38 ef38b140 00000000
[ 204.948643] fea8 5c160190 5c160190 00000000 00000000 ecfee000 5c160190 00000000 c0088d34
[ 204.957829]
[ 204.957832] R1: 0xecfefd6c:
[ 204.962604] fd6c c0720000 00000002 c006d5a0 ffffffff c006ba7c 20000013 ffffffff ecfefdc4
[ 204.971785] fd8c c000d498 ecfefe29 ecfefdec ecfefe08 00000000 ecfefe29 ecfefdec 00d1d086
[ 204.980969] fdac ecfefe80 00000000 5c160190 ffffff92 00000000 ecfefe70 ecfefdd8 c006bc98
[ 204.990157] fdcc c006ba7c 20000013 ffffffff ecfefe29 ecfefe29 ecfeff78 c006bc98 ecfefe29
[ 204.999338] fdec ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20 ecfee000
[ 205.008522] fe0c c00879ec ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f ecfefe29
[ 205.017701] fe2c 00000000 00000000 00000000 972365a3 0000002f 9722a253 0000002f c006ba3c
[ 205.026882] fe4c d1d08638 00000000 00000000 00000000 ecfee000 59f670c0 00000064 ecfefe68
[ 205.036066]
[ 205.036070] R2: 0xecfefd88:
[ 205.040841] fd88 ecfefdc4 c000d498 ecfefe29 ecfefdec ecfefe08 00000000 ecfefe29 ecfefdec
[ 205.050021] fda8 00d1d086 ecfefe80 00000000 5c160190 ffffff92 00000000 ecfefe70 ecfefdd8
[ 205.059206] fdc8 c006bc98 c006ba7c 20000013 ffffffff ecfefe29 ecfefe29 ecfeff78 c006bc98
[ 205.068389] fde8 ecfefe29 ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20
[ 205.077571] fe08 ecfee000 c00879ec ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f
[ 205.086751] fe28 ecfefe29 00000000 00000000 00000000 972365a3 0000002f 9722a253 0000002f
[ 205.095931] fe48 c006ba3c d1d08638 00000000 00000000 00000000 ecfee000 59f670c0 00000064
[ 205.105116] fe68 ecfefe68 ecfefe68 ecfefe70 ecfefe70 ef38b140 c079cb38 5c160000 ecdc1e40
[ 205.114302]
[ 205.114306] R4: 0xecfefda9:
[ 205.119077] fda8 00d1d086 ecfefe80 00000000 5c160190 ffffff92 00000000 ecfefe70 ecfefdd8
[ 205.128264] fdc8 c006bc98 c006ba7c 20000013 ffffffff ecfefe29 ecfefe29 ecfeff78 c006bc98
[ 205.137451] fde8 ecfefe29 ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20
[ 205.146640] fe08 ecfee000 c00879ec ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f
[ 205.155825] fe28 ecfefe29 00000000 00000000 00000000 972365a3 0000002f 9722a253 0000002f
[ 205.165006] fe48 c006ba3c d1d08638 00000000 00000000 00000000 ecfee000 59f670c0 00000064
[ 205.174186] fe68 ecfefe68 ecfefe68 ecfefe70 ecfefe70 ef38b140 c079cb38 5c160000 ecdc1e40
[ 205.183370] fe88 00000190 00000000 00000000 00000000 ffffffff c079cb38 ef38b140 00000000
[ 205.192551] fea8 5c160190 5c160190 00000000 00000000 ecfee000 5c160190 00000000 c0088d34
[ 205.201738]
[ 205.201741] R5: 0xecfefd6c:
[ 205.206512] fd6c c0720000 00000002 c006d5a0 ffffffff c006ba7c 20000013 ffffffff ecfefdc4
[ 205.215694] fd8c c000d498 ecfefe29 ecfefdec ecfefe08 00000000 ecfefe29 ecfefdec 00d1d086
[ 205.224877] fdac ecfefe80 00000000 5c160190 ffffff92 00000000 ecfefe70 ecfefdd8 c006bc98
[ 205.234059] fdcc c006ba7c 20000013 ffffffff ecfefe29 ecfefe29 ecfeff78 c006bc98 ecfefe29
[ 205.243247] fdec ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78 ecfefe80 c006bd20 ecfee000
[ 205.252428] fe0c c00879ec ecfefe9c 00000000 e6e21c40 00000001 972365a3 0000002f ecfefe29
[ 205.261605] fe2c 00000000 00000000 00000000 972365a3 0000002f 9722a253 0000002f c006ba3c
[ 205.270784] fe4c d1d08638 00000000 00000000 00000000 ecfee000 59f670c0 00000064 ecfefe68
[ 205.279963]
[ 205.279966] R7: 0xecfefe00:
[ 205.284737] fe00 ecfefe80 c006bd20 ecfee000 c00879ec ecfefe9c 00000000 e6e21c40 00000001
[ 205.293922] fe20 972365a3 0000002f ecfefe29 00000000 00000000 00000000 972365a3 0000002f
[ 205.303110] fe40 9722a253 0000002f c006ba3c d1d08638 00000000 00000000 00000000 ecfee000
[ 205.312296] fe60 59f670c0 00000064 ecfefe68 ecfefe68 ecfefe70 ecfefe70 ef38b140 c079cb38
[ 205.321478] fe80 5c160000 ecdc1e40 00000190 00000000 00000000 00000000 ffffffff c079cb38
[ 205.330659] fea0 ef38b140 00000000 5c160190 5c160190 00000000 00000000 ecfee000 5c160190
[ 205.339842] fec0 00000000 c0088d34 ffffffff 00000000 5de0cab0 c0386534 ecfefef8 00000000
[ 205.349022] fee0 0000e001 00000000 00000000 00000000 59f68a78 00000100 00000030 59f670c0
[ 205.358213] Process DisplayManagerP (pid: 1996, stack limit = 0xecfee2f8)
[ 205.365803] Stack: (0xecfefdd8 to 0xecff0000)
[ 205.370675] fdc0: ecfefe29 ecfefe29
[ 205.379824] fde0: ecfeff78 c006bc98 ecfefe29 ecfefe70 ecfefe08 ecfefe29 ecfefe29 ecfeff78
[ 205.388973] fe00: ecfefe80 c006bd20 ecfee000 c00879ec ecfefe9c 00000000 e6e21c40 00000001
[ 205.398122] fe20: 972365a3 0000002f ecfefe29 00000000 00000000 00000000 972365a3 0000002f
[ 205.407271] fe40: 9722a253 0000002f c006ba3c d1d08638 00000000 00000000 00000000 ecfee000
[ 205.416423] fe60: 59f670c0 00000064 ecfefe68 ecfefe68 ecfefe70 ecfefe70 ef38b140 c079cb38
[ 205.425572] fe80: 5c160000 ecdc1e40 00000190 00000000 00000000 00000000 ffffffff c079cb38
[ 205.434720] fea0: ef38b140 00000000 5c160190 5c160190 00000000 00000000 ecfee000 5c160190
[ 205.443870] fec0: 00000000 c0088d34 ffffffff 00000000 5de0cab0 c0386534 ecfefef8 00000000
[ 205.453019] fee0: 0000e001 00000000 00000000 00000000 59f68a78 00000100 00000030 59f670c0
[ 205.462172] ff00: eeb71070 5de0cab0 ef0b72c0 0000000a c000daa8 ecfee000 00000000 c00d94dc
[ 205.471321] ff20: 00000000 00000000 c0727bc0 ecfeff70 34ff2b0c 00000000 0003a64c 00000000
[ 205.480472] ff40: 00000000 00000080 00000001 00000000 ecfee000 5c160190 00000000 c0089760
[ 205.489620] ff60: 5c160190 00000000 ffffffff 00000001 9722a253 0000002f 9722a253 0000002f
[ 205.498770] ff80: 00000000 1dcd383e 5de0cd40 5c160190 5c160180 00000000 000000f0 c000daa8
[ 205.507922] ffa0: 00000000 c000d900 5c160190 5c160180 5c160190 00000080 00000000 5de0cd40
[ 205.517070] ffc0: 5c160190 5c160180 00000000 000000f0 00000000 00000000 00000001 00000000
[ 205.526220] ffe0: 00000000 5de0cd20 400be420 400c8108 60000010 5c160190 00000000 00000000
[ 205.535398] [<c006ba7c>] (lock_hrtimer_base+0x18/0x48) from [<c006bc98>] (hrtimer_try_to_cancel+0x10/0x88)
[ 205.546204] [<c006bc98>] (hrtimer_try_to_cancel+0x10/0x88) from [<c006bd20>] (hrtimer_cancel+0x10/0x20)
[ 205.556722] [<c006bd20>] (hrtimer_cancel+0x10/0x20) from [<c00879ec>] (futex_wait+0x1dc/0x1fc)
[ 205.566361] [<c00879ec>] (futex_wait+0x1dc/0x1fc) from [<c0088d34>] (do_futex+0xc4/0x9cc)
[ 205.575516] [<c0088d34>] (do_futex+0xc4/0x9cc) from [<c0089760>] (sys_futex+0x124/0x168)
[ 205.584574] [<c0089760>] (sys_futex+0x124/0x168) from [<c000d900>] (ret_fast_syscall+0x0/0x30)
[ 205.594214] Code: e1a05001 e5946024 e3560000 0a00000a (e5960000)
[ 205.602175] ---[ end trace 42a35a83d6714e08 ]---
[ 205.607393] Kernel panic - not syncing: Fatal exception
[ 205.613302] CPU0: stopping
[ 205.616364] [<c00142a8>] (unwind_backtrace+0x0/0xe0) from [<c0012818>] (handle_IPI+0xf8/0x1d4)
[ 205.626011] [<c0012818>] (handle_IPI+0xf8/0x1d4) from [<c00084e0>] (gic_handle_irq+0x50/0x58)
[ 205.635563] [<c00084e0>] (gic_handle_irq+0x50/0x58) from [<c000d500>] (__irq_svc+0x40/0x70)
[ 205.644910] Exception stack(0xeb3f7e08 to 0xeb3f7e50)
[ 205.650566] 7e00: ecaf9e90 5da99000 5da9a000 eb3f6000 eb3f7efc 00000000
[ 205.659723] 7e20: 00000000 00000000 ecaf9e90 e981176c 5da9a000 5da9a000 ecaf9e90 eb3f7e50
[ 205.668877] 7e40: c00b980c c0012d10 20000013 ffffffff
[ 205.674535] [<c000d500>] (__irq_svc+0x40/0x70) from [<c0012d10>] (flush_tlb_range+0x8/0x7c)
[ 205.683889] [<c0012d10>] (flush_tlb_range+0x8/0x7c) from [<c00b980c>] (unmap_single_vma+0x4ec/0x508)
[ 205.694118] [<c00b980c>] (unmap_single_vma+0x4ec/0x508) from [<c00ba030>] (unmap_vmas+0x38/0x54)
[ 205.703958] [<c00ba030>] (unmap_vmas+0x38/0x54) from [<c00bd11c>] (unmap_region+0xa4/0x198)
[ 205.713311] [<c00bd11c>] (unmap_region+0xa4/0x198) from [<c00be064>] (do_munmap+0x218/0x27c)
[ 205.722761] [<c00be064>] (do_munmap+0x218/0x27c) from [<c00be104>] (vm_munmap+0x3c/0x50)
[ 205.731824] [<c00be104>] (vm_munmap+0x3c/0x50) from [<c000d900>] (ret_fast_syscall+0x0/0x30)
[ 205.741268] [hotplug]: try to kill cpu:0 failed!
经查，是电压调节器部分代码被屏蔽导致
--- linux-3.4/drivers/regulator/core.c (版本 246)
+++ linux-3.4/drivers/regulator/core.c (版本 247)
@@ -1948,7 +1948,7 @@
*/
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
-#if 0
+#if 1
struct regulator_dev *rdev = regulator->rdev;
int ret = 0;
@@ -1984,8 +1984,9 @@
out:
mutex_unlock(&rdev->mutex);
return ret;
+#else
+return 0;
#endif
-return 0;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage);
@@ -2083,7 +2084,7 @@
static int _regulator_get_voltage(struct regulator_dev *rdev)
{
-#if 0
+#if 1
int sel, ret;
if (rdev->desc->ops->get_voltage_sel) {
@@ -2100,8 +2101,10 @@
if (ret < 0)
return ret;
return ret - rdev->constraints->uV_offset;
+#else
+
+return 0;
#endif
-return 0;
}
/**
@@ -2115,7 +2118,7 @@
*/
int regulator_get_voltage(struct regulator *regulator)
{
- /*
+#if 1
int ret;
mutex_lock(®ulator->rdev->mutex);
@@ -2125,9 +2128,10 @@
mutex_unlock(®ulator->rdev->mutex);
return ret;
- */
+#else
return 0;
+#endif
}
EXPORT_SYMBOL_GPL(regulator_get_voltage);
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