Hi Linux and Alexandre,
>From time to time (probability of 5% around), the following script triggers an
Oops on my platform on v4.3 kernel. Is this something you have already seen ?
ssh mio "echo 504 > /sys/class/gpio/export"
ssh mio "echo out > /sys/class/gpio/gpio504/direction"
ssh mio "echo 1 > /sys/class/gpio/gpio504/value"
The faulting line is :
rj@belgarion:~/mio_linux/kernel$ arm-linux-gnueabi-addr2line -i -e vmlinux
0xc0232ff4
/home/rj/mio_linux/kernel/drivers/gpio/gpiolib-sysfs.c:608 (discriminator 1)
Which in my kernel translates to :
if (chip->names && chip->names[offset])
The Oops:
[ 55.608907] Unable to handle kernel paging request at virtual address
03020120
[ 55.616932] pgd = c30ec000
[ 55.620567] [03020120] *pgd=00000000
[ 55.624468] Internal error: Oops: f5 [#1] PREEMPT ARM
[ 55.628020] Modules linked in:
[ 55.631339] CPU: 0 PID: 978 Comm: sh Tainted: G W 4.3.0+ #1245
[ 55.637844] Hardware name: MIO A701
[ 55.641094] task: c33247e0 ti: c30de000 task.ti: c30de000
[ 55.644417] PC is at gpiod_export+0x264/0x3b8
[ 55.647683] LR is at gpiod_export+0x210/0x3b8
[ 55.650899] pc : [<c0232ff4>] lr : [<c0232fa0>] psr: 20000013
[ 55.650899] sp : c30dfe20 ip : c30dfe20 fp : c30dfe54
[ 55.660400] r10: 00000051 r9 : c30dff80 r8 : c3b98910
[ 55.663591] r7 : 00000001 r6 : c32f96e0 r5 : 00000000 r4 : c3b9e980
[ 55.669847] r3 : 00000018 r2 : 00000008 r1 : 03020100 r0 : c32f96e4
[ 55.676130] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 55.682444] Control: 0000397f Table: a30ec000 DAC: 00000051
[ 55.688845] Process sh (pid: 978, stack limit = 0xc30de198)
[ 55.695262] Stack: (0xc30dfe20 to 0xc30e0000)
[ 55.698520] fe20: c30dfe54 c30dfe30 c023124c c022e7a4 00000004 00000000
c3b9e980 b6fce000
[ 55.704974] fe40: c33ea60c c30dff80 c30dfe7c c30dfe58 c02331d0 c0232d9c
000000d0 000001f8
[ 55.711444] fe60: c30dfea4 c32f91a0 00000004 c32f91a0 c30dfe8c c30dfe80
c028b4d0 c0233154
[ 55.717922] fe80: c30dfea4 c30dfe90 c014dba4 c028b4b4 c014db58 c33ea600
c30dfedc c30dfea8
[ 55.724400] fea0: c014d4d8 c014db64 00000000 00000000 c30dfefc c33e39a0
c30dff80 b6fce000
[ 55.730886] fec0: c30dff80 c000a728 c30de000 00020000 c30dff4c c30dfee0
c00e501c c014d3a0
[ 55.737386] fee0: c30dff80 c000a728 c30dff0c c30dfef8 c0040700 c0099df8
00000000 00000001
[ 55.743895] ff00: c30dff24 c30dff10 c004c5b0 c00406d0 c30c9d6c 00000004
c30dff3c c30dff28
[ 55.750414] ff20: c004c6a8 c004c570 c33e39a0 c33e39a0 00000004 b6fce000
c30dff80 c000a728
[ 55.756944] ff40: c30dff7c c30dff50 c00e5650 c00e4ff4 00000003 c0103a38
c30dff7c c33e39a0
[ 55.763477] ff60: c33e39a0 00000004 b6fce000 c000a728 c30dffa4 c30dff80
c00e5eb8 c00e55ac
[ 55.770026] ff80: 00000000 00000000 b6ed4658 00000004 b6fce000 00000004
00000000 c30dffa8
[ 55.776617] ffa0: c000a560 c00e5e70 b6ed4658 00000004 00000001 b6fce000
00000004 00000000
[ 55.783225] ffc0: b6ed4658 00000004 b6fce000 00000004 00000004 000ad16c
ffffffff 00000000
[ 55.789863] ffe0: 00000004 bec9e5e8 b6e270a8 b6e6c1cc 60000010 00000001
00000000 00000000
[ 55.796633] (gpiod_export) from export_store
(/drivers/gpio/gpiolib-sysfs.c:475)
[ 55.803423] (export_store) from class_attr_store (/drivers/base/class.c:46)
[ 55.810275] (class_attr_store) from sysfs_kf_write (/fs/sysfs/file.c:131)
[ 55.817176] (sysfs_kf_write) from kernfs_fop_write (/fs/kernfs/file.c:316)
[ 55.824143] (kernfs_fop_write) from __vfs_write (/fs/read_write.c:489)
[ 55.831115] (__vfs_write) from vfs_write (/include/linux/fs.h:1215
/include/linux/fsnotify.h:215 /fs/read_write.c:540)
[ 55.838107] (vfs_write) from SyS_write (/fs/read_write.c:586
/fs/read_write.c:577)
[ 55.845096] (SyS_write) from ret_fast_syscall
(/arch/arm/kernel/entry-common.S:62)
[ 55.852074] Code: e0822402 e0822802 e0832082 0a00003c (e7913102)
All code
========
0: e0822402 add r2, r2, r2, lsl #8
4: e0822802 add r2, r2, r2, lsl #16
8: e0832082 add r2, r3, r2, lsl #1
c: 0a00003c beq 0x104
10:* e7913102 ldr r3, [r1, r2, lsl #2] <-- trapping
instruction
Code starting with the faulting instruction
===========================================
0: e7913102 ldr r3, [r1, r2, lsl #2]
[ 55.859591] ---[ end trace 8ef5b92cfa7b4ed3 ]---
[ 77.502907] random: nonblocking pool is initialized
Cheers.
--
Robert
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