Re: [Discuss-gnuradio] Segfault

[Stefan Ott]

Hey

Just curious, have you had a chance to look at this?

Also, in the meantime I tried using your kernel tree
(e100-3.0-pm-2-fixes-from-review) which seems to have a newer version
of the usrp_e driver, built with the kernel configuration that I took
from a working USRP image. However, when trying to modprobe the usrp-e
module, I get:

usrp_e entering driver initialization
Unable to handle kernel NULL pointer dereference at virtual address 0000003c
pgd = c9554000
[0000003c] *pgd=9f843831, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1]
Modules linked in: usrp_e(+)
CPU: 0    Not tainted  (3.0.0 #1)
PC is at usrp_e_init+0x84/0x1c4 [usrp_e]
LR is at usrp_e_init+0x84/0x1c4 [usrp_e]
pc : [<bf004084>]    lr : [<bf004084>]    psr: 60000013
sp : c954deb0  ip : 00000000  fp : 00000000
r10: 0000001c  r9 : 00000024  r8 : 00000001
r7 : bf001a38  r6 : bf001b70  r5 : 00000000  r4 : 00000000
r3 : 00000000  r2 : c954dea4  r1 : bf001914  r0 : 0000000b
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c5387d  Table: 89554019  DAC: 00000015
Process modprobe (pid: 57, stack limit = 0xc954c2f0)
Stack: (0xc954deb0 to 0xc954e000)
dea0:                                     bf004000 00000000 00000000 bf001a38
dec0: bf004000 00000000 c94e6680 c003737c c0569858 00000001 bf001a38 bf001a38
dee0: 00000001 bf001a38 00000001 bf001a80 c94e6680 00000001 00000024 c0088550
df00: bf001a44 000203c0 0065f11c 00000124 c0086288 c03c70bc bf001b5c 0065b018
df20: c943bc28 e08ae000 000246d5 e08c7aac e08c7891 e08d20cc c94950c0 00001b84
df40: 000020e4 00000000 00000000 00000032 00000033 0000001c 00000019 00000017
df60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 c0511494
df80: 00000000 401955b0 00000000 00000000 00000080 c003c484 c954c000 00000000
dfa0: 0065b018 c003c300 401955b0 00000000 401bc008 000246d5 0065b018 bebf89e4
dfc0: 401955b0 00000000 00000000 00000080 00016f50 000203c0 0065f11c 0065b018
dfe0: 40143cd8 bebf89e4 0000c25c 40143ce8 20000010 401bc008 e1a06007 1afffff7
[<bf004084>] (usrp_e_init+0x84/0x1c4 [usrp_e]) from [<c003737c>] (do_one_initca)
[<c003737c>] (do_one_initcall+0x90/0x160) from [<c0088550>] (sys_init_module+0x)
[<c0088550>] (sys_init_module+0x1628/0x181c) from [<c003c300>] (ret_fast_syscal)
Code: eb48b539 e5860010 e59f011c eb4ee213 (e584503c)
---[ end trace 784c802e29369acf ]---
Segmentation fault

This seems to happen in usrp_e.c on line 854: atomic_set(&p->mapped,
0); - I assume that, for some reason, "p" isn't properly initialized.
You wouldn't by any chance have some idea about what might be wrong
there?

Furthermore, sorry for the nagging :)

cheers
-- 
Stefan Ott
Communication and Distributed Systems
Institute of Computer Science and Applied Mathematics
University of Bern