From: "Anton Wöllert" <a.woellert@gmail.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-ppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: ptrace on linux 2.6.12 causes oops
Date: Thu, 14 Jul 2005 10:23:20 +0200 [thread overview]
Message-ID: <faba7798050714012370af5e74@mail.gmail.com> (raw)
In-Reply-To: <20050701101713.GC11121@logos.cnet>
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Hello
when i try to run strace or gdbserver on a program, the following comes:
Oops: kernel access of bad area, sig: 11 [#2]
NIP: C000543C LR: C000B060 SP: C0F35DF0 REGS: c0f35d40 TRAP: 0300 Not
tainted
MSR: 00009022 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 10
DAR: 00000010, DSISR: C2000000
TASK = c0ea8430[761] 'gdbserver' THREAD: c0f34000
Last syscall: 26
GPR00: 00009022 C0F35DF0 C0EA8430 00F59000 00000100 FFFFFFFF 00F58000
00000001
GPR08: C021DAEF C0270000 00009032 C0270000 22044024 10025428 01000800
00000001
GPR16: 007FFF3F 00000001 00000000 7FBC6AC0 00F61022 00000001 C0839300
C01E0000
GPR24: 00CD0889 C082F568 3000AC18 C02A7A00 C0EA15C8 00F588A9 C02ACB00
C02ACB00
NIP [c000543c] __flush_dcache_icache_phys+0x38/0x54
LR [c000b060] flush_dcache_icache_page+0x20/0x30
Call trace:
[c000b154] update_mmu_cache+0x7c/0xa4
[c005ae98] do_wp_page+0x460/0x5ec
[c005c8a0] handle_mm_fault+0x7cc/0x91c
[c005ccec] get_user_pages+0x2fc/0x65c
[c0027104] access_process_vm+0x9c/0x1d4
[c00076e0] sys_ptrace+0x240/0x4a4
[c0002bd0] ret_from_syscall+0x0/0x44
mm/memory.c:2054: spin_lock(kernel/fork.c:c0ea1618) already locked by
mm/memory.c/1306
and strace or gdbserver of course says segmentation fault. with gdbserver,
this happens every time. with strace, the first time it works nearly all
time, but when i strace a second time program again, it segfaults. i think
the access_process_vm is accessed trough PEEKDATA and PEEKTEXT in
sys_ptrace. so here some more debug :) :
DEBUG: peekdata @ 1006d4ec
DEBUG: peektext @ 1006d4f0
DEBUG: peekdata @ 1006d4f0
DEBUG: peektext @ 1006d4f4
DEBUG: peekdata @ 1006d4f4
DEBUG: peektext @ 1006d4f8
DEBUG: peekdata @ 1006d4f8
DEBUG: peektext @ 1006d4fc
DEBUG: peekdata @ 1006d4fc
DEBUG: peektext @ 1006d500
DEBUG: peekdata @ 1006d500
DEBUG: peektext @ 1006d504
DEBUG: peekdata @ 1006d504
DEBUG: peektext @ 1006d508
DEBUG: peekdata @ 1006d508
DEBUG: peektext @ 1006d50c
DEBUG: peekdata @ 1006d50c
DEBUG: peektext @ 1006d510
DEBUG: peekdata @ 1006d510
DEBUG: peektext @ 1006d514
DEBUG: peekdata @ 1006d514
DEBUG: peektext @ 1006d518
DEBUG: peekdata @ 1006d518
DEBUG: peektext @ 1006d51c
DEBUG: peekdata @ 1006d51c
DEBUG: peektext @ 1006d520
DEBUG: peekdata @ 1006d520
DEBUG: peektext @ 1006d524
DEBUG: peekdata @ 1006d524
DEBUG: peektext @ 1006d528
DEBUG: peekdata @ 1006d528
DEBUG: peektext @ 1006d52c
DEBUG: peekdata @ 1006d52c
DEBUG: peektext @ 00000000
DEBUG: peekdata @ 00000000
DEBUG: peektext @ 3000ac18
DEBUG: peekdata @ 3000ac18
DEBUG: peektext @ 3000ac18
DEBUG: peekdata @ 3000ac18
DEBUG: flush_dcache_icache_page
Oops: kernel access of bad area, sig: 11 [#2]
NIP: C000543C LR: C000B060 SP: C0F35DF0 REGS: c0f35d40 TRAP: 0300 Not
tainted
MSR: 00009022 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 10
DAR: 00000010, DSISR: C2000000
TASK = c0ea8430[761] 'gdbserver' THREAD: c0f34000
Last syscall: 26
GPR00: 00009022 C0F35DF0 C0EA8430 00F59000 00000100 FFFFFFFF 00F58000
00000001
GPR08: C021DAEF C0270000 00009032 C0270000 22044024 10025428 01000800
00000001
GPR16: 007FFF3F 00000001 00000000 7FBC6AC0 00F61022 00000001 C0839300
C01E0000
GPR24: 00CD0889 C082F568 3000AC18 C02A7A00 C0EA15C8 00F588A9 C02ACB00
C02ACB00
NIP [c000543c] __flush_dcache_icache_phys+0x38/0x54
LR [c000b060] flush_dcache_icache_page+0x20/0x30
Call trace:
[c000b154] update_mmu_cache+0x7c/0xa4
[c005ae98] do_wp_page+0x460/0x5ec
[c005c8a0] handle_mm_fault+0x7cc/0x91c
[c005ccec] get_user_pages+0x2fc/0x65c
[c0027104] access_process_vm+0x9c/0x1d4
[c00076e0] sys_ptrace+0x240/0x4a4
[c0002bd0] ret_from_syscall+0x0/0x44
mm/memory.c:2054: spin_lock(kernel/fork.c:c0ea1618) already locked by
mm/memory.c/1306
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next prev parent reply other threads:[~2005-07-14 8:29 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <42C1AAC1.4060702@gmail.com>
[not found] ` <20050629085913.GA2153@logos.cnet>
[not found] ` <faba7798050630071347d4ad63@mail.gmail.com>
2005-07-01 9:44 ` mpc8xx and ld.so problem Marcelo Tosatti
2005-07-01 14:55 ` Jason McMullan
2005-07-01 10:17 ` Marcelo Tosatti
2005-07-01 18:56 ` Jason McMullan
2005-07-01 14:42 ` Marcelo Tosatti
2005-07-04 8:22 ` Yuli Barcohen
2005-07-05 19:53 ` Tom Rini
2005-07-06 8:58 ` Yuli Barcohen
2005-07-08 0:36 ` Marcelo Tosatti
2005-07-10 7:31 ` Yuli Barcohen
2005-07-13 15:41 ` Theo Gjaltema
2005-07-13 20:32 ` Wolfgang Denk
2005-07-13 21:32 ` Theo Gjaltema
2005-07-13 23:11 ` Wolfgang Denk
2005-07-14 5:44 ` Anton Wöllert
2005-07-14 8:23 ` Anton Wöllert [this message]
2005-07-14 13:31 ` ptrace on linux 2.6.12 causes oops Kumar Gala
2005-07-14 11:20 ` Marcelo Tosatti
[not found] ` <faba77980507140809ad923db@mail.gmail.com>
2005-07-14 15:11 ` Anton Wöllert
2005-07-14 20:27 ` aris
2005-07-14 11:19 ` Marcelo Tosatti
2005-07-15 9:42 ` Anton Wöllert
2005-07-15 5:03 ` Marcelo Tosatti
2005-07-03 16:01 ` mpc8xx and ld.so problem Anton Wöllert
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