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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20050714/9fb1f609/attachment.htm
