Hi all, This is a peculiar Oops we are encountering during the running of our board (sh4) architecture we are some times getting Oops messages like this Unable to handle kernel NULL pointer dereference at virtual address 00000004
pc = 844240f8 *pde = 00000000 Oops: 0001 [#1] Pid : 529, Comm: cvm PC is at run_timer_softirq+0x58/0x220 PC : 844240f8 SP : 88d1ff44 SR : 400080f0 TEA : c0169d64 Tainted: P R0 : 00000000 R1 : 88d1ff44 R2 : 00000000 R3 : 846fa08c R4 : 846fa084 R5 : 846fae8c R6 : 00000001 R7 : 00000000 R8 : 00000000 R9 : 846fa084 R10 : 84424020 R11 : 88d1ff0c R12 : 88d1ff44 R13 : 846fba08 R14 : ffffffd3 MACH: 00000050 MACL: 00000078 GBR : 397b6938 PR : 844241a2 Call trace: [<8442137a>] __do_softirq+0x7a/0x120 [<844218a6>] irq_exit+0x66/0x80 [<84407e80>] do_IRQ+0x0/0x60 [<84407eb8>] do_IRQ+0x38/0x60 [<84405070>] ret_from_irq+0x0/0x10 Kernel panic - not syncing: Aiee, killing interrupt handler! I think this crash is a generic problem in our kernel configuration. can any one help? >From the log, is it possible to tell what may cause these kind of behavior? The same crash is happening at different times during different operations. Please Give you valuable suggestions!! Regards, Sreejith M M Engineer||D&D Tata Elxsi Limited _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ganesh Kumar N M Sent: Thursday, October 16, 2008 6:56 PM To: [EMAIL PROTECTED]; linuxppc-embedded@ozlabs.org Cc: Ganesh Kumar NM Subject: Loadable module crashes at kernel stack overflow or machine check Hi All, I'm working on MPC860 with Montavista linux 2.4.18 We have a Linux kernel loadable module which on loading panicks after some random time say 8 hours, 4 hours or so the oops outputs say either machine check exception or kernel stack overflow (randomly both show up) are as below: ============================ Machine check in kernel mood/e. Caused by lPC:M C000A934 XER:3REGS: c0b73cb0 TRAP: 0200 Tainted: PF MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c0b72000[3] 'ksoftirqd_CPU0' Last syscall: -1 last math 00000000 last altivec 00000000 GPR00: 00000000 C0B73D60 C0B72000 00000000 00000000 0000000B 00000000 00000000 GPR08: E244E000 C01A0000 00000014 00000002 00000000 100374B8 1FFFA000 007FFF36 GPR16: 00000000 00000001 007FFF00 FFFFFFFF 00009032 00B73E30 00000000 C00029D4 GPR24: 00000000 00030001 C0B73E40 00000000 00000000 0000000B 08200000 C0B73E40 Call backtrace: C00CB774 C0009CBC C00029D4 C0B73FA0 C00E0208 C00E8800 C00D8920 C0014E98 C0015524 C0004D88 Machine check in kernel mode. Caused by (from SRR1=1032): Transfer error ack signal Oops: machine check, sig: 7 NIP: C000A934 XER: 00000000 LR: C0009EFC SP: C0B73990 REGS: c0b738e0 TRAP: 0200F MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c0b72000[3] 'ksoftirqd_CPU0' Last syscall: -1 last math 00000000 last altivec 00000000 GPR00: 00000000 C0B73990 C0B72000 E20286D0 E242D03C 0000000B C01F6268 E20286D0 GPR08: E244E000 C01A0000 C01B4F1C 00000002 24004028 100374B8 1FFFA000 007FFF36 GPR16: 00000000 00000001 007FFF00 FFFFFFFF 00001032 00B73A60 00000000 C00029D4 GPR24: 00000000 00030001 C0B73A70 E242D03C 00000000 0000000B 88000000 C0B73A70 Call backtrace: C0B73A40 C0009CBC C00029D4 E20286D0 C00CB774 C00039EC C0003AB0 C00029CC C0002B54 C0002C74 C00029D4 C00CB774 C0009CBC C00029D4 C0B73FA0 C00E0208 C00E8800 C00D8920 C0014E98 C0015524 C0004D88 ======================================================== Kernel stack overflow in process c018e030, r1=c018e370 NIP: C000A934 XER: 00000000 LR: C0009EFC SP: C018E370 REGS: c018e2c0 TRAP: 0300 Tainted: PF MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 DAR: E2474034, DSISR: 88000000 TASK = c018e030[0] 'swapper' Last syscall: 120 last math 00000000 last altivec 00000000 GPR00: C0009CBC C018E370 C018E030 C000A934 E2474034 0000000B C0B6C400 C000A934 GPR08: E2474000 C01A0000 00000014 00000002 002AE754 10052EC8 1FFFA000 007FFF1C GPR16: 00000000 00000001 007FFF00 FFFFFFFF 00009032 0018E440 00000000 C00029D4 GPR24: 00000000 00030001 C018E450 E2474034 00000000 0000000B 88000000 C018E450 Call backtrace: 00000000 C0009CBC C00029D4 0000000B C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 Kernel panic: kernel stack overflow In interrupt handler - not syncing <0>Rebooting in 180 seconds.. ======================================================================= Looking at the Ksymoops pointed me to some do_page_fault ksymoops 2.4.6 on i686 2.4.18-3smp. Options used -V (default) -k ksyms (specified) -L (default) -O (default) -m System.map (specified) Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ipt_MASQUERADE .o) for ipt_MASQUERADE Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/iptable_filter .o) for iptable_filter Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ip_nat_ftp.o) for ip_nat_ftp Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/iptable_nat.o) for iptable_nat Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ip_conntrack_i rc.o) for ip_conntrack_irc Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ip_conntrack_f tp.o) for ip_conntrack_ftp Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ip_conntrack.o ) for ip_conntrack Error (expand_objects): cannot stat(/lib/modules/2.4.18_mvl30-fads/kernel/net/ipv4/netfilter/ip_tables.o) for ip_tables Error (expand_objects): cannot stat(/home/ICM/ISDN/sig860el.o) for sig860el Error (expand_objects): cannot stat(/home/ICM/LKM/sysk_procif_ver.o) for sysk_procif_ver Warning (compare_maps): mismatch on symbol xchg_u32 , ksyms_base says c00095e4, System.map says c0004af0. Ignoring ksyms_base entry Kernel stack overflow in process c0a08000, r1=c0a08460 NIP: C000A934 XER: 00000000 LR: C0009EFC SP: C0A08460 REGS: c0a083b0 TRAP: 0300F Using defaults from ksymoops -t elf32-little -a unknown MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c0a08000[1] 'init' Last syscall: 106 last math 00000000 last altivec 00000000 GPR00: 00000000 C0A08460 C0A08000 C000A934 E2433034 0000000B C0B6AA00 C000A934 GPR08: E2433000 C01A0000 DDDDB81E 00000003 CA010101 1001EE38 00000000 00000000 GPR16: 00000000 00000000 00000000 00000000 00009032 00A08530 00000000 C00029D4 GPR24: 00000000 00030001 C0A08540 E2433034 C01AF090 0000000B 88000000 C0A08540 Call backtrace: 00000000 C0009CBC C00029D4 DD394530 C0009CBC C00029D4 00000000 C0009CBC C00029D4 65666175 C0009CBC C00029D4 00000000 C0009CBC C00029D4 CEA99000 C0009CBC C00029D4 C0A08E10 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00000000 C0009CBC C00029D4 00A09320 C0009CBC C00029D4 C0007640 C0009CBC C00029D4 Kernel panic: kernel stack overflow Warning (Oops_read): Code line not seen, dumping what data is available >>???; c000a934 <search_exception_table+14/94> <===== >>GPR1; c0a08460 <_end+80ff96/21e0ab96> >>GPR2; c0a08000 <_end+80fb36/21e0ab96> >>GPR3; c000a934 <search_exception_table+14/94> >>GPR4; e2433034 <[sig860el].bss.end+6001/602d> >>GPR6; c0b6aa00 <_end+972536/21e0ab96> >>GPR7; c000a934 <search_exception_table+14/94> >>GPR8; e2433000 <[sig860el].bss.end+5fcd/602d> >>GPR9; c01a0000 <g_stCfgKSFuncHndl+17d4/1eb0> >>GPR10; ddddb81e <_end+1dbe3354/21e0ab96> >>GPR12; ca010101 <_end+9e17c37/21e0ab96> >>GPR23; c00029d4 <ret_from_except+0/34> >>GPR26; c0a08540 <_end+810076/21e0ab96> >>GPR27; e2433034 <[sig860el].bss.end+6001/602d> >>GPR28; c01af090 <serial_console_setup+58/2a4> >>GPR31; c0a08540 <_end+810076/21e0ab96> Trace; 00000000 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; dd394530 <_end+1d19c066/21e0ab96> Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 00000000 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 65666175 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 00000000 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; cea99000 <_end+e8a0b36/21e0ab96> Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; c0a08e10 <_end+810946/21e0ab96> Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 00000000 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 00000000 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; 00a09320 Before first symbol Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> Trace; c0007640 <__up+38/48> Trace; c0009cbc <do_page_fault+138/358> Trace; c00029d4 <ret_from_except+0/34> So just to check I made the same loadable module as Part of the Kernel and booted my system and it booted fine and runs fine for more than 5 days without any problem. What may be the reason for this? Is there any loading/linking difference between the Linux kernel module(as this is dynamically done) and Part of Kernel (statically linked with the kernel) As the insmod does a vmalloc to allocate the memory for loading the module, does it have some memory allocation problems or something like that? Any pointers will be really helpful,Thanks in advance, Pls cc to me as I'm not subscribed to this list. --Ganesh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments contained in it.
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