I was playing with (a romfs) initrd and modularising everything, including ext2 and ide-*. (gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)) More info on request. ksymoops 2.4.0 on i686 2.4.5-ac5-4. Options used -V (default) -k /proc/ksyms (default) -l /proc/modules (default) -o /lib/modules/2.4.5-ac5-4/ (default) -m /boot/System.map-2.4.5-ac5-4 (default) Warning: You did not tell me where to find symbol information. I will assume that the log matches the kernel and modules that are running right now and I'll use the default options above for symbol resolution. If the current kernel and/or modules do not match the log, you can get more accurate output by telling me the kernel version and where to find map, modules, ksyms etc. ksymoops -h explains the options. Error (expand_objects): cannot stat(/lib/ext2.o) for ext2 ksymoops: No such file or directory Error (expand_objects): cannot stat(/lib/eepro100.o) for eepro100 ksymoops: No such file or directory Error (expand_objects): cannot stat(/lib/ide-disk.o) for ide-disk ksymoops: No such file or directory Error (expand_objects): cannot stat(/lib/ide-probe-mod.o) for ide-probe-mod ksymoops: No such file or directory Error (expand_objects): cannot stat(/lib/ide-mod.o) for ide-mod ksymoops: No such file or directory kernel BUG at slab.c:1200! invalid operand: 0000 CPU: 0 EIP: 0010:[<c01280d9>] EFLAGS: 00210082 eax: 0000001b ebx: c824e000 ecx: 00000001 edx: 00006518 esi: 00000000 edi: c144713c ebp: cd14fa4c esp: c6fd7ee8 ds: 0018 es: 0018 ss: 0018 Process netscape-commun (pid: 3901, stackpage=c6fd7000) Stack: c01bfacb 000004b0 c824e019 cd14fa4c c824f019 c824e019 c01286a5 c144713c cd14fa4c c824e019 00000001 00200246 ce680934 ffffffeb c6fd7f84 cb5c0de4 c013bafe c144713c c824e019 c6fd7f84 ce680934 00000001 00000002 fffffffb Call Trace: [<c01286a5>] [<c013bafe>] [<c013e3d8>] [<c0130254>] [<c0130543>] [<c0106e5b>] Code: 0f 0b 5a 59 8b 5d 14 83 fb ff 74 2b 8d 74 26 00 8d bc 27 00 Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/net/ipv4/netfilter/netfilter.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/net/ipv6/netfilter/netfilter.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/md/mddev.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/net/wireless/orinoco_drvs.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/char/drm/drm.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/misc/misc.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/cdrom/driver.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/media/radio/radio.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/media/video/video.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/media/media.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/sound/sounddrivers.o Warning (read_object): no symbols in /lib/modules/2.4.5-ac5-4/build/drivers/parport/driver.o Warning (map_ksym_to_module): cannot match loaded module ext2 to a unique module object. Trace may not be reliable. Warning (map_ksym_to_module): cannot match loaded module eepro100 to a unique module object. Trace may not be reliable. Warning (map_ksym_to_module): cannot match loaded module ide-disk to a unique module object. Trace may not be reliable. Warning (map_ksym_to_module): cannot match loaded module ide-probe-mod to a unique module object. Trace may not be reliable. Warning (map_ksym_to_module): cannot match loaded module ide-mod to a unique module object. Trace may not be reliable. Reading Oops report from the terminal kernel BUG at slab.c:1200! invalid operand: 0000 CPU: 0 EIP: 0010:[<c01280d9>] Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00210082 eax: 0000001b ebx: c824e000 ecx: 00000001 edx: 00006518 esi: 00000000 edi: c144713c ebp: cd14fa4c esp: c6fd7ee8 ds: 0018 es: 0018 ss: 0018 Process netscape-commun (pid: 3901, stackpage=c6fd7000) Stack: c01bfacb 000004b0 c824e019 cd14fa4c c824f019 c824e019 c01286a5 c144713c cd14fa4c c824e019 00000001 00200246 ce680934 ffffffeb c6fd7f84 cb5c0de4 c013bafe c144713c c824e019 c6fd7f84 ce680934 00000001 00000002 fffffffb Call Trace: [<c01286a5>] [<c013bafe>] [<c013e3d8>] [<c0130254>] [<c0130543>] [<c0106e5b>] Code: 0f 0b 5a 59 8b 5d 14 83 fb ff 74 2b 8d 74 26 00 8d bc 27 00 >>EIP; c01280d9 <kmem_extra_free_checks+59/a0> <===== Trace; c01286a5 <kmem_cache_free+215/2c0> Trace; c013bafe <open_namei+5ee/600> Trace; c013e3d8 <vfs_readdir+58/80> Trace; c0130254 <filp_open+34/60> Trace; c0130543 <sys_open+33/b0> Trace; c0106e5b <system_call+33/38> Code; c01280d9 <kmem_extra_free_checks+59/a0> 00000000 <_EIP>: Code; c01280d9 <kmem_extra_free_checks+59/a0> <===== 0: 0f 0b ud2a <===== Code; c01280db <kmem_extra_free_checks+5b/a0> 2: 5a pop %edx Code; c01280dc <kmem_extra_free_checks+5c/a0> 3: 59 pop %ecx Code; c01280dd <kmem_extra_free_checks+5d/a0> 4: 8b 5d 14 mov 0x14(%ebp),%ebx Code; c01280e0 <kmem_extra_free_checks+60/a0> 7: 83 fb ff cmp $0xffffffff,%ebx Code; c01280e3 <kmem_extra_free_checks+63/a0> a: 74 2b je 37 <_EIP+0x37> c0128110 <kmem_extra_free_checks+90/a0> Code; c01280e5 <kmem_extra_free_checks+65/a0> c: 8d 74 26 00 lea 0x0(%esi,1),%esi Code; c01280e9 <kmem_extra_free_checks+69/a0> 10: 8d bc 27 00 00 00 00 lea 0x0(%edi,1),%edi 18 warnings and 5 errors issued. 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