On Fri, Nov 14, 2008 at 8:29 PM, Bob Copeland <me@xxxxxxxxxxxxxxx> wrote: > On Fri, Nov 14, 2008 at 08:05:09PM -0600, Dan McGee wrote: >> On Fri, Nov 14, 2008 at 6:36 PM, Luis R. Rodriguez >> Of course, now that I have a kernel with full debug symbols, I can't >> get it to oops. Figures. I'll keep you updated if I see this error >> again. > > Grasping at straws, is there any chance your kernel didn't match up > with the compiled modules from compat-wireless? For example, you > reconfigured the kernel without rebuilding it, then compat-wireless > picked up your .config? I suppose that could lead to structures being > defined with wrong offsets... I doubt it; I'm compiling the whole enchilada in one go so it should definitely match up. I just reproduced it with a brand new build after going back to a no-symbols kernel. Here is a transcribed OOPS dump since this one leaves the machine in a state where it doesn't even finish booting up. I can *only* get this if I compile without debugging symbols, and looking at the call trace, you can see the apic_timer_interrupt call which leads me to believe it is some sort of timing/race issue that a debug kernel doesn't run into. -Dan BUG: unable to handle kernel NULL pointer dereference at 00000082 IP: [<7818ca71>] sysfs_find_dirent+0x9/0x23 Oops: 0000 [#1] PREEMPT Modules linked in: ath5k(+) mac80211 Pid: 818 comm: modprobe Not tainted (2.6.27.6eee #1) EIP: 0060:[<7818ca71>] EFLAGS: 00010206 CPU: 0 EIP is at sysfs_find_dirent+0x9/0x23 EAX: 00000001 EBX: 00000072 ECX: 00000001 EDX: b730b4f0 ESI: b730b4f0 EDI: fffffff4 EBP: b7311490 ESP: b73ffd34 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 Stack: <<<i'm too lazy>>>> Call Trace: [<7818cb39>]: __sysfs_add_one+0x10/0x69 [<7818cba2>]: sysfs_add_one+0x9/0x2f [<7818d0bc>]: create_dir+0x3c/0x62 sysfs_create_dir+0x29/0x3b kobject_get kobject_add_internal kobject_add device_add+0x75/0x456 apic_timer_interrupt+0x28/0x30 strlcpy+0x11/0x3e register_netdevice+0x1f1/0x31a ieee80211_register_hw+0x1eb/0x2d0 [mac80211] ath5k_pci_probe+0xc27/0x1150 [ath5k] find_inode pci_device_probe driver_probe_device ....... init_ath5k_pci [ath5k] ....... ============== Code: dd 85 c0 53 89 c3 74 16 83 38 00 75 0f ba 82 00 00 00 b8 f7 75 3c 78 e8 70 da f8 ff ff 03 89 d8 5b c3 56 89 d6 53 8b 58 18 eb 11 <8b> 43 10 89 f2 e8 34 cc 04 00 85 c0 74 07 8b 5b 0c 85 db 75 eb $ AFLAGS=--32 scripts/decodecode < /tmp/oops.txt Code: dd 85 c0 53 89 c3 74 16 83 38 00 75 0f ba 82 00 00 00 b8 f7 75 3c 78 e8 70 da f8 ff ff 03 89 d8 5b c3 56 89 d6 53 8b 58 18 eb 11 <8b> 43 10 89 f2 e8 34 cc 04 00 85 c0 74 07 8b 5b 0c 85 db 75 eb /tmp/tmp.xJNdgiQwSL.o: file format elf32-i386 Disassembly of section .text: 00000000 <.text>: 0: dd 85 c0 53 89 c3 fldl -0x3c76ac40(%ebp) 6: 74 16 je 0x1e 8: 83 38 00 cmpl $0x0,(%eax) b: 75 0f jne 0x1c d: ba 82 00 00 00 mov $0x82,%edx 12: b8 f7 75 3c 78 mov $0x783c75f7,%eax 17: e8 70 da f8 ff call 0xfff8da8c 1c: ff 03 incl (%ebx) 1e: 89 d8 mov %ebx,%eax 20: 5b pop %ebx 21: c3 ret 22: 56 push %esi 23: 89 d6 mov %edx,%esi 25: 53 push %ebx 26: 8b 58 18 mov 0x18(%eax),%ebx 29: eb 11 jmp 0x3c /tmp/tmp.xJNdgiQwSL.o: file format elf32-i386 Disassembly of section .text: 00000000 <.text>: 0: 8b 43 10 mov 0x10(%ebx),%eax 3: 89 f2 mov %esi,%edx 5: e8 34 cc 04 00 call 0x4cc3e a: 85 c0 test %eax,%eax c: 74 07 je 0x15 e: 8b 5b 0c mov 0xc(%ebx),%ebx 11: 85 db test %ebx,%ebx 13: 75 eb jne 0x0 And the objdump output from that function, but my novice eyes can't pick out where the above code corresponds to: 0000027d <__sysfs_add_one>: 27d: 56 push %esi 27e: 89 c6 mov %eax,%esi 280: 53 push %ebx 281: 89 d3 mov %edx,%ebx 283: 8b 00 mov (%eax),%eax 285: 8b 52 10 mov 0x10(%edx),%edx 288: e8 fc ff ff ff call 289 <__sysfs_add_one+0xc> 28d: ba ef ff ff ff mov $0xffffffef,%edx 292: 85 c0 test %eax,%eax 294: 75 4b jne 2e1 <__sysfs_add_one+0x64> 296: 8b 06 mov (%esi),%eax 298: e8 fe fe ff ff call 19b <sysfs_get> 29d: 80 7b 1c 01 cmpb $0x1,0x1c(%ebx) 2a1: 89 43 08 mov %eax,0x8(%ebx) 2a4: 75 0a jne 2b0 <__sysfs_add_one+0x33> 2a6: 8b 46 04 mov 0x4(%esi),%eax 2a9: 85 c0 test %eax,%eax 2ab: 74 03 je 2b0 <__sysfs_add_one+0x33> 2ad: ff 40 28 incl 0x28(%eax) 2b0: ff 46 0c incl 0xc(%esi) 2b3: 83 7b 0c 00 cmpl $0x0,0xc(%ebx) 2b7: 8b 43 08 mov 0x8(%ebx),%eax 2ba: 74 04 je 2c0 <__sysfs_add_one+0x43> 2bc: 0f 0b ud2a 2be: eb fe jmp 2be <__sysfs_add_one+0x41> 2c0: 8d 48 18 lea 0x18(%eax),%ecx 2c3: 8b 50 18 mov 0x18(%eax),%edx 2c6: eb 0e jmp 2d6 <__sysfs_add_one+0x59> 2c8: 8b 43 20 mov 0x20(%ebx),%eax 2cb: 3b 42 20 cmp 0x20(%edx),%eax 2ce: 72 0a jb 2da <__sysfs_add_one+0x5d> 2d0: 8d 4a 0c lea 0xc(%edx),%ecx 2d3: 8b 52 0c mov 0xc(%edx),%edx 2d6: 85 d2 test %edx,%edx 2d8: 75 ee jne 2c8 <__sysfs_add_one+0x4b> 2da: 89 53 0c mov %edx,0xc(%ebx) 2dd: 31 d2 xor %edx,%edx 2df: 89 19 mov %ebx,(%ecx) 2e1: 5b pop %ebx 2e2: 89 d0 mov %edx,%eax 2e4: 5e pop %esi 2e5: c3 ret -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
