On Thu, Jul 31, 2008 at 10:56 AM, Andrew Morton wrote:> On Thu, 31 Jul 2008 10:06:31 +0800 "Dave Young" wrote:>>>>> Ok here it is.>> BTW, I run "klogd -c 7" after boot>> The sysrq output is still missing lots of stuff. I guess we broke it.>>>>> This time I get a kmalloc poison overwritten:>>>> Thanks, sorry for that caused by webmail. >> =============================================================================> BUG kmalloc-4096: Poison overwritten> ----------------------------------------------------------------------------->> INFO: 0xf6f3a080-0xf6f3a0ef. First byte 0x80 instead of 0x6b> INFO: Allocated in dev_alloc_skb+0x1c/0x30 age=3642 cpu=0 pid=0> INFO: Freed in skb_release_data+0x57/0x80 age=3146 cpu=0 pid=2398> INFO: Slab 0xc1c05440 objects=7 used=3 fp=0xf6f3a060 flags=0x400020c3> INFO: Object 0xf6f3a060 @offset=8288 fp=0xf6f39030>> Bytes b4 0xf6f3a050: 5e 09 00 00 57 c9 05 00 5a 5a 5a 5a 5a 5a 5a 5a ^...WÉ..ZZZZZZZZ> Object 0xf6f3a060: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk> Object 0xf6f3a070: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk> Object 0xf6f3a080: 80 00 00 00 ff ff ff ff ff ff 00 17 7b 00 46 40 ....ÿÿÿÿÿÿ..{.F@> Object 0xf6f3a090: 00 17 7b 00 46 40 30 09 81 21 08 7a 21 00 00 00 ..{.F@0..!.z!...> Object 0xf6f3a0a0: 64 00 21 04 00 07 00 00 00 00 00 00 00 01 08 82 d.!.............> Object 0xf6f3a0b0: 84 8b 0c 12 96 18 24 03 01 01 05 04 00 02 00 00 ......$.........> Object 0xf6f3a0c0: 07 06 43 4e 20 01 0d 14 2a 01 00 32 04 30 48 60 ..CN....*..2.0H`> Object 0xf6f3a0d0: 6c dd 18 00 17 7b 01 04 00 00 00 01 00 00 00 10 lÝ...{..........> Redzone 0xf6f3b060: bb bb bb bb »»»»> Padding 0xf6f3b088: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ> Pid: 0, comm: swapper Tainted: G W 2.6.26-smp #2> [] print_trailer+0xad/0xf0> [] check_bytes_and_report+0x9b/0xc0> [] check_object+0x19e/0x1e0> [] __slab_alloc+0x454/0x4f0> [] __kmalloc_track_caller+0xe6/0xf0> [] ? dev_alloc_skb+0x1c/0x30> [] ? dev_alloc_skb+0x1c/0x30> [] __alloc_skb+0x49/0x100> [] dev_alloc_skb+0x1c/0x30> [] ath5k_rxbuf_setup+0x39/0x200 [ath5k]> [] ath5k_tasklet_rx+0x127/0x5c0 [ath5k]> [] ? print_lock_contention_bug+0x1a/0xe0> [] tasklet_action+0x4c/0xc0> [] __do_softirq+0x93/0x120> [] do_softirq+0x57/0x60> [] irq_exit+0x69/0x80> [] do_IRQ+0x45/0x80> [] ? mwait_idle+0x0/0x50> [] common_interrupt+0x2e/0x34> [] ? mwait_idle+0x0/0x50> [] ? mwait_idle+0x39/0x50> [] cpu_idle+0x60/0xd0> [] rest_init+0x4e/0x60> =======================> FIX kmalloc-4096: Restoring 0xf6f3a080-0xf6f3a0ef=0x6b>> FIX kmalloc-4096: Marking all objects used> [] ? security_file_permission+0xf/0x20> [] sys_select+0x3f/0x190> [] ? fput+0x19/0x20> [] ? restore_nocheck+0x12/0x15> [] ? trace_hardirqs_on+0xbd/0x140> [] syscall_call+0x7/0xb> =======================>> argh, that stuff hurts my brain. None of the numbers seem to make any> sense for a 4k allocation :( Pekka, do you have time to decrypt this?>> Dave, could you please remind us which net driver was in use here?>> It's the ath5k -- Regardsdave{.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I