Christian Lamparter wrote: > On Friday 16 January 2009 23:10:25 Artur Skawina wrote: >> Christian Lamparter wrote: >>> On Friday 16 January 2009 10:13:07 Johannes Berg wrote: >>>> On Thu, 2009-01-15 at 21:18 -0600, Larry Finger wrote: >>>> >>>>>>> Object 0xddec18d0: >69< 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ikkkkkkkkkkkkkkk >>>>> I too have seen real single bit changes - in my case 6b went to 6a, >>>>> and my memory is fine. I wouldn't necessarily blame your hardware. >>>> 6b to 6a is often the result of a refcounting bug that happens to unref >>>> a value _after_ it has been freed. But that doesn't explain 6b to 69, >>>> unless you happen to have _two_ refcounting bugs. Not that I necessarily >>>> think that memory is bad >>> Well, this idiotic debug patch (kref-kernel-debug-patch) could shed some light into >>> the problem who's using a freed skb. >> didn't trigger anything here, just the usual: >> >> BUG kmalloc-4096: Poison overwritten >> ----------------------------------------------------------------------------- >> >> INFO: 0xdc8161b0-0xdc8161b0. First byte 0x6a instead of 0x6b >> INFO: Allocated in dev_alloc_skb+0x19/0x30 age=1762 cpu=0 pid=3530 >> INFO: Freed in __kfree_skb+0xf/0x90 age=613 cpu=0 pid=3527 >> INFO: Slab 0xc1390200 objects=7 used=5 fp=0xdc816120 flags=0x400020c2 >> INFO: Object 0xdc816120 @offset=24864 fp=0xdc8140c0 >> >> but no other warnings... > but the refcount-test-module.c works on your system? > > It should produce something like: yes, that works. RefTest RefTest - Static released dfb02f10 RefTest - Watermark test ------------[ cut here ]------------ WARNING: at lib/kref.c:67 kref_put+0x65/0xb0() Modules linked in: refcount_test_module(+) netconsole saa7134_empress saa6752hs lnbp21 s5h1420 saa7134 videobuf_dma_sg budget videobuf_core tveeprom budget_ci budget_core saa7146 ttpci_eeprom serio_raw ir_common [last unloaded: microcode] Pid: 3592, comm: insmod Not tainted 2.6.29-rc1-00280-g0fe8b7d-dirty #49 Call Trace: [<c04d3a46>] ? printk+0x18/0x1a [<c0122cb3>] warn_slowpath+0x73/0xd0 [<c01274ba>] ? irq_exit+0x2a/0x80 [<c0110803>] ? smp_apic_timer_interrupt+0x43/0x80 [<c0103714>] ? apic_timer_interrupt+0x28/0x30 [<c0123800>] ? vprintk+0x110/0x2e0 [<e2060000>] ? reftst_release+0x0/0x18 [refcount_test_module] [<c04d3a46>] ? printk+0x18/0x1a [<e2060016>] ? reftst_release+0x16/0x18 [refcount_test_module] [<e2060000>] ? reftst_release+0x0/0x18 [refcount_test_module] [<c0245955>] kref_put+0x65/0xb0 [<e2063000>] ? reftst_init+0x0/0xbd [refcount_test_module] [<e2063074>] reftst_init+0x74/0xbd [refcount_test_module] [<e2063000>] ? reftst_init+0x0/0xbd [refcount_test_module] [<c010102a>] _stext+0x2a/0x150 [<c0145cc8>] sys_init_module+0x88/0x1c0 [<c016face>] ? sys_close+0x6e/0xb0 [<c0103146>] sysenter_do_call+0x12/0x25 [<c04d0000>] ? p54u_probe+0xa0/0x13c0 ---[ end trace 5d36c2dda20ece59 ]--- RefTest - slXb poison test ------------[ cut here ]------------ WARNING: at lib/kref.c:67 kref_put+0x65/0xb0() Modules linked in: refcount_test_module(+) netconsole saa7134_empress saa6752hs lnbp21 s5h1420 saa7134 videobuf_dma_sg budget videobuf_core tveeprom budget_ci budget_core saa7146 ttpci_eeprom serio_raw ir_common [last unloaded: microcode] Pid: 3592, comm: insmod Tainted: G W 2.6.29-rc1-00280-g0fe8b7d-dirty #49 Call Trace: [<c04d3a46>] ? printk+0x18/0x1a [<c0122cb3>] warn_slowpath+0x73/0xd0 [...] ============================================================================= BUG kmalloc-96: Poison overwritten ----------------------------------------------------------------------------- INFO: 0xdeaedda0-0xdeaedda0. First byte 0x6a instead of 0x6b INFO: Allocated in 0xe2063083 age=6932 cpu=0 pid=3592 INFO: Freed in 0xe20630af age=6928 cpu=0 pid=3592 INFO: Slab 0xc13d5da0 objects=28 used=26 fp=0xdeaedd80 flags=0x400000c2 INFO: Object 0xdeaedd80 @offset=3456 fp=0xdeaed480 artur -- 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
