Hi I do not have a testcase to reproduce it. Kernel is 2.6.38-07035-g6447f55d BUG (null): Not a valid slab page ----------------------------------------------------------------------------- INFO: Slab 0xf6c1dcc0 objects=65535 used=65535 fp=0x (null) flags=0x40000401 Pid: 6, comm: rcu_kthread Tainted: G W 2.6.38-07035-g6447f55d #1 Call Trace: [<c1366f9f>] ? printk+0x18/0x21 [<c109866c>] slab_err+0x6c/0x80 [<c1098a2f>] ? slab_pad_check+0x2f/0x150 [<c1098a2f>] ? slab_pad_check+0x2f/0x150 [<c1047b2d>] ? sched_clock_cpu+0x7d/0xf0 [<c1098c1c>] check_slab+0xcc/0x120 [<c1099408>] ? init_object+0x38/0x70 [<c1066125>] ? rcu_process_callbacks+0x55/0x90 [<c10999fa>] free_debug_processing+0x1a/0x220 [<c105197b>] ? trace_hardirqs_off+0xb/0x10 [<c10544d9>] ? debug_check_no_locks_freed+0x129/0x140 [<c1066125>] ? rcu_process_callbacks+0x55/0x90 [<c1099cac>] __slab_free+0xac/0x140 [<c13079f0>] ? inetpeer_free_rcu+0x10/0x20 [<c1066125>] ? rcu_process_callbacks+0x55/0x90 [<c1099f7b>] kmem_cache_free+0xeb/0x100 [<c13079f0>] ? inetpeer_free_rcu+0x10/0x20 [<c13079f0>] ? inetpeer_free_rcu+0x10/0x20 [<c109efd0>] ? file_free_rcu+0x0/0x30 [<c13079f0>] inetpeer_free_rcu+0x10/0x20 [<c106612a>] ? rcu_process_callbacks+0x5a/0x90 [<c1066245>] ? rcu_kthread+0xe5/0x100 [<c1042100>] ? autoremove_wake_function+0x0/0x50 [<c1066160>] ? rcu_kthread+0x0/0x100 [<c1041e14>] ? kthread+0x74/0x80 [<c1041da0>] ? kthread+0x0/0x80 [<c136f5fa>] ? kernel_thread_helper+0x6/0xd FIX (null): Object at 0xc1066125 not freed BUG: unable to handle kernel NULL pointer dereference at 00000002 IP: [<f64665e0>] 0xf64665e0 *pde = 00000000 Oops: 0002 [#1] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed Modules linked in: hwmon_vid sata_sil i2c_nforce2 Pid: 6, comm: rcu_kthread Tainted: G W 2.6.38-07035-g6447f55d #1 /NF7-S/NF7,NF7-V (nVidia-nForce2) EIP: 0060:[<f64665e0>] EFLAGS: 00010286 CPU: 0 EIP is at 0xf64665e0 EAX: 00000002 EBX: db384030 ECX: 00000000 EDX: 00000000 ESI: d8805700 EDI: 00000283 EBP: c106612a ESP: f6479f58 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Process rcu_kthread (pid: 6, ti=f6478000 task=f64665e0 task.ti=f6478000) Stack: f6479f74 f6479f80 f6479f94 c1066245 00000001 f64665e0 00000202 00000000 f64665e0 c1042100 f6479f80 f6479f80 f6469f30 00000000 c1066160 f6479fe4 c1041e14 00000000 00000000 00000000 00000001 dead4ead ffffffff ffffffff Call Trace: [<c1066245>] ? rcu_kthread+0xe5/0x100 [<c1042100>] ? autoremove_wake_function+0x0/0x50 [<c1066160>] ? rcu_kthread+0x0/0x100 [<c1041e14>] ? kthread+0x74/0x80 [<c1041da0>] ? kthread+0x0/0x80 [<c136f5fa>] ? kernel_thread_helper+0x6/0xd Code: 94 02 c1 00 00 00 00 1b 08 00 00 bf c8 02 00 89 8c 02 c1 00 00 00 00 06 00 00 00 8c c8 02 00 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 00 00 00 00 80 47 f6 02 00 00 00 40 a0 20 80 00 00 00 00 ff EIP: [<f64665e0>] 0xf64665e0 SS:ESP 0068:f6479f58 CR2: 0000000000000002 ---[ end trace 8a45d2bc24cd677d ]--- Kernel panic - not syncing: Fatal exception in interrupt Pid: 6, comm: rcu_kthread Tainted: G D W 2.6.38-07035-g6447f55d #1 Call Trace: [<c1366f9f>] ? printk+0x18/0x21 [<c1366e9e>] panic+0x57/0x140 [<c136afcf>] oops_end+0x8f/0x90 [<c101b284>] no_context+0xb4/0x150 [<c101b3ad>] __bad_area_nosemaphore+0x8d/0x130 [<c104fbea>] ? tick_dev_program_event+0x3a/0x130 [<c136cc7e>] ? do_page_fault+0x1ee/0x480 [<c136ca90>] ? do_page_fault+0x0/0x480 [<c136ca90>] ? do_page_fault+0x0/0x480 [<c101b462>] bad_area_nosemaphore+0x12/0x20 [<c136cd6c>] do_page_fault+0x2dc/0x480 [<c103020d>] ? irq_exit+0x3d/0x90 [<c136a24c>] ? restore_all_notrace+0x0/0x18 [<c11e0134>] ? trace_hardirqs_on_thunk+0xc/0x10 [<c136a24c>] ? restore_all_notrace+0x0/0x18 [<c1066125>] ? rcu_process_callbacks+0x55/0x90 [<c106612a>] ? rcu_process_callbacks+0x5a/0x90 [<c136ca90>] ? do_page_fault+0x0/0x480 [<c106612a>] ? rcu_process_callbacks+0x5a/0x90 [<c136a5d1>] error_code+0x5d/0x64 [<c106612a>] ? rcu_process_callbacks+0x5a/0x90 [<c136ca90>] ? do_page_fault+0x0/0x480 [<c1066245>] ? rcu_kthread+0xe5/0x100 [<c1042100>] ? autoremove_wake_function+0x0/0x50 [<c1066160>] ? rcu_kthread+0x0/0x100 [<c1041e14>] ? kthread+0x74/0x80 [<c1041da0>] ? kthread+0x0/0x80 [<c136f5fa>] ? kernel_thread_helper+0x6/0xd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>