From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12195] New: "dd" make kernel panic
Date: Wed, 10 Dec 2008 18:07:18 -0800 (PST)
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http://bugzilla.kernel.org/show_bug.cgi?id=12195
Summary: "dd" make kernel panic
Product: SCSI Drivers
Version: 2.5
KernelVersion: 2.6.28-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
ReportedBy: alex.shi@intel.com
Latest working kernel version:2.6.27
Earliest failing kernel version:2.6.28-rc2
Distribution: RHEL 4u2
Hardware Environment: IA64
Software Environment:
Problem Description:
When we use dd tool to clear a SCSI disk. it may getinto a kernel panic like
below:
Unable to handle kernel NULL pointer dereference (address 0000000000000044)
ksoftirqd/1[6]: Oops 8813272891392 [1]
Modules linked in:
Pid: 6, CPU 1, comm: ksoftirqd/1
psr : 00001010081a6010 ifs : 8000000000000289 ip : [] Not
tainted (2.6.28-rc6)
ip is at scsi_softirq_done+0x50/0x2e0
unat: 0000000000000000 pfs : 0000000000000184 rsc : 0000000000000003
rnat: 0000000000000000 bsps: 0000000000000000 pr : 0000000000005a81
ldrs: 0000000000000000 ccv : 0000000000000002 fpsr: 0009804c8a70433f
csd : 0000000000000000 ssd : 0000000000000000
b0 : a00000010023f910 b6 : a000000100391ca0 b7 : a00000010000b220
f6 : 1003e0000000000001d4c f7 : 1003e0000000000200000
f8 : 1003e0000000080000000 f9 : 1003e0000054a28eb9332
f10 : 1003eb59a50a4dbb025f6 f11 : 1003e00000000000000c7
r1 : a000000100a1b720 r2 : e000000001105e48 r3 : e00000000cff9518
r8 : e00000000cff9510 r9 : ffffffffffff5e48 r10 : 0000000000000018
r11 : 0000000000000044 r12 : e000000008a97e10 r13 : e000000008a90000
r14 : e000000008a97e30 r15 : e000000008a97e38 r16 : 0000000000000020
r17 : 0000000000000030 r18 : e00000000cff9650 r19 : e00000000cff95e0
r20 : a00000010082eea8 r21 : a000000100391ca0 r22 : e000000001e9ab70
r23 : e000000001e9aac8 r24 : e00000000cff9540 r25 : e000000008a97e30
r26 : e000000008a97e30 r27 : e00000000cff9518 r28 : e000000008a97e38
r29 : 0000000000000000 r30 : 0000000000000000 r31 : 0000000000000000
Call Trace:
[] show_stack+0x50/0xa0
sp=e000000008a979e0 bsp=e000000008a90eb0
[] show_regs+0x830/0x860
sp=e000000008a97bb0 bsp=e000000008a90e68
[] die+0x1c0/0x2c0
sp=e000000008a97bb0 bsp=e000000008a90e20
[] ia64_do_page_fault+0x830/0x960
sp=e000000008a97bb0 bsp=e000000008a90db8
[] ia64_native_leave_kernel+0x0/0x270
sp=e000000008a97c40 bsp=e000000008a90db8
[] scsi_softirq_done+0x50/0x2e0
sp=e000000008a97e10 bsp=e000000008a90d70
[] blk_done_softirq+0x170/0x1c0
sp=e000000008a97e20 bsp=e000000008a90d58
[] __do_softirq+0x110/0x2e0
sp=e000000008a97e30 bsp=e000000008a90cc8
[] do_softirq+0x70/0xc0
sp=e000000008a97e30 bsp=e000000008a90c68
[] ksoftirqd+0xf0/0x240
sp=e000000008a97e30 bsp=e000000008a90c40
[] kthread+0xa0/0x120
sp=e000000008a97e30 bsp=e000000008a90c10
[] kernel_thread_helper+0x30/0x60
sp=e000000008a97e30 bsp=e000000008a90be0
[] start_kernel_thread+0x20/0x40
sp=e000000008a97e30 bsp=e000000008a90be0
Kernel panic - not syncing: Aiee, killing interrupt handler!
Steps to reproduce:
while true; do echo "3">/proc/sys/vm/drop_caches; dd if=/dev/sdb2 of=/dev/zero
bs=1024k count=8900; done;
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