crash on SysRq : Show Memory

Aron Griffis
2004-03-09T16:09:04Z

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I'm running davidm's bk kernel, version 2.6.4-rc1, built with gcc-3.3.
I've been poking around with SysRq and hit a crash last evening with the
following footprint. After this the machine was wedged so badly that
the Ethernet MP stopped responding completely, so I was unable to power
cycle the machine until I arrived at the office.

telnet> send brk
SysRq : Show Memory
swapper[0]: Oops 8813272891392 [1]

Pid: 0, CPU 0, comm: swapper
psr : 0000101008026018 ifs : 8000000000000389 ip : [<a00000010005b9e0>] Tainted: GF
ip is at show_mem+0x100/0x260
unat: 0000000000000000 pfs : 0000000000000389 rsc : 0000000000000003
rnat: 0000000000000000 bsps: 0000000000000000 pr : 80000000ff556565
ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f
csd : 0000000000000000 ssd : 0000000000000000
b0 : a00000010005b970 b6 : a00000010006dc70 b7 : a0000001002eda00
f6 : 0fffbccccccccc8c00000 f7 : 0ffdaa200000000000000
f8 : 100008000000000000000 f9 : 10002a000000000000000
f10 : 0fffcccccccccc8c00000 f11 : 1003e0000000000000000
r1 : a000000100afd5c0 r2 : ffffffffffffff05 r3 : 000000000103ffef
r8 : a0000001009174f0 r9 : a0000001009174f0 r10 : 0000000000000000
r11 : a0000001009172a0 r12 : e0000000047ffb90 r13 : e0000000047f8000
r14 : a000000100848510 r15 : a00000010084dcf8 r16 : a0007fffff0fffb0
r17 : 000000000100ffff r18 : a0007fffff0fffd0 r19 : a0007fffaec00000
r20 : a000000100917508 r21 : 0000000000000000 r22 : 000000000504fffb
r23 : 000000000100ffff r24 : 0000000000000000 r25 : 0000000000000001
r26 : 00000000000008eb r27 : 0000000000000001 r28 : a000000100931c12
r29 : 0000000000004b3a r30 : 0000000000000000 r31 : a000000100917258

Call Trace:
[<a000000100018420>] show_stack+0x80/0xa0
sp=e0000000047ff760 bsp=e0000000047f96b8
[<a00000010003ca70>] die+0x170/0x200
sp=e0000000047ff930 bsp=e0000000047f9680
[<a00000010005a850>] ia64_do_page_fault+0x350/0x980
sp=e0000000047ff930 bsp=e0000000047f9618
[<a000000100011540>] ia64_leave_kernel+0x0/0x260
sp=e0000000047ff9c0 bsp=e0000000047f9618
[<a00000010005b9e0>] show_mem+0x100/0x260
sp=e0000000047ffb90 bsp=e0000000047f95c8
[<a0000001003928a0>] sysrq_handle_showmem+0x20/0x40
sp=e0000000047ffb90 bsp=e0000000047f95b0
[<a000000100392dd0>] __handle_sysrq_nolock+0x110/0x260
sp=e0000000047ffb90 bsp=e0000000047f9568
[<a000000100392c90>] handle_sysrq+0x70/0xa0
sp=e0000000047ffb90 bsp=e0000000047f9538
[<a00000010040e110>] receive_chars+0x330/0x680
sp=e0000000047ffb90 bsp=e0000000047f9448
[<a00000010040ebf0>] serial8250_interrupt+0x1b0/0x200
sp=e0000000047ffba0 bsp=e0000000047f93d8
[<a000000100014d40>] handle_IRQ_event+0xa0/0x120
sp=e0000000047ffbb0 bsp=e0000000047f9390
[<a000000100015780>] do_IRQ+0x280/0x380
sp=e0000000047ffbb0 bsp=e0000000047f9340
[<a000000100017400>] ia64_handle_irq+0xa0/0x1a0
sp=e0000000047ffbb0 bsp=e0000000047f9308
[<a000000100011540>] ia64_leave_kernel+0x0/0x260
sp=e0000000047ffbb0 bsp=e0000000047f9308
[<a0000001000177c0>] ia64_pal_call_static+0x80/0xa0
sp=e0000000047ffd80 bsp=e0000000047f9000
[<a000000100018e30>] default_idle+0x90/0x140
sp=e0000000047ffd80 bsp=e0000000047f8fd8
[<a000000100019000>] cpu_idle+0x120/0x1e0
sp=e0000000047ffe20 bsp=e0000000047f8f78
[<a000000100008d30>] rest_init+0x90/0xe0
sp=e0000000047ffe20 bsp=e0000000047f8f60
[<a0000001007c4e10>] start_kernel+0x490/0x520
sp=e0000000047ffe20 bsp=e0000000047f8f00
[<a0000001000081a0>] _start+0x280/0x2a0
sp=e0000000047ffe30 bsp=e0000000047f8e90
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--
Aron Griffis
hp Linux and Open Source Lab
Key fingerprint = 4601 AE87 379D A917 BA62 5263 C284 0366 5E6A 3C6B

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