I got this crash while hunting some other bug. dualcore 970mp.
Welcome to SUSE Linux Enterprise Server 9.90 Beta7 (ppc) - Kernel 2.6.16-rc5-git
14-ppc64-defconfig (console).
wels login: BUG: spinlock bad magic on CPU#1, gdm/4568
cpu 0x1: Vector: 300 (Data Access) at [c0000000f3c2f5c0]
pc: c00000000020a7ec: .spin_bug+0x94/0x100
lr: c00000000020a7cc: .spin_bug+0x74/0x100
sp: c0000000f3c2f840
msr: 8000000000009032
dar: ffff000000000104
dsisr: 40000000
current = 0xc0000000f916e040
paca = 0xc0000000005ddd00
pid = 4568, comm = gdm
enter ? for help
1:mon> t
[c0000000f3c2f8d0] c00000000020aa64 ._raw_spin_lock+0x40/0x164
[c0000000f3c2f960] c00000000048bff4 ._spin_lock+0x10/0x24
[c0000000f3c2f9e0] c0000000000a28b0 .anon_vma_link+0x30/0x74
[c0000000f3c2fa70] c00000000005540c .dup_mm+0x244/0x4a8
[c0000000f3c2fb40] c00000000005658c .copy_process+0x930/0xff4
[c0000000f3c2fcb0] c000000000056d34 .do_fork+0xe4/0x244
[c0000000f3c2fdc0] c00000000000f440 .sys_clone+0x5c/0x74
[c0000000f3c2fe30] c000000000008950 .ppc_clone+0x8/0xc
--- Exception: c00 (System Call) at 000000000f202918
SP (ff829160) is in userspace
1:mon>
This kernel was booted serveral times.
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