Date: Tue, 24 Aug 1999 00:37:49 -0500 From: Alan Cox <alc@cs.rice.edu> To: Doug Rabson <dfr@nlsystems.com> Cc: stable@freebsd.org Subject: Re: mSQL getting stuck in objtrm state (fwd) Message-ID: <19990824003749.C28920@cs.rice.edu> In-Reply-To: <Pine.BSF.4.10.9908232146340.72739-100000@salmon.nlsystems.com>; from Doug Rabson on Mon, Aug 23, 1999 at 09:48:48PM %2B0100 References: <Pine.BSF.4.10.9908232146340.72739-100000@salmon.nlsystems.com>
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I found the following "smoking gun" in the code generated
for the vm_object_pip_subtract (atomic_subtract_short)
in swap_pager_iodone:
} else {
vm_object_pip_subtract(object, spc->spc_count);
if ((object->paging_in_progress == 0) &&
translates to ...
0xc01d5a96 <swap_pager_iodone+138>:
jmp 0xc01d5af6 <swap_pager_iodone+234>
0xc01d5a98 <swap_pager_iodone+140>: movw 0x3c(%edx),%ax
0xc01d5a9c <swap_pager_iodone+144>: subw 0x1c(%ebx),%ax
0xc01d5aa0 <swap_pager_iodone+148>: movw %ax,0x3c(%edx)
0xc01d5aa4 <swap_pager_iodone+152>:
jne 0xc01d5ab9 <swap_pager_iodone+173>
I'm looking into backporting -CURRENT's atomic.h now.
Alan
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