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<p class=MsoNormal>Hi All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have reached a deadlock caused by the fact that the
function __free_mads takes h_al->mad_lock<o:p></o:p></p>
<p class=MsoNormal>It then calls ib_put_mad which calls al_remove_mad that will
try to take the same lock.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Please see the call stack.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Child-SP
RetAddr Call Site<o:p></o:p></p>
<p class=MsoNormal>fffff880`021c9fd0 fffff800`01687a3f
nt!KxWaitForSpinLockAndAcquire+0x20<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca000 fffff880`07cc775e
nt!KeAcquireSpinLockAtDpcLevel+0x6f<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca050 fffff880`07d0ef5c
ibbus!cl_spinlock_acquire+0x5e [b:\users\tzachid\projinf5\trunk\inc\kernel\complib\cl_spinlock_osd.h
@ 96]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca090 fffff880`07d30c5e ibbus!al_remove_mad+0x2c
[b:\users\tzachid\projinf5\trunk\core\al\al.c @ 245]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca0d0 fffff880`07d0e5ed ibbus!ib_put_mad+0x23e
[b:\users\tzachid\projinf5\trunk\core\al\kernel\al_mad_pool.c @ 923]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca110 fffff880`07d0e814 ibbus!__free_mads+0x8d
[b:\users\tzachid\projinf5\trunk\core\al\al.c @ 143]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca160 fffff880`07d63131 ibbus!free_al+0x54
[b:\users\tzachid\projinf5\trunk\core\al\al.c @ 168]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca1a0 fffff880`07d61f67
ibbus!async_destroy_cb+0x7f1
[b:\users\tzachid\projinf5\trunk\core\al\al_common.c @ 842]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca210 fffff880`07d62820
ibbus!sync_destroy_obj+0x6a7
[b:\users\tzachid\projinf5\trunk\core\al\al_common.c @ 704]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca280 fffff880`07d61976 ibbus!destroy_obj+0x820
[b:\users\tzachid\projinf5\trunk\core\al\al_common.c @ 774]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca2f0 fffff880`07cdbf3e
ibbus!sync_destroy_obj+0xb6
[b:\users\tzachid\projinf5\trunk\core\al\al_common.c @ 633]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca360 fffff880`07ca93ef ibbus!al_cleanup+0x3fe
[b:\users\tzachid\projinf5\trunk\core\al\al_init.c @ 146]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca3c0 fffff880`07cce977
ibbus!fdo_release_resources+0x7af
[b:\users\tzachid\projinf5\trunk\core\bus\kernel\bus_pnp.c @ 715]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca440 fffff880`07cce7ad ibbus!cl_do_remove+0x127
[b:\users\tzachid\projinf5\trunk\core\complib\kernel\cl_pnp_po.c @ 680]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca480 fffff880`07cc9e20 ibbus!__remove+0x15d
[b:\users\tzachid\projinf5\trunk\core\complib\kernel\cl_pnp_po.c @ 648]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca4d0 fffff880`00c7093c ibbus!cl_pnp+0x1410
[b:\users\tzachid\projinf5\trunk\core\complib\kernel\cl_pnp_po.c @ 243]<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca5c0 fffff880`00c692ce
Wdf01000!FxPkgFdo::ProcessRemoveDeviceOverload+0x74<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca5f0 fffff880`00c67dd6
Wdf01000!FxPkgPnp::_PnpRemoveDevice+0x126<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca660 fffff880`00c37245
Wdf01000!FxPkgPnp::Dispatch+0x1b2<o:p></o:p></p>
<p class=MsoNormal>fffff880`021ca6d0 fffff880`00c3714b
Wdf01000!FxDevice::Dispatch+0xa9<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It seems to me, that the best way to solve this issue
(without doing revolutions in the code) is to create a new version of ib_put_mad
that will be called ib_put_mad_locked that will call al_remove_mad_locked (a
new function as well) that will not take the lock again.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone has objections or a better way to fix the issue?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal>Tzachi<o:p></o:p></p>
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