Sorry for the confusion of deadlock and Oops. I'm not that familiar with the terms...
here is the disassemble output of gdb:
..... 0x00000f95 <qh_completions+210>: lock addl $0x0,0x0(%esp,1) 0x00000f9b <qh_completions+216>: mov 0x8(%esi),%ebx 0x00000f9e <qh_completions+219>: test %bl,%bl 0x00000fa0 <qh_completions+221>: js 0x11be <qh_completions+763> 0x00000fa6 <qh_completions+227>: test $0x40,%bl 0x00000fa9 <qh_completions+230>: je 0x116e <qh_completions+683> 0x00000faf <qh_completions+236>: movl $0x1,0xffffffe4(%ebp) 0x00000fb6 <qh_completions+243>: mov 0xffffffd0(%ebp),%eax 0x00000fb9 <qh_completions+246>: addl $0x1,0x14(%eax) 0x00000fbd <qh_completions+250>: xor %eax,%eax 0x00000fbf <qh_completions+252>: xchg %al,(%edi) 0x00000fc1 <qh_completions+254>: test %al,%al 0x00000fc3 <qh_completions+256>: jle 0x1161 <qh_completions+670> 0x00000fc9 <qh_completions+262>: mov %ebx,0xc(%esp,1) 0x00000fcd <qh_completions+266>: mov 0x8(%ebp),%edx 0x00000fd0 <qh_completions+269>: mov 0x44(%esi),%eax 0x00000fd3 <qh_completions+272>: mov %edx,(%esp,1) 0x00000fd6 <qh_completions+275>: mov %edi,0x4(%esp,1) 0x00000fda <qh_completions+279>: mov %eax,0x8(%esp,1) 0x00000fde <qh_completions+283>: call 0xc24 <qtd_copy_status> 0x00000fe3 <qh_completions+288>: movl $0x0,0xffffffdc(%ebp) 0x00000fea <qh_completions+295>: cmpl $0xffffff87,0x24(%edi) 0x00000fee <qh_completions+299>: je 0x1147 <qh_completions+644> 0x00000ff4 <qh_completions+305>: cmpl $0xdead4ead,0x4(%edi) 0x00000ffb <qh_completions+312>: jne 0x113a <qh_completions+631> 0x00001001 <qh_completions+318>: movzbl (%edi),%eax 0x00001004 <qh_completions+321>: test %al,%al 0x00001006 <qh_completions+323>: jg 0x112d <qh_completions+618> 0x0000100c <qh_completions+329>: movb $0x1,(%edi) 0x0000100f <qh_completions+332>: mov 0xffffffd0(%ebp),%ecx 0x00001012 <qh_completions+335>: mov 0x8(%ecx),%eax 0x00001015 <qh_completions+338>: subl $0x1,0x14(%ecx) 0x00001019 <qh_completions+342>: test $0x8,%al 0x0000101b <qh_completions+344>: jne 0x1123 <qh_completions+608> 0x00001021 <qh_completions+350>: mov 0xffffffe4(%ebp),%eax ------------- that's the spot (0x162/0x35d) 0x00001024 <qh_completions+353>: test %eax,%eax ------------- 0x00001026 <qh_completions+355>: je 0x1035 <qh_completions+370> 0x00001028 <qh_completions+357>: mov 0x3c(%esi),%edx 0x0000102b <qh_completions+360>: cmp 0xffffffd4(%ebp),%edx 0x0000102e <qh_completions+363>: je 0x1035 <qh_completions+370> 0x00001030 <qh_completions+365>: mov (%esi),%eax 0x00001032 <qh_completions+367>: mov %eax,0xffffffc8(%edx) 0x00001035 <qh_completions+370>: lea 0x38(%esi),%ecx 0x00001038 <qh_completions+373>: mov 0x38(%esi),%eax 0x0000103b <qh_completions+376>: mov 0x4(%ecx),%edx 0x0000103e <qh_completions+379>: mov %edx,0x4(%eax) 0x00001041 <qh_completions+382>: mov %eax,(%edx) 0x00001043 <qh_completions+384>: movl $0x200200,0x4(%ecx) 0x0000104a <qh_completions+391>: movl $0x100100,0x38(%esi) 0x00001051 <qh_completions+398>: mov %esi,0xfffffff0(%ebp) 0x00001054 <qh_completions+401>: mov 0xffffffe8(%ebp),%eax 0x00001057 <qh_completions+404>: mov (%eax),%edx 0x00001059 <qh_completions+406>: cmp 0xffffffd4(%ebp),%eax 0x0000105c <qh_completions+409>: mov %edx,0xffffffe8(%ebp) 0x0000105f <qh_completions+412>: jne 0xf34 <qh_completions+113> 0x00001065 <qh_completions+418>: mov 0xfffffff0(%ebp),%eax 0x00001068 <qh_completions+421>: test %eax,%eax .....
This seems to be somewhere in this part of the code:
.....
/* remove it from the queue */
spin_lock (&urb->lock);
qtd_copy_status (ehci, urb, qtd->length, token);
do_status = (urb->status == -EREMOTEIO)
&& usb_pipecontrol (urb->pipe);
spin_unlock (&urb->lock);if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
last = list_entry (qtd->qtd_list.prev,
struct ehci_qtd, qtd_list);
last->hw_next = qtd->hw_next;
}
list_del (&qtd->qtd_list);
last = qtd;
....
Andreas
David Brownell wrote:
Hi Andreas,
These aren't really examples of a "deadlock", they're just oopses. Can you disassemble the qh_completions() code and find out what it's trying to execute when it oopses? Either GDB or "objdump" can be used.
This is a new one, but at least it looks like it's the same spot in the code each time ... so maybe it's simple. I've not done as much SMP testing with EHCI as I'd like.
- Dave
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