[uml-devel] wait queues broken?

[uml-devel] wait queues broken?

[sean whalen]

Hi All --
Has anyone had any problems with wait queues in 2.6.0-test9 under UML?  
I have the following in my code:

wait_queue_head_t wq;
init_waitqueue_head(&wq);
interruptible_sleep_on_timeout(&wq, 5*HZ);

And the UML kernel dies when it reaches the  
interruptible_sleep_on_timeout.
Here is a gdb trace:

Program received signal SIGSEGV, Segmentation fault.
schedule () at kernel/sched.c:327
327             array->nr_active--;
(gdb) bt
#0  schedule () at kernel/sched.c:327
#1  0xa004394f in schedule_timeout (timeout=-1608944988) at kernel/ 
timer.c:1046
#2  0xa0031eab in interruptible_sleep_on_timeout (q=0xa0197354,  
timeout=500)
    at kernel/sched.c:1792
#3  0xa016c42a in wait_for_response () at net/bridge/br_stp_bpdu.c:159
#4  0xa016c63e in br_stp_handle_bpdu (skb=0x1) at net/bridge/ 
br_stp_bpdu.c:240
#5  0xa016a28f in br_handle_frame (skb=0xa1fd56ec) at net/bridge/ 
br_input.c:136
#6  0xa0118492 in netif_receive_skb (skb=0xa1fd56ec) at net/core/dev. 
c:1522
#7  0xa0118637 in process_backlog (backlog_dev=0xa01c5a48,  
budget=0xa019748c)
    at net/core/dev.c:1611
#8  0xa0118746 in net_rx_action (h=0xa01bcd78) at net/core/dev.c:1676
#9  0xa003abfa in do_softirq () at kernel/softirq.c:98
#10 0xa0014fdb in do_IRQ (irq=5, regs=0xa0198e90) at arch/um/kernel/ 
irq.c:340
#11 0xa00159da in sigio_handler () at wait.h:60
#12 0xa0022551 in sig_handler_common_skas () at wait.h:60
#13 0xa001fc58 in sig_handler () at wait.h:60
#14 <signal handler called>
#15 0x400b0e64 in setitimer () from /lib/libc.so.6
#16 0xa001ea1b in switch_timers () at wait.h:60
#17 0xa0197854 in init_thread_union ()
(gdb) display array
1: array = (prio_array_t *) 0x0

So array is a null pointer being dereferenced in sched.c.  Am I doing  
something stupid, could this possibly be a UML bug, or should I forward  
to lkml?  Any help is appreciated.

Thanks,
	-Sean


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