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Date: Tue, 27 Jul 2004 22:52:50 -0400
From: Brian Fundakowski Feldman <green@freebsd.org>
To: Randy Bush <randy@psg.com>
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cc: FreeBSD Current <freebsd-current@freebsd.org>
cc: Garance A Drosihn <drosih@rpi.edu>
Subject: Re: Anyone Else Seeing: Assertion td->td_turnstile
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On Tue, Jul 27, 2004 at 11:35:28AM -1000, Randy Bush wrote:
> oh, and with an unassertive kernel, i get a similar hard crash
> 
> kernel trap 12 with interrupts disabled
> 
> 
> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0x10
> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xc04dce1c
> stack pointer           = 0x10:0xdf021ae0
> frame pointer           = 0x10:0xdf021b00
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = resume, IOPL = 0
> current process         = 830 (mysqld)
> [thread 100261]
> Stopped at      turnstile_wait+0x20c:   movl    %eax,0x10(%edx)
> db> trace
> turnstile_wait(c23f8ac0,c0644b80,c22e8420,4,c2822b00) at turnstile_wait+0x20c
> _mtx_lock_sleep(c0644b80,0,0,0,1) at _mtx_lock_sleep+0xd5
> cv_wait_sig(c064a004,c0649fe0,df021b8c,4,4) at cv_wait_sig+0x29e
> kern_select(c2822b00,4,bfbfed10,0,0) at kern_select+0x688
> select(c2822b00,df021d14,14,6,5) at select+0x66
> syscall(835002f,2f,835002f,835b000,0) at syscall+0x320
> Xint0x80_syscall() at Xint0x80_syscall+0x1f
> --- syscall (93, FreeBSD ELF32, select), eip = 0x284e3fbf, esp = 0xbfbfe8bc, ebp = 0xbfbfe8f8 ---

Stability is amazingly improved after removing PREEMPTION.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\