Date: Mon, 26 Oct 2009 09:09:06 -0500 From: Jaime Bozza <jbozza@mindsites.com> To: Kostik Belousov <kostikbel@gmail.com>, Dylan Cochran <heliocentric@gmail.com> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: RE: Possible scheduler (SCHED_ULE) bug? Message-ID: <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A95@ATLAS.msg.local> In-Reply-To: <20091023212104.GH2160@deviant.kiev.zoral.com.ua> References: <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A85@ATLAS.msg.local> <bdf82f800910231328tfa4decfncd70ae0daad2bef6@mail.gmail.com> <20091023212104.GH2160@deviant.kiev.zoral.com.ua>
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From: Kostik Belousov [mailto:kostikbel@gmail.com]
> Can you look up the source line for kern_sendfile+0x90d in your
> kernel ? Do kgdb kernel.debug, then execute "list *(kern_sendfile+0x90d)".
In my case, it was kern_sendfile+0x6ad (rebuilt with RELENG_7 this weekend).
Here's the output:
(kgdb) list *(kern_sendfile+0x6ad)
0xc0855fdd is in kern_sendfile (atomic.h:160).
155 static __inline int
156 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
157 {
158 u_char res;
159
160 __asm __volatile(
161 " " MPLOCKED " "
162 " cmpxchgl %2,%1 ; "
163 " sete %0 ; "
164 "1: "
Not much to go on there. I posted a backtrace in a previous email, but the relevant sections (I think) are:
#14 0xc0855fdd in kern_sendfile (td=0xc771db40, uap=0xc72e2cfc, hdr_uio=0x0, trl_uio=0x0, compat=0) at atomic.h:160
#15 0xc0856d31 in do_sendfile (td=0xc771db40, uap=0xc72e2cfc, compat=0) at /usr/src/sys/kern/uipc_syscalls.c:1775
#16 0xc0856dd3 in sendfile (td=0xc771db40, uap=0xc72e2cfc) at /usr/src/sys/kern/uipc_syscalls.c:1746
#17 0xc0b01365 in syscall (frame=0xc72e2d38) at /usr/src/sys/i386/i386/trap.c:1094
#18 0xc0ae5960 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:262
#19 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
I'm still going to test the specific boundary, but if there's more information I can give, let me know!
Jaime
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