Date: Wed, 17 Jan 2007 10:15:30 +0100 From: Divacky Roman <xdivac02@stud.fit.vutbr.cz> To: Scot Hetzel <swhetzel@gmail.com> Cc: emulation@freebsd.org, Alexander Leidinger <Alexander@leidinger.net> Subject: Re: linuxolator: fatal trap 12 when compiling libX11 Message-ID: <20070117091530.GA48578@stud.fit.vutbr.cz> In-Reply-To: <790a9fff0701162000s5f48d51fk2e5a4a74bd7021f9@mail.gmail.com> References: <790a9fff0701151314x6dd48ecbg90a54729813e84e@mail.gmail.com> <20070116080015.8dus0vamssso0sww@webmail.leidinger.net> <790a9fff0701161005t75222f2l439e8c0c1153ffd2@mail.gmail.com> <20070116181839.GA80994@stud.fit.vutbr.cz> <790a9fff0701161317q74b28955jf61b6e9651168a36@mail.gmail.com> <20070116221150.GA9429@stud.fit.vutbr.cz> <790a9fff0701162000s5f48d51fk2e5a4a74bd7021f9@mail.gmail.com>
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On Tue, Jan 16, 2007 at 10:00:21PM -0600, Scot Hetzel wrote:
> On 1/16/07, Divacky Roman <xdivac02@stud.fit.vutbr.cz> wrote:
> >please test this patch:
> >
> >Index: linux_emul.c
> >===================================================================
> >RCS file: /home/ncvs/src/sys/compat/linux/linux_emul.c,v
> >retrieving revision 1.12
> >diff -u -r1.12 linux_emul.c
> >--- linux_emul.c 7 Jan 2007 19:09:20 -0000 1.12
> >+++ linux_emul.c 16 Jan 2007 22:11:06 -0000
> >@@ -170,7 +170,8 @@
> > EMUL_UNLOCK(&emul_lock);
> >
> > EMUL_SHARED_WLOCK(&emul_shared_lock);
> >- LIST_REMOVE(em, threads);
> >+ if (!LIST_EMPTY(em->shared->threads)
>
> Wouldn't compile as shown above (complained about '->' when
> compiling), changed it to:
>
> if (!LIST_EMPTY(&em->shared->threads))
>
> but now I'm getting:
>
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 0; apic id = 00
> instruction pointer = 0x8:0xffffffffa2cb3b2c
> stack pointer = 0x10:0xffffffffa3135ad0
> frame pointer = 0x10:0xffffffffa3135b10
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 20225 (bash)
> panic: from debugger
> cpuid = 0
> Uptime: 9m59s
> Physical memory: 1008 MB
>
> (kgdb) list *0xffffffffa2cb3b2c
> 0xffffffffa2cb3b2c is in linux_proc_init
> (/usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:138).
> 133 }
> 134 }
> 135 if (child != 0) {
> 136 EMUL_UNLOCK(&emul_lock);
> 137 EMUL_SHARED_WLOCK(&emul_shared_lock);
> 138 LIST_INSERT_HEAD(&em->shared->threads, em, threads);
> 139 EMUL_SHARED_WUNLOCK(&emul_shared_lock);
> 140
> 141 p = pfind(child);
> 142 /* we might have a sleeping linux_schedtail */
> (kgdb) bt
> #0 doadump () at pcpu.h:172
> During symbol reading, Incomplete CFI data; unspecified registers at
> 0xffffffff80445bbc.
> #1 0xffffffff804464b9 in boot (howto=0x104) at
> ../../../kern/kern_shutdown.c:411
> #2 0xffffffff80445f47 in panic (fmt=0xffffffff806a82a7 "from
> debugger") at ../../../kern/kern_shutdown.c:567
> #3 0xffffffff801ac8c7 in db_panic (addr=0x0, have_addr=0x0,
> count=0x0, modif=0x0) at ../../../ddb/db_command.c:433
> #4 0xffffffff801acd69 in db_command_loop () at
> ../../../ddb/db_command.c:401
> #5 0xffffffff801aec73 in db_trap (type=0xa3135830, code=0x0) at
> ../../../ddb/db_main.c:222
> #6 0xffffffff8046c428 in kdb_trap (type=0x9, code=0x0,
> tf=0xffffffffa3135a20) at ../../../kern/subr_kdb.c:502
> #7 0xffffffff80654f41 in trap_fatal (frame=0xffffffffa3135a20,
> eva=0xffffff002d1d9290)
> at ../../../amd64/amd64/trap.c:691
> #8 0xffffffff8065551a in trap (frame=0xffffffffa3135a20) at
> ../../../amd64/amd64/trap.c:499
> #9 0xffffffff8063d39e in calltrap () at
> ../../../amd64/amd64/exception.S:169
> #10 0xffffffffa2cb3b2c in linux_proc_init (td=0xffffff002d1d9290,
> child=0x4f5c, flags=0x0)
> at /usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:138
> #11 0xffffffffa2cbb810 in linux_fork (td=0xffffff002d1d9290, args=0x0)
> at
> /usr/src/7x/sys-orig/modules/linux/../../amd64/linux32/linux32_machdep.c:467
> #12 0xffffffff8068e0a0 in ia32_syscall (frame=0xffffffffa3135c80) at
> ../../../amd64/ia32/ia32_syscall.c:187
> #13 0xffffffff8063d780 in Xint0x80_syscall () at ia32_exception.S:65
> #14 0x0000000028192358 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> (kgdb) frame 10
> #10 0xffffffffa2cb3b2c in linux_proc_init (td=0xffffff002d1d9290,
> child=0x4f5c, flags=0x0)
> at /usr/src/7x/sys-orig/modules/linux/../../compat/linux/linux_emul.c:138
> 138 LIST_INSERT_HEAD(&em->shared->threads, em, threads);
> (kgdb) p &em->shared->threads
> $1 = (struct {...} *) 0xdeadc0dedeadc0e6
> (kgdb) p *em
> $3 = {
> pid = 0xdeadc0de,
> child_set_tid = 0x0,
> child_clear_tid = 0x0,
> shared = 0xdeadc0dedeadc0de,
> pdeath_signal = 0xdeadc0de,
> threads = {
> le_next = 0xdeadc0dedeadc0de,
> le_prev = 0xdeadc0dedeadc0de
> }
> }
scot, please test this patch and report me what it prints out
just before the panic, btw.. your machine is SMP?
thnx
Index: linux_emul.c
===================================================================
RCS file: /home/ncvs/src/sys/compat/linux/linux_emul.c,v
retrieving revision 1.12
diff -u -r1.12 linux_emul.c
--- linux_emul.c 7 Jan 2007 19:09:20 -0000 1.12
+++ linux_emul.c 17 Jan 2007 09:13:08 -0000
@@ -133,8 +133,11 @@
}
}
if (child != 0) {
+ printf("before: %p\n", em->shared);
EMUL_UNLOCK(&emul_lock);
+ printf("after1: %p\n", em->shared);
EMUL_SHARED_WLOCK(&emul_shared_lock);
+ printf("after2: %p\n", em->shared);
LIST_INSERT_HEAD(&em->shared->threads, em, threads);
EMUL_SHARED_WUNLOCK(&emul_shared_lock);
@@ -170,7 +173,8 @@
EMUL_UNLOCK(&emul_lock);
EMUL_SHARED_WLOCK(&emul_shared_lock);
- LIST_REMOVE(em, threads);
+ if (!LIST_EMPTY(&em->shared->threads))
+ LIST_REMOVE(em, threads);
PROC_LOCK(p);
p->p_emuldata = NULL;
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