Date: Fri, 24 Feb 2012 16:29:40 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Bengt Ahlgren <bengta@sics.se> Cc: emulation@freebsd.org Subject: Re: [Bengt Ahlgren] 8.3-PRERELEASE panic in linux emulation Message-ID: <20120224142940.GR55074@deviant.kiev.zoral.com.ua> In-Reply-To: <uh762ewxvpv.fsf@P142.sics.se> References: <uh762ewxvpv.fsf@P142.sics.se>
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--cycRQitB/3DOnQyb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Feb 24, 2012 at 01:27:24PM +0100, Bengt Ahlgren wrote: > Hello! >=20 > Perhaps emulation@ is a better place to report this problem? >=20 > Bengt >=20 > From: Bengt Ahlgren <bengta@sics.se> > To: stable@freebsd.org > Subject: 8.3-PRERELEASE panic in linux emulation > Date: Thu, 23 Feb 2012 17:26:32 +0100 >=20 > Hi! >=20 > I get a consistent panic when starting acroread after updating to > 8.3-PRERELEASE. An 8.2-STABLE from Feb 4th was OK. Can provide more > info if needed. >=20 > Bengt >=20 > FreeBSD xx.yy.zz 8.3-PRERELEASE FreeBSD 8.3-PRERELEASE #13 r231999: Wed F= eb 22 21:01:38 CET 2012 bengta@P142.sics.se:/usr/obj/usr/src/sys/P142-8= 2 i386 >=20 > Fatal trap 12: page fault while in kernel mode > fault virtual address =3D 0xbfbfdffc > fault code =3D supervisor write, page not present > instruction pointer =3D 0x20:0xc50b396c > stack pointer =3D 0x28:0xe7481a6c > frame pointer =3D 0x28:0xe7481a90 > code segment =3D base 0x0, limit 0xfffff, type 0x1b > =3D DPL 0, pres 1, def32 1, gran 1 > processor eflags =3D interrupt enabled, resume, IOPL =3D 0 > current process =3D 1997 (bash) > trap number =3D 12 > panic: page fault > KDB: stack backtrace: > db_trace_self_wrapper(c091af2a,70797420,78302065,a0d6231,c5d6b600,...) at= db_trace_self_wrapper+0x26 > kdb_backtrace(c0919061,c09b49a0,c0900251,e7481910,e7481910,...) at kdb_ba= cktrace+0x2a > panic(c0900251,c0941cab,c5c246e8,1,1,...) at panic+0xaf > trap_fatal(c0670d02,0,e7481964,80400,c5c24580,...) at trap_fatal+0x353 > trap_pfault(e74819cc,bfbfe190,c5c24580,202,c5cecac0,...) at trap_pfault+0= x87 > trap(e7481a2c) at trap+0x453 > calltrap() at calltrap+0x6 > --- trap 0xc, eip =3D 0xc50b396c, esp =3D 0xe7481a6c, ebp =3D 0xe7481a90 = --- > elf_linux_fixup(e7481c0c,e7481b98,c065ca92,c60ffce8,100000,...) at elf_li= nux_fixup+0x33c > kern_execve(c5c24580,e7481c3c,0,8112710,8116cd8,...) at kern_execve+0x7d6 > linux_execve(c5c24580,e7481cec,c,c,c,...) at linux_execve+0xa7 > syscall(e7481d28) at syscall+0x372 > Xint0x80_syscall() at Xint0x80_syscall+0x21 > --- syscall (11, Linux ELF, linux_execve), eip =3D 0x281e0d4a, esp =3D 0x= bfbfd644, ebp =3D 0xbfbfd7e8 --- >=20 > #0 doadump () at pcpu.h:244 > #1 0xc05de609 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c= :441 > #2 0xc05de84f in panic (fmt=3DVariable "fmt" is not available. > ) at /usr/src/sys/kern/kern_shutdown.c:614 > #3 0xc08b22c3 in trap_fatal (frame=3D0xe7481a2c, eva=3D3217022972) at /u= sr/src/sys/i386/i386/trap.c:981 > #4 0xc08b2357 in trap_pfault (frame=3D0xe7481a2c, usermode=3D0, eva=3D32= 17022972) at /usr/src/sys/i386/i386/trap.c:843 > #5 0xc08b3133 in trap (frame=3D0xe7481a2c) at /usr/src/sys/i386/i386/tra= p.c:562 > #6 0xc089bedc in calltrap () at /usr/src/sys/i386/i386/exception.s:168 > #7 0xc50b396c in elf_linux_fixup (stack_base=3D0xe7481c0c, imgp=3D0xe748= 1b98) at /usr/src/sys/modules/linux/../../i386/linux/linux_sysvec.c:288 > #8 0xc05ac636 in kern_execve (td=3D0xc5c24580, args=3D0xe7481c3c, mac_p= =3D0x0) at /usr/src/sys/kern/kern_exec.c:551 > #9 0xc50ab387 in linux_execve (td=3D0xc5c24580, args=3D0xe7481cec) at /u= sr/src/sys/modules/linux/../../i386/linux/linux_machdep.c:143 > #10 0xc08b2902 in syscall (frame=3D0xe7481d28) at subr_syscall.c:114 > #11 0xc089bf41 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception= .s:266 > #12 0x00000033 in ?? () >=20 I am not sure if this is the real cause of your panic, but the line from the backtrace indeed has a bug. Please try the change below. diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c index 7634138..d4e23e1 100644 --- a/sys/i386/linux/linux_sysvec.c +++ b/sys/i386/linux/linux_sysvec.c @@ -227,11 +227,11 @@ linux_fixup(register_t **stack_base, struct image_par= ams *imgp) argv =3D *stack_base; envp =3D *stack_base + (imgp->args->argc + 1); (*stack_base)--; - **stack_base =3D (intptr_t)(void *)envp; + suword(*stack_base, (intptr_t)(void *)envp); (*stack_base)--; - **stack_base =3D (intptr_t)(void *)argv; + suword(*stack_base, (intptr_t)(void *)argv); (*stack_base)--; - **stack_base =3D imgp->args->argc; + suword(*stack_base, imgp->args->argc); return (0); } =20 @@ -286,7 +286,7 @@ elf_linux_fixup(register_t **stack_base, struct image_p= arams *imgp) imgp->auxargs =3D NULL; =20 (*stack_base)--; - **stack_base =3D (register_t)imgp->args->argc; + suword(*stack_base, (register_t)imgp->args->argc); return (0); } =20 --cycRQitB/3DOnQyb Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk9HntMACgkQC3+MBN1Mb4jbhgCgrqZVU6oOBIjEtwlLtDsqMJ9r xvYAoK8n8ICvdpl6yB4+DUjJMoU2L+1S =YcYj -----END PGP SIGNATURE----- --cycRQitB/3DOnQyb--
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