On Friday 16 December 2005 12:37 pm, Anish Mistry wrote: > Here is the offending program/code. The interesting program is > avidemux_2.1_branch_anish/avidemux/avidemux2. > (It is compiled for CURRENT, and I left all the object code stuff in > so it's a bit large 21MB) > http://am-productions.biz/docs/avidemux_2.1_branch_anish.tgz > > First you'll need to compile spidermonkey to be threadsafe so add the > following to your lang/spidermonkey/Makefile before installing it: > LIB_DEPENDS= nspr4.1:${PORTSDIR}/devel/nspr > MAKE_ARGS+= JS_THREADSAFE=YES LDFLAGS="-L${LOCALBASE}/lib > -lpthread -lm" > CFLAGS+= -I${LOCALBASE}/include/nspr > > Once a threadsafe spidermonkey is installed to kill the machine you'll > need to: > cd avidemux_2.1_branch_anish/avidemux > ./avidemux2 --run new-features-test.js > > On CURRENT: > kernel trap 12 with interrupts disabled > > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0x68 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc04e6f36 > stack pointer = 0x28:0xcc9edb3c > frame pointer = 0x28:0xcc9edbb0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = resume, IOPL = 0 > current process = 798 (gdb) > trap number = 12 > panic: page fault > > #0 doadump () at pcpu.h:165 > #1 0xc04bb7eb in boot (howto=260) > at /usr/src/sys/kern/kern_shutdown.c:399 > #2 0xc04bb353 in panic (fmt=0xc06069a7 "%s") > at /usr/src/sys/kern/kern_shutdown.c:555 > #3 0xc05e91ba in trap_fatal (frame=0xcc9edafc, eva=104) > at /usr/src/sys/i386/i386/trap.c:862 > #4 0xc05e96d9 in trap (frame= > {tf_fs = 8, tf_es = 40, tf_ds = 40, tf_edi = -1032878460, tf_esi > = 1, tf_ebp = -862004304, tf_isp = -862004440, tf_ebx = -1033297504, > tf_edx = -1033987232, tf_ecx = 4, tf_eax = 0, tf_trapno = 12, tf_err > = 0, tf_eip = -1068601546, tf_cs = 32, tf_eflags = 65687, tf_esp = > -1032878356, tf_ss = -1067380424}) > at /usr/src/sys/i386/i386/trap.c:273 > #5 0xc05db6fa in calltrap () > at /usr/src/sys/i386/i386/exception.s:137 > #6 0xc04e6f36 in kern_ptrace (td=0xc25e9b60, req=10, pid=1, addr=0x0, > data=17) > at /usr/src/sys/kern/sys_process.c:802 On HEAD this is: p->p_xthread->td_flags &= ~TDF_XSIG; If two threads called kern_ptrace() with the same PID and this could happen. Hmm, I have no idea how p_xthread is supposed to not be racey here in fact. It would be helpful to know what PTRACE action it it is trying to do and maybe a KTR trace of the various ptrace events leading up to this condition. I have no idea what thread you are supposed to act on if p_xthread is NULL either. > #7 0xc04e71f0 in ptrace (td=0xc25e9b60, uap=0xcc9edd04) > at /usr/src/sys/kern/sys_process.c:433 > #8 0xc05e9ca6 in syscall (frame= > {tf_fs = 59, tf_es = 59, tf_ds = 59, tf_edi = 136221752, tf_esi > = 796, tf_ebp = -1077943184, tf_isp = -862003868, tf_ebx = 796, > tf_edx = 674587084, tf_ecx = 674505768, tf_eax = 26, tf_trapno = 12, > tf_err = 2, tf_eip = 673978987, tf_cs = 51, tf_eflags = 518, tf_esp = > -1077943208, tf_ss = 59}) > at /usr/src/sys/i386/i386/trap.c:1008 > ---Type <return> to continue, or q <return> to quit--- > #9 0xc05db74f in Xint0x80_syscall () > at /usr/src/sys/i386/i386/exception.s:190 > #10 0x00000033 in ?? () > > > http://am-productions.biz/docs/littleguy-dmesg.gz > http://am-productions.biz/docs/littleguy-pciconf.gz > > > > From my previous email to questions with the info on 6.0-RELEASE: > I'm getting the following panic, which I can reproduce easily. Let me > know what other information I should provide. The backtrace seems > really short for some reason. I get the panic when running a > multi-threaded application I'm developing/modifying. > > kernel trap 12 with interrupts disabled > > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0x48 > fault code = supervisor write, page not present > instruction pointer = 0x20:0xc0510cb3 > stack pointer = 0x28:0xe9aebb74 > frame pointer = 0x28:0xe9aebbf8 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = resume, IOPL = 0 > current process = 7848 (gdb) > [thread pid 7848 tid 100184 ] > Stopped at kern_ptrace+0x11e3: andl $0xfffbffff,0x48(%eax) > db> bt > Tracing pid 7848 tid 100184 td 0xc4302180 > kern_ptrace(c4302180,a,1ea6,0,11) at kern_ptrace+0x11e3 > ptrace(c4302180,e9aebd04,10,418,4) at ptrace+0x56 > syscall(3b,3b,3b,bfbfe580,1ea6) at syscall+0x13d > Xint0x80_syscall() at Xint0x80_syscall+0x1f > --- syscall (26, FreeBSD ELF32, ptrace), eip = 0x283360e7, esp = > 0xbfbfe3bc, ebp > = 0xbfbfe3d8 --- > > > > Full panic and backtrace, and alltrace: > http://am-productions.biz/docs/bigguy-panic.gz > http://am-productions.biz/docs/bigguy-dmesg.gz > http://am-productions.biz/docs/bigguy-pciconf.gz > Kernel config: > http://am-productions.biz/docs/BIGGUY.gz > > > I have firewire console access to the CURRENT system, and serial > console access for the 6.0-RELEASE. > > Thanks, -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.orgReceived on Fri Dec 16 2005 - 19:10:51 UTC
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