Date: Fri, 25 Aug 2006 15:10:21 GMT From: lurca@okolar.net To: freebsd-bugs@FreeBSD.org Subject: RE: kern/99200:[bluetooth] SMP-Kernel crashes reliably when bluetooth-connection speeds up Message-ID: <200608251510.k7PFALW7007508@freefall.freebsd.org>
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The following reply was made to PR kern/99200; it has been noted by GNATS.
From: lurca@okolar.net
To: undisclosed-recipients:;
Cc:
Subject: RE: kern/99200:[bluetooth] SMP-Kernel crashes reliably when bluetooth-connection speeds up
Date: Fri, 25 Aug 2006 12:21:54 +0000 (UTC)
This is a kernel (on the same machine) with
"makeoptions DEBUG=-g" enabled.
It behaves different from the one
without this option - it seems more stable.
An scp from the peer comes in with about 18 KB/s - an scp tranferring
from the host to the peer goes up to 40 KB/s, then either the ppp dies
or the host panics.
Without DEBUG the host crashes after transmission of half a page on an ls -l command in ssh.
(A non-SMP-Kernel transfers with 80 KB/s in both directions for hours.)
The following sticks to the handbook...
---------------------------------------------------------
GNU gdb 6.1.1 [FreeBSD]
....
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x8
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc04a5423
stack pointer = 0x28:0xd71ddc88
frame pointer = 0x28:0xd71ddc94
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 24 (usbtask)
trap number = 12
panic: page fault
cpuid = 0
Uptime: 24m20s
Dumping 447 MB (2 chunks)
chunk 0: 1MB (159 pages) ... ok
chunk 1: 447MB (114432 pages) 432 416 400 384 368 352 336 320 304 288 272 256 240 224 208 192 176 160 144 128 112 96 80 64 48 32 16
#0 doadump () at pcpu.h:165
165 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0 doadump () at pcpu.h:165
#1 0xc04ef4a1 in boot (howto=260) at ../../../kern/kern_shutdown.c:402
#2 0xc04ef7c9 in panic (fmt=0xc06788e5 "%s") at ../../../kern/kern_shutdown.c:558
#3 0xc0654f20 in trap_fatal (frame=0xd71ddc48, eva=8) at ../../../i386/i386/trap.c:836
#4 0xc0654c5f in trap_pfault (frame=0xd71ddc48, usermode=0, eva=8)
at ../../../i386/i386/trap.c:744
#5 0xc06548b9 in trap (frame=
{tf_fs = 8, tf_es = -685965272, tf_ds = 40, tf_edi = -1028263936, tf_esi = -1027805504, tf_ebp = -685908844, tf_isp = -685908876, tf_ebx = 0, tf_edx = 11, tf_ecx = -1027935232, tf_eax = -1027805504, tf_trapno = 12, tf_err = 0, tf_eip = -1068870621, tf_cs = 32, tf_eflags = 66051, tf_esp = -1027899024, tf_ss = -1028263936}) at ../../../i386/i386/trap.c:434
#6 0xc06421ba in calltrap () at ../../../i386/i386/exception.s:139
#7 0xc04a5423 in uhci_remove_bulk (sc=0xc2b5f000, sqh=0xc2bceec0)
at ../../../dev/usb/uhci.c:398
#8 0xc04a6c61 in uhci_device_bulk_done (xfer=0xc2bceec0) at ../../../dev/usb/uhci.c:2800
#9 0xc04aecdf in usb_transfer_complete (xfer=0xc2bb8100) at ../../../dev/usb/usbdi.c:861
#10 0xc04a6162 in uhci_abort_xfer (xfer=0xc2bb8100, status=USBD_NO_POWER)
at ../../../dev/usb/uhci.c:2021
#11 0xc04a58a1 in uhci_timeout_task (addr=0xc2bb8100) at ../../../dev/usb/uhci.c:1534
#12 0xc04ab891 in usb_task_thread (arg=0x0) at ../../../dev/usb/usb.c:476
#13 0xc04dab65 in fork_exit (callout=0xc04ab7f8 <usb_task_thread>, arg=0x0, frame=0xd71ddd38)
at ../../../kern/kern_fork.c:805
#14 0xc064221c in fork_trampoline () at ../../../i386/i386/exception.s:208
(kgdb) list *0xc04a5423
0xc04a5423 is in uhci_remove_bulk (../../../dev/usb/uhci.c:398).
393 Static __inline uhci_soft_qh_t *
394 uhci_find_prev_qh(uhci_soft_qh_t *pqh, uhci_soft_qh_t *sqh)
395 {
396 DPRINTFN(15,("uhci_find_prev_qh: pqh=%p sqh=%p\n", pqh, sqh));
397
398 for (; pqh->hlink != sqh; pqh = pqh->hlink) {
399 #if defined(DIAGNOSTIC) || defined(USB_DEBUG)
400 if (le32toh(pqh->qh.qh_hlink) & UHCI_PTR_T) {
401 printf("uhci_find_prev_qh: QH not found\n");
402 return (NULL);
(kgdb) quit
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