I am seeing a reproducible panic with
FreeBSD talisker 5.0-RELEASE FreeBSD 5.0-RELEASE #5: Wed Jan 29 10:49:32 CET 2003
root@talisker:/usr/src/sys/i386/compile/TALISKER i386
What I've done is:
- kldload uvisor.ko
- running »/usr/sbin/usbd -d -v«
- running »jpilot-sync -d -l -p /dev/ucom0«
- hitting the sync-button from my visor several times
After hitting the sync-button 5 to 10 times my box panics.
I've some coredumps handy, so I can dig (with some help) deeper into
this.
Script started on Wed Feb 19 22:16:30 2003
patric@talisker:/home/patric$ gdb -k /sys/i386/compile/TALISKER/kernel.debug
/var/crash/vmcore.1
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This GDB was configured as "i386-undermydesk-freebsd"...
panic: bwrite: buffer is not busy???
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x32
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc020c793
stack pointer = 0x10:0xd8db7ad8
frame pointer = 0x10:0xd8db7b0c
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 = 68897 (jpilot-sync)
trap number = 12
panic: page fault
syncing disks, buffers remaining... panic: bwrite: buffer is not busy???
Uptime: 11h14m26s
Dumping 511 MB
ata0: resetting devices ..
done
[CTRL-C to abort] 16[CTRL-C to abort] 32 48 64 80 96 112 128 144 160 176 192 208 224
240 256 272 288 304 320 336 352 368 384 400 416 432 448 464 480 496
---
#0 doadump () at ../../../kern/kern_shutdown.c:232
232 dumping++;
(kgdb) bt
#0 doadump () at ../../../kern/kern_shutdown.c:232
#1 0xc024abd9 in boot (howto=260) at ../../../kern/kern_shutdown.c:364
#2 0xc024ae23 in panic () at ../../../kern/kern_shutdown.c:517
#3 0xc0290bd2 in bwrite (bp=0xce6aa2f0) at ../../../kern/vfs_bio.c:796
#4 0xc02922b5 in vfs_bio_awrite (bp=0xce6aa2f0) at ../../../kern/vfs_bio.c:1643
#5 0xc03183ba in ffs_fsync (ap=0xd8db78e0) at ../../../ufs/ffs/ffs_vnops.c:258
#6 0xc0317517 in ffs_sync (mp=0xc4206200, waitfor=2, cred=0xc1541e80, td=0xc03f6ee0)
at vnode_if.h:612
#7 0xc02a5e2b in sync (td=0xc03f6ee0, uap=0x0) at ../../../kern/vfs_syscalls.c:138
#8 0xc024a7bc in boot (howto=256) at ../../../kern/kern_shutdown.c:273
#9 0xc024ae23 in panic () at ../../../kern/kern_shutdown.c:517
#10 0xc03717a2 in trap_fatal (frame=0xd8db7a98, eva=0) at ../../../i386/i386/trap.c:844
#11 0xc0371482 in trap_pfault (frame=0xd8db7a98, usermode=0, eva=50) at
../../../i386/i386/trap.c:758
#12 0xc0370f70 in trap (frame=
{tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -656704716, tf_esi = -2144570347,
tf_ebp = -656704756, tf_isp = -656704828, tf_ebx = -994069960, tf_edx = -656704716,
tf_ecx = 21, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip = -1071593581, tf_cs = 8,
tf_eflags = 66050, tf_esp = -997247744, tf_ss = -2144570347}) at
../../../i386/i386/trap.c:445
#13 0xc0361778 in calltrap () at {standard input}:98
#14 0xc020c058 in spec_vnoperate (ap=0x0) at ../../../fs/specfs/spec_vnops.c:126
#15 0xc02ae671 in vn_ioctl (fp=0xc4244bf4, com=2150396949, data=0xd8db7c48,
active_cred=0xd8db7b34, td=0xc4264b60)
at vnode_if.h:488
#16 0xc026f8b3 in ioctl (td=0xc4264b60, uap=0xd8db7d10) at file.h:227
#17 0xc0371aca in syscall (frame=
{tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 24, tf_esi = 134691616, tf_ebp =
-1077944152, tf_isp = -656704140, tf_ebx = 1213062036, tf_edx = 24, tf_ecx = 24,
tf_eax = 54, tf_trapno = 12, tf_err = 2, tf_eip = 1212593395, tf_cs = 31, tf_eflags =
582, tf_esp = -1077944244, tf_ss = 47}) at ../../../i386/i386/trap.c:1033
#18 0xc03617cd in Xint0x80_syscall () at {standard input}:140
---Can't read userspace from dump, or kernel process---
(kgdb) l *0xc020c793
0xc020c793 is in spec_ioctl (../../../fs/specfs/spec_vnops.c:346).
341 int error;
342 struct cdevsw *dsw;
343
344 dev = ap->a_vp->v_rdev;
345 dsw = devsw(dev);
346 if (dsw->d_flags & D_NOGIANT) {
347 DROP_GIANT();
348 error = dsw->d_ioctl(dev, ap->a_command,
349 ap->a_data, ap->a_fflag, ap->a_td);
350 PICKUP_GIANT();
(kgdb)
$FreeBSD: src/sys/fs/specfs/spec_vnops.c,v 1.186 2002/11/04 07:29:20 mckusick Exp $
Patric
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