Date: Tue, 24 Apr 2001 00:37:21 -0400 From: Brian Dean <bsd@bsdhome.com> To: freebsd-stable@freebsd.org Subject: panic in mountroot Message-ID: <20010424003721.D84555@vger.bsdhome.com>
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Hi,
I'm working on a bootable CD root filesystem and ran into a panic.
Let me first say that using an IDE cdrom does not exhibit this
problem. However, when I moved the CD to a system with an Adaptec
1542 and a SCSI CD, I got the panic which happens when we go to mount
the root filesystem:
(kgdb) target remote /dev/cuaa0
Remote debugging using /dev/cuaa0
Debugger (msg=0xc0296e78 "Boot flags requested debugger")
at /usr/src/sys/i386/i386/db_interface.c:321
321 }
(kgdb) contin
Continuing.
cd
Program received signal SIGSEGV, Segmentation fault.
dsioctl (Ignoring packet error, continuing...
dev=0xc0716900, cmd=1074029316, data=0xc034ed44 "", flags=1, sspp=0xc0729044)
at /usr/src/sys/kern/subr_diskslice.c:372
372 lp = sp->ds_label;
(kgdb) bt
#0 dsioctl (dev=0xc0716900, cmd=1074029316, data=0xc034ed44 "", flags=1, sspp=0xc0729044)
at /usr/src/sys/kern/subr_diskslice.c:372
#1 0xc016c7b4 in diskioctl (dev=0xc0716900, cmd=1074029316, data=0xc034ed44 "", fflag=1,
p=0xc02d7e20) at /usr/src/sys/kern/subr_disk.c:221
#2 0xc014efd6 in iso_get_ssector (dev=0xc0716900, p=0xc02d7e20)
at /usr/src/sys/isofs/cd9660/cd9660_vfsops.c:127
#3 0xc014f06f in iso_mountroot (mp=0xc0722600, p=0xc02d7e20)
at /usr/src/sys/isofs/cd9660/cd9660_vfsops.c:161
#4 0xc014f0f4 in cd9660_mount (mp=0xc0722600, path=0x0, data=0x0, ndp=0x0, p=0xc02d7e20)
at /usr/src/sys/isofs/cd9660/cd9660_vfsops.c:193
#5 0xc018c115 in vfs_mountroot_try (mountfrom=0xc034ef04 "cd9660:cd0a")
at /usr/src/sys/kern/vfs_conf.c:213
#6 0xc018c2a6 in vfs_mountroot_ask () at /usr/src/sys/kern/vfs_conf.c:270
#7 0xc018bf3f in vfs_mountroot (junk=0x0) at /usr/src/sys/kern/vfs_conf.c:110
#8 0xc01528cc in mi_startup (framep=0xc034efb4) at /usr/src/sys/kern/init_main.c:219
(kgdb) list
367 struct partition *pp;
368
369 slice = dkslice(dev);
370 ssp = *sspp;
371 sp = &ssp->dss_slices[slice];
372 lp = sp->ds_label;
373 switch (cmd) {
374
375 case DIOCGDVIRGIN:
376 lp = (struct disklabel *)data;
(kgdb) p *dev
$1 = {si_flags = 0, si_udev = 3840, si_hash = {le_next = 0xc03fa380, le_prev = 0xc02c36f8},
si_hlist = {slh_first = 0xc3138ec0}, si_name = '\000' <repeats 15 times>, si_drv1 = 0x0,
si_drv2 = 0x0, si_devsw = 0x0, si_devfs = 0x0, si_bdevfs = 0x0, si_iosize_max = 0,
__si_u = {__si_tty = {__sit_tty = 0x0}, __si_disk = {__sid_disk = 0x0,
__sid_mountpoint = 0x0, __sid_bsize_phys = 0, __sid_bsize_best = 0}}}
(kgdb) p ssp
$2 = (struct diskslices *) 0x0
(kgdb) p *sspp
$2 = (struct diskslices *) 0x0
(kgdb) up
#1 0xc016c7b4 in diskioctl (dev=0xc0716a00, cmd=1074029316, data=0xc034ed44 "", fflag=1,
p=0xc02d7e20) at /usr/src/sys/kern/subr_disk.c:221
221 error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
(kgdb) list
216 int error;
217 dev_t pdev;
218
219 pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
220 dp = pdev->si_disk;
221 error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
222 if (error == ENOIOCTL)
223 error = dp->d_devsw->d_ioctl(dev, cmd, data, fflag, p);
224 return (error);
225 }
(kgdb) p *dp
$3 = {d_flags = 0, d_dsflags = 6, d_devsw = 0xc02a31e0, d_dev = 0xc0716a80, d_slice = 0x0,
d_label = {d_magic = 0, d_type = 0, d_subtype = 0, d_typename = '\000' <repeats 15 times>,
d_un = {un_d_packname = '\000' <repeats 15 times>, un_b = {un_d_boot0 = 0x0,
un_d_boot1 = 0x0}}, d_secsize = 0, d_nsectors = 0, d_ntracks = 0, d_ncylinders = 0,
d_secpercyl = 0, d_secperunit = 0, d_sparespertrack = 0, d_sparespercyl = 0,
d_acylinders = 0, d_rpm = 0, d_interleave = 0, d_trackskew = 0, d_cylskew = 0,
d_headswitch = 0, d_trkseek = 0, d_flags = 0, d_drivedata = {0, 0, 0, 0, 0}, d_spare = {
0, 0, 0, 0, 0}, d_magic2 = 0, d_checksum = 0, d_npartitions = 0, d_bbsize = 0,
d_sbsize = 0, d_partitions = {{p_size = 0, p_offset = 0, p_fsize = 0,
p_fstype = 0 '\000', p_frag = 0 '\000', __partition_u1 = {cpg = 0, sgs = 0}}, {
p_size = 0, p_offset = 0, p_fsize = 0, p_fstype = 0 '\000', p_frag = 0 '\000',
__partition_u1 = {cpg = 0, sgs = 0}}, {p_size = 0, p_offset = 0, p_fsize = 0,
p_fstype = 0 '\000', p_frag = 0 '\000', __partition_u1 = {cpg = 0, sgs = 0}}, {
p_size = 0, p_offset = 0, p_fsize = 0, p_fstype = 0 '\000', p_frag = 0 '\000',
__partition_u1 = {cpg = 0, sgs = 0}}, {p_size = 0, p_offset = 0, p_fsize = 0,
p_fstype = 0 '\000', p_frag = 0 '\000', __partition_u1 = {cpg = 0, sgs = 0}}, {
p_size = 0, p_offset = 0, p_fsize = 0, p_fstype = 0 '\000', p_frag = 0 '\000',
__partition_u1 = {cpg = 0, sgs = 0}}, {p_size = 0, p_offset = 0, p_fsize = 0,
p_fstype = 0 '\000', p_frag = 0 '\000', __partition_u1 = {cpg = 0, sgs = 0}}, {
p_size = 0, p_offset = 0, p_fsize = 0, p_fstype = 0 '\000', p_frag = 0 '\000',
__partition_u1 = {cpg = 0, sgs = 0}}}}}
(kgdb) p dp->d_slice
$4 = (struct diskslices *) 0x0
(kgdb)
The d_slice passed into dsioctl() is null which is why the panic
occurs. I don't know why it's null, though. Any ideas? I can
provide more information from this session, just let me know what you
need.
I'm running sources just prior to the tagging for 4.3 release, so
although the version says 4.3-RC, it is, for all intents and purposes,
4.3-RELEASE.
FreeBSD 4.3-RC #0: Mon Apr 23 18:38:03 EDT 2001
root@vger.bsdhome.com:/usr/obj/usr/src/sys/ROROOT
The adaptec controller and cd rom driver are probed as follows if this
helps in some way:
aha0 at port 0x330-0x333 irq 11 drq 5 on isa0
aha0: AHA-1542CF FW Rev. E.0 (ID=45) SCSI Host Adapter, SCSI ID 7, 16 CCBs
...
cd0 at aha0 bus 0 target 5 lun 0
cd0: <TOSHIBA CD-ROM XM-5301TA 1895> Removable CD-ROM SCSI-2 device
cd0: 3.300MB/s transfers
cd0: cd present [67768 x 2048 byte records]
Thanks,
-Brian
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