Date: Thu, 15 May 2003 05:40:03 -0700 (PDT) From: Giorgos Keramidas <keramida@freebsd.org> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/47538: tar buggy on memory disk partitions Message-ID: <200305151240.h4FCe3fZ072587@freefall.freebsd.org>
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The following reply was made to PR bin/47538; it has been noted by GNATS.
From: Giorgos Keramidas <keramida@freebsd.org>
To: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
Cc: bug-followup@freebsd.org
Subject: Re: bin/47538: tar buggy on memory disk partitions
Date: Thu, 15 May 2003 15:34:50 +0300
Just a note that mdconfig -d is badly broken here. This is probably an
indication of more serious problems of md(4) that might be related to
this problem report:
: Date: Thu, 15 May 2003 02:24:28 +0300
: Subject: Panic with swap-backed md devices
: From: Giorgos Keramidas <keramida@ceid.upatras.gr>
: To: current@freebsd.org
: Message-ID: <20030514232428.GA731@gothmog.gr>
:
: Trying to create and destroy a swap-backed md device results in panics
: with today's CURRENT. I was trying to make a new -t swap md disk to
: test the problem described in a PR. Using the following small shell
: script I noticed that it always causes a panic when mdconfig -d is run:
:
: mdconfig -a -t swap -s 100m -u 10
: disklabel -r -w md10 auto
: newfs -O 1 -b 8192 -s 1024 md10
: mount /dev/md10 /mnt
: mount
: umount /mnt
: mount
: mdconfig -d -u 10
:
: The backtrace, in case anyone can understand from it why the kernel
: panics is:
:
: # gdb -k /usr/obj/usr/src/sys/CELERON/kernel.debug vmcore.10
: GNU gdb 5.2.1 (FreeBSD)
: Copyright 2002 Free Software Foundation, Inc.
: GDB is free software, covered by the GNU General Public License, and you are
: welcome to change it and/or distribute copies of it under certain conditions.
: Type "show copying" to see the conditions.
: There is absolutely no warranty for GDB. Type "show warranty" for details.
: This GDB was configured as "i386-undermydesk-freebsd"...
: panic: from debugger
: panic messages:
: ---
: panic: mutex vm object not owned at /usr/src/sys/vm/vm_pager.c:267
: Stack backtrace:
: panic: from debugger
: Uptime: 58m16s
: Dumping 511 MB
: ata0: resetting devices ..
: done
: 16 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
: ---
: Reading symbols from /usr/obj/usr/src/sys/CELERON/modules/usr/src/sys/modules/acpi/acpi.ko.debug...done.
: Loaded symbols for /usr/obj/usr/src/sys/CELERON/modules/usr/src/sys/modules/acpi/acpi.ko.debug
: Reading symbols from /boot/kernel/star_saver.ko...done.
: Loaded symbols for /boot/kernel/star_saver.ko
: #0 doadump () at /usr/src/sys/kern/kern_shutdown.c:238
: 238 dumping++;
: (kgdb) bt/x
: A syntax error in expression, near `x'.
: (kgdb) bt
: #0 doadump () at /usr/src/sys/kern/kern_shutdown.c:238
: #1 0xc01da79d in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:370
: #2 0xc01daa2f in panic () at /usr/src/sys/kern/kern_shutdown.c:543
: #3 0xc0138669 in db_panic () at /usr/src/sys/ddb/db_command.c:448
: #4 0xc013860c in db_command (last_cmdp=0xc03263c0, cmd_table=0x0, aux_cmd_tablep=0xc0322028,
: aux_cmd_tablep_end=0xc032202c) at /usr/src/sys/ddb/db_command.c:346
: #5 0xc01386d7 in db_command_loop () at /usr/src/sys/ddb/db_command.c:470
: #6 0xc013ac3a in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_trap.c:72
: #7 0xc02c8224 in kdb_trap (type=3, code=0, regs=0xdce06a5c) at /usr/src/sys/i386/i386/db_interface.c:170
: #8 0xc02d721c in trap (frame=
: {tf_fs = -1070858216, tf_es = 16, tf_ds = 16, tf_edi = 256, tf_esi = -1003533952, tf_ebp = -589272416, tf_isp = -589272440, tf_ebx = 0, tf_edx = 0, tf_ecx = -1070041760, tf_eax = 18, tf_trapno = 3, tf_err = 0, tf_eip = -1070824307, tf_cs = 8, tf_eflags = 646, tf_esp = -1070554621, tf_ss = -589272388}) at /usr/src/sys/i386/i386/trap.c:593
: #9 0xc02c9748 in calltrap () at {standard input}:96
: #10 0xc01da9e7 in panic (fmt=0x0) at /usr/src/sys/kern/kern_shutdown.c:527
: #11 0xc01d3aac in _mtx_assert (m=0xc43bc000, what=0, file=0xc03195a2 "/usr/src/sys/vm/vm_pager.c", line=267)
: at /usr/src/sys/kern/kern_mutex.c:840
: #12 0xc02a8b8d in vm_pager_deallocate (object=0xc43bc000) at /usr/src/sys/vm/vm_pager.c:267
: #13 0xc015440b in mddestroy (sc=0xc4448700, td=0xc42f4980) at /usr/src/sys/dev/md/md.c:935
: #14 0xc01545d7 in mddetach (unit=10, td=0xc42f4980) at /usr/src/sys/dev/md/md.c:1025
: #15 0xc01546cc in mdctlioctl (dev=0xc037c420, cmd=3249564929, addr=0xc5e5ca00 "", flags=3, td=0xc42f4980)
: at /usr/src/sys/dev/md/md.c:1072
: #16 0xc01ae3d2 in spec_ioctl (ap=0xdce06b88) at /usr/src/sys/fs/specfs/spec_vnops.c:347
: #17 0xc01add67 in spec_vnoperate (ap=0x0) at /usr/src/sys/fs/specfs/spec_vnops.c:123
: #18 0xc0228047 in vn_ioctl (fp=0xc41e1dd4, com=3249564929, data=0xc5e5ca00, active_cred=0xc1511280, td=0xc42f4980)
: at vnode_if.h:488
: #19 0xc01f68ac in ioctl (td=0xc42f4980, uap=0xdce06d14) at file.h:251
: #20 0xc02d797d in syscall (frame=
: {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 134561322, tf_esi = -1077936632, tf_ebp = -1077936888, tf_isp = -589271692, tf_ebx = 3, tf_edx = 0, tf_ecx = 0, tf_eax = 54, tf_trapno = 12, tf_err = 2, tf_eip = 134516183, tf_cs = 31, tf_eflags = 658, tf_esp = -1077936932, tf_ss = 47}) at /usr/src/sys/i386/i386/trap.c:1021
: #21 0xc02c979d in Xint0x80_syscall () at {standard input}:138
: ---Can't read userspace from dump, or kernel process---
:
: (kgdb) up 12
: #12 0xc02a8b8d in vm_pager_deallocate (object=0xc43bc000) at /usr/src/sys/vm/vm_pager.c:267
: 267 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
: (kgdb) list
: 262 void
: 263 vm_pager_deallocate(object)
: 264 vm_object_t object;
: 265 {
: 266
: 267 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
: 268 (*pagertab[object->type]->pgo_dealloc) (object);
: 269 }
: 270
: 271 /*
: (kgdb) up
: #13 0xc015440b in mddestroy (sc=0xc4448700, td=0xc42f4980) at /usr/src/sys/dev/md/md.c:935
: 935 vm_pager_deallocate(sc->object);
: (kgdb) list
: 930 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ?
: 931 FREAD : (FREAD|FWRITE), sc->cred, td);
: 932 if (sc->cred != NULL)
: 933 crfree(sc->cred);
: 934 if (sc->object != NULL) {
: 935 vm_pager_deallocate(sc->object);
: 936 }
: 937 if (sc->indir)
: 938 destroy_indir(sc, sc->indir);
: 939 if (sc->uma)
: (kgdb) quit
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