Date: Thu, 1 Oct 1998 14:36:29 +0930 (CST) From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/8112: 2.2.7 + CAM system panics removing shared memory Message-ID: <199810010506.OAA16445@cain.gsoft.com.au>
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>Number: 8112
>Category: kern
>Synopsis: 2.2.7 + CAM system panics removing shared memory
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Sep 30 22:10:00 PDT 1998
>Last-Modified:
>Originator: Daniel O'Connor
>Organization:
Genesis Software
>Release: FreeBSD 2.2.7-STABLE i386
>Environment:
This is a 2.2.7 source tree with the CAM patches applied.
>Description:
Running cdda2wav creates shared memory segments, if I patch cdda2wav to not remove
them, the system doesn't crash. Trying to remove the segments by hand causes
the same problem though.
It only seems to crash if there are 2 shared memory segments are present and they are
both removed.
The trace is as follows ->
test2# gdb -k kernel.1 vmcore.1
GDB is free software and you are welcome to 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.
GDB 4.16 (i386-unknown-freebsd),
Copyright 1996 Free Software Foundation, Inc...
IdlePTD a27000
current pcb at 21005c
panic: vm_page_free: freeing busy page
#0 boot (howto=260) at ../../kern/kern_shutdown.c:266
266 dumppcb.pcb_cr3 = rcr3();
(kgdb) where
#0 boot (howto=260) at ../../kern/kern_shutdown.c:266
#1 0xf01319b3 in panic (fmt=0xf0113489 "from debugger")
at ../../kern/kern_shutdown.c:400
#2 0xf01134a5 in db_panic (dummy1=-266537335, dummy2=0, dummy3=-1,
dummy4=0xefbffd38 "") at ../../ddb/db_command.c:440
#3 0xf0113395 in db_command (last_cmdp=0xf02011e4, cmd_table=0xf0201034,
aux_cmd_tablep=0xf021d64c) at ../../ddb/db_command.c:337
#4 0xf0113512 in db_command_loop () at ../../ddb/db_command.c:462
#5 0xf0115c at ../../i386/i386/db_interface.c:126
#7 0xf01d8ea4 in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = -272629864,
tf_esi = -266580190, tf_ebp = -272630164, tf_isp = -272630192,
tf_ebx = 256, tf_edx = -266537391, tf_ecx = 2000, tf_eax = 18,
tf_trapno = 3, tf_err = 0, tf_eip = -266537335, tf_cs = 8,
tf_eflags = 582, tf_esp = -266537407, tf_ss = -267183800})
at ../../i386/i386/trap.c:416
#8 0xf01cf689 in Debugger (msg=0xf0131948 "panic")
at ../../i386/i386/db_interface.c:254
#9 0xf01319aa in panic (fmt=0xf01c4f22 "vm_page_free: freeing busy page")
at ../../kern/kern_shutdown.c:398
#10 0xf01c4fe6 in vm_page_freechk_and_unqueue (m=0xf0abd1a4)
at ../../vm/vm_page.c:948
#11 0xf01c506a in vm_page_free (m=0xf0abd1a4) at ../../vm/vm_page.c:1014
#12 0xf01c29c6 in vm_object_terminate (object=0xf1228f80)
at ../../vm/vm_object.c:409
#13 0xf01c2817 in vm_object_deallocate (object=0xf1228f80)
at ../../vm/v#17 0xf01d9923 in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = 0,
tf_esi = 262144, tf_ebp = -272638820, tf_isp = -272629788,
tf_ebx = 537383008, tf_edx = 0, tf_ecx = 0, tf_eax = 171,
tf_trapno = 12, tf_err = 7, tf_eip = 537122097, tf_cs = 31,
tf_eflags = 646, tf_esp = -272638844, tf_ss = 39})
at ../../i386/i386/trap.c:920
#18 0x2003d531 in ?? ()
#19 0x16d6 in ?? ()
#20 0x197d in ?? ()
#21 0x1095 in ?? ()
>How-To-Repeat:
Compile cdda2wav (I hacked it for CAM)
./cdda2wav -B
[ ... ]
[ Program exits ]
panic..
>Fix:
>Audit-Trail:
>Unformatted:
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