Date: Thu, 20 Nov 1997 12:06:06 -0800 (PST) From: Matt Dillon <dillon@best.net> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/5110: kernel page fault / crash in pmap_testbit Message-ID: <199711202006.MAA05616@flea.best.net> Resent-Message-ID: <199711202010.MAA02913@hub.freebsd.org>
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>Number: 5110
>Category: kern
>Synopsis: kernel crash & core in pmap_testbit during pageout
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 20 12:10:01 PST 1997
>Last-Modified:
>Originator: Matt Dillon
>Organization:
Best Internet Communications
>Release: FreeBSD 2.2.5-STABLE i386
>Environment:
FreeBSD 2.2.5 running on PPro 200's
>Description:
We had a kernel panic in the pagedaemon as shown below
...
#12 0xf01014e2 in db_command_loop () at ../../ddb/db_command.c:462
#13 0xf0103c28 in db_trap (type=0xc, code=0x0) at ../../ddb/db_trap.c:73
#14 0xf01b4e8b in kdb_trap (type=0xc, code=0x0, regs=0xefbffec4)
at ../../i386/i386/db_interface.c:126
#15 0xf01bedbf in trap_fatal (frame=0xefbffec4) at ../../i386/i386/trap.c:738
#16 0xf01be8b8 in trap_pfault (frame=0xefbffec4, usermode=0x0)
at ../../i386/i386/trap.c:653
#17 0xf01be557 in trap (frame={tf_es = 0xf09a0010, tf_ds = 0xf0aa0010,
tf_edi = 0x7fffffff, tf_esi = 0x80000000, tf_ebp = 0xefbfff0c,
tf_isp = 0xefbffeec, tf_ebx = 0xf0c2c914, tf_edx = 0xf0a14120,
tf_ecx = 0x40, tf_eax = 0x0, tf_trapno = 0xc, tf_err = 0x0,
tf_eip = 0xf01bcde1, tf_cs = 0x8, tf_eflags = 0x10296,
tf_esp = 0xf0acc444, tf_ss = 0xf01e63e4}) at ../../i386/i386/trap.c:311
#18 0xf01bcde1 in pmap_testbit (pa=0x7016000, bit=0x40)
at ../../i386/i386/pmap.c:2692
#19 0xf01bd191 in pmap_is_modified (pa=0x7016000)
at ../../i386/i386/pmap.c:2908
#20 0xf01ad10d in vm_page_test_dirty (m=0xf0acc444) at ../../vm/vm_page.c:1262
#21 0xf01ae288 in vm_pageout_scan () at ../../vm/vm_pageout.c:644
#22 0xf01aeaf0 in vm_pageout () at ../../vm/vm_pageout.c:1013
#23 0xf010907a in kproc_start (udata=0xf01e3480) at ../../kern/init_main.c:244
#24 0xf0109018 in main (framep=0xefbfffb8) at ../../kern/init_main.c:194
Additional information: in frame #21
(kgdb) print m
$3 = (struct vm_page *) 0xf0acc444
(kgdb) print *m
$4 = {
pageq = {
tqe_next = 0xf0acc410,
tqe_prev = 0xf0ab8c78
},
hashq = {
tqe_next = 0x0,
tqe_prev = 0xf0acc418
},
listq = {
tqe_next = 0x0,
tqe_prev = 0xf0acc420
},
object = 0xf2265280,
pindex = 0x7,
phys_addr = 0x7016000,
queue = 0x81,
flags = 0x24,
pc = 0x16,
wire_count = 0x0,
hold_count = 0x0,
act_count = 0x0,
busy = 0x0,
valid = 0xff,
dirty = 0x0
}
(kgdb) print *m->object
$6 = {
object_list = {
tqe_next = 0xf2265400,
tqe_prev = 0xf2266800
},
cached_list = {
tqe_next = 0x0,
tqe_prev = 0x0
},
shadow_head = {
tqh_first = 0xf28be280,
tqh_last = 0xf2770518
},
shadow_list = {
tqe_next = 0x0,
tqe_prev = 0xf2265410
},
memq = {
tqh_first = 0xf0acc478,
tqh_last = 0xf0acc454
},
type = OBJT_SWAP,
size = 0x9,
ref_count = 0x8,
shadow_count = 0x7,
pg_color = 0x1f,
flags = 0x180,
paging_in_progress = 0x0,
behavior = 0x0,
resident_page_count = 0x9,
paging_offset = 0x0000000000000000,
backing_object = 0x0,
backing_object_offset = 0x0000000000000000,
last_read = 0x0,
page_hint = 0xf0acc374,
pager_object_list = {
tqe_next = 0xf2266280,
tqe_prev = 0xf22657e4
},
handle = 0x0,
un_pager = {
vnp = {
vnp_size = 0x0000004800000002
},
devp = {
devp_pglist = {
tqh_first = 0x2,
tqh_last = 0x48
}
},
swp = {
swp_nblocks = 0x2,
swp_allocsize = 0x48,
swp_blocks = 0xf29b4580,
swp_poip = 0x0
}
}
}
>How-To-Repeat:
no idea
>Fix:
no idea
>Audit-Trail:
>Unformatted:
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