Date: Thu, 04 Feb 1999 23:00:11 +1000 From: Stephen McKay <syssgm@detir.qld.gov.au> To: freebsd-current@FreeBSD.ORG Cc: syssgm@detir.qld.gov.au Subject: panic: vm_object_qcollapse(): object mismatch Message-ID: <199902041300.XAA10590@nymph.detir.qld.gov.au>
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Hardware: 486DX2/66 16Mb ram, aha1542CF, 2x1Gb SCSI disks
Software: 4.0-current 1-2 days old, softupdates
(vm_map.c is at rev 1.146, for example)
I was running 'make -j5 buildworld'. It swaps like crazy when I do this. :-)
Here's what gdb -k tells me:
...
#9 0xf01425e0 in panic (
fmt=0xf0225c1f "vm_object_qcollapse(): object mismatch")
at ../../kern/kern_shutdown.c:446
#10 0xf01e0772 in vm_object_qcollapse (object=0xf2f001d0)
at ../../vm/vm_object.c:1011
#11 0xf01e08d6 in vm_object_collapse (object=0xf2f001d0)
at ../../vm/vm_object.c:1102
#12 0xf01ddae2 in vm_map_copy_entry (src_map=0xf2f4aa00, dst_map=0xf2f4ad00,
src_entry=0xf2ed0e10, dst_entry=0xf2f8edc0) at ../../vm/vm_map.c:2284
#13 0xf01ddd73 in vmspace_fork (vm1=0xf2f4aa00) at ../../vm/vm_map.c:2411
#14 0xf01da833 in vm_fork (p1=0xf2f7db20, p2=0xf2d751e0, flags=20)
at ../../vm/vm_glue.c:231
#15 0xf013d4f0 in fork1 (p1=0xf2f7db20, flags=20) at ../../kern/kern_fork.c:447
#16 0xf013ce65 in fork (p=0xf2f7db20, uap=0xf3021f94)
at ../../kern/kern_fork.c:99
#17 0xf01fe783 in syscall (frame={tf_es = 134807599, tf_ds = -272695249,
tf_edi = 134750909, tf_esi = 134935201, tf_ebp = -272643652,
tf_isp = -217964572, tf_ebx = 4, tf_edx = 672250004, tf_ecx = 19,
tf_eax = 2, tf_trapno = 12, tf_err = 2, tf_eip = 671826564, tf_cs = 31,
tf_eflags = 662, tf_esp = -272651296, tf_ss = 47})
at ../../i386/i386/trap.c:1100
#18 0xf01f4e9c in Xint0x80_syscall ()
...
(kgdb) p *p
$1 = {pageq = {tqe_next = 0xf02c5240, tqe_prev = 0xf02e4e00}, hnext = 0x0,
listq = {tqe_next = 0xf02e59d0, tqe_prev = 0xf2f69cc8}, object = 0xf2f69cb0,
pindex = 30, phys_addr = 15065088, queue = 4, flags = 1, pc = 0,
wire_count = 0, hold_count = 0, act_count = 27 '\e', busy = 0 '\000',
valid = 255 'ÿ', dirty = 255 'ÿ'}
(kgdb) p object
$2 = (struct vm_object *) 0xf2f001d0
(kgdb) p *object
$3 = {object_list = {tqe_next = 0xf2fdc2b8, tqe_prev = 0xf2f69c3c},
shadow_head = {tqh_first = 0x0, tqh_last = 0xf2f001d8}, shadow_list = {
tqe_next = 0x0, tqe_prev = 0xf2f69cb8}, memq = {tqh_first = 0xf02dbcb0,
tqh_last = 0xf02cc86c}, generation = 11690, type = OBJT_DEFAULT,
size = 32, ref_count = 2, shadow_count = 0, pg_color = 0,
hash_rand = -136756254, flags = 8576, paging_in_progress = 0, behavior = 0,
resident_page_count = 6, cache_count = 0, wire_count = 0,
backing_object = 0xf2f69cb0, backing_object_offset = 0x0000000000000000,
last_read = 0, pager_object_list = {tqe_next = 0xf2f69000,
tqe_prev = 0xf0252f10}, handle = 0x0, un_pager = {vnp = {
vnp_size = 0x0000000000000000}, devp = {devp_pglist = {tqh_first = 0x0,
tqh_last = 0x0}}, swp = {swp_bcount = 0}}}
(kgdb) p *(p->object)
$4 = {object_list = {tqe_next = 0xf2f915e4, tqe_prev = 0xf30fd0e8},
shadow_head = {tqh_first = 0xf2f001d0, tqh_last = 0xf2f001e0},
shadow_list = {tqe_next = 0x0, tqe_prev = 0xf30fef04}, memq = {
tqh_first = 0xf02e7170, tqh_last = 0xf02cff5c}, generation = 10219,
type = OBJT_SWAP, size = 32, ref_count = 3, shadow_count = 1, pg_color = 0,
hash_rand = -136000830, flags = 384, paging_in_progress = 0, behavior = 0,
resident_page_count = 4, cache_count = 1, wire_count = 0,
backing_object = 0x0, backing_object_offset = 0x0000000000000000,
last_read = 29, pager_object_list = {tqe_next = 0xf30fad24,
tqe_prev = 0xf30f0814}, handle = 0x0, un_pager = {vnp = {
vnp_size = 0x0000000000000001}, devp = {devp_pglist = {tqh_first = 0x1,
tqh_last = 0x0}}, swp = {swp_bcount = 1}}}
I'll keep this dump around. What other details do people want?
I'm not likely to even get to look at this let alone solve it. Bummer.
Stephen.
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