I typicly run without any swap space configured -- 320Mb of RAM is
usually fine. However, after noticing a message "get swap space failed"
(or similar) in the nightly report, I tried to tell my Nov 5 -current to
swapon /dev/da0b
I used to do this with full impunity in the past, but this time the
thing paniced with:
IdlePTD 5033984
initial pcb at 3e3f00
panicstr: bwrite: buffer is not busy???
panic messages:
---
Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic.id = 01000000
fault virtual address = 0x18
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc024f50f
stack pointer = 0x10:0xcf0fab8c
frame pointer = 0x10:0xcf0fab98
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 16315 (swapon)
trap number = 12
panic: page fault
cpuid = 0; lapic.id = 01000000
boot() called on cpu#0
syncing disks... panic: bwrite: buffer is not busy???
cpuid = 0; lapic.id = 01000000
boot() called on cpu#0
Uptime: 22h14m15s
Some sources have been re-cvsuped since, but not the vfs_subr.c, where the
actual panic occured, seemingly:
#0 dumpsys () at /ccd/src/sys/kern/kern_shutdown.c:492
warning: Source file is more recent than executable.
492 if (!dodump)
(kgdb) where
#0 dumpsys () at /ccd/src/sys/kern/kern_shutdown.c:492
#1 0xc02124c0 in boot (howto=260) at /ccd/src/sys/kern/kern_shutdown.c:335
#2 0xc021295d in panic (fmt=0xc035c878 "bwrite: buffer is not busy???")
at /ccd/src/sys/kern/kern_shutdown.c:634
#3 0xc0247203 in bwrite (bp=0xc7cea51c) at /ccd/src/sys/kern/vfs_bio.c:666
#4 0xc02484bc in vfs_bio_awrite (bp=0xc7cea51c)
at /ccd/src/sys/kern/vfs_bio.c:1529
#5 0xc02ce8f4 in ffs_fsync (ap=0xcf0faa44)
at /ccd/src/sys/ufs/ffs/ffs_vnops.c:239
#6 0xc02ccdbe in ffs_sync (mp=0xc16be600, waitfor=2, cred=0xc1027b00,
td=0xc04098e4) at vnode_if.h:441
#7 0xc0253c5a in sync (td=0xc04098e4, uap=0x0)
at /ccd/src/sys/kern/vfs_syscalls.c:657
#8 0xc02120e1 in boot (howto=256) at /ccd/src/sys/kern/kern_shutdown.c:244
#9 0xc021295d in panic (fmt=0xc0376e3e "%s")
at /ccd/src/sys/kern/kern_shutdown.c:634
#10 0xc03185ea in trap_fatal (frame=0xcf0fab4c, eva=24)
at /ccd/src/sys/i386/i386/trap.c:939
#11 0xc0318311 in trap_pfault (frame=0xcf0fab4c, usermode=0, eva=24)
at /ccd/src/sys/i386/i386/trap.c:853
#12 0xc0317d4f in trap (frame={tf_fs = 24, tf_es = -821100528,
tf_ds = -831127536, tf_edi = 2, tf_esi = 0, tf_ebp = -821056616,
tf_isp = -821056648, tf_ebx = 0, tf_edx = 1, tf_ecx = -829663484,
#13 0xc024f50f in vlrureclaim (mp=0x0, count=2)
at /ccd/src/sys/kern/vfs_subr.c:561
#14 0xc024f58e in getnewvnode (tag=VT_NON, mp=0x0, vops=0xc163d000,
vpp=0xc04167f8) at /ccd/src/sys/kern/vfs_subr.c:593
#15 0xc02e5b92 in swaponvp (td=0xce8c5704, vp=0xce818080, dev=0xc1714f00,
nblks=0) at /ccd/src/sys/vm/vm_swap.c:268
#16 0xc02e5b02 in swapon (td=0xce8c5704, uap=0xcf0fad20)
at /ccd/src/sys/vm/vm_swap.c:230
#17 0xc0318a98 in syscall (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = -1077938364, tf_esi = 2, tf_ebp = -1077938372,
tf_isp = -821056140, tf_ebx = -1077938105, tf_edx = 0,
tf_ecx = 134571136, tf_eax = 85, tf_trapno = 12, tf_err = 2,
tf_eip = 134515980, tf_cs = 31, tf_eflags = 659, tf_esp = -1077938568,
tf_ss = 47}) at /ccd/src/sys/i386/i386/trap.c:1129
18 0xc030727d 0xc030727din syscall_with_err_pushed ()
#19 0x0 in ?? ()
(kgdb) up 13
#13 0xc024f50f in vlrureclaim (mp=0x0, count=2)
at /ccd/src/sys/kern/vfs_subr.c:561
561 }
[...]
env LANG=C ls -l /ccd/src/sys/kern/vfs_subr.c
-rw-r--r-- 1 mi wheel 76055 Nov 4 16:34 /ccd/src/sys/kern/vfs_subr.c
[...]
(kgdb) up
#14 0xc024f58e in getnewvnode (tag=VT_NON, mp=0x0, vops=0xc163d000,
vpp=0xc04167f8) at /ccd/src/sys/kern/vfs_subr.c:593
593 vlrureclaim(mp, 2);
(kgdb) p mp
$1 = (struct mount *) 0x0
Anything else? Thanks,
-mi
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