On Fri, Jul 10, 2009 at 09:42:34PM +1000, John Marshall wrote: > rwsrv05# procstat 1270 > PID PPID PGID SID TSID THR LOGIN WCHAN EMUL COMM > 1270 1 1270 1270 0 1 john vmmaps FreeBSD ELF32 ntpd > > rwsrv05# procstat -k 1270 > PID TID COMM TDNAME KSTACK > 1270 100184 ntpd - mi_switch sleepq_switch sleepq_wait _sleep vm_map_unlock_and_wait vm_map_delete vm_map_fixed vm_mmap mmap syscall Xint0x80_syscall > > rwsrv05# procstat -v 1270 > PID START END PRT RES PRES REF SHD FL TP PATH > 1270 0x8048000 0x807e000 r-x 54 60 2 1 CN vn /usr/local/bin/ntpd > 1270 0x807e000 0x8080000 rw- 2 0 1 0 C- vn /usr/local/bin/ntpd > 1270 0x8080000 0x8100000 rw- 128 0 1 0 C- df > 1270 0x2807e000 0x280ab000 r-x 45 0 170 75 CN vn /libexec/ld-elf.so.1 > 1270 0x280ab000 0x280ad000 rw- 2 0 1 0 C- vn /libexec/ld-elf.so.1 > 1270 0x280ad000 0x280c0000 rw- 19 0 1 0 C- df > 1270 0x280c0000 0x280d7000 r-x 23 0 1 0 CN vn /lib/libm.so.5 > 1270 0x280d7000 0x280d8000 r-x 1 0 1 0 CN vn /lib/libm.so.5 > 1270 0x280d8000 0x280d9000 rw- 1 0 1 0 C- vn /lib/libm.so.5 > 1270 0x280d9000 0x28211000 r-x 312 0 1 0 CN vn /lib/libcrypto.so.5 > 1270 0x28211000 0x28212000 r-x 1 0 1 0 CN vn /lib/libcrypto.so.5 > 1270 0x28212000 0x2822a000 rw- 24 0 1 0 C- vn /lib/libcrypto.so.5 > 1270 0x2822a000 0x2822c000 rw- 2 0 1 0 C- df > 1270 0x2822c000 0x28232000 r-x 6 0 1 0 CN vn /lib/libkvm.so.4 > 1270 0x28232000 0x28233000 r-x 1 0 1 0 CN vn /lib/libkvm.so.4 > 1270 0x28233000 0x28234000 rw- 1 0 1 0 C- vn /lib/libkvm.so.4 > 1270 0x28234000 0x2824c000 r-x 24 0 1 0 CN vn /usr/lib/libelf.so.1 > 1270 0x2824c000 0x2824d000 r-x 1 0 1 0 CN vn /usr/lib/libelf.so.1 > 1270 0x2824d000 0x2824e000 rw- 1 0 1 0 C- vn /usr/lib/libelf.so.1 > 1270 0x2824e000 0x28251000 r-x 3 0 15 10 CN vn /usr/lib/librt.so.1 > 1270 0x28251000 0x28252000 r-x 1 0 1 0 CN vn /usr/lib/librt.so.1 > 1270 0x28252000 0x28253000 rw- 1 0 1 0 C- vn /usr/lib/librt.so.1 > 1270 0x28253000 0x28260000 r-x 13 0 1 0 CN vn /lib/libmd.so.4 > 1270 0x28260000 0x28261000 r-x 1 0 1 0 CN vn /lib/libmd.so.4 > 1270 0x28261000 0x28262000 rw- 1 0 1 0 C- vn /lib/libmd.so.4 > 1270 0x28262000 0x28351000 r-x 239 0 1 0 CN vn /lib/libc.so.7 > 1270 0x28351000 0x28352000 r-x 1 0 1 0 CN vn /lib/libc.so.7 > 1270 0x28352000 0x28358000 rw- 6 0 1 0 C- vn /lib/libc.so.7 > 1270 0x28358000 0x2836e000 rw- 22 0 1 0 C- df > 1270 0x2836e000 0x2837a000 --- 0 0 0 0 -- -- > 1270 0x28400000 0x28500000 rw- 256 0 1 0 C- df > 1270 0xbfbe0000 0xbfc00000 rwx 32 0 1 0 C- df > > rwsrv05# kgdb kernel.debug /dev/mem > GNU gdb 6.1.1 [FreeBSD] > Copyright 2004 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-marcel-freebsd"... > #0 sched_switch (td=0xc08af410, newtd=0xc4d4db40, flags=260) > at /usr/src/sys/kern/sched_ule.c:1864 > 1864 cpuid = PCPU_GET(cpuid); > Ready to go. Enter 'tr' to connect to the remote target > with /dev/cuad0, 'tr /dev/cuad1' to connect to a different port > or 'trf portno' to connect to the remote target with the firewire > interface. portno defaults to 5556. > > Type 'getsyms' after connection to load kld symbols. > > If you're debugging a local system, you can use 'kldsyms' instead > to load the kld symbols. That's a less obnoxious interface. > (kgdb) proc 1270 > [Switching to thread 168 (Thread 100184)]#0 sched_switch (td=0xc592fd80, newtd=0xc4d4db40, flags=0x104) > at /usr/src/sys/kern/sched_ule.c:1864 > 1864 cpuid = PCPU_GET(cpuid); > (kgdb) bt > #0 sched_switch (td=0xc592fd80, newtd=0xc4d4db40, flags=0x104) at /usr/src/sys/kern/sched_ule.c:1864 > During symbol reading, Incomplete CFI data; unspecified registers at 0xc06009d6. > #1 0xc05e788f in mi_switch (flags=0x104, newtd=0x0) at /usr/src/sys/kern/kern_synch.c:444 > #2 0xc061695c in sleepq_switch (wchan=0xc5909f00, pri=0x44) at /usr/src/sys/kern/subr_sleepqueue.c:505 > #3 0xc06175f5 in sleepq_wait (wchan=0xc5909f00, pri=0x44) at /usr/src/sys/kern/subr_sleepqueue.c:584 > #4 0xc05e7d39 in _sleep (ident=0xc5909f00, lock=0xc0a26724, priority=0x244, wmesg=0xc0837aa0 "vmmaps", timo=0x0) > at /usr/src/sys/kern/kern_synch.c:232 > #5 0xc0761a37 in vm_map_unlock_and_wait (map=0xc5909e80, timo=0x0) at /usr/src/sys/vm/vm_map.c:638 > #6 0xc0761ae7 in vm_map_delete (map=0xc5909e80, start=0x2836e000, end=0x28374000) at /usr/src/sys/vm/vm_map.c:2703 > #7 0xc07634ce in vm_map_fixed (map=0xc5909e80, object=0xc5254990, offset=0x0, start=0x2836e000, length=0x6000, > prot=0x5, max=0x7, cow=0x112) at /usr/src/sys/vm/vm_map.c:1367 > #8 0xc0765ba8 in vm_mmap (map=0xc5909e80, addr=0xe787ac70, size=0x6000, prot=Variable "prot" is not available. > ) at /usr/src/sys/vm/vm_mmap.c:1439 > #9 0xc076634f in mmap (td=0xc592fd80, uap=0xe787acf8) at /usr/src/sys/vm/vm_mmap.c:390 > #10 0xc07bb6bf in syscall (frame=0xe787ad38) at /usr/src/sys/i386/i386/trap.c:1073 > #11 0xc07a0150 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:261 > #12 0x00000033 in ?? () > Previous frame inner to this frame (corrupt stack?) > (kgdb) f 6 > #6 0xc0761ae7 in vm_map_delete (map=0xc5909e80, start=0x2836e000, end=0x28374000) at /usr/src/sys/vm/vm_map.c:2703 > 2703 (void) vm_map_unlock_and_wait(map, 0); > (kgdb) p *entry > $1 = { > prev = 0xc5812b40, > next = 0xc59ec7e0, > left = 0xc5812b40, > right = 0xc59ec7e0, > start = 0x2836e000, > end = 0x2837a000, > avail_ssize = 0x0, > adj_free = 0x86000, > max_free = 0x976e0000, > object = { > vm_object = 0x0, > sub_map = 0x0 > }, > offset = 0x0, > eflags = 0x600, > protection = 0x0, > max_protection = 0x7, > inheritance = 0x1, > wired_count = 0xffffffff, > lastr = 0x1c, > uip = 0x0 > } > (kgdb) Thank you, I see what is going on. Please, try the following patch. diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 7cc2c2d..dc7a490 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c _at__at_ -2354,12 +2354,12 _at__at_ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, if (entry->wired_count == 0) { if ((entry->protection & (VM_PROT_READ|VM_PROT_EXECUTE)) == 0) { + entry->eflags |= MAP_ENTRY_WIRE_SKIPPED; if ((flags & VM_MAP_WIRE_HOLESOK) == 0) { end = entry->end; rv = KERN_INVALID_ADDRESS; goto done; } - entry->eflags |= MAP_ENTRY_WIRE_SKIPPED; goto next_entry; } entry->wired_count++;
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