With heavier load using 6 jails, I could still trigger this same panic. The kernel was built from source as of a5fc4.
On Mon, Sep 26, 2011 at 01:54:12PM +0900, YONETANI Tomokazu wrote: > Hello. > As I wrote in issue2118, after the fix (1f8fc82a) I started seeing > warning messages on the console under load: > > vm_prefault: Warning, backing object race averted lobject 0xffffffe0749d3210 > > The system used to panic(backtrace at the end of this message) within > a day or two, but with the kernel built from more recent source(fa7cb8ce), > it no longer panics (well, at least for 4 days) running the same load > (pkgsrc bulk build with MAKE_JOBS=5 defined), just the warning messages > shown above all over the console. > > #4 0xffffffff8039c50f in panic ( > fmt=0xffffffff805edf90 "Bad link elm %p prev->next != elm") > at /usr/src/sys/kern/kern_shutdown.c:833 > #5 0xffffffff80532b35 in vm_object_deallocate_locked ( > object=0xffffffe0690b2d10) at /usr/src/sys/vm/vm_object.c:601 > #6 0xffffffff80532c0f in vm_object_deallocate (object=0xffffffe06b9eed10) > at /usr/src/sys/vm/vm_object.c:451 > #7 0xffffffff8052d5bd in vm_map_entry_delete (countp=<optimized out>, > entry=<optimized out>, map=<optimized out>) > at /usr/src/sys/vm/vm_map.c:2608 > #8 vm_map_delete (map=0xffffffe05b0d9a00, start=<optimized out>, > end=140737488355328, countp=<optimized out>) > at /usr/src/sys/vm/vm_map.c:2753 > #9 0xffffffff8052d661 in vm_map_remove (map=0xffffffe05b0d9a00, start=0, > end=<unavailable>) at /usr/src/sys/vm/vm_map.c:2774 > #10 0xffffffff8052d6e9 in vmspace_terminate (vm=0xffffffe05b0d9a00) > at /usr/src/sys/vm/vm_map.c:310 > #11 0xffffffff80370579 in _sysref_put (sr=0xffffffe05b0d9bd0) > at /usr/src/sys/kern/kern_sysref.c:325 > #12 0xffffffff80388079 in sysref_put (sr=<optimized out>) > at /usr/src/sys/sys/sysref2.h:83 > #13 exit1 (rv=<optimized out>) at /usr/src/sys/kern/kern_exit.c:417 > #14 0xffffffff803884a4 in sys_exit (uap=<optimized out>) > at /usr/src/sys/kern/kern_exit.c:121 > #15 0xffffffff805b0308 in syscall2 (frame=0xffffffe076d33c08) > at /usr/src/sys/platform/pc64/x86_64/trap.c:1188 > #16 0xffffffff805a88df in Xfast_syscall () > at /usr/src/sys/platform/pc64/x86_64/exception.S:320 > #17 0x000000000000002b in ?? () > > > Best Regards, > YONETANI Tomokazu
