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Bug #2137

Updated by y0n3t4n1 over 2 years ago

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

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