Re: kern/39307 (mfs will sometimes panic at umount time)

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

The following reply was made to PR kern/39307; it has been noted by GNATS.

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%NetBSD.org@localhost, netbsd-bugs%NetBSD.org@localhost, 
gnats-admin%NetBSD.org@localhost,
        ad%NetBSD.org@localhost, cube%cubidou.net@localhost, 
tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/39307 (mfs will sometimes panic at umount time)
Date: Thu, 25 Sep 2008 01:12:22 +0900

 > i386 GENERIC kernel (which is a cdroot server of cobalt restorecd,
 > also uses mfs heavily) also fails:
 
 GENERIC+DIAGNOSTIC kernel says:
 ---
 bootserver# reboot
 Sep 24 16:08:06 bootserver reboopanic: kernel diagnostic assertion 
"mp->mnt_refcnt == 0" failed: file 
"/home/tsutsui/cobalt/restorecd/usr/src/sys/kern/vfs_subr.c", line 293
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 eip c056b66c cs 8 eflags 246 cr2 cbc92109 ilevel 0
 Stopped in pid 60.1 (mount_mfs) at      netbsd:breakpoint+0x4:  popl    %ebp
 db{0}> tr
 breakpoint(c0a961cf,cc2f2b68,c0ac0140,c0498c15,1,cc1cc004,1,c03ffd96,0,0) at 
netbsd:breakpoint+0x4
 
panic(c0aa40a4,c0a0b690,c0a560c5,c0a567c4,125,1,cc2f2b9c,c04e789a,c0a0b690,c0a567c4)
 at netbsd:panic+0x1b8
 
__kernassert(c0a0b690,c0a567c4,125,c0a560c5,cc3667f8,cc3667f8,cc2f2cac,c04ef319,cc257000,0)
 at netbsd:__kernassert+0x39
 vfs_destroy(cc257000,0,0,cc2f2cd0,0,0,0,cc2f2be8,1000000,c1c0b000) at 
netbsd:vfs_destroy+0xaa
 do_sys_mount(cc37dca0,0,8050db7,bfbfff96,5c,bfbfecc0,0,78,cc2f2d28,c0abb250) 
at netbsd:do_sys_mount+0x9d9
 
sys___mount50(cc37dca0,cc2f2d00,cc2f2d28,bbb44a70,bbb44000,cae398f0,1,8050db7,bfbfff96,5c)
 at netbsd:sys___mount50+0x49
 syscall(cc2f2d48,b3,ab,bfbf001f,bbbc001f,0,bfbfeec4,bfbfee48,0,bfbfecc0) at 
netbsd:syscall+0xab
 db{0}> 
 
 ---
 Izumi Tsutsui