Re: kern/38291: panic: LOCKDEBUG, _kernel_unlock: assertion failed: nlocks <= 0, unmounting MFS /tmp

["Greg A. Woods" <woods%planix.com@localhost>]

The following reply was made to PR kern/38291; it has been noted by GNATS.

From: "Greg A. Woods" <woods%planix.com@localhost>
To: NetBSD GNATS <gnats-bugs%NetBSD.org@localhost>
Cc: 
Subject: Re: kern/38291: panic: LOCKDEBUG, _kernel_unlock: assertion failed: 
nlocks <= 0, unmounting MFS /tmp
Date: Tue, 25 Mar 2008 13:07:17 -0400

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 This is definitely different maybe?  but is it related or really different?
 
 uvm_fault(0xc0d2f720, 0xcdbfe000, 1) -> 0xe
 kernel: supervisor trap page fault, code=3D0
 Stopped in pid 156.1 (mount_mfs) at     netbsd:VFS_START+0x47:  movl    0x3=
 c(%eax),%eax
 db{1}> trace
 VFS_START(cdbfe000,0,3,cdbfdcb0,0) at netbsd:VFS_START+0x47
 mount_domount(cdaec0a0,cdbfdc7c,c0c902a0,bfbfffa2,58) at netbsd:mount_domou=
 nt+0x3f5
 do_sys_mount(cdaec0a0,c0c902a0,8076522,bfbfffa2,58) at netbsd:do_sys_mount+=
 0x254
 compat_40_sys_mount(cdaec0a0,cdbfdd04,cdbfdcfc,cdbfdd30,c064dfb7) at netbsd=
 :compat_40_sys_mount+0x59
 syscall(cdbfdd48,b3,ab,bfbf001f,1f) at netbsd:syscall+0x17b
 db{1}> reboot
 syncing disks... Kernel lock error: _kernel_lock: spinout
 
 lock address : 0x00000000c0d51a40 type     :               spin
 shared holds :                  0 exclusive:                  1
 shares wanted:                  0 exclusive:                  1
 current cpu  :                  1 last held:                  0
 current lwp  : 0x00000000cdaec0a0 last held: 0x00000000cda61260
 last locked  : 0x00000000c053df17 unlocked : 0x00000000c064885a
 initialized  : 0x00000000c0526d14
 curcpu holds :                  0 wanted by: 0x00000000cdaec0a0
 
 panic: LOCKDEBUG
 Stopped in pid 156.1 (mount_mfs) at     netbsd:breakpoint+0x4:  popl    %ebp
 db{1}> x/I 0x00000000c053df17
 netbsd:sys_exit+0x26:   movl    0xfffffffc(%ebp),%eax
 db{1}> x/I 0x00000000c0526d14
 netbsd:main+0x2f:       call    netbsd:uvm_init
 db{1}> whatis 0x00000000c0d51a40
 0xc0d51a40 is 0xc0000000+13965888 from VMMAP 0xc0d2f720
 db{1}> x/I 0x00000000c0d51a40
 netbsd:kernel_lock:     addl    %eax,0(%eax)
 db{1}> trace
 breakpoint(cdbfd684,0,cdbfd6b8,c0582fb7,c0a2932f) at netbsd:breakpoint+0x4
 cpu_Debugger(c0a2932f,cdbfd6c4,c36b1800,c0583e67,0) at netbsd:cpu_Debugger+=
 0xb
 panic(c0a284f0,c0583e06,c0a22960,c0a229e6,0) at netbsd:panic+0x164
 lockdebug_abort1(c0d54c40,c0d5e6a0,c0a22960,c0a229e6,1) at netbsd:lockdebug=
 _abort1+0x8d
 lockdebug_abort(c0d51a40,c0c92eb8,c0a22960,c0a229e6,cd051880) at netbsd:loc=
 kdebug_abort+0x4b
 _kernel_lock(1,cdaec0a0,cdbfd798,c05c9d5e,c0d5f800) at netbsd:_kernel_lock+=
 0x219
 VFS_SYNC(cdbff000,2,cc864f00,0,c0100ddf) at netbsd:VFS_SYNC+0x29
 sys_sync(cdaec0a0,0,0,1fb,cdbfd881) at netbsd:sys_sync+0xa3
 vfs_shutdown(d,7000000,cdbfd818,c01e587f,cdbfd844) at netbsd:vfs_shutdown+0=
 x5d
 cpu_reboot(0,0,c01e3d61,c0d425c0,c09c7360) at netbsd:cpu_reboot+0x3f
 db_sifting_cmd(c0355f62,0,cdaf19b9,cdbfd880,7) at netbsd:db_sifting_cmd
 db_command(c0c85520,1,cdbfd948,cdaf19b9,cdbfd91c) at netbsd:db_command+0x39c
 db_command_loop(c05cf2b4,9c,1,cdaf19b9,7) at netbsd:db_command_loop+0xa2
 db_trap(6,0,58,7,c0100ddf) at netbsd:db_trap+0x1a8
 kdb_trap(6,0,cdbfdae4,1,e) at netbsd:kdb_trap+0x1d1
 trap() at netbsd:trap+0x34c
 --- trap (number 6) ---
 VFS_START(cdbfe000,0,3,cdbfdcb0,0) at netbsd:VFS_START+0x47
 mount_domount(cdaec0a0,cdbfdc7c,c0c902a0,bfbfffa2,58) at netbsd:mount_domou=
 nt+0x3f5
 do_sys_mount(cdaec0a0,c0c902a0,8076522,bfbfffa2,58) at netbsd:do_sys_mount+=
 0x254
 compat_40_sys_mount(cdaec0a0,cdbfdd04,cdbfdcfc,cdbfdd30,c064dfb7) at netbsd=
 :compat_40_sys_mount+0x59
 syscall(cdbfdd48,b3,ab,bfbf001f,1f) at netbsd:syscall+0x17b
 db{1}> reboot
 rebooting...
 
 --=20
                                                Greg A. Woods
                                                Planix, Inc.
 
 <woods%planix.com@localhost>     +1 416 489-5852 x122     
http://www.planix.com/
 
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