Re: May 8 kernel hangs on reboot while unmounting /kernfs

[Andrew Doran <andrew%hairylemon.org@localhost>]

On Sun, May 11, 2008 at 01:26:07PM -0400, Greg A. Woods wrote:

> --- switch to interrupt stack ---
> Xspllower(0,c040dce7,0,0,8,c05293ea,0,c08103e8,0,ce1115d0) at 
> netbsd:Xspllower+0xf
> mutex_vector_enter(c0bc0388,0,1,0,0,0,0,ce11152c,cdefc000,ce11152c) at 
> netbsd:mutex_vector_enter+0x202

If it happens again, please take the first argument to mutex_vector_enter from 
this point
and give it to 'show lock'. I'd like to see the 'last locked' address.

Thanks,
Andrew

> ffs_sync(cdefc000,1,cc6a5f00,0,0,cdefc000,cde5cb2c,c051ea1d,cdefc000,1) at 
> netbsd:ffs_sync+0x2a7
> VFS_SYNC(cdefc000,1,cc6a5f00,101a,0,c04326b4,1,0,cdda0054,9bbfe000) at 
> netbsd:VFS_SYNC+0x2c
> dounmount(cdefc000,0,cde6c800,0,cdefc044,cdefc000,fffffffd,c0432057,cdefc0d8,c0a5f160)
>  at netbsd:dounmount+0xfd
> mfs_start(cdefc000,0,0,ce111718,ce111718,0,cde5cc9c,c051f782,cdefc000,0) at 
> netbsd:mfs_start+0xef
> VFS_START(cdefc000,0,0,cde5ccc0,0,0,1e5cbcc,c3213a80,0,cdde0e1c) at 
> netbsd:VFS_START+0x25
> do_sys_mount(cde6c800,c0af3980,8076522,bfbfffa2,58,bfbfece0,0,78,cde5ccd8,0) 
> at netbsd:do_sys_mount+0x932
> compat_40_sys_mount(cde6c800,cde5cd00,cde5cd28,bfbfedbc,bfbfe000,cc6bc3d4,2,8076522,bfbfffa2,58)
>  at netbsd:compat_40_sys_mount+0x48
> syscall(cde5cd48,b3,ab,bfbf001f,1f,0,bfbfeedc,bfbfee68,0,bfbfece0) at 
> netbsd:syscall+0xab
> db{0}> reboot
> Mutex error: lockdebug_wantlock: acquiring sleep lock from interrupt context
> 
> lock address : 0x00000000c0bb6c6c type     :     sleep/adaptive
> shared holds :                  0 exclusive:                  0
> shares wanted:                  0 exclusive:                  0
> current cpu  :                  0 last held:                  1
> current lwp  : 0x00000000cde6c800 last held: 000000000000000000
> last locked  : 0x00000000c04c661c unlocked : 0x00000000c04c668e
> initialized  : 0x00000000c04c7685
> owner field  : 000000000000000000 wait/spin:                0/0
> 
> Turnstile chain at 0xc0bb6600.
> => No active turnstile for this lock.
> 
> panic: LOCKDEBUG
> Stopped in pid 156.1 (mount_mfs) at     netbsd:breakpoint+0x4:  popl    %ebp
> db{0}> x/I 0x00000000c04c7685
> netbsd:config_init+0x35:        movl    $0xc0a6d194,%eax
> db{0}> x/I 0x00000000c04c661c
> netbsd:config_devlink+0xec:     movl    netbsd:alldevs_nwrite,%eax
> db{0}> 
> 
> -- 
>                                               Greg A. Woods
> 
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