Re: WAPL panic

[David Holland <dholland-tech%netbsd.org@localhost>]

On Tue, Nov 06, 2012 at 11:16:29PM +0100, Edgar Fu? wrote:
 > So, while investigating my WAPL performance problems, It looks like I can 
 > crash the machine (not reliably, but more often that not) with a simple
 >      seq 1 3000 |?xargs mkdir
 > command. I get the following backtrace in ddb (wetware OCR):
 > 
 > panic: wapbl_register_deallocation: out of resources
 > fatal breakpoint trap in supervisor mode
 > trap type 1 code 0 rip ffffffff8016f01d cs 8 rflags 246 cr2 ffff80011fc2d000 
 > cpl 0 rsp fffffe811e0fe6f0
 > Stopped in pid 12551.1 (mkdir) at    netbsd:breakpoint+0x5:  leave
 > db{3}> bt
 > breakpoint() at netbs:breakpoint+0x5
 > vpanic() at netbsd:vpanic+0x1f2
 > printf_nolog() at netbsd:printf_nolog
 > wapbl_register_inode() at netbsd:wapo_register_inode
 > ffs_truncaze() at netbsd:ffs_truncate+0x917
 > ufs_direnter() at netbsd:ufs_direnter+0x481
 > ufs_mkdir() at netbsd:ufs_mkdir+0x617
 > VOP_MKDIR() at netbsd:VOP_MKDIR+0x3b
 > do_sys_mkdir() at netbsd:do_sys_mkdir+0x10f
 > syscall() at netbsd:syscall+0xc4

wapbl_register_inode shouldn't be able to reach that panic...  it's in
wapbl_register_deallocation.

ffs_truncate calls both, but mkdir shouldn't result in things being
released... or so I'd think.

But maybe I'm missing something.

-- 
David A. Holland
dholland%netbsd.org@localhost