Date: Tue, 23 May 2017 22:25:30 +0200 From: Andreas Longwitz <longwitz@incore.de> To: Domagoj Stolfa <domagoj.stolfa@gmail.com>, freebsd-dtrace@freebsd.org Subject: Re: fbt:kernel:breadn_flags:entry): invalid address (0x0) in action #7 Message-ID: <59249ABA.4020404@incore.de> In-Reply-To: <20170522120326.GA45031@vulture.cbsd.home> References: <591E01F5.8080208@incore.de> <6A020677-BC76-41E1-8372-10B7962F4EDE@apple.com> <20170518204534.GA37126@wraith> <20170518235207.GB37643@wkstn-mjohnston.west.isilon.com> <5921F56F.7090509@incore.de> <20170521210051.GA43039@vulture.cbsd.home> <5922CEFC.8020306@incore.de> <20170522120326.GA45031@vulture.cbsd.home>
next in thread | previous in thread | raw e-mail | index | archive | help
>
> Could you please supply the full script please? It might give some clue as to
> where the problem is.
>
I have found my mistake: "action #7" means line 7 in the probe and has
nothing to do with the parameters of the probed function. So I could
handle this NULL-problem and now my probe fires correct. This is the
(corrected) probe:
fbt::breadn_flags:entry
/self->bread && args[6] == 0/
{
this->bread_vnode = args[0];
this->bread_blkno = (unsigned long)args[1];
this->bread_inode = (struct inode *)(this->bread_vnode->v_data);
this->bread_inum = this->bread_inode->i_number;
this->bread_gj = this->bread_vnode->v_mount->mnt_gjprovider != NULL ?
stringof(this->bread_vnode->v_mount->mnt_gjprovider) : "<NULL>";
printf(" gj=%s, inum=%u, blkno=%lu\n", this->bread_gj,
this->bread_inum, this->bread_blkno );
}
and now it fires like this:
1 31371 breadn_flags:entry gj=<NULL>, inum=0, blkno=320
Thaks for help!
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?59249ABA.4020404>