[DragonFlyBSD - Bug #2986] kernel panic when running fio (modified fio)

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2986 has been updated by tkusumi.


@dillon, thanks for this commit.
https://gitweb.dragonflybsd.org/dragonfly.git/commit/e16c650d787872d60f6ca3d20a7f1bc1e0c19261

It did fix the panic, but now threads no longer get killed by oom, nor am I able to kill them.
It continues showing this shortage messages, and requires reboot in the end.
https://leaf.dragonflybsd.org/~tkusumi/diff/fio_bs_swap.PNG


----------------------------------------
Bug #2986: kernel panic when running fio (modified fio)
http://bugs.dragonflybsd.org/issues/2986#change-13085

* Author: tkusumi
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
----------------------------------------
After running for 1 min or so, fio threads either get killed due to oom, or vm subsystem panics.
Both can happen and neither is rare on my environment.
I'm using master.
https://leaf.dragonflybsd.org/~tkusumi/diff/fio_bs_panic.PNG

1. git clone git://git.kernel.dk/fio
2. Make following change

-----------------
# git diff
diff --git a/filesetup.c b/filesetup.c
index bcf95bd5..4579a181 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -243,6 +243,7 @@ static int pre_read_file(struct thread_data *td, struct fio_file *f)

        bs = td->o.max_bs[DDIR_READ];
        b = malloc(bs);
+       b[0] = 0xff;
        memset(b, 0, bs);

        if (lseek(f->fd, f->file_offset, SEEK_SET) < 0) {
-----------------

3. Run below. --bsrange= may need to be changed depending on ram/swap size. In this example 100000 MiB is the size of malloc in above diff.
   # ./configure
   # gmake -j8
   # rm ./xxxxx.* if exists
   # ./fio --name=xxxxx --ioengine=sync --rw=read --bs=32k --size=10m --numjobs=10 --nrfiles=10 --unlink=1 --bsrange=1k:100000m --pre_read=1



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