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

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Thu Mar 23 07:42:04 PDT 2017

Issue #2986 has been updated by tkusumi.

@dillon, thanks for this commit.

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.

Bug #2986: kernel panic when running fio (modified fio)

* 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.

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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