linux-kernel - Re: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup

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Date: Thu, 28 Mar 2024 11:23:07 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: ast@...nel.org, yonghong.song@...ux.dev
Cc: daniel@...earbox.net, davem@...emloft.net, eddyz87@...il.com,
 haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com,
 jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, sdf@...gle.com,
 song@...nel.org, syzkaller-bugs@...glegroups.com, andrii@...nel.org,
 alexei.starovoitov@...il.com, bpf@...r.kernel.org,
 syzbot <syzbot+1a3cf6f08d68868f9db3@...kaller.appspotmail.com>
Subject: Re: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup_elem

On 3/28/24 3:01 AM, syzbot wrote:
> Killed
> make[2]: *** [scripts/Makefile.vmlinux_o:62: vmlinux.o] Error 137
> make[2]: *** Deleting file 'vmlinux.o'
> make[1]: *** [/syzkaller/jobs/linux/kernel/Makefile:1141: vmlinux_o] Error 2
> make: *** [Makefile:240: __sub-make] Error 2

My second syzbot test attempt passed the build stage and passed the reproducer 
also. https://lore.kernel.org/all/000000000000b7bdd80614bc433f@google.com/

Not sure what caused the syzbot build error in the first attempt but should be 
unrelated to the fix. I will post the patch.