net test error: BUG: using smp_processor_id() in preemptible code in corrupted

net test error: BUG: using smp_processor_id() in preemptible code in corrupted
Status: internal: reported on 2020/06/14 22:38
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: 81198536 ext4: mballoc: Use this_cpu_read instead of this_cpu_ptr
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-upstream-bpf-next-kasan-gce ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 20d, last: 18d

Sample crash report:

2020/06/16 21:07:06 fuzzer started
2020/06/16 21:07:06 connecting to host at 10.128.0.26:34819
2020/06/16 21:07:06 checking machine...
2020/06/16 21:07:06 checking revisions...
2020/06/16 21:07:06 testing simple program...
login: [   65.391478][ T6814] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6814
2020/06/16 21:07:07 building call list...

Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-net-this-kasan-gce	2020/06/16 21:07	net	b15bb881	559fbe2d	.config	log	report
ci-upstream-net-this-kasan-gce	2020/06/15 19:25	net	96144c58	baca2611	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-net-this-kasan-gce	2020/06/14 22:37	net	96144c58	2a22c77a	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu