syzbot


WARNING: refcount bug in ip6_tnl_dev_uninit
Status: internal: reported C repro on 2021/03/27 07:16
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: ipv6: remove extra dev_hold() for fallback tunnels
Patched on: [ci-upstream-bpf-next-kasan-gce ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce], missing on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 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-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 26d, last: 21d

Cause bisection: introduced by (bisect log) :
commit 997acaf6b4b59c6a9c259740312a69ea549cc684
Author: Mark Rutland <mark.rutland@arm.com>
Date: Mon Jan 11 15:37:07 2021 +0000

  lockdep: report broken irq restoration

Crash: WARNING in kvm_wait (log)
Repro: C syz .config

Sample crash report:

Crashes (16):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-kasan-gce 2021/03/28 17:02 net-next a1281601 a8529b82 .config log report syz C WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/29 01:40 net-next a1281601 a8529b82 .config log report syz WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/28 12:40 net-next a1281601 a8529b82 .config log report syz WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/31 22:31 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/31 10:36 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/31 09:10 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/30 13:03 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/30 00:06 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/29 21:59 net-next 37f368d8 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/29 03:23 net-next a1281601 a8529b82 .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/28 16:31 net-next a1281601 a8529b82 .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/28 12:22 net-next a1281601 a8529b82 .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/27 07:34 net-next a1281601 a8529b82 .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-net-kasan-gce 2021/03/27 07:15 net-next a1281601 a8529b82 .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-linux-next-kasan-gce-root 2021/04/01 10:04 linux-next 93129492 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit
ci-upstream-linux-next-kasan-gce-root 2021/03/30 10:33 linux-next 93129492 6a81331a .config log report info WARNING: refcount bug in ip6_tnl_dev_uninit