INFO: task hung in addrconf_dad_work
Status: upstream: reported C repro on 2019/02/16 10:20
First crash: 833d, last: 1d03h

Cause bisection: the bug happens on the oldest tested release
Crash: INFO: task hung in rtnl_lock (log)
Repro: C syz .config

Fix bisection: the fix commit could be any of (bisect log):

  2618500dd370 arm: dts: mediatek: Update mt7629 dts to reflect the latest dt-binding
  c9b96eb6da2a Merge branch 'Update-MT7629-to-support-PHYLINK-API'
  4e3eff5beafa net: ethernet: mediatek: Fix MT7629 missing GMII mode support
  cab209e571a9 tcp: fix a possible lockdep splat in tcp_done()
  8d045995ed5b Merge branch 'mpls-push-pop-fix'
  b790b5549bdf net: dsa: sja1105: Use the correct style for SPDX License Identifier
  39f13ea2f61b net: avoid potential infinite loop in tc_ctl_action()
  fa4e0f8855fc net/sched: fix corrupted L2 header with MPLS 'push' and 'pop' actions
  28aa7c86c2b4 sched: etf: Fix ordering of packets with same txtime
  dedc5a08da07 net: avoid errors when trying to pop MLPS header on non-MPLS packets
  63dfb7938b13 sctp: change sctp_prot .no_autobind with true
  a03681dd5d1b net: cavium: Use the correct style for SPDX License Identifier
  61c1d33daf7b net: i82596: fix dma_alloc_attr for sni_82596
  b31141d390f1 net: dsa: microchip: Use the correct style for SPDX License Identifier
  539825a53604 davinci_cpdma: make cpdma_chan_split_pool static
  ddc790e92b3a net: ethernet: broadcom: have drivers select DIMLIB as needed
  bad28d889cae net: stmmac: make tc_flow_parsers static
  f913eac8e555 net: Update address for vrf and l3mdev in MAINTAINERS
  92696286f3bb net: bcmgenet: Set phydev->dev_flags only for internal PHYs
  efb86fede98c net: bcmgenet: Fix RGMII_MODE_EN value for GENET v1/2/3
  77b6d09f4ae6 net: usb: sr9800: fix uninitialized local variable
  b0818f80c8c1 blackhole_netdev: fix syzkaller reported issue
  bd74708cd979 Revert "blackhole_netdev: fix syzkaller reported issue"
similar bugs (4):
Kernel Title Repro Bisected Count Last Reported Patched Status
android-414 INFO: task hung in addrconf_dad_work 1 397d 397d 0/1 auto-closed as invalid on 2019/10/25 08:37
android-49 INFO: task hung in addrconf_dad_work 1 684d 684d 0/3 auto-closed as invalid on 2019/02/22 20:09
linux-4.19 INFO: task hung in addrconf_dad_work 1 319d 319d 0/1 auto-closed as invalid on 2019/12/24 18:36
linux-4.19 INFO: task hung in addrconf_dad_work (2) syz fix 2 99d 110d 0/1 upstream: reported syz repro on 2020/03/22 17:39

Sample crash report:

Crashes (52):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci-upstream-kasan-gce-selinux-root 2019/02/16 10:13 upstream 5ded5871 f42dee6d .config log report syz C,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2020/07/10 01:17 upstream 0bddd227 bc238812 .config log report,,,,,
ci-upstream-kasan-gce 2020/06/27 00:16 upstream 4a21185c aea82c00 .config log report,,,,,
ci-upstream-kasan-gce 2020/04/23 00:43 upstream 18bf3408 2e44d63e .config log report,,,,,
ci-upstream-kasan-gce-root 2020/04/10 02:40 upstream 5d30bcac a8c6a3f8 .config log report,,,,,
ci-upstream-kasan-gce-selinux-root 2020/03/27 15:31 upstream f3e69428 7d95711b .config log report,,,,,
ci-upstream-kasan-gce-root 2020/03/18 07:23 upstream ac309e77 97bc55ce .config log report,,,,,
ci-upstream-kasan-gce-root 2019/09/16 10:14 upstream 4d856f72 cb936299 .config log report,,,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/09/14 20:04 upstream a7f89616 32d59357 .config log report,,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/09/08 23:26 upstream 950b07c1 a60cb4cd .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/09/06 14:37 upstream 3b47fd5c 040fda58 .config log report,,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/08/31 06:17 upstream 6525771f fd37b39e .config log report,,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce 2019/06/16 02:39 upstream e01e060f 442206d7 .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-selinux-root 2019/03/16 21:26 upstream 9c7dc824 bab43553 .config log report,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/03/12 09:53 upstream a089e4fe 12365b99 .config log report,,,,,,,,,,,,,,,,,,
ci-upstream-kasan-gce-root 2019/01/13 05:06 upstream 66c56cfa c3f3344c .config log report,,,,,,,
ci-upstream-kasan-gce 2018/12/03 21:14 upstream 25956467 819002b0 .config log report,,,,,,,
ci-upstream-kasan-gce-root 2018/11/25 03:51 upstream e195ca6c ecc7c870 .config log report,,,,,,,,
ci-upstream-kasan-gce-selinux-root 2018/10/20 09:12 upstream 270b77a0 ecb386fe .config log report,,,,,,,,
ci-upstream-kasan-gce-selinux-root 2018/10/04 15:37 upstream cec4de30 8b311eaf .config log report,,,,,,,,,,
ci-upstream-kasan-gce-386 2020/07/02 14:59 upstream cd77006e bed10395 .config log report,,,,,
ci-upstream-kasan-gce-386 2019/02/17 02:39 upstream 64c0133e f42dee6d .config log report,,,,,,,,,,,,,,,,
ci-upstream-net-this-kasan-gce 2020/07/05 02:45 net 1ca0fafd 51095195 .config log report,,,,,
ci-upstream-net-this-kasan-gce 2020/06/30 09:19 net 0574e200 a2cdad9d .config log report,,,,,
ci-upstream-net-this-kasan-gce 2020/06/30 00:16 net 0574e200 a2cdad9d .config log report,,,,,
ci-upstream-bpf-kasan-gce 2019/10/18 23:20 bpf 11875ba7 8c88c9c1 .config log report,,,,,,,,,,,,,,,,,,,,
ci-upstream-net-this-kasan-gce 2019/10/17 11:50 net e497c20e 8c88c9c1 .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-bpf-kasan-gce 2019/02/21 17:16 bpf 11fe9262 3133098b .config log report,,,,,,,,,,,,,,,,,
ci-upstream-bpf-kasan-gce 2019/01/17 07:31 bpf 6e8ccb4f c2faf9b2 .config log report,,,,,,,
ci-upstream-net-this-kasan-gce 2018/12/21 19:48 net f0c928d8 588075e6 .config log report,,,,,,,,,
ci-upstream-net-this-kasan-gce 2018/11/29 00:53 net d78a5ebd 4b6d14f2 .config log report,,,,,,,
ci-upstream-net-this-kasan-gce 2018/11/27 08:13 net 69500127 ac912200 .config log report,,,,,,,
ci-upstream-net-this-kasan-gce 2018/10/28 17:55 net 6788fac8 6f9b225a .config log report,,,,,,,,
ci-upstream-net-this-kasan-gce 2018/09/30 07:11 net 43955a45 41e4b329 .config log report,,,,,,,,,,
ci-upstream-net-kasan-gce 2020/06/15 18:59 net-next cb8e59cc baca2611 .config log report,,,,,
ci-upstream-net-kasan-gce 2020/04/14 12:26 net-next 63bef48f 3f3c5574 .config log report,,,,,
ci-upstream-net-kasan-gce 2020/04/14 05:29 net-next 63bef48f 7c54686a .config log report,,,,,
ci-upstream-bpf-next-kasan-gce 2019/10/10 07:23 bpf-next 25bfef43 c4b9981b .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-bpf-next-kasan-gce 2019/06/30 20:03 bpf-next 8daed767 699d6448 .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-net-kasan-gce 2019/05/26 03:14 net-next 22942498 85c57315 .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-bpf-next-kasan-gce 2019/05/02 22:44 bpf-next 2b5bc3c8 e9039493 .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-net-kasan-gce 2019/04/07 15:51 net-next f1054c65 c34fde03 .config log report,,,,,,,,,,,,,,,,,,
ci-upstream-net-kasan-gce 2019/02/11 13:17 net-next 6a98afbb 73f5f452 .config log report,,,,,,,,,,,,,,,,
ci-upstream-net-kasan-gce 2018/12/13 04:08 net-next 3f9b7eee 02613a41 .config log report,,,,,,,
ci-upstream-net-kasan-gce 2018/12/06 04:16 net-next b255e500 764b42c4 .config log report,,,,,,,
ci-upstream-net-kasan-gce 2018/12/02 06:44 net-next 97e6c858 5a581673 .config log report,,,,,,,
ci-upstream-net-kasan-gce 2018/12/01 01:10 net-next 93029d7d ade12e91 .config log report,,,,,,,
ci-upstream-net-kasan-gce 2018/03/30 16:13 net-next 18845557 d47f0ed6 .config log report,,,,,,,,,
ci-upstream-linux-next-kasan-gce-root 2020/07/07 08:03 linux-next 9e50b94b 51095195 .config log report,,,,,
ci-upstream-linux-next-kasan-gce-root 2019/09/20 13:38 linux-next eb2f1273 d96e88f3 .config log report,,,,,,,,,,,,,,,,,,,,
ci-upstream-linux-next-kasan-gce-root 2019/09/08 04:44 linux-next 6d028043 a60cb4cd .config log report,,,,,,,,,,,,,,,,,,,
ci-upstream-linux-next-kasan-gce-root 2019/03/22 11:05 linux-next 32a217ba dce6e62f .config log report,,,,,,,,,,,,,,,,,,