bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on f30c14bfec4b49e528a756b28cc010925e2f286b
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 2957ddfffe8ba3bdd933ea64341bb643079065308fb7ced20538455bf8ba6334
all runs: crashed: possible deadlock in do_io_accounting
testing current HEAD f11944f1aa1cda3fd8b4edc71e3cf9dceb40234f
testing commit f11944f1aa1cda3fd8b4edc71e3cf9dceb40234f
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 5d72baba106cd395552c15ee67b7a416889824ff297c095b95d74568739bbf91
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m6.097074919s (build: 22m27.212924658s, test: 7m7.580126576s)
the crash still happens on HEAD
commit msg: Linux 4.14.248
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1