bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on 6e569755ce2f0efcad474398871ff75693e770fc
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 4321f479bc80e418183913b60567bc4edb230d07032de5737937ccd66e7f90e3
all runs: crashed: general protection fault in do_con_write
testing current HEAD 66722c42ec916e92cadda46316f8f6e3fdcaedc6
testing commit 66722c42ec916e92cadda46316f8f6e3fdcaedc6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 5110fdf0eb3bc031c6c4c39156ebebf7749c369869bb62bba59d1fe1421a9346
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 27m24.389231906s (build: 20m10.711748316s, test: 6m43.516303516s)
the crash still happens on HEAD
commit msg: Linux 4.14.256
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1