bisecting fixing commit since 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
building syzkaller on c8e81ce4c7e3b59e7c83c6fab56c217916f3b3b6
testing commit 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 3b817bf1d3536f839ce01285726f4269393ac7c20ab1538584b00cb98e6f9db1
run #0: crashed: BUG: unable to handle kernel
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #2: crashed: BUG: unable to handle kernel
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #5: crashed: BUG: unable to handle kernel
run #6: crashed: BUG: unable to handle kernel
run #7: crashed: BUG: unable to handle kernel
run #8: crashed: BUG: unable to handle kernel
run #9: crashed: BUG: unable to handle kernel
run #10: crashed: BUG: unable to handle kernel
run #11: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #12: crashed: BUG: unable to handle kernel
run #13: crashed: BUG: unable to handle kernel
run #14: crashed: BUG: unable to handle kernel
run #15: crashed: BUG: unable to handle kernel
run #16: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #17: crashed: BUG: unable to handle kernel
run #18: crashed: BUG: unable to handle kernel
run #19: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
testing current HEAD 964f3712e6a7447d9d3203f2be3f6c50e78ea179
testing commit 964f3712e6a7447d9d3203f2be3f6c50e78ea179
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6e2bac3d077a96d21551a16adb28470b2f4767b5f50735c15c91bc2ce3bdaf0c
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m13.171618827s (build: 22m45.860558412s, test: 6m20.653212746s)
the crash still happens on HEAD
commit msg: Linux 4.14.240
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1