bisecting fixing commit since 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
building syzkaller on c8e81ce4c7e3b59e7c83c6fab56c217916f3b3b6
testing commit 9a95f25269bd9257ab9fba7bb14355d50b5f39ec with gcc (GCC) 8.4.1 20210217
kernel signature: 1ba9782821f85e832fbecddfc2ebbed628eb208fa79b333d0268c669d9b202b7
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted
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
run #4: crashed: BUG: unable to handle kernel
run #5: crashed: BUG: unable to handle kernel
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #7: crashed: BUG: unable to handle kernel
run #8: crashed: BUG: unable to handle kernel
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #10: crashed: BUG: unable to handle kernel
run #11: crashed: BUG: unable to handle kernel
run #12: crashed: BUG: unable to handle kernel
run #13: crashed: BUG: unable to handle kernel
run #14: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #15: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted
run #16: crashed: BUG: unable to handle kernel
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 cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: f3dc6071e347411a864e841201d4357bc9eb4b4c0c6e4ff97e9415a5fe17cdbe
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 28m37.80815983s (build: 21m23.187491338s, test: 6m24.985540449s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1