bisecting fixing commit since 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
building syzkaller on c8e81ce4c7e3b59e7c83c6fab56c217916f3b3b6
testing commit 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c7f00b82df2b2240ccc2f12951a979c3ac9dc3aa53f388587b5c1ca12f50c863
run #0: crashed: BUG: unable to handle kernel
run #1: crashed: BUG: unable to handle kernel
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 NULL pointer dereference in blk_mq_map_swqueue
run #6: crashed: BUG: unable to handle kernel
run #7: crashed: BUG: unable to handle kernel
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
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 NULL pointer dereference in blk_mq_map_swqueue
run #14: crashed: BUG: unable to handle kernel
run #15: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted
run #16: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #17: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #18: crashed: BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue
run #19: crashed: BUG: unable to handle kernel
testing current HEAD 162b95d01320370b80cb2d5724cea4ae538ac740
testing commit 162b95d01320370b80cb2d5724cea4ae538ac740
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: bd8cfc435202dbec063283e27b3ee4b18ad2b7e151512bcdcb07a69e3c33a4c4
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 27m49.240432349s (build: 20m15.985624819s, test: 6m6.241290184s)
the crash still happens on HEAD
commit msg: Linux 4.14.244
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1