bisecting fixing commit since 050272a0423e68207fd2367831ae610680129062
building syzkaller on 0ce7569ee76fda7e5a68b0fe14c93a3e8eb7d108
testing commit 050272a0423e68207fd2367831ae610680129062
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 8f9310fc61bbee4faf4ef98af7721d64dfa8e4fd9ba77a8ae7b0693a73af010e
all runs: crashed: BUG: spinlock recursion in dev_uc_sync
testing current HEAD 66722c42ec916e92cadda46316f8f6e3fdcaedc6
testing commit 66722c42ec916e92cadda46316f8f6e3fdcaedc6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 75d74e0cf87c1a7d6dce099fd041001069d1bc98d5222fb5b0e546dd91d56199
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m3.98176931s (build: 18m11.443626996s, test: 6m19.741738003s)
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