bisecting fixing commit since cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 building syzkaller on 95777977ade5226323e35e6e5fa1594327640732 testing commit cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d7e4aaa164d7e16322b14d0bd4d3d4e81df1a7162719748cc66051a4285af70f run #0: crashed: WARNING in kill_block_super run #1: crashed: WARNING in kill_block_super run #2: crashed: WARNING in efs_kill_sb run #3: crashed: WARNING in kill_block_super run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in kill_block_super run #6: crashed: WARNING in kill_block_super run #7: crashed: WARNING in efs_kill_sb run #8: crashed: WARNING in kill_block_super run #9: crashed: WARNING in kill_block_super run #10: crashed: WARNING in corrupted run #11: crashed: WARNING in efs_kill_sb run #12: crashed: WARNING in corrupted run #13: crashed: WARNING in kill_block_super run #14: crashed: WARNING in kill_block_super run #15: crashed: WARNING in efs_kill_sb run #16: crashed: WARNING in kill_block_super run #17: crashed: WARNING in corrupted run #18: crashed: WARNING in corrupted run #19: crashed: WARNING in corrupted testing current HEAD f051383ef03bde49ca992f297ec80757a702e774 testing commit f051383ef03bde49ca992f297ec80757a702e774 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: f03b2e41a500422c0ad62882da171c9e8745b73850b68f75c12637544a804fdf all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m15.099235712s (build: 13m51.280155914s, test: 6m53.181113983s) the crash still happens on HEAD commit msg: Linux 4.14.285 crash: unregister_netdevice: waiting for DEV to become free IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready syz-executor.0 (7954) used greatest stack depth: 24360 bytes left can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout