bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207 building syzkaller on 77e2b66864e69c17416614228723a1ebd3581ddc testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217 kernel signature: e1a03097dbc4c0cdc8c5641b1ea60b9632c7e9cb77cbb7a14dbdda44c0d66f7e run #0: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #1: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #2: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #3: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #4: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #5: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #6: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #7: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #8: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #9: crashed: kernel BUG in corrupted run #10: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #11: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #12: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #13: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #14: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #15: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #16: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #17: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #18: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #19: crashed: kernel BUG in ext4_mb_load_buddy_gfp testing current HEAD a6b2dae3ee3a3f9f4db3fab5b4b9e493fecf4acd testing commit a6b2dae3ee3a3f9f4db3fab5b4b9e493fecf4acd with gcc (GCC) 8.4.1 20210217 kernel signature: de69392a3878958ee39aa766f1d60de13b08772792e5543d86456ac58aa89b25 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 27m42.864028035s (build: 20m28.968675511s, test: 6m43.266357185s) the crash still happens on HEAD commit msg: Linux 4.14.235 crash: unregister_netdevice: waiting for DEV to become free 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: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout