bisecting fixing commit since e28f0104343d0c132fa37f479870c9e43355fee4 building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit e28f0104343d0c132fa37f479870c9e43355fee4 with gcc (GCC) 8.1.0 kernel signature: cc186c7bd0c93e87c887659b1f66af0a883d751643858f2235c45810099fc2c1 run #0: crashed: kernel BUG at mm/huge_memory.c:LINE! run #1: crashed: BUG: unable to handle kernel paging request in wait_consider_task run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #3: crashed: general protection fault in handle_mm_fault run #4: crashed: BUG: Bad page map run #5: crashed: unexpected kernel reboot run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in unlink_anon_vmas run #7: crashed: general protection fault in do_exit run #8: crashed: unexpected kernel reboot run #9: crashed: kernel panic: stack is corrupted in __schedule testing current HEAD 583090b1b8232e6eae243a9009699666153a13a9 testing commit 583090b1b8232e6eae243a9009699666153a13a9 with gcc (GCC) 8.1.0 kernel signature: e7b4fb199d9ec760b080fec1a58c40531d86df9b11b032c9120762b649eb642a run #0: crashed: kernel panic: Fatal exception run #1: crashed: general protection fault in anon_vma_interval_tree_insert run #2: crashed: BUG: unable to handle kernel paging request in find_vma run #3: crashed: kernel BUG at fs/file.c:LINE! run #4: crashed: inconsistent lock state in try_to_wake_up run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in rcu_core run #7: crashed: unexpected kernel reboot run #8: crashed: WARNING: refcount bug in ip6_dst_destroy run #9: crashed: unexpected kernel reboot revisions tested: 2, total time: 20m18.773054254s (build: 9m50.350598994s, test: 10m6.427682907s) the crash still happens on HEAD commit msg: Merge tag 'block5.9-2020-10-08' of git://git.kernel.dk/linux-block crash: unexpected kernel reboot output_len: 0x00000000046afae0 kernel_total_size: 0x0000000005a26000 needed_size: 0x0000000005c00000 trampoline_32bit: 0x000000000009d000 Decompressing Linux... Parsing ELF... done. Booting the kernel. Welcome to Debian GNU/Linux 9 (stretch)! [ OK ] Listening on udev Control Socket. [ OK ] Listening on udev Kernel Socket. [ OK ] Listening on Journal Socket. [ OK ] Started Forward Password Requests to Wall Directory Watch. [ OK ] Listening on Journal Audit Socket. [ OK ] Set up automount Arbitrary Executab…rmats File System Automount Point. [ OK ] Listening on /dev/initctl Compatibility Named Pipe. [ OK ] Reached target Remote File Systems. [ OK ] Started Dispatch Password Requests to Console Directory Watch. [ OK ] Reached target Encrypted Volumes. [ OK ] Listening on Syslog Socket. [ OK ] Listening on Journal Socket (/dev/log). [ OK ] Reached target Sockets. [ OK ] Created slice System Slice. Mounting Huge Pages File System... Starting Load Kernel Modules... Mounting POSIX Message Queue File System... [ OK ] Created slice system-serial\x2dgetty.slice. Starting Remount Root and Kernel File Systems... Starting Journal Service... [ OK ] Created slice system-getty.slice. Mounting /sys/kernel/debug... Starting Create Static Device Nodes in /dev... Mounting /sys/kernel/config... Mounting /proc/sys/fs/binfmt_misc... [ OK ] Reached target Slices. [ OK ] Reached target Swap. [ OK ] Reached target Paths. [ OK ] Mounted Huge Pages File System. [ OK ] Mounted POSIX Message Queue File System. [ OK ] Mounted /sys/kernel/debug. [ OK ] Mounted /sys/kernel/config. [ OK ] Mounted /proc/sys/fs/binfmt_misc. [ OK ] Started Journal Service. [ OK ] Started Load Kernel Modules. [ OK ] Started Remount Root and Kernel File Systems. [ OK ] Started Create Static Device Nodes in /dev. Starting udev Kernel Device Manager... Starting Load/Save Random Seed... [ OK ] Reached target Local File Systems (Pre). Starting udev Coldplug all Devices... Mounting FUSE Control File System... Starting Apply Kernel Variables... Starting Flush Journal to Persistent Storage... [ OK ] Reached target Local File Systems. [ OK ] Mounted FUSE Control File System. [ OK ] Started Load/Save Random Seed. [ OK ] Started Apply Kernel Variables. Starting Raise network interfaces... [ OK ] Started Flush Journal to Persistent Storage. Starting Create Volatile Files and Directories... [ OK ] Started udev Kernel Device Manager. [ OK ] Started Create Volatile Files and Directories. Starting Update UTMP about System Boot/Shutdown... Starting Network Time Synchronization... [ OK ] Started Update UTMP about System Boot/Shutdown.