Hello, syzbot found the following crash on: HEAD commit: 245a4300 Merge branch 'rcu/kcsan' into tip/locking/kcsan git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=12a7d9a5e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a4b9db179318d21f dashboard link: https://syzkaller.appspot.com/bug?extid=e9c2dec6b40030f721c6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e9c2dec6b40030f721c6@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in fuse_lock_inode / process_init_reply read to 0xffff888099cc4d2d of 1 bytes by task 14548 on cpu 1: fuse_lock_inode+0x4c/0x90 fs/fuse/inode.c:351 fuse_lookup+0x3f/0x210 fs/fuse/dir.c:389 __lookup_hash+0xcb/0x110 fs/namei.c:1544 filename_create+0x102/0x2d0 fs/namei.c:3639 user_path_create fs/namei.c:3696 [inline] do_linkat+0xff/0x640 fs/namei.c:4298 __do_sys_link fs/namei.c:4342 [inline] __se_sys_link fs/namei.c:4340 [inline] __x64_sys_link+0x47/0x60 fs/namei.c:4340 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888099cc4d2d of 6 bytes by task 14532 on cpu 0: process_init_reply+0x7a/0xb90 fs/fuse/inode.c:891 fuse_request_end+0x324/0x530 fs/fuse/dev.c:328 end_requests+0x100/0x160 fs/fuse/dev.c:2056 fuse_abort_conn+0x737/0x7d0 fs/fuse/dev.c:2151 fuse_dev_release+0x26b/0x290 fs/fuse/dev.c:2186 __fput+0x1e1/0x520 fs/file_table.c:280 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14532 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
