Hello, syzbot found the following issue on: HEAD commit: e73f0f0e Linux 5.14-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=172196d2300000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5e73542d774430b dashboard link: https://syzkaller.appspot.com/bug?extid=e08a83a1940ec3846cd5 compiler: Debian clang version 11.0.1-2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e08a83a1940ec3846cd5@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in call_rcu / rcu_gp_kthread write to 0xffffffff837328a0 of 8 bytes by task 11 on cpu 0: rcu_gp_fqs kernel/rcu/tree.c:1949 [inline] rcu_gp_fqs_loop kernel/rcu/tree.c:2010 [inline] rcu_gp_kthread+0xd78/0xec0 kernel/rcu/tree.c:2169 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 read to 0xffffffff837328a0 of 8 bytes by task 30193 on cpu 1: __call_rcu_core kernel/rcu/tree.c:2946 [inline] __call_rcu kernel/rcu/tree.c:3062 [inline] call_rcu+0x4b0/0x6c0 kernel/rcu/tree.c:3109 file_free fs/file_table.c:58 [inline] __fput+0x43e/0x4e0 fs/file_table.c:298 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:164 get_signal+0x156c/0x15e0 kernel/signal.c:2581 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000f57 -> 0x0000000000000f58 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 30193 Comm: syz-executor.5 Tainted: G W 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
