KCSAN: data-race in call_rcu / rcu_gp

Title	Replies (including bot)	Last reply
[PATCH 5.15 000/177] 5.15.11-rc1 review	183 (183)	2021/12/21 23:14
[PATCH 5.10 00/99] 5.10.88-rc1 review	106 (106)	2021/12/21 23:13
[PATCH 5.4 00/71] 5.4.168-rc1 review	78 (78)	2021/12/21 23:13
[PATCH rcu 0/14] Miscellaneous fixes for v5.16	20 (20)	2021/09/16 16:53
[syzbot] KCSAN: data-race in call_rcu / rcu_gp_kthread	6 (7)	2021/07/20 16:38

================================================================== 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 ==================================================================