KCSAN: data-race in mq_clear_sbinfo / test_keyed

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in mq_clear_sbinfo / test_keyed_super kernel				1	1091d	1088d	0/26	auto-closed as invalid on 2021/05/28 16:41
upstream	KCSAN: data-race in mq_clear_sbinfo / test_keyed_super (3) kernel				2	791d	813d	0/26	auto-closed as invalid on 2022/03/24 15:37

================================================================== BUG: KCSAN: data-race in mq_clear_sbinfo / test_keyed_super write to 0xffff888140b17b70 of 8 bytes by task 23031 on cpu 1: mq_clear_sbinfo+0x35/0x50 ipc/mqueue.c:1698 put_ipc_ns+0x28/0xb0 ipc/namespace.c:168 free_nsproxy+0xb8/0x310 kernel/nsproxy.c:195 put_nsproxy include/linux/nsproxy.h:105 [inline] switch_task_namespaces+0xa5/0xc0 kernel/nsproxy.c:249 ksys_unshare+0x518/0x740 kernel/fork.c:3102 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x1b/0x20 kernel/fork.c:3149 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888140b17b70 of 8 bytes by task 23029 on cpu 0: test_keyed_super+0x1a/0x40 fs/super.c:1078 sget_fc+0xe8/0x4e0 fs/super.c:525 vfs_get_super fs/super.c:1135 [inline] get_tree_keyed+0x3f/0x120 fs/super.c:1196 mqueue_get_tree+0x32/0x40 ipc/mqueue.c:430 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 fc_mount+0x12/0x60 fs/namespace.c:994 mq_create_mount ipc/mqueue.c:473 [inline] mq_init_ns+0x26d/0x310 ipc/mqueue.c:1689 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x211/0x360 ipc/namespace.c:84 create_new_namespaces+0x137/0x560 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0xe2/0x120 kernel/nsproxy.c:226 ksys_unshare+0x371/0x740 kernel/fork.c:3077 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x1b/0x20 kernel/fork.c:3149 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff888105acc000 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23029 Comm: syz-executor.1 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================