===================================================== BUG: KMSAN: uninit-value in map_id_up_base kernel/user_namespace.c:335 [inline] BUG: KMSAN: uninit-value in map_id_up kernel/user_namespace.c:365 [inline] BUG: KMSAN: uninit-value in from_kuid+0x51d/0xbd0 kernel/user_namespace.c:413 map_id_up_base kernel/user_namespace.c:335 [inline] map_id_up kernel/user_namespace.c:365 [inline] from_kuid+0x51d/0xbd0 kernel/user_namespace.c:413 p9pdu_vwritef+0x15aa/0x5100 net/9p/protocol.c:398 p9pdu_writef+0x240/0x290 net/9p/protocol.c:539 p9pdu_vwritef+0x21ed/0x5100 net/9p/protocol.c:490 p9_client_prepare_req+0xe64/0x16d0 net/9p/client.c:703 p9_client_rpc+0x28b/0x1460 net/9p/client.c:734 p9_client_setattr+0x113/0x2c0 net/9p/client.c:1894 v9fs_vfs_setattr_dotl+0x7e2/0xd70 fs/9p/vfs_inode_dotl.c:588 notify_change+0x1fde/0x2180 fs/attr.c:410 chmod_common+0x3fb/0x7b0 fs/open.c:581 do_fchmodat fs/open.c:620 [inline] __do_sys_chmod fs/open.c:638 [inline] __se_sys_chmod fs/open.c:636 [inline] __ia32_sys_chmod+0x185/0x2d0 fs/open.c:636 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Uninit was stored to memory at: v9fs_vfs_setattr_dotl+0x58a/0xd70 fs/9p/vfs_inode_dotl.c:565 notify_change+0x1fde/0x2180 fs/attr.c:410 chmod_common+0x3fb/0x7b0 fs/open.c:581 do_fchmodat fs/open.c:620 [inline] __do_sys_chmod fs/open.c:638 [inline] __se_sys_chmod fs/open.c:636 [inline] __ia32_sys_chmod+0x185/0x2d0 fs/open.c:636 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable newattrs created at: chmod_common+0x102/0x7b0 fs/open.c:568 do_fchmodat fs/open.c:620 [inline] __do_sys_chmod fs/open.c:638 [inline] __se_sys_chmod fs/open.c:636 [inline] __ia32_sys_chmod+0x185/0x2d0 fs/open.c:636 CPU: 1 PID: 10383 Comm: syz-executor.4 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================