===================================================== 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+0x15ab/0x5120 net/9p/protocol.c:398 p9pdu_writef+0x23a/0x280 net/9p/protocol.c:539 p9pdu_vwritef+0x21f0/0x5120 net/9p/protocol.c:490 p9_client_prepare_req+0x9e3/0x1090 net/9p/client.c:703 p9_client_rpc+0x276/0x1460 net/9p/client.c:734 p9_client_setattr+0x115/0x2c0 net/9p/client.c:1894 v9fs_vfs_setattr_dotl+0x7e2/0xd70 fs/9p/vfs_inode_dotl.c:588 notify_change+0x1fe3/0x2170 fs/attr.c:410 vfs_utimes+0x8aa/0xc70 fs/utimes.c:65 do_utimes_path fs/utimes.c:98 [inline] do_utimes fs/utimes.c:144 [inline] __do_sys_utime32 fs/utimes.c:247 [inline] __se_sys_utime32+0x386/0x520 fs/utimes.c:235 __ia32_sys_utime32+0x91/0xc0 fs/utimes.c:235 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+0x1fe3/0x2170 fs/attr.c:410 vfs_utimes+0x8aa/0xc70 fs/utimes.c:65 do_utimes_path fs/utimes.c:98 [inline] do_utimes fs/utimes.c:144 [inline] __do_sys_utime32 fs/utimes.c:247 [inline] __se_sys_utime32+0x386/0x520 fs/utimes.c:235 __ia32_sys_utime32+0x91/0xc0 fs/utimes.c:235 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: vfs_utimes+0x69/0xc70 fs/utimes.c:22 do_utimes_path fs/utimes.c:98 [inline] do_utimes fs/utimes.c:144 [inline] __do_sys_utime32 fs/utimes.c:247 [inline] __se_sys_utime32+0x386/0x520 fs/utimes.c:235 CPU: 1 PID: 14669 Comm: syz-executor.4 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================