===================================================== BUG: KMSAN: uninit-value in check_copy_size include/linux/thread_info.h:216 [inline] BUG: KMSAN: uninit-value in copy_from_iter include/linux/uio.h:161 [inline] BUG: KMSAN: uninit-value in copy_from_iter_full include/linux/uio.h:170 [inline] BUG: KMSAN: uninit-value in pdu_write_u net/9p/protocol.c:68 [inline] BUG: KMSAN: uninit-value in p9pdu_vwritef+0x458f/0x5100 net/9p/protocol.c:439 check_copy_size include/linux/thread_info.h:216 [inline] copy_from_iter include/linux/uio.h:161 [inline] copy_from_iter_full include/linux/uio.h:170 [inline] pdu_write_u net/9p/protocol.c:68 [inline] p9pdu_vwritef+0x458f/0x5100 net/9p/protocol.c:439 p9_client_prepare_req+0xe64/0x16d0 net/9p/client.c:703 p9_client_rpc+0x28b/0x1460 net/9p/client.c:734 p9_client_write+0x722/0xfa0 net/9p/client.c:1662 v9fs_fid_xattr_set+0x3a6/0x520 fs/9p/xattr.c:130 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x1b4/0x220 fs/9p/xattr.c:159 __vfs_setxattr+0x910/0x960 fs/xattr.c:180 __vfs_setxattr_noperm+0x382/0xe80 fs/xattr.c:214 __vfs_setxattr_locked+0x629/0x690 fs/xattr.c:275 vfs_setxattr+0x440/0x7b0 fs/xattr.c:301 setxattr+0x42e/0x7c0 fs/xattr.c:575 path_setxattr+0x2f4/0x520 fs/xattr.c:595 __do_sys_setxattr fs/xattr.c:611 [inline] __se_sys_setxattr fs/xattr.c:607 [inline] __ia32_sys_setxattr+0x15b/0x1c0 fs/xattr.c:607 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 created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] slab_alloc mm/slub.c:3259 [inline] kmem_cache_alloc_trace+0xaca/0x1140 mm/slub.c:3276 kmalloc include/linux/slab.h:590 [inline] p9_fid_create+0x7d/0x470 net/9p/client.c:892 p9_client_walk+0x15f/0xe50 net/9p/client.c:1175 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0x244/0x520 fs/9p/xattr.c:118 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x1b4/0x220 fs/9p/xattr.c:159 __vfs_setxattr+0x910/0x960 fs/xattr.c:180 __vfs_setxattr_noperm+0x382/0xe80 fs/xattr.c:214 __vfs_setxattr_locked+0x629/0x690 fs/xattr.c:275 vfs_setxattr+0x440/0x7b0 fs/xattr.c:301 setxattr+0x42e/0x7c0 fs/xattr.c:575 path_setxattr+0x2f4/0x520 fs/xattr.c:595 __do_sys_setxattr fs/xattr.c:611 [inline] __se_sys_setxattr fs/xattr.c:607 [inline] __ia32_sys_setxattr+0x15b/0x1c0 fs/xattr.c:607 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 CPU: 1 PID: 3771 Comm: syz-executor.1 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================