===================================================== BUG: KMSAN: uninit-value in ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:516 [inline] BUG: KMSAN: uninit-value in ppp_sync_send+0x21c/0xb60 drivers/net/ppp/ppp_synctty.c:568 ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:516 [inline] ppp_sync_send+0x21c/0xb60 drivers/net/ppp/ppp_synctty.c:568 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2280 [inline] ppp_input+0x1f1/0xe60 drivers/net/ppp/ppp_generic.c:2304 pppoe_rcv_core+0x1d3/0x720 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 pppoe_sendmsg+0xb4f/0xc30 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x91b/0xda0 net/socket.c:2573 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 __sys_sendmmsg+0x2ff/0x880 net/socket.c:2716 __do_sys_sendmmsg net/socket.c:2743 [inline] __se_sys_sendmmsg net/socket.c:2740 [inline] __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2740 x64_sys_call+0x33c2/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: pppoe_sendmsg+0xaed/0xc30 drivers/net/ppp/pppoe.c:896 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x91b/0xda0 net/socket.c:2573 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 __sys_sendmmsg+0x2ff/0x880 net/socket.c:2716 __do_sys_sendmmsg net/socket.c:2743 [inline] __se_sys_sendmmsg net/socket.c:2740 [inline] __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2740 x64_sys_call+0x33c2/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable hdr created at: pppoe_sendmsg+0x5f/0xc30 drivers/net/ppp/pppoe.c:843 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 CPU: 0 UID: 0 PID: 6714 Comm: syz.0.16 Not tainted 6.14.0-rc4-syzkaller-gd082ecbc71e9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 =====================================================