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Sat, 15 Feb 2025 11:26:03 -0800 (PST) Date: Sat, 15 Feb 2025 11:26:02 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67b0ea4a.050a0220.6f0b7.0019.GAE@google.com> Subject: Re: [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_send (2) From: syzbot To: linux-kernel@vger.kernel.org, purvayeshi550@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in ppp_sync_send ===================================================== BUG: KMSAN: uninit-value in ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:517 [inline] BUG: KMSAN: uninit-value in ppp_sync_send+0x21c/0xb00 drivers/net/ppp/ppp_synctty.c:569 ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:517 [inline] ppp_sync_send+0x21c/0xb00 drivers/net/ppp/ppp_synctty.c:569 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+0xb35/0xc50 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x903/0xb60 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 created at: slab_post_alloc_hook mm/slub.c:4121 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1331 [inline] sock_wmalloc+0xfe/0x1a0 net/core/sock.c:2746 pppoe_sendmsg+0x385/0xc50 drivers/net/ppp/pppoe.c:867 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x903/0xb60 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 CPU: 1 UID: 0 PID: 6825 Comm: syz.0.16 Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ===================================================== Tested on: commit: 49665900 Merge tag 'i2c-for-6.14-rc3' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1177e7df980000 kernel config: https://syzkaller.appspot.com/x/.config?x=92e8820bdc5f2bf2 dashboard link: https://syzkaller.appspot.com/bug?extid=29fc8991b0ecb186cf40 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=14dacbf8580000