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AJvYcCVVWxj0NVPIVcQ0HMyKVR+X9oCQHthLRJNeBSsXgjEXQZO+3vL4HEVSrHFnY7G69924foJ02id0yTytCVc=@vger.kernel.org X-Gm-Message-State: AOJu0Ywic5AW1WVnSm97Utja1R1HvPdlhJM+noTm2jEQ15RjzRn0QBZy MRCJ7doMoB+6qEHcEBSIN38A2hbH3OVq1TuKAErBmk7ZiU8CrBr9gW0zQONQUv0d1M1EMeJUe1b ktTsOD/mzOBACuX5sF/7o/tt4hVDvOJTy6d62eqk2x4DyKSiPodQHppM1Ptw= X-Google-Smtp-Source: AGHT+IGeEo5gRzg6XyBLAyi+Vr1GdthS8LGLIfU+LPdUhTRw3vh3rH2LlCqcI3iErCRWUtOgiqZLODH3ezCexwPbpBPcCSduAWPk Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3981:b0:430:be92:b60d with SMTP id e9e14a558f8ab-4335f4413c5mr38635555ab.26.1762513081877; Fri, 07 Nov 2025 02:58:01 -0800 (PST) Date: Fri, 07 Nov 2025 02:58:01 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690dd0b9.a70a0220.22f260.003b.GAE@google.com> Subject: Re: [syzbot] [tipc?] KMSAN: uninit-value in tipc_rcv (2) From: syzbot To: hariconscious@gmail.com, linux-kernel@vger.kernel.org, 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 tipc_rcv tipc: Started in network mode tipc: Node identity a287e0d4fc68, cluster identity 4711 tipc: tipc_buf_acquire data len: 0 tipc: Enabled bearer , priority 0 ===================================================== BUG: KMSAN: uninit-value in tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132 tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132 tipc_l2_rcv_msg+0x213/0x320 net/tipc/bearer.c:668 __netif_receive_skb_list_ptype net/core/dev.c:6127 [inline] __netif_receive_skb_list_core+0x133e/0x16b0 net/core/dev.c:6169 __netif_receive_skb_list net/core/dev.c:6221 [inline] netif_receive_skb_list_internal+0xee7/0x1530 net/core/dev.c:6312 gro_normal_list include/net/gro.h:524 [inline] gro_flush_normal include/net/gro.h:532 [inline] napi_complete_done+0x3fb/0x7d0 net/core/dev.c:6681 napi_complete include/linux/netdevice.h:589 [inline] tun_get_user+0x5953/0x6d70 drivers/net/tun.c:1924 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999 do_iter_readv_writev+0x9e1/0xc20 fs/read_write.c:-1 vfs_writev+0x52a/0x1500 fs/read_write.c:1057 do_writev+0x1b5/0x580 fs/read_write.c:1103 __do_sys_writev fs/read_write.c:1171 [inline] __se_sys_writev fs/read_write.c:1168 [inline] __x64_sys_writev+0x99/0xf0 fs/read_write.c:1168 x64_sys_call+0x24b1/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:21 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4977 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_node_noprof+0x989/0x16b0 mm/slub.c:5332 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 napi_alloc_skb+0xc1/0x740 net/core/skbuff.c:812 napi_get_frags+0xab/0x250 net/core/gro.c:681 tun_napi_alloc_frags drivers/net/tun.c:1404 [inline] tun_get_user+0x1352/0x6d70 drivers/net/tun.c:1784 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999 do_iter_readv_writev+0x9e1/0xc20 fs/read_write.c:-1 vfs_writev+0x52a/0x1500 fs/read_write.c:1057 do_writev+0x1b5/0x580 fs/read_write.c:1103 __do_sys_writev fs/read_write.c:1171 [inline] __se_sys_writev fs/read_write.c:1168 [inline] __x64_sys_writev+0x99/0xf0 fs/read_write.c:1168 x64_sys_call+0x24b1/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:21 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 6569 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== Tested on: commit: 4a0c9b33 Merge tag 'probes-fixes-v6.18-rc4' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1365ca92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2901a6a99b67fbcc dashboard link: https://syzkaller.appspot.com/bug?extid=9a4fbb77c9d4aacd3388 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=13631114580000