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Mon, 01 Jul 2024 05:40:02 -0700 (PDT) Date: Mon, 01 Jul 2024 05:40:02 -0700 In-Reply-To: <20240701101742.15473-1-wojciech.gladysz@infogain.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000576bfa061c2ee53e@google.com> Subject: Re: [syzbot] [bpf?] [net?] KMSAN: uninit-value in bpf_prog_test_run_xdp From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, wojciech.gladysz@infogain.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 bpf_prog_test_run_xdp ===================================================== BUG: KMSAN: uninit-value in bpf_prog_test_run_xdp+0x175d/0x1a40 net/bpf/test_run.c:1287 bpf_prog_test_run_xdp+0x175d/0x1a40 net/bpf/test_run.c:1287 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was stored to memory at: bpf_test_run+0x52e/0xc30 bpf_prog_test_run_xdp+0xeaa/0x1a40 net/bpf/test_run.c:1277 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was stored to memory at: ___bpf_prog_run+0x58c4/0xe0f0 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2252 bpf_dispatcher_nop_func include/linux/bpf.h:1233 [inline] __bpf_prog_run include/linux/filter.h:667 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] bpf_test_run+0x43e/0xc30 net/bpf/test_run.c:423 bpf_prog_test_run_xdp+0xeaa/0x1a40 net/bpf/test_run.c:1277 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was stored to memory at: ___bpf_prog_run+0x9098/0xe0f0 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2252 bpf_dispatcher_nop_func include/linux/bpf.h:1233 [inline] __bpf_prog_run include/linux/filter.h:667 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] bpf_test_run+0x43e/0xc30 net/bpf/test_run.c:423 bpf_prog_test_run_xdp+0xeaa/0x1a40 net/bpf/test_run.c:1277 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4240 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5736 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Local variable stack created at: __bpf_prog_run512+0x45/0xe0 kernel/bpf/core.c:2252 bpf_dispatcher_nop_func include/linux/bpf.h:1233 [inline] __bpf_prog_run include/linux/filter.h:667 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] bpf_test_run+0x43e/0xc30 net/bpf/test_run.c:423 CPU: 0 PID: 5442 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller-00257-ge478cf26c556-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ===================================================== Tested on: commit: e478cf26 Merge branch 'bpf-fix-a-couple-of-test-failur.. git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux console output: https://syzkaller.appspot.com/x/log.txt?x=14d7871e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=e2599baf258ef795 dashboard link: https://syzkaller.appspot.com/bug?extid=6856926fbb5e9b794e5c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=162e5ed1980000