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AJvYcCU0AFN2BPrPSB2AoaN7TfDvRflJ1xKoq1AERtWan9dRCCyU79ZK1TjHOmtaDMcXVSSIamT2Fsg=@vger.kernel.org X-Gm-Message-State: AOJu0YzJbJxGPhaRTc5brBKIYzkfL8cdJvNzA5kXyJXd8J4/95rj5ziF rdgPp/rceKbx8LypCJgcHDaxx0+P2ZoEAAI8ti5YLr4H6XtZMVLiSKjtJoRUtntqZUslQ3Rxcrm u0rnA0+n7JOm4HsJD6d4i0sIfQ0ZGe2mtBt+lt1hTUykEbJDhPCE8MjwJVQY= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2107:b0:66b:2d47:a773 with SMTP id 006d021491bc7-66ba7d810c4mr2942377eaf.36.1770375769897; Fri, 06 Feb 2026 03:02:49 -0800 (PST) Date: Fri, 06 Feb 2026 03:02:49 -0800 In-Reply-To: <20260206055113.63476-1-yangfeng59949@163.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6985ca59.050a0220.3b3015.003c.GAE@google.com> Subject: [syzbot ci] Re: bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap From: syzbot ci To: bpf@vger.kernel.org, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, yangfeng59949@163.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v3] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap https://lore.kernel.org/all/20260206055113.63476-1-yangfeng59949@163.com * [PATCH v3] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap and found the following issue: WARNING in skb_dst_set_noref Full report is available here: https://ci.syzbot.org/series/ebdff606-6251-4db9-ab50-448f5433094a *** WARNING in skb_dst_set_noref tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 1ace9bac1ad2bc6a0a70baaa16d22b7e783e88c5 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/673700c1-fa90-4aa2-8342-e6b397961829/config C repro: https://ci.syzbot.org/findings/ad5a5f81-3d84-45ac-90ec-9a169eb16405/c_repro syz repro: https://ci.syzbot.org/findings/ad5a5f81-3d84-45ac-90ec-9a169eb16405/syz_repro ------------[ cut here ]------------ !rcu_read_lock_held() && !rcu_read_lock_bh_held() WARNING: ./include/linux/skbuff.h:1235 at skb_dst_set_noref+0x14a/0x1a0 include/linux/skbuff.h:1235, CPU#1: syz.0.17/5979 Modules linked in: CPU: 1 UID: 0 PID: 5979 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:skb_dst_set_noref+0x14a/0x1a0 include/linux/skbuff.h:1235 Code: 5d 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9b 80 e9 01 cc e8 95 58 30 f8 90 0f 0b 90 e9 2f ff ff ff e8 87 58 30 f8 90 <0f> 0b 90 e9 5d ff ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 76 ff ff ff RSP: 0018:ffffc90004487a20 EFLAGS: 00010293 RAX: ffffffff89923f99 RBX: ffffc90004487ba0 RCX: ffff888103713a80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffc90004487be3 R09: 1ffff92000890f7c R10: dffffc0000000000 R11: fffff52000890f7d R12: 0000000000000000 R13: ffff88817331d858 R14: 1ffff1102e663b0b R15: ffff88817331d800 FS: 0000555590ae6500(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb63fff CR3: 00000001139cc000 CR4: 00000000000006f0 Call Trace: bpf_prog_test_run_skb+0xed8/0x1eb0 net/bpf/test_run.c:1164 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f21c579acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4c8461d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f21c5a15fa0 RCX: 00007f21c579acb9 RDX: 0000000000000050 RSI: 0000200000000780 RDI: 000000000000000a RBP: 00007f21c5808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f21c5a15fac R14: 00007f21c5a15fa0 R15: 00007f21c5a15fa0 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.