From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD8292A1CA for ; Fri, 26 Sep 2025 21:16:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758921397; cv=none; b=oK5bJJQprlknnE/N9yllIVVITNHLg8ICH/4Lks73HsTah3u6VqNMC0u0tREt1fAo/3uVq1tto1ktqRlCXcbs31taucTgGIOozyVdWiuJJvlNRUhuPONeJBl312wqQzxivPx52i0uWoUR53EUdCGSTvX9S95qd3so8WdVS5H8xDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758921397; c=relaxed/simple; bh=YVZfcSmxltQN/FAcBPyerMu3TngKU7z3AmgGKIZYpB0=; h=MIME-Version:Date:Message-ID:Subject:From:To:Cc:Content-Type; b=srvB9dmwXGCCVmY/yn2YOO5A45Hxeg0+JOQxwjK+9I9yf5EwSbdqWXieeZhN6ym+4romhMRL0/dj4nD24TxDFKOsBAxOLOz4zEWRfQEUZQHjj2HkQUckhP5HvP0UAkAyyNMhYtCf6kprhO+9KeRDNCdKm4hc6L4nCE9Wf/vKVcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f198.google.com with SMTP id e9e14a558f8ab-42590870dc0so68409065ab.3 for ; Fri, 26 Sep 2025 14:16:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758921395; x=1759526195; h=content-transfer-encoding:cc:to:from:subject:message-id:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=zM5X76JDZCf7K5+lyV4aaLKSZuGlvi+KfuIpetv8UcI=; b=fQp0+t8VEz0AKaKEYjraU4BzCY63B1l1McmjC6P1T6OZr3FxX+ByYgzsdgsPm3E1iD GWUNdlfe3At514VUqOzyrq9AXsC4YWCR1MPEtwVZ28CiW1eBZoHsmAOsngcWmyjLC6jK k4tGofG/VcpPYtLaRVqn7c4KHJuSRsTAtCmIzki+o2b5mrSqEOUR/PITFnV1zNQgbQQB shHjTdHrjv1SxoxX/GbPptt6OeZ7VwoAA5xNQo9he5NrK1lHzggRdo2uxmisniKOr+Ey U87gS2DRQmQ/5Up9tLs/OcNIkYwHqpcntBFZG4dw6AzITowa3AwoKezPOVKeYtrdn3wI 6L4Q== X-Gm-Message-State: AOJu0YzTIPUj5l2ahoE5/enEKrwXGUGaSJ6JGa3krG07Z6wJ2khRL920 rtEUlcsoopqvZ24bw2uYG7liFYjQzuq8t1J1sGYTvorBNuYjdJbHxcWCC0oTrMeIBCNNfwcf7Rc gVzM4AE5awHkkH73L5aY3NtydD+PhsjwYMF1KImcV/ubl3BrX0pN3PXSqgB4= X-Google-Smtp-Source: AGHT+IHMeZVD2pHYtfi4PLS3xeTTTla/jI6NQ1yvjdqbZ1pH/G+7glBAnhp/gtSJmwGHi73h6cf5WdfCRqsXZMWg2JdmRMUWRy+r Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:19ce:b0:425:7730:61b5 with SMTP id e9e14a558f8ab-425955ca97cmr139110465ab.4.1758921394977; Fri, 26 Sep 2025 14:16:34 -0700 (PDT) Date: Fri, 26 Sep 2025 14:16:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d702b2.050a0220.25d7ab.01c0.GAE@google.com> Subject: [moderation/CI] Re: net: devmem: improve cpu cost of RX token management From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v4] net: devmem: improve cpu cost of RX token management https://lore.kernel.org/all/20250926-scratch-bobbyeshleman-devmem-tcp-token= -upstream-v4-0-39156563c3ea@meta.com * [PATCH net-next v4 1/2] net: devmem: rename tx_vec to vec in dmabuf bindi= ng * [PATCH net-next v4 2/2] net: devmem: use niov array for token management and found the following issue: general protection fault in sock_devmem_dontneed Full report is available here: https://ci.syzbot.org/series/b8209bd4-e9f0-4c54-bad3-613e8431151b *** general protection fault in sock_devmem_dontneed tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/= net-next.git base: dc1dea796b197aba2c3cae25bfef45f4b3ad46fe arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp= 1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/b4d90fd9-9fbe-4e17-8fc0-3d6603df09d= a/config C repro: https://ci.syzbot.org/findings/ce81b3c3-3db8-4643-9731-cbe331c65= fdb/c_repro syz repro: https://ci.syzbot.org/findings/ce81b3c3-3db8-4643-9731-cbe331c65= fdb/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc= 0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5996 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:sock_devmem_dontneed+0x372/0x920 net/core/sock.c:1113 Code: 48 44 8b 20 44 89 74 24 54 45 01 f4 48 8b 44 24 60 42 80 3c 28 00 74 = 08 48 89 df e8 e8 5a c9 f8 4c 8b 33 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 7= 4 08 4c 89 f7 e8 cf 5a c9 f8 4d 8b 3e 4c 89 f8 48 RSP: 0018:ffffc90002a1fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88810a8ab710 RCX: 1ffff11023002f45 RDX: ffff88801b339cc0 RSI: 0000000000002000 RDI: 0000000000000000 RBP: ffffc90002a1fc50 R08: ffffc90002a1fbdf R09: 0000000000000000 R10: ffffc90002a1fb60 R11: fffff52000543f7c R12: 0000000000f07000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810a8ab710 FS: 000055556f85a500(0000) GS:ffff8881a3c3d000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000a2000 CR3: 0000000024516000 CR4: 00000000000006f0 Call Trace: sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1304 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fea0438ec29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 f= f 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd04a8f368 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fea045d5fa0 RCX: 00007fea0438ec29 RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007fea04411e41 R08: 0000000000000010 R09: 0000000000000000 R10: 00002000000a2000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fea045d5fa0 R14: 00007fea045d5fa0 R15: 0000000000000005 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sock_devmem_dontneed+0x372/0x920 net/core/sock.c:1113 Code: 48 44 8b 20 44 89 74 24 54 45 01 f4 48 8b 44 24 60 42 80 3c 28 00 74 = 08 48 89 df e8 e8 5a c9 f8 4c 8b 33 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 7= 4 08 4c 89 f7 e8 cf 5a c9 f8 4d 8b 3e 4c 89 f8 48 RSP: 0018:ffffc90002a1fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88810a8ab710 RCX: 1ffff11023002f45 RDX: ffff88801b339cc0 RSI: 0000000000002000 RDI: 0000000000000000 RBP: ffffc90002a1fc50 R08: ffffc90002a1fbdf R09: 0000000000000000 R10: ffffc90002a1fb60 R11: fffff52000543f7c R12: 0000000000f07000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810a8ab710 FS: 000055556f85a500(0000) GS:ffff8881a3c3d000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000a2000 CR3: 0000000024516000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 48 rex.W 1: 44 8b 20 mov (%rax),%r12d 4: 44 89 74 24 54 mov %r14d,0x54(%rsp) 9: 45 01 f4 add %r14d,%r12d c: 48 8b 44 24 60 mov 0x60(%rsp),%rax 11: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 e8 5a c9 f8 call 0xf8c95b08 20: 4c 8b 33 mov (%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruct= ion 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 cf 5a c9 f8 call 0xf8c95b08 39: 4d 8b 3e mov (%r14),%r15 3c: 4c 89 f8 mov %r15,%rax 3f: 48 rex.W *** 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. The email will later be sent to: [almasrymina@google.com bobbyeshleman@gmail.com bobbyeshleman@meta.com dave= m@davemloft.net dsahern@kernel.org edumazet@google.com horms@kernel.org kub= a@kernel.org kuniyu@google.com linux-kernel@vger.kernel.org ncardwell@googl= e.com netdev@vger.kernel.org pabeni@redhat.com sdf@fomichev.me willemb@goog= le.com] If the report looks fine to you, reply with: #syz upstream