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Date: Fri, 21 Aug 2020 20:28:59 +0800
From: kernel test robot <lkp@...el.com>
To: Tom Parkin <tparkin@...alix.com>, netdev@...r.kernel.org
Cc: kbuild-all@...ts.01.org, jchapman@...alix.com,
Tom Parkin <tparkin@...alix.com>
Subject: Re: [PATCH 1/9] l2tp: don't log data frames
Hi Tom,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Tom-Parkin/l2tp-replace-custom-logging-code-with-tracepoints/20200821-184919
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git d0a84e1f38d9d6ae2dfab0b6c2407d667a265aa5
config: riscv-randconfig-r035-20200820 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
net/l2tp/l2tp_core.c: In function 'l2tp_recv_common':
>> net/l2tp/l2tp_core.c:663:14: warning: variable 'nr' set but not used [-Wunused-but-set-variable]
663 | u32 ns = 0, nr = 0;
| ^~
# https://github.com/0day-ci/linux/commit/5b9d9c3057638c81876e600aa2210e4a3e35fa8d
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Tom-Parkin/l2tp-replace-custom-logging-code-with-tracepoints/20200821-184919
git checkout 5b9d9c3057638c81876e600aa2210e4a3e35fa8d
vim +/nr +663 net/l2tp/l2tp_core.c
b6dc01a43aaca24 James Chapman 2013-07-02 598
f7faffa3ff8ef6a James Chapman 2010-04-02 599 /* Do receive processing of L2TP data frames. We handle both L2TPv2
f7faffa3ff8ef6a James Chapman 2010-04-02 600 * and L2TPv3 data frames here.
f7faffa3ff8ef6a James Chapman 2010-04-02 601 *
f7faffa3ff8ef6a James Chapman 2010-04-02 602 * L2TPv2 Data Message Header
f7faffa3ff8ef6a James Chapman 2010-04-02 603 *
f7faffa3ff8ef6a James Chapman 2010-04-02 604 * 0 1 2 3
f7faffa3ff8ef6a James Chapman 2010-04-02 605 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
f7faffa3ff8ef6a James Chapman 2010-04-02 606 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 607 * |T|L|x|x|S|x|O|P|x|x|x|x| Ver | Length (opt) |
f7faffa3ff8ef6a James Chapman 2010-04-02 608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 609 * | Tunnel ID | Session ID |
f7faffa3ff8ef6a James Chapman 2010-04-02 610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 611 * | Ns (opt) | Nr (opt) |
f7faffa3ff8ef6a James Chapman 2010-04-02 612 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 613 * | Offset Size (opt) | Offset pad... (opt)
f7faffa3ff8ef6a James Chapman 2010-04-02 614 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 615 *
f7faffa3ff8ef6a James Chapman 2010-04-02 616 * Data frames are marked by T=0. All other fields are the same as
f7faffa3ff8ef6a James Chapman 2010-04-02 617 * those in L2TP control frames.
f7faffa3ff8ef6a James Chapman 2010-04-02 618 *
f7faffa3ff8ef6a James Chapman 2010-04-02 619 * L2TPv3 Data Message Header
f7faffa3ff8ef6a James Chapman 2010-04-02 620 *
f7faffa3ff8ef6a James Chapman 2010-04-02 621 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 622 * | L2TP Session Header |
f7faffa3ff8ef6a James Chapman 2010-04-02 623 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 624 * | L2-Specific Sublayer |
f7faffa3ff8ef6a James Chapman 2010-04-02 625 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 626 * | Tunnel Payload ...
f7faffa3ff8ef6a James Chapman 2010-04-02 627 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 628 *
f7faffa3ff8ef6a James Chapman 2010-04-02 629 * L2TPv3 Session Header Over IP
f7faffa3ff8ef6a James Chapman 2010-04-02 630 *
f7faffa3ff8ef6a James Chapman 2010-04-02 631 * 0 1 2 3
f7faffa3ff8ef6a James Chapman 2010-04-02 632 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
f7faffa3ff8ef6a James Chapman 2010-04-02 633 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 634 * | Session ID |
f7faffa3ff8ef6a James Chapman 2010-04-02 635 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 636 * | Cookie (optional, maximum 64 bits)...
f7faffa3ff8ef6a James Chapman 2010-04-02 637 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 638 * |
f7faffa3ff8ef6a James Chapman 2010-04-02 639 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 640 *
f7faffa3ff8ef6a James Chapman 2010-04-02 641 * L2TPv3 L2-Specific Sublayer Format
f7faffa3ff8ef6a James Chapman 2010-04-02 642 *
f7faffa3ff8ef6a James Chapman 2010-04-02 643 * 0 1 2 3
f7faffa3ff8ef6a James Chapman 2010-04-02 644 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
f7faffa3ff8ef6a James Chapman 2010-04-02 645 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 646 * |x|S|x|x|x|x|x|x| Sequence Number |
f7faffa3ff8ef6a James Chapman 2010-04-02 647 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
f7faffa3ff8ef6a James Chapman 2010-04-02 648 *
23fe846f9a48d53 Guillaume Nault 2018-01-05 649 * Cookie value and sublayer format are negotiated with the peer when
23fe846f9a48d53 Guillaume Nault 2018-01-05 650 * the session is set up. Unlike L2TPv2, we do not need to parse the
23fe846f9a48d53 Guillaume Nault 2018-01-05 651 * packet header to determine if optional fields are present.
f7faffa3ff8ef6a James Chapman 2010-04-02 652 *
f7faffa3ff8ef6a James Chapman 2010-04-02 653 * Caller must already have parsed the frame and determined that it is
f7faffa3ff8ef6a James Chapman 2010-04-02 654 * a data (not control) frame before coming here. Fields up to the
f7faffa3ff8ef6a James Chapman 2010-04-02 655 * session-id have already been parsed and ptr points to the data
f7faffa3ff8ef6a James Chapman 2010-04-02 656 * after the session-id.
fd558d186df2c13 James Chapman 2010-04-02 657 */
f7faffa3ff8ef6a James Chapman 2010-04-02 658 void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
f7faffa3ff8ef6a James Chapman 2010-04-02 659 unsigned char *ptr, unsigned char *optr, u16 hdrflags,
2b139e6b1ec86e1 Guillaume Nault 2018-07-25 660 int length)
fd558d186df2c13 James Chapman 2010-04-02 661 {
f7faffa3ff8ef6a James Chapman 2010-04-02 662 struct l2tp_tunnel *tunnel = session->tunnel;
95075150d0bdaa7 Tom Parkin 2020-07-24 @663 u32 ns = 0, nr = 0;
fd558d186df2c13 James Chapman 2010-04-02 664 int offset;
fd558d186df2c13 James Chapman 2010-04-02 665
f7faffa3ff8ef6a James Chapman 2010-04-02 666 /* Parse and check optional cookie */
f7faffa3ff8ef6a James Chapman 2010-04-02 667 if (session->peer_cookie_len > 0) {
f7faffa3ff8ef6a James Chapman 2010-04-02 668 if (memcmp(ptr, &session->peer_cookie[0], session->peer_cookie_len)) {
a4ca44fa578c7c7 Joe Perches 2012-05-16 669 l2tp_info(tunnel, L2TP_MSG_DATA,
f7faffa3ff8ef6a James Chapman 2010-04-02 670 "%s: cookie mismatch (%u/%u). Discarding.\n",
a4ca44fa578c7c7 Joe Perches 2012-05-16 671 tunnel->name, tunnel->tunnel_id,
a4ca44fa578c7c7 Joe Perches 2012-05-16 672 session->session_id);
7b7c0719cd7afee Tom Parkin 2013-03-19 673 atomic_long_inc(&session->stats.rx_cookie_discards);
f7faffa3ff8ef6a James Chapman 2010-04-02 674 goto discard;
f7faffa3ff8ef6a James Chapman 2010-04-02 675 }
f7faffa3ff8ef6a James Chapman 2010-04-02 676 ptr += session->peer_cookie_len;
f7faffa3ff8ef6a James Chapman 2010-04-02 677 }
f7faffa3ff8ef6a James Chapman 2010-04-02 678
fd558d186df2c13 James Chapman 2010-04-02 679 /* Handle the optional sequence numbers. Sequence numbers are
fd558d186df2c13 James Chapman 2010-04-02 680 * in different places for L2TPv2 and L2TPv3.
fd558d186df2c13 James Chapman 2010-04-02 681 *
fd558d186df2c13 James Chapman 2010-04-02 682 * If we are the LAC, enable/disable sequence numbers under
fd558d186df2c13 James Chapman 2010-04-02 683 * the control of the LNS. If no sequence numbers present but
fd558d186df2c13 James Chapman 2010-04-02 684 * we were expecting them, discard frame.
fd558d186df2c13 James Chapman 2010-04-02 685 */
fd558d186df2c13 James Chapman 2010-04-02 686 L2TP_SKB_CB(skb)->has_seq = 0;
f7faffa3ff8ef6a James Chapman 2010-04-02 687 if (tunnel->version == L2TP_HDR_VER_2) {
fd558d186df2c13 James Chapman 2010-04-02 688 if (hdrflags & L2TP_HDRFLAG_S) {
f7faffa3ff8ef6a James Chapman 2010-04-02 689 ns = ntohs(*(__be16 *)ptr);
fd558d186df2c13 James Chapman 2010-04-02 690 ptr += 2;
fd558d186df2c13 James Chapman 2010-04-02 691 nr = ntohs(*(__be16 *)ptr);
fd558d186df2c13 James Chapman 2010-04-02 692 ptr += 2;
fd558d186df2c13 James Chapman 2010-04-02 693
fd558d186df2c13 James Chapman 2010-04-02 694 /* Store L2TP info in the skb */
fd558d186df2c13 James Chapman 2010-04-02 695 L2TP_SKB_CB(skb)->ns = ns;
fd558d186df2c13 James Chapman 2010-04-02 696 L2TP_SKB_CB(skb)->has_seq = 1;
fd558d186df2c13 James Chapman 2010-04-02 697 }
f7faffa3ff8ef6a James Chapman 2010-04-02 698 } else if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) {
f7faffa3ff8ef6a James Chapman 2010-04-02 699 u32 l2h = ntohl(*(__be32 *)ptr);
f7faffa3ff8ef6a James Chapman 2010-04-02 700
f7faffa3ff8ef6a James Chapman 2010-04-02 701 if (l2h & 0x40000000) {
f7faffa3ff8ef6a James Chapman 2010-04-02 702 ns = l2h & 0x00ffffff;
f7faffa3ff8ef6a James Chapman 2010-04-02 703
f7faffa3ff8ef6a James Chapman 2010-04-02 704 /* Store L2TP info in the skb */
f7faffa3ff8ef6a James Chapman 2010-04-02 705 L2TP_SKB_CB(skb)->ns = ns;
f7faffa3ff8ef6a James Chapman 2010-04-02 706 L2TP_SKB_CB(skb)->has_seq = 1;
f7faffa3ff8ef6a James Chapman 2010-04-02 707 }
62e7b6a57c7b9bf Lorenzo Bianconi 2018-01-16 708 ptr += 4;
f7faffa3ff8ef6a James Chapman 2010-04-02 709 }
f7faffa3ff8ef6a James Chapman 2010-04-02 710
fd558d186df2c13 James Chapman 2010-04-02 711 if (L2TP_SKB_CB(skb)->has_seq) {
20dcb1107ab1a34 Tom Parkin 2020-07-22 712 /* Received a packet with sequence numbers. If we're the LAC,
fd558d186df2c13 James Chapman 2010-04-02 713 * check if we sre sending sequence numbers and if not,
fd558d186df2c13 James Chapman 2010-04-02 714 * configure it so.
fd558d186df2c13 James Chapman 2010-04-02 715 */
6c0ec37b8283463 Tom Parkin 2020-07-23 716 if (!session->lns_mode && !session->send_seq) {
a4ca44fa578c7c7 Joe Perches 2012-05-16 717 l2tp_info(session, L2TP_MSG_SEQ,
fd558d186df2c13 James Chapman 2010-04-02 718 "%s: requested to enable seq numbers by LNS\n",
fd558d186df2c13 James Chapman 2010-04-02 719 session->name);
3f9b9770b479986 Asbjørn Sloth Tønnesen 2016-11-07 720 session->send_seq = 1;
f7faffa3ff8ef6a James Chapman 2010-04-02 721 l2tp_session_set_header_len(session, tunnel->version);
fd558d186df2c13 James Chapman 2010-04-02 722 }
fd558d186df2c13 James Chapman 2010-04-02 723 } else {
fd558d186df2c13 James Chapman 2010-04-02 724 /* No sequence numbers.
fd558d186df2c13 James Chapman 2010-04-02 725 * If user has configured mandatory sequence numbers, discard.
fd558d186df2c13 James Chapman 2010-04-02 726 */
fd558d186df2c13 James Chapman 2010-04-02 727 if (session->recv_seq) {
a4ca44fa578c7c7 Joe Perches 2012-05-16 728 l2tp_warn(session, L2TP_MSG_SEQ,
a4ca44fa578c7c7 Joe Perches 2012-05-16 729 "%s: recv data has no seq numbers when required. Discarding.\n",
a4ca44fa578c7c7 Joe Perches 2012-05-16 730 session->name);
7b7c0719cd7afee Tom Parkin 2013-03-19 731 atomic_long_inc(&session->stats.rx_seq_discards);
fd558d186df2c13 James Chapman 2010-04-02 732 goto discard;
fd558d186df2c13 James Chapman 2010-04-02 733 }
fd558d186df2c13 James Chapman 2010-04-02 734
fd558d186df2c13 James Chapman 2010-04-02 735 /* If we're the LAC and we're sending sequence numbers, the
fd558d186df2c13 James Chapman 2010-04-02 736 * LNS has requested that we no longer send sequence numbers.
fd558d186df2c13 James Chapman 2010-04-02 737 * If we're the LNS and we're sending sequence numbers, the
fd558d186df2c13 James Chapman 2010-04-02 738 * LAC is broken. Discard the frame.
fd558d186df2c13 James Chapman 2010-04-02 739 */
6c0ec37b8283463 Tom Parkin 2020-07-23 740 if (!session->lns_mode && session->send_seq) {
a4ca44fa578c7c7 Joe Perches 2012-05-16 741 l2tp_info(session, L2TP_MSG_SEQ,
fd558d186df2c13 James Chapman 2010-04-02 742 "%s: requested to disable seq numbers by LNS\n",
fd558d186df2c13 James Chapman 2010-04-02 743 session->name);
fd558d186df2c13 James Chapman 2010-04-02 744 session->send_seq = 0;
f7faffa3ff8ef6a James Chapman 2010-04-02 745 l2tp_session_set_header_len(session, tunnel->version);
fd558d186df2c13 James Chapman 2010-04-02 746 } else if (session->send_seq) {
a4ca44fa578c7c7 Joe Perches 2012-05-16 747 l2tp_warn(session, L2TP_MSG_SEQ,
a4ca44fa578c7c7 Joe Perches 2012-05-16 748 "%s: recv data has no seq numbers when required. Discarding.\n",
a4ca44fa578c7c7 Joe Perches 2012-05-16 749 session->name);
7b7c0719cd7afee Tom Parkin 2013-03-19 750 atomic_long_inc(&session->stats.rx_seq_discards);
fd558d186df2c13 James Chapman 2010-04-02 751 goto discard;
fd558d186df2c13 James Chapman 2010-04-02 752 }
fd558d186df2c13 James Chapman 2010-04-02 753 }
fd558d186df2c13 James Chapman 2010-04-02 754
900631ee6a2651d James Chapman 2018-01-03 755 /* Session data offset is defined only for L2TPv2 and is
900631ee6a2651d James Chapman 2018-01-03 756 * indicated by an optional 16-bit value in the header.
f7faffa3ff8ef6a James Chapman 2010-04-02 757 */
f7faffa3ff8ef6a James Chapman 2010-04-02 758 if (tunnel->version == L2TP_HDR_VER_2) {
fd558d186df2c13 James Chapman 2010-04-02 759 /* If offset bit set, skip it. */
fd558d186df2c13 James Chapman 2010-04-02 760 if (hdrflags & L2TP_HDRFLAG_O) {
fd558d186df2c13 James Chapman 2010-04-02 761 offset = ntohs(*(__be16 *)ptr);
fd558d186df2c13 James Chapman 2010-04-02 762 ptr += 2 + offset;
fd558d186df2c13 James Chapman 2010-04-02 763 }
900631ee6a2651d James Chapman 2018-01-03 764 }
fd558d186df2c13 James Chapman 2010-04-02 765
fd558d186df2c13 James Chapman 2010-04-02 766 offset = ptr - optr;
fd558d186df2c13 James Chapman 2010-04-02 767 if (!pskb_may_pull(skb, offset))
fd558d186df2c13 James Chapman 2010-04-02 768 goto discard;
fd558d186df2c13 James Chapman 2010-04-02 769
fd558d186df2c13 James Chapman 2010-04-02 770 __skb_pull(skb, offset);
fd558d186df2c13 James Chapman 2010-04-02 771
fd558d186df2c13 James Chapman 2010-04-02 772 /* Prepare skb for adding to the session's reorder_q. Hold
fd558d186df2c13 James Chapman 2010-04-02 773 * packets for max reorder_timeout or 1 second if not
fd558d186df2c13 James Chapman 2010-04-02 774 * reordering.
fd558d186df2c13 James Chapman 2010-04-02 775 */
fd558d186df2c13 James Chapman 2010-04-02 776 L2TP_SKB_CB(skb)->length = length;
fd558d186df2c13 James Chapman 2010-04-02 777 L2TP_SKB_CB(skb)->expires = jiffies +
fd558d186df2c13 James Chapman 2010-04-02 778 (session->reorder_timeout ? session->reorder_timeout : HZ);
fd558d186df2c13 James Chapman 2010-04-02 779
fd558d186df2c13 James Chapman 2010-04-02 780 /* Add packet to the session's receive queue. Reordering is done here, if
fd558d186df2c13 James Chapman 2010-04-02 781 * enabled. Saved L2TP protocol info is stored in skb->sb[].
fd558d186df2c13 James Chapman 2010-04-02 782 */
fd558d186df2c13 James Chapman 2010-04-02 783 if (L2TP_SKB_CB(skb)->has_seq) {
b6dc01a43aaca24 James Chapman 2013-07-02 784 if (l2tp_recv_data_seq(session, skb))
fd558d186df2c13 James Chapman 2010-04-02 785 goto discard;
fd558d186df2c13 James Chapman 2010-04-02 786 } else {
fd558d186df2c13 James Chapman 2010-04-02 787 /* No sequence numbers. Add the skb to the tail of the
fd558d186df2c13 James Chapman 2010-04-02 788 * reorder queue. This ensures that it will be
fd558d186df2c13 James Chapman 2010-04-02 789 * delivered after all previous sequenced skbs.
fd558d186df2c13 James Chapman 2010-04-02 790 */
fd558d186df2c13 James Chapman 2010-04-02 791 skb_queue_tail(&session->reorder_q, skb);
fd558d186df2c13 James Chapman 2010-04-02 792 }
fd558d186df2c13 James Chapman 2010-04-02 793
fd558d186df2c13 James Chapman 2010-04-02 794 /* Try to dequeue as many skbs from reorder_q as we can. */
fd558d186df2c13 James Chapman 2010-04-02 795 l2tp_recv_dequeue(session);
fd558d186df2c13 James Chapman 2010-04-02 796
f7faffa3ff8ef6a James Chapman 2010-04-02 797 return;
fd558d186df2c13 James Chapman 2010-04-02 798
fd558d186df2c13 James Chapman 2010-04-02 799 discard:
7b7c0719cd7afee Tom Parkin 2013-03-19 800 atomic_long_inc(&session->stats.rx_errors);
fd558d186df2c13 James Chapman 2010-04-02 801 kfree_skb(skb);
f7faffa3ff8ef6a James Chapman 2010-04-02 802 }
ca7885dbcd899e6 Tom Parkin 2020-07-28 803 EXPORT_SYMBOL_GPL(l2tp_recv_common);
f7faffa3ff8ef6a James Chapman 2010-04-02 804
---
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