From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ua1-f69.google.com (mail-ua1-f69.google.com [209.85.222.69]) (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 D60773F99E5 for ; Thu, 28 May 2026 15:17:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779981434; cv=none; b=sIpcHHi02OIX1m6TGEfVt9dNpBOAWwJpp3s/VCBNKPIE62T9zfp9P4GYZiB/GwtrYttpVOYCxL1qrocHTergCfm8sJNJZC7CI5XLflG8xa5AqowozzfDF5AdxbqQevr2BCdFpwxGVOXfFCYODR4W8xUNDNx6QRmBsEguupBrizU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779981434; c=relaxed/simple; bh=Mf9P7+3YO6dQmOsXDAkZdfmgAUezXqwyWarTCLoGFFI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=cLLvkvtP0xpglbqa/cSWau75udWI9iXC02r+hLpz8N813jgSDUZD9xzF6My0nZ5q9+yUiOIqqC1yt+xDbcdBRtddhkgofB0ktLcmDsumcLei6Ko15rQyBJILHEPxr6NGHi8FDDDvMdhDdmVL0lOzSPzmfp/yeaY7W/VCcAxLfv0= 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=209.85.222.69 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-ua1-f69.google.com with SMTP id a1e0cc1a2514c-95cf2f6a8d6so16523319241.1 for ; Thu, 28 May 2026 08:17:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779981433; x=1780586233; h=content-transfer-encoding:cc:to:from:subject:message-id:in-reply-to :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=CXngJUdVOuklguo2NTYD3PyXbuAeIYe2ZNicuqEj31Q=; b=B5iQfbFE62tcAr8xd+U4m5rhTQ4ZGCFSpF90B3/DKe7pFoIG5LlU5zown3MGEU0X2m Z4PzwZx2bT8Bf4+LQYS18JktphckTLcG9DkcjG3E73jhbs8OLU8cBmdev+ElzHu31jyT /KxySjurkRV48Y3huTf+OeymNNslgNQy77m/UK57sXWs7aPciSexRiHwufZz2TTdFwUm 8U4ilyL80j1PeFNpNQcuq8IP37zWXGalTlAxlKM86svY+zhAaJJ0uECcc3mxCV29u10U acOBQ7/AFx+d1PwKPm+ogRVB+vGZ6jB1/O0g5S6yBUMisIXtErieB2ND2w+9FZ5RvKaH Gm9A== X-Forwarded-Encrypted: i=1; AFNElJ8YFlIRmiXGDV9YvfgDrwdK3eZOCBQRUdk+1rZ1GspYrw9RW7KXoD4uP1SET0CSy6cU/f7v460=@lists.linux.dev X-Gm-Message-State: AOJu0Yy7s5GzwhD/5+3ivHhdkQHMAr0SS9nZ/JmlahVB+cdWCXQbWK1D W/RO0nFHbZtImzlNZBWbcI7rJJkeTpnuCPULSX4R3jevJ/9i39PkfH1+aRsm4cJXKX/+tBTE1gm NrLMt8w16KGHTZX6+Iz6Vtl6tbX6tdPjyONfi+QQRd5XPQ8IVp6DqbozesZw= Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1523:b0:694:857a:5a78 with SMTP id 006d021491bc7-69dfa68505amr687296eaf.8.1779979629522; Thu, 28 May 2026 07:47:09 -0700 (PDT) Date: Thu, 28 May 2026 07:47:09 -0700 In-Reply-To: <6a18556d.99a1ea37.128423.003f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a18556d.e783d627.6395.005c.GAE@google.com> Subject: Re: Re: [moderation/CI] Re: netlink: fix skb refcount leak when dump start fails From: syzbot To: syzbot@syzkaller.appspotmail.com Cc: pimyn@google.com, syzbot@lists.linux.dev, syzkaller-upstream-moderation@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable >>>>>>>>>>> #syz upstream >>>>>>>>>> >>>>>>>>>> Failed to process the command. Contact syzkaller@googlegroups.co= m. >>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Thu, May 28, 2026 at 4:39=E2=80=AFPM syzbot ci >>>>>>>>>>> wrote: >>>>>>>>>>>> >>>>>>>>>>>> syzbot ci has tested the following series >>>>>>>>>>>> >>>>>>>>>>>> [v1] netlink: fix skb refcount leak when dump start fails >>>>>>>>>>>> https://lore.kernel.org/all/20260528073614.1169858-1-vulab@isc= as.ac.cn >>>>>>>>>>>> * [PATCH] netlink: fix skb refcount leak when dump start fails >>>>>>>>>>>> >>>>>>>>>>>> and found the following issues: >>>>>>>>>>>> * KASAN: slab-use-after-free Read in nl80211_prepare_wdev_dump >>>>>>>>>>>> * KASAN: slab-use-after-free Read in xfrm_dump_sa_done >>>>>>>>>>>> * KASAN: slab-use-after-free Write in sk_skb_reason_drop >>>>>>>>>>>> >>>>>>>>>>>> Full report is available here: >>>>>>>>>>>> https://ci.syzbot.org/series/8ed6f41d-0d02-4f1f-a7be-cc639c2b4= cfd >>>>>>>>>>>> >>>>>>>>>>>> *** >>>>>>>>>>>> >>>>>>>>>>>> KASAN: slab-use-after-free Read in nl80211_prepare_wdev_dump >>>>>>>>>>>> >>>>>>>>>>>> tree: net >>>>>>>>>>>> URL: https://kernel.googlesource.com/pub/scm/linux/kerne= l/git/netdev/net.git >>>>>>>>>>>> base: 18014147d3ee7831dce53fe65d7fc8d428b02552 >>>>>>>>>>>> arch: amd64 >>>>>>>>>>>> compiler: Debian clang version 21.1.8 (++20251221033036+2078d= a43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 >>>>>>>>>>>> config: https://ci.syzbot.org/builds/90c5185d-0dad-4c34-a56= 3-4253ebb12eb2/config >>>>>>>>>>>> syz repro: https://ci.syzbot.org/findings/0ad9835c-f631-4240-a= 3ad-2610bca3de33/syz_repro >>>>>>>>>>>> >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in __nlmsg_parse include/net/n= etlink.h:784 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in nlmsg_parse_deprecated incl= ude/net/netlink.h:830 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in nl80211_prepare_wdev_dump+0= x634/0x680 net/wireless/nl80211.c:1245 >>>>>>>>>>>> Read of size 4 at addr ffff88816e172d80 by task syz.0.17/5814 >>>>>>>>>>>> >>>>>>>>>>>> CPU: 1 UID: 0 PID: 5814 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 >>>>>>>>>>>> Call Trace: >>>>>>>>>>>> >>>>>>>>>>>> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 >>>>>>>>>>>> print_address_description+0x55/0x1e0 mm/kasan/report.c:378 >>>>>>>>>>>> print_report+0x58/0x70 mm/kasan/report.c:482 >>>>>>>>>>>> kasan_report+0x117/0x150 mm/kasan/report.c:595 >>>>>>>>>>>> __nlmsg_parse include/net/netlink.h:784 [inline] >>>>>>>>>>>> nlmsg_parse_deprecated include/net/netlink.h:830 [inline] >>>>>>>>>>>> nl80211_prepare_wdev_dump+0x634/0x680 net/wireless/nl80211.c:= 1245 >>>>>>>>>>>> nl80211_dump_station+0x186/0xdb0 net/wireless/nl80211.c:8216 >>>>>>>>>>>> genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1026 >>>>>>>>>>>> netlink_dump+0x702/0xe10 net/netlink/af_netlink.c:2325 >>>>>>>>>>>> netlink_recvmsg+0x690/0xa50 net/netlink/af_netlink.c:1976 >>>>>>>>>>>> sock_recvmsg_nosec net/socket.c:1137 [inline] >>>>>>>>>>>> sock_recvmsg+0x172/0x1b0 net/socket.c:1159 >>>>>>>>>>>> __sys_recvfrom+0x240/0x3c0 net/socket.c:2315 >>>>>>>>>>>> __do_sys_recvfrom net/socket.c:2330 [inline] >>>>>>>>>>>> __se_sys_recvfrom net/socket.c:2326 [inline] >>>>>>>>>>>> __x64_sys_recvfrom+0xde/0x100 net/socket.c:2326 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> RIP: 0033:0x7fd64155d68e >>>>>>>>>>>> Code: 08 0f 85 a5 a8 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 >>>>>>>>>>>> RSP: 002b:00007fd6424b5e88 EFLAGS: 00000246 ORIG_RAX: 00000000= 0000002d >>>>>>>>>>>> RAX: ffffffffffffffda RBX: 00007fd6424b76c0 RCX: 00007fd64155d= 68e >>>>>>>>>>>> RDX: 0000000000001000 RSI: 00007fd6424b6000 RDI: 0000000000000= 003 >>>>>>>>>>>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000= 000 >>>>>>>>>>>> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000= 003 >>>>>>>>>>>> R13: 00007fd6424b5f58 R14: 00007fd6424b6000 R15: 0000000000000= 000 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Allocated by task 5813: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> unpoison_slab_object mm/kasan/common.c:340 [inline] >>>>>>>>>>>> __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 >>>>>>>>>>>> kasan_slab_alloc include/linux/kasan.h:253 [inline] >>>>>>>>>>>> slab_post_alloc_hook mm/slub.c:4569 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4898 [inline] >>>>>>>>>>>> kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4950 >>>>>>>>>>>> kmalloc_reserve net/core/skbuff.c:613 [inline] >>>>>>>>>>>> __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 >>>>>>>>>>>> netlink_sendmsg+0x5d4/0xb40 net/netlink/af_netlink.c:1869 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 >>>>>>>>>>>> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 >>>>>>>>>>>> __sys_sendmsg net/socket.c:2784 [inline] >>>>>>>>>>>> __do_sys_sendmsg net/socket.c:2789 [inline] >>>>>>>>>>>> __se_sys_sendmsg net/socket.c:2787 [inline] >>>>>>>>>>>> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> Freed by task 5813: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 >>>>>>>>>>>> poison_slab_object mm/kasan/common.c:253 [inline] >>>>>>>>>>>> __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 >>>>>>>>>>>> kasan_slab_free include/linux/kasan.h:235 [inline] >>>>>>>>>>>> slab_free_hook mm/slub.c:2689 [inline] >>>>>>>>>>>> slab_free mm/slub.c:6250 [inline] >>>>>>>>>>>> kfree+0x1c5/0x640 mm/slub.c:6565 >>>>>>>>>>>> skb_kfree_head net/core/skbuff.c:1075 [inline] >>>>>>>>>>>> skb_free_head net/core/skbuff.c:1087 [inline] >>>>>>>>>>>> skb_release_data+0x828/0xa60 net/core/skbuff.c:1114 >>>>>>>>>>>> skb_release_all net/core/skbuff.c:1189 [inline] >>>>>>>>>>>> __kfree_skb+0x5d/0x210 net/core/skbuff.c:1203 >>>>>>>>>>>> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] >>>>>>>>>>>> netlink_unicast+0x764/0x8e0 net/netlink/af_netlink.c:1344 >>>>>>>>>>>> netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 >>>>>>>>>>>> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 >>>>>>>>>>>> __sys_sendmsg net/socket.c:2784 [inline] >>>>>>>>>>>> __do_sys_sendmsg net/socket.c:2789 [inline] >>>>>>>>>>>> __se_sys_sendmsg net/socket.c:2787 [inline] >>>>>>>>>>>> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the object at ffff88816e172d80 >>>>>>>>>>>> which belongs to the cache skbuff_small_head of size 704 >>>>>>>>>>>> The buggy address is located 0 bytes inside of >>>>>>>>>>>> freed 704-byte region [ffff88816e172d80, ffff88816e173040) >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the physical page: >>>>>>>>>>>> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0= pfn:0x16e170 >>>>>>>>>>>> head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 p= incount:0 >>>>>>>>>>>> flags: 0x57ff00000000040(head|node=3D1|zone=3D2|lastcpupid=3D0= x7ff) >>>>>>>>>>>> page_type: f5(slab) >>>>>>>>>>>> raw: 057ff00000000040 ffff888160415140 dead000000000100 dead00= 0000000122 >>>>>>>>>>>> raw: 0000000000000000 0000000800120012 00000000f5000000 000000= 0000000000 >>>>>>>>>>>> head: 057ff00000000040 ffff888160415140 dead000000000100 dead0= 00000000122 >>>>>>>>>>>> head: 0000000000000000 0000000800120012 00000000f5000000 00000= 00000000000 >>>>>>>>>>>> head: 057ff00000000002 ffffffffffffff01 00000000ffffffff 00000= 000ffffffff >>>>>>>>>>>> head: ffffffffffffffff 0000000000000000 00000000ffffffff 00000= 00000000004 >>>>>>>>>>>> page dumped because: kasan: bad access detected >>>>>>>>>>>> page_owner tracks the page as allocated >>>>>>>>>>>> page last allocated via order 2, migratetype Unmovable, gfp_ma= sk 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLO= C), pid 5530, tgid 5530 (sshd), ts 47735478218, free_ts 34702748767 >>>>>>>>>>>> set_page_owner include/linux/page_owner.h:32 [inline] >>>>>>>>>>>> post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858 >>>>>>>>>>>> prep_new_page mm/page_alloc.c:1866 [inline] >>>>>>>>>>>> get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 >>>>>>>>>>>> __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 >>>>>>>>>>>> alloc_slab_page mm/slub.c:3278 [inline] >>>>>>>>>>>> allocate_slab+0x77/0x660 mm/slub.c:3467 >>>>>>>>>>>> new_slab mm/slub.c:3525 [inline] >>>>>>>>>>>> refill_objects+0x339/0x3d0 mm/slub.c:7271 >>>>>>>>>>>> refill_sheaf mm/slub.c:2816 [inline] >>>>>>>>>>>> __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 >>>>>>>>>>>> alloc_from_pcs mm/slub.c:4749 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4883 [inline] >>>>>>>>>>>> kmem_cache_alloc_node_noprof+0x441/0x690 mm/slub.c:4950 >>>>>>>>>>>> kmalloc_reserve net/core/skbuff.c:613 [inline] >>>>>>>>>>>> __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 >>>>>>>>>>>> alloc_skb include/linux/skbuff.h:1383 [inline] >>>>>>>>>>>> __tcp_send_ack+0xae/0x4f0 net/ipv4/tcp_output.c:4473 >>>>>>>>>>>> tcp_cleanup_rbuf net/ipv4/tcp.c:1612 [inline] >>>>>>>>>>>> tcp_recvmsg_locked+0x2dfa/0x3720 net/ipv4/tcp.c:2916 >>>>>>>>>>>> tcp_recvmsg+0x205/0x7e0 net/ipv4/tcp.c:2945 >>>>>>>>>>>> sock_recvmsg_nosec net/socket.c:1137 [inline] >>>>>>>>>>>> sock_recvmsg+0x155/0x1b0 net/socket.c:1159 >>>>>>>>>>>> sock_read_iter+0x251/0x320 net/socket.c:1229 >>>>>>>>>>>> new_sync_read fs/read_write.c:493 [inline] >>>>>>>>>>>> vfs_read+0x582/0xa70 fs/read_write.c:574 >>>>>>>>>>>> ksys_read+0x150/0x270 fs/read_write.c:717 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> page last free pid 5059 tgid 5059 stack trace: >>>>>>>>>>>> reset_page_owner include/linux/page_owner.h:25 [inline] >>>>>>>>>>>> __free_pages_prepare mm/page_alloc.c:1402 [inline] >>>>>>>>>>>> __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 >>>>>>>>>>>> __slab_free+0x274/0x2c0 mm/slub.c:5612 >>>>>>>>>>>> qlink_free mm/kasan/quarantine.c:163 [inline] >>>>>>>>>>>> qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 >>>>>>>>>>>> kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 >>>>>>>>>>>> __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 >>>>>>>>>>>> kasan_slab_alloc include/linux/kasan.h:253 [inline] >>>>>>>>>>>> slab_post_alloc_hook mm/slub.c:4569 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4898 [inline] >>>>>>>>>>>> __do_kmalloc_node mm/slub.c:5294 [inline] >>>>>>>>>>>> __kvmalloc_node_noprof+0x4d7/0x8a0 mm/slub.c:6832 >>>>>>>>>>>> seq_buf_alloc fs/seq_file.c:39 [inline] >>>>>>>>>>>> seq_read_iter+0x202/0xe10 fs/seq_file.c:211 >>>>>>>>>>>> new_sync_read fs/read_write.c:493 [inline] >>>>>>>>>>>> vfs_read+0x582/0xa70 fs/read_write.c:574 >>>>>>>>>>>> ksys_read+0x150/0x270 fs/read_write.c:717 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> Memory state around the buggy address: >>>>>>>>>>>> ffff88816e172c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc f= c fc >>>>>>>>>>>> ffff88816e172d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> >ffff88816e172d80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb f= b fb >>>>>>>>>>>> ^ >>>>>>>>>>>> ffff88816e172e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb f= b fb >>>>>>>>>>>> ffff88816e172e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb f= b fb >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> *** >>>>>>>>>>>> >>>>>>>>>>>> KASAN: slab-use-after-free Read in xfrm_dump_sa_done >>>>>>>>>>>> >>>>>>>>>>>> tree: net >>>>>>>>>>>> URL: https://kernel.googlesource.com/pub/scm/linux/kerne= l/git/netdev/net.git >>>>>>>>>>>> base: 18014147d3ee7831dce53fe65d7fc8d428b02552 >>>>>>>>>>>> arch: amd64 >>>>>>>>>>>> compiler: Debian clang version 21.1.8 (++20251221033036+2078d= a43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 >>>>>>>>>>>> config: https://ci.syzbot.org/builds/90c5185d-0dad-4c34-a56= 3-4253ebb12eb2/config >>>>>>>>>>>> syz repro: https://ci.syzbot.org/findings/53579ff8-1479-4e0c-a= e08-2f1ea756ee1b/syz_repro >>>>>>>>>>>> >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in xfrm_dump_sa_done+0x54/0xd0= net/xfrm/xfrm_user.c:1491 >>>>>>>>>>>> Read of size 8 at addr ffff888167305398 by task syz.0.17/5812 >>>>>>>>>>>> >>>>>>>>>>>> CPU: 1 UID: 0 PID: 5812 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 >>>>>>>>>>>> Call Trace: >>>>>>>>>>>> >>>>>>>>>>>> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 >>>>>>>>>>>> print_address_description+0x55/0x1e0 mm/kasan/report.c:378 >>>>>>>>>>>> print_report+0x58/0x70 mm/kasan/report.c:482 >>>>>>>>>>>> kasan_report+0x117/0x150 mm/kasan/report.c:595 >>>>>>>>>>>> xfrm_dump_sa_done+0x54/0xd0 net/xfrm/xfrm_user.c:1491 >>>>>>>>>>>> netlink_release+0x12c8/0x1ad0 net/netlink/af_netlink.c:768 >>>>>>>>>>>> __sock_release net/socket.c:722 [inline] >>>>>>>>>>>> sock_close+0xc3/0x240 net/socket.c:1514 >>>>>>>>>>>> __fput+0x44f/0xa60 fs/file_table.c:510 >>>>>>>>>>>> task_work_run+0x1d9/0x270 kernel/task_work.c:233 >>>>>>>>>>>> resume_user_mode_work include/linux/resume_user_mode.h:50 [in= line] >>>>>>>>>>>> __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] >>>>>>>>>>>> exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 >>>>>>>>>>>> __exit_to_user_mode_prepare include/linux/irq-entry-common.h:= 207 [inline] >>>>>>>>>>>> syscall_exit_to_user_mode_prepare include/linux/irq-entry-com= mon.h:230 [inline] >>>>>>>>>>>> syscall_exit_to_user_mode include/linux/entry-common.h:318 [i= nline] >>>>>>>>>>>> do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> RIP: 0033:0x7fe50bf9ce59 >>>>>>>>>>>> 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:00007fff8a02cc38 EFLAGS: 00000246 ORIG_RAX: 00000000= 000001b4 >>>>>>>>>>>> RAX: 0000000000000000 RBX: 00007fe50c217da0 RCX: 00007fe50bf9c= e59 >>>>>>>>>>>> RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000= 003 >>>>>>>>>>>> RBP: 00007fe50c217da0 R08: 00007fe50c216038 R09: 0000000000000= 000 >>>>>>>>>>>> R10: 000000000003fdd4 R11: 0000000000000246 R12: 0000000000010= 018 >>>>>>>>>>>> R13: 00007fe50c215fac R14: 00007fe50c215fa8 R15: 00007fe50c215= fa0 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Allocated by task 5813: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> unpoison_slab_object mm/kasan/common.c:340 [inline] >>>>>>>>>>>> __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 >>>>>>>>>>>> kasan_slab_alloc include/linux/kasan.h:253 [inline] >>>>>>>>>>>> slab_post_alloc_hook mm/slub.c:4569 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4898 [inline] >>>>>>>>>>>> kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4950 >>>>>>>>>>>> __alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702 >>>>>>>>>>>> netlink_sendmsg+0x5d4/0xb40 net/netlink/af_netlink.c:1869 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 >>>>>>>>>>>> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 >>>>>>>>>>>> __sys_sendmsg net/socket.c:2784 [inline] >>>>>>>>>>>> __do_sys_sendmsg net/socket.c:2789 [inline] >>>>>>>>>>>> __se_sys_sendmsg net/socket.c:2787 [inline] >>>>>>>>>>>> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> Freed by task 5813: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 >>>>>>>>>>>> poison_slab_object mm/kasan/common.c:253 [inline] >>>>>>>>>>>> __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 >>>>>>>>>>>> kasan_slab_free include/linux/kasan.h:235 [inline] >>>>>>>>>>>> slab_free_hook mm/slub.c:2689 [inline] >>>>>>>>>>>> slab_free mm/slub.c:6250 [inline] >>>>>>>>>>>> kmem_cache_free+0x182/0x650 mm/slub.c:6377 >>>>>>>>>>>> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] >>>>>>>>>>>> netlink_unicast+0x764/0x8e0 net/netlink/af_netlink.c:1344 >>>>>>>>>>>> netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 >>>>>>>>>>>> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 >>>>>>>>>>>> __sys_sendmsg net/socket.c:2784 [inline] >>>>>>>>>>>> __do_sys_sendmsg net/socket.c:2789 [inline] >>>>>>>>>>>> __se_sys_sendmsg net/socket.c:2787 [inline] >>>>>>>>>>>> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the object at ffff888167305380 >>>>>>>>>>>> which belongs to the cache skbuff_head_cache of size 240 >>>>>>>>>>>> The buggy address is located 24 bytes inside of >>>>>>>>>>>> freed 240-byte region [ffff888167305380, ffff888167305470) >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the physical page: >>>>>>>>>>>> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0= pfn:0x167304 >>>>>>>>>>>> head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 p= incount:0 >>>>>>>>>>>> flags: 0x57ff00000000040(head|node=3D1|zone=3D2|lastcpupid=3D0= x7ff) >>>>>>>>>>>> page_type: f5(slab) >>>>>>>>>>>> raw: 057ff00000000040 ffff888160416dc0 dead000000000100 dead00= 0000000122 >>>>>>>>>>>> raw: 0000000000000000 0000000800150015 00000000f5000000 000000= 0000000000 >>>>>>>>>>>> head: 057ff00000000040 ffff888160416dc0 dead000000000100 dead0= 00000000122 >>>>>>>>>>>> head: 0000000000000000 0000000800150015 00000000f5000000 00000= 00000000000 >>>>>>>>>>>> head: 057ff00000000001 ffffffffffffff81 00000000ffffffff 00000= 000ffffffff >>>>>>>>>>>> head: ffffffffffffffff 0000000000000000 00000000ffffffff 00000= 00000000002 >>>>>>>>>>>> page dumped because: kasan: bad access detected >>>>>>>>>>>> page_owner tracks the page as allocated >>>>>>>>>>>> page last allocated via order 1, migratetype Unmovable, gfp_ma= sk 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NO= MEMALLOC), pid 5813, tgid 5812 (syz.0.17), ts 64859679564, free_ts 63312613= 640 >>>>>>>>>>>> set_page_owner include/linux/page_owner.h:32 [inline] >>>>>>>>>>>> post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858 >>>>>>>>>>>> prep_new_page mm/page_alloc.c:1866 [inline] >>>>>>>>>>>> get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 >>>>>>>>>>>> __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 >>>>>>>>>>>> alloc_slab_page mm/slub.c:3278 [inline] >>>>>>>>>>>> allocate_slab+0x77/0x660 mm/slub.c:3467 >>>>>>>>>>>> new_slab mm/slub.c:3525 [inline] >>>>>>>>>>>> refill_objects+0x339/0x3d0 mm/slub.c:7271 >>>>>>>>>>>> refill_sheaf mm/slub.c:2816 [inline] >>>>>>>>>>>> __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 >>>>>>>>>>>> alloc_from_pcs mm/slub.c:4749 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4883 [inline] >>>>>>>>>>>> kmem_cache_alloc_node_noprof+0x441/0x690 mm/slub.c:4950 >>>>>>>>>>>> __alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702 >>>>>>>>>>>> netlink_sendmsg+0x5d4/0xb40 net/netlink/af_netlink.c:1869 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 >>>>>>>>>>>> ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 >>>>>>>>>>>> __sys_sendmsg net/socket.c:2784 [inline] >>>>>>>>>>>> __do_sys_sendmsg net/socket.c:2789 [inline] >>>>>>>>>>>> __se_sys_sendmsg net/socket.c:2787 [inline] >>>>>>>>>>>> __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> page last free pid 15 tgid 15 stack trace: >>>>>>>>>>>> reset_page_owner include/linux/page_owner.h:25 [inline] >>>>>>>>>>>> __free_pages_prepare mm/page_alloc.c:1402 [inline] >>>>>>>>>>>> __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 >>>>>>>>>>>> rcu_do_batch kernel/rcu/tree.c:2617 [inline] >>>>>>>>>>>> rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 >>>>>>>>>>>> handle_softirqs+0x22a/0x840 kernel/softirq.c:622 >>>>>>>>>>>> run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076 >>>>>>>>>>>> smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 >>>>>>>>>>>> kthread+0x389/0x470 kernel/kthread.c:436 >>>>>>>>>>>> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 >>>>>>>>>>>> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 >>>>>>>>>>>> >>>>>>>>>>>> Memory state around the buggy address: >>>>>>>>>>>> ffff888167305280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb f= c fc >>>>>>>>>>>> ffff888167305300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> >ffff888167305380: fa fb fb fb fb fb fb fb fb fb fb fb fb fb f= b fb >>>>>>>>>>>> ^ >>>>>>>>>>>> ffff888167305400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb f= c fc >>>>>>>>>>>> ffff888167305480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> *** >>>>>>>>>>>> >>>>>>>>>>>> KASAN: slab-use-after-free Write in sk_skb_reason_drop >>>>>>>>>>>> >>>>>>>>>>>> tree: net >>>>>>>>>>>> URL: https://kernel.googlesource.com/pub/scm/linux/kerne= l/git/netdev/net.git >>>>>>>>>>>> base: 18014147d3ee7831dce53fe65d7fc8d428b02552 >>>>>>>>>>>> arch: amd64 >>>>>>>>>>>> compiler: Debian clang version 21.1.8 (++20251221033036+2078d= a43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 >>>>>>>>>>>> config: https://ci.syzbot.org/builds/90c5185d-0dad-4c34-a56= 3-4253ebb12eb2/config >>>>>>>>>>>> syz repro: https://ci.syzbot.org/findings/c87569e1-d26e-4670-a= 17b-9f2f64a5af67/syz_repro >>>>>>>>>>>> >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in instrument_atomic_read_writ= e include/linux/instrumented.h:112 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in atomic_fetch_sub_release in= clude/linux/atomic/atomic-instrumented.h:400 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in __refcount_sub_and_test inc= lude/linux/refcount.h:389 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in __refcount_dec_and_test inc= lude/linux/refcount.h:432 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in refcount_dec_and_test inclu= de/linux/refcount.h:450 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in skb_unref include/linux/skb= uff.h:1292 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in __sk_skb_reason_drop net/co= re/skbuff.c:1212 [inline] >>>>>>>>>>>> BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x37/0x1= 10 net/core/skbuff.c:1240 >>>>>>>>>>>> Write of size 4 at addr ffff8881178efee4 by task syz.1.18/5873 >>>>>>>>>>>> >>>>>>>>>>>> CPU: 0 UID: 0 PID: 5873 Comm: syz.1.18 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 >>>>>>>>>>>> Call Trace: >>>>>>>>>>>> >>>>>>>>>>>> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 >>>>>>>>>>>> print_address_description+0x55/0x1e0 mm/kasan/report.c:378 >>>>>>>>>>>> print_report+0x58/0x70 mm/kasan/report.c:482 >>>>>>>>>>>> kasan_report+0x117/0x150 mm/kasan/report.c:595 >>>>>>>>>>>> check_region_inline mm/kasan/generic.c:-1 [inline] >>>>>>>>>>>> kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 >>>>>>>>>>>> instrument_atomic_read_write include/linux/instrumented.h:112= [inline] >>>>>>>>>>>> atomic_fetch_sub_release include/linux/atomic/atomic-instrume= nted.h:400 [inline] >>>>>>>>>>>> __refcount_sub_and_test include/linux/refcount.h:389 [inline] >>>>>>>>>>>> __refcount_dec_and_test include/linux/refcount.h:432 [inline] >>>>>>>>>>>> refcount_dec_and_test include/linux/refcount.h:450 [inline] >>>>>>>>>>>> skb_unref include/linux/skbuff.h:1292 [inline] >>>>>>>>>>>> __sk_skb_reason_drop net/core/skbuff.c:1212 [inline] >>>>>>>>>>>> sk_skb_reason_drop+0x37/0x110 net/core/skbuff.c:1240 >>>>>>>>>>>> kfree_skb_reason include/linux/skbuff.h:1322 [inline] >>>>>>>>>>>> kfree_skb include/linux/skbuff.h:1331 [inline] >>>>>>>>>>>> netlink_release+0x133a/0x1ad0 net/netlink/af_netlink.c:770 >>>>>>>>>>>> __sock_release net/socket.c:722 [inline] >>>>>>>>>>>> sock_close+0xc3/0x240 net/socket.c:1514 >>>>>>>>>>>> __fput+0x44f/0xa60 fs/file_table.c:510 >>>>>>>>>>>> task_work_run+0x1d9/0x270 kernel/task_work.c:233 >>>>>>>>>>>> resume_user_mode_work include/linux/resume_user_mode.h:50 [in= line] >>>>>>>>>>>> __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] >>>>>>>>>>>> exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 >>>>>>>>>>>> __exit_to_user_mode_prepare include/linux/irq-entry-common.h:= 207 [inline] >>>>>>>>>>>> syscall_exit_to_user_mode_prepare include/linux/irq-entry-com= mon.h:230 [inline] >>>>>>>>>>>> syscall_exit_to_user_mode include/linux/entry-common.h:318 [i= nline] >>>>>>>>>>>> do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> RIP: 0033:0x7fd4d139ce59 >>>>>>>>>>>> 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:00007fff722ecbf8 EFLAGS: 00000246 ORIG_RAX: 00000000= 000001b4 >>>>>>>>>>>> RAX: 0000000000000000 RBX: 00007fff722ecce0 RCX: 00007fd4d139c= e59 >>>>>>>>>>>> RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000= 003 >>>>>>>>>>>> RBP: 0000000000012825 R08: 0000000000000001 R09: 0000000000000= 000 >>>>>>>>>>>> R10: 0000001b32e20000 R11: 0000000000000246 R12: 00007fff722ec= d20 >>>>>>>>>>>> R13: 00007fd4d1615fac R14: 0000000000012859 R15: 00007fd4d1615= fa0 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Allocated by task 5874: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> unpoison_slab_object mm/kasan/common.c:340 [inline] >>>>>>>>>>>> __kasan_mempool_unpoison_object+0xa3/0x130 mm/kasan/common.c:= 564 >>>>>>>>>>>> kasan_mempool_unpoison_object include/linux/kasan.h:391 [inli= ne] >>>>>>>>>>>> napi_skb_cache_get+0x3c8/0x780 net/core/skbuff.c:306 >>>>>>>>>>>> __alloc_skb+0x19a/0x7d0 net/core/skbuff.c:696 >>>>>>>>>>>> netlink_sendmsg+0x5d4/0xb40 net/netlink/af_netlink.c:1869 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> __sys_sendto+0x672/0x710 net/socket.c:2265 >>>>>>>>>>>> __do_sys_sendto net/socket.c:2272 [inline] >>>>>>>>>>>> __se_sys_sendto net/socket.c:2268 [inline] >>>>>>>>>>>> __x64_sys_sendto+0xde/0x100 net/socket.c:2268 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> Freed by task 5874: >>>>>>>>>>>> kasan_save_stack mm/kasan/common.c:57 [inline] >>>>>>>>>>>> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 >>>>>>>>>>>> kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 >>>>>>>>>>>> poison_slab_object mm/kasan/common.c:253 [inline] >>>>>>>>>>>> __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 >>>>>>>>>>>> kasan_slab_free include/linux/kasan.h:235 [inline] >>>>>>>>>>>> slab_free_hook mm/slub.c:2689 [inline] >>>>>>>>>>>> slab_free mm/slub.c:6250 [inline] >>>>>>>>>>>> kmem_cache_free+0x182/0x650 mm/slub.c:6377 >>>>>>>>>>>> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] >>>>>>>>>>>> netlink_unicast+0x764/0x8e0 net/netlink/af_netlink.c:1344 >>>>>>>>>>>> netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> __sys_sendto+0x672/0x710 net/socket.c:2265 >>>>>>>>>>>> __do_sys_sendto net/socket.c:2272 [inline] >>>>>>>>>>>> __se_sys_sendto net/socket.c:2268 [inline] >>>>>>>>>>>> __x64_sys_sendto+0xde/0x100 net/socket.c:2268 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the object at ffff8881178efe00 >>>>>>>>>>>> which belongs to the cache skbuff_head_cache of size 240 >>>>>>>>>>>> The buggy address is located 228 bytes inside of >>>>>>>>>>>> freed 240-byte region [ffff8881178efe00, ffff8881178efef0) >>>>>>>>>>>> >>>>>>>>>>>> The buggy address belongs to the physical page: >>>>>>>>>>>> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0= pfn:0x1178ee >>>>>>>>>>>> head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 p= incount:0 >>>>>>>>>>>> flags: 0x17ff00000000040(head|node=3D0|zone=3D2|lastcpupid=3D0= x7ff) >>>>>>>>>>>> page_type: f5(slab) >>>>>>>>>>>> raw: 017ff00000000040 ffff888160416c80 dead000000000122 000000= 0000000000 >>>>>>>>>>>> raw: 0000000000000000 0000000800150015 00000000f5000000 000000= 0000000000 >>>>>>>>>>>> head: 017ff00000000040 ffff888160416c80 dead000000000122 00000= 00000000000 >>>>>>>>>>>> head: 0000000000000000 0000000800150015 00000000f5000000 00000= 00000000000 >>>>>>>>>>>> head: 017ff00000000001 ffffffffffffff81 00000000ffffffff 00000= 000ffffffff >>>>>>>>>>>> head: ffffffffffffffff 0000000000000000 00000000ffffffff 00000= 00000000002 >>>>>>>>>>>> page dumped because: kasan: bad access detected >>>>>>>>>>>> page_owner tracks the page as allocated >>>>>>>>>>>> page last allocated via order 1, migratetype Unmovable, gfp_ma= sk 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NO= MEMALLOC), pid 5050, tgid 5050 (klogd), ts 75887265953, free_ts 75876344896 >>>>>>>>>>>> set_page_owner include/linux/page_owner.h:32 [inline] >>>>>>>>>>>> post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858 >>>>>>>>>>>> prep_new_page mm/page_alloc.c:1866 [inline] >>>>>>>>>>>> get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 >>>>>>>>>>>> __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 >>>>>>>>>>>> alloc_slab_page mm/slub.c:3278 [inline] >>>>>>>>>>>> allocate_slab+0x77/0x660 mm/slub.c:3467 >>>>>>>>>>>> new_slab mm/slub.c:3525 [inline] >>>>>>>>>>>> refill_objects+0x339/0x3d0 mm/slub.c:7271 >>>>>>>>>>>> refill_sheaf mm/slub.c:2816 [inline] >>>>>>>>>>>> __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 >>>>>>>>>>>> alloc_from_pcs mm/slub.c:4749 [inline] >>>>>>>>>>>> slab_alloc_node mm/slub.c:4883 [inline] >>>>>>>>>>>> kmem_cache_alloc_node_noprof+0x441/0x690 mm/slub.c:4950 >>>>>>>>>>>> __alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702 >>>>>>>>>>>> alloc_skb include/linux/skbuff.h:1383 [inline] >>>>>>>>>>>> alloc_skb_with_frags+0xc8/0x760 net/core/skbuff.c:6743 >>>>>>>>>>>> sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:2998 >>>>>>>>>>>> unix_dgram_sendmsg+0x460/0x18d0 net/unix/af_unix.c:2141 >>>>>>>>>>>> sock_sendmsg_nosec net/socket.c:787 [inline] >>>>>>>>>>>> __sock_sendmsg net/socket.c:802 [inline] >>>>>>>>>>>> __sys_sendto+0x672/0x710 net/socket.c:2265 >>>>>>>>>>>> __do_sys_sendto net/socket.c:2272 [inline] >>>>>>>>>>>> __se_sys_sendto net/socket.c:2268 [inline] >>>>>>>>>>>> __x64_sys_sendto+0xde/0x100 net/socket.c:2268 >>>>>>>>>>>> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>>>>>>>>>>> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 >>>>>>>>>>>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>>>>>>>>>>> page last free pid 0 tgid 0 stack trace: >>>>>>>>>>>> reset_page_owner include/linux/page_owner.h:25 [inline] >>>>>>>>>>>> __free_pages_prepare mm/page_alloc.c:1402 [inline] >>>>>>>>>>>> __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 >>>>>>>>>>>> rcu_do_batch kernel/rcu/tree.c:2617 [inline] >>>>>>>>>>>> rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 >>>>>>>>>>>> handle_softirqs+0x22a/0x840 kernel/softirq.c:622 >>>>>>>>>>>> __do_softirq kernel/softirq.c:656 [inline] >>>>>>>>>>>> invoke_softirq kernel/softirq.c:496 [inline] >>>>>>>>>>>> __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 >>>>>>>>>>>> irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 >>>>>>>>>>>> instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c= :1061 [inline] >>>>>>>>>>>> sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/ap= ic.c:1061 >>>>>>>>>>>> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/as= m/idtentry.h:697 >>>>>>>>>>>> >>>>>>>>>>>> Memory state around the buggy address: >>>>>>>>>>>> ffff8881178efd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> ffff8881178efe00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb f= b fb >>>>>>>>>>>> >ffff8881178efe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb f= c fc >>>>>>>>>>>> ^ >>>>>>>>>>>> ffff8881178eff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> ffff8881178eff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc f= c fc >>>>>>>>>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> *** >>>>>>>>>>>> >>>>>>>>>>>> If these findings have caused you to resend the series or subm= it a >>>>>>>>>>>> separate fix, please add the following tag to your commit mess= age: >>>>>>>>>>>> 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.c= om. >>>>>>>>>>>> >>>>>>>>>>>> To test a patch for this bug, please reply with `#syz test` >>>>>>>>>>>> (should be on a separate line). >>>>>>>>>>>> >>>>>>>>>>>> The patch should be attached to the email. >>>>>>>>>>>> Note: arguments like custom git repos and branches are not sup= ported. >>>>>>>>>>>> >>>>>>>>>>>> The email will later be sent to: >>>>>>>>>>>> [davem@davemloft.net edumazet@google.com horms@kernel.org kees= @kernel.org kuba@kernel.org kuniyu@google.com linux-kernel@vger.kernel.org = netdev@vger.kernel.org pabeni@redhat.com stable@vger.kernel.org vulab@iscas= .ac.cn yangfeng@kylinos.cn] >>>>>>>>>>>> >>>>>>>>>>>> If the report looks fine to you, reply with: >>>>>>>>>>>> #syz upstream >>>>>>>>>>>> >>>>>>>>>>>> If the report is a false positive, reply with >>>>>>>>>>>> #syz invalid >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>>> You received this message because you are subscribed to the Go= ogle Groups "syzkaller-upstream-moderation" group. >>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from = it, send an email to syzkaller-upstream-moderation+unsubscribe@googlegroups= .com. >>>>>>>>>>>> To view this discussion visit https://groups.google.com/d/msgi= d/syzkaller-upstream-moderation/6a185386.99a1ea37.128423.0001.GAE%40google.= com. >>>>>>>>>> >>>>>>>>>> --=20 >>>>>>>>>> You received this message because you are subscribed to the Goog= le Groups "syzkaller-upstream-moderation" group. >>>>>>>>>> To unsubscribe from this group and stop receiving emails from it= , send an email to syzkaller-upstream-moderation+unsubscribe@googlegroups.c= om. >>>>>>>>>> To view this discussion visit https://groups.google.com/d/msgid/= syzkaller-upstream-moderation/6a18555e.e783d627.6395.0001.GAE%40google.com. >>>>>>>>> >>>>>>>>> I see the command but can't find the corresponding bug. >>>>>>>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com addre= ss >>>>>>>>> but the HASH does not correspond to any known bug. >>>>>>>>> Please double check the address. >>>>>>>>> >>>>>>>> >>>>>>>> I see the command but can't find the corresponding bug. >>>>>>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com addres= s >>>>>>>> but the HASH does not correspond to any known bug. >>>>>>>> Please double check the address. >>>>>>>> >>>>>>> >>>>>>> I see the command but can't find the corresponding bug. >>>>>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >>>>>>> but the HASH does not correspond to any known bug. >>>>>>> Please double check the address. >>>>>>> >>>>>> >>>>>> I see the command but can't find the corresponding bug. >>>>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >>>>>> but the HASH does not correspond to any known bug. >>>>>> Please double check the address. >>>>>> >>>>>> --=20 >>>>>> You received this message because you are subscribed to the Google G= roups "syzkaller-upstream-moderation" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, se= nd an email to syzkaller-upstream-moderation+unsubscribe@googlegroups.com. >>>>>> To view this discussion visit https://groups.google.com/d/msgid/syzk= aller-upstream-moderation/6a185562.9efe2910.1869e6.0003.GAE%40google.com. >>>>> >>>>> I see the command but can't find the corresponding bug. >>>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >>>>> but the HASH does not correspond to any known bug. >>>>> Please double check the address. >>>>> >>>> >>>> I see the command but can't find the corresponding bug. >>>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >>>> but the HASH does not correspond to any known bug. >>>> Please double check the address. >>>> >>>> --=20 >>>> You received this message because you are subscribed to the Google Gro= ups "syzkaller-upstream-moderation" group. >>>> To unsubscribe from this group and stop receiving emails from it, send= an email to syzkaller-upstream-moderation+unsubscribe@googlegroups.com. >>>> To view this discussion visit https://groups.google.com/d/msgid/syzkal= ler-upstream-moderation/6a185566.b6d9d2ce.2aaec5.0007.GAE%40google.com. >>> >>> I see the command but can't find the corresponding bug. >>> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >>> but the HASH does not correspond to any known bug. >>> Please double check the address. >>> >> >> I see the command but can't find the corresponding bug. >> The email is sent to syzbot+HASH@syzkaller.appspotmail.com address >> but the HASH does not correspond to any known bug. >> Please double check the address. >> > > I see the command but can't find the corresponding bug. > The email is sent to syzbot+HASH@syzkaller.appspotmail.com address > but the HASH does not correspond to any known bug. > Please double check the address. > I see the command but can't find the corresponding bug. The email is sent to syzbot+HASH@syzkaller.appspotmail.com address but the HASH does not correspond to any known bug. Please double check the address.