From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAA14BA4B; Mon, 9 Sep 2024 15:31:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725895886; cv=none; b=TZt/xWgvYzYOJa586qozAE3nkpQSz0jkd1BjEJqzEL9t9LitJT/DAP67nidZotnhGeBkMOVorhQO5mKCtPKquMH0odP6oIsEydHLgM5KL0O1fphlq9RX5PNu19gGeBhZimcH0vnqRHq2e7IqWRTqv7t929lBSs0Z4X/mY40+mm0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725895886; c=relaxed/simple; bh=9L1GOsdi5+JtiSlb8g2uP4CmHMh+VmQwyyhPfzRZPRk=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=aFC6qJnEqMRGspe+j/IhL/4eqZ07I/6Vlf5cWh5l84CB/ZHZ8OTObGa5Z6heUavaaeW3DLrFUfLfSvclDR31Md0zFO5qkSRhLKKwYox84W4pO5ysqjao1+BzQ8jyWbsO9zNimMbtseYjb58FUFZoJNugzEni92cnyTqDQi1NsLs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=thrQ/6E+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="thrQ/6E+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A84EEC4CEC5; Mon, 9 Sep 2024 15:31:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725895886; bh=9L1GOsdi5+JtiSlb8g2uP4CmHMh+VmQwyyhPfzRZPRk=; h=Date:Subject:To:References:From:In-Reply-To:From; b=thrQ/6E+SXwqDqecO3m2CBbJVCoITIsV2oExtqVtidmPXFK9U0s89uP2M1VUDsRYg EaOAsMMiN6/RW+6vrFfhiUKGtWbPxvqvNlBeE+N26Re4Xue29pOYQoUFnxoqjkEjUO 1AZETvDcux9EaTS943DSLb/TjZRoGJ/rGJER/ErdSfhrZGqPXXxA8RmDqCX7ttQRnv rd3dOf5KrGOnXwZpfeVA0NaxvCw0GATDY0rYeTXUsL+T5hJXXF5FVF9E7yr+/uQmLN KRBnvCsrfX52RzCT98qVgOvgwiLzvdaOYkkzQ0ZEH6ciz9rUbozs69dcr39jaWEe9E bEweTU/TJMhCA== Message-ID: Date: Mon, 9 Sep 2024 17:31:12 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [syzbot] [mptcp?] KASAN: slab-use-after-free Read in lock_timer_base Content-Language: en-GB To: syzbot , davem@davemloft.net, edumazet@google.com, geliang@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, martineau@kernel.org, mptcp@lists.linux.dev, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com References: <000000000000b1b939062137e978@google.com> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; keydata= xsFNBFXj+ekBEADxVr99p2guPcqHFeI/JcFxls6KibzyZD5TQTyfuYlzEp7C7A9swoK5iCvf YBNdx5Xl74NLSgx6y/1NiMQGuKeu+2BmtnkiGxBNanfXcnl4L4Lzz+iXBvvbtCbynnnqDDqU c7SPFMpMesgpcu1xFt0F6bcxE+0ojRtSCZ5HDElKlHJNYtD1uwY4UYVGWUGCF/+cY1YLmtfb WdNb/SFo+Mp0HItfBC12qtDIXYvbfNUGVnA5jXeWMEyYhSNktLnpDL2gBUCsdbkov5VjiOX7 CRTkX0UgNWRjyFZwThaZADEvAOo12M5uSBk7h07yJ97gqvBtcx45IsJwfUJE4hy8qZqsA62A nTRflBvp647IXAiCcwWsEgE5AXKwA3aL6dcpVR17JXJ6nwHHnslVi8WesiqzUI9sbO/hXeXw TDSB+YhErbNOxvHqCzZEnGAAFf6ges26fRVyuU119AzO40sjdLV0l6LE7GshddyazWZf0iac nEhX9NKxGnuhMu5SXmo2poIQttJuYAvTVUNwQVEx/0yY5xmiuyqvXa+XT7NKJkOZSiAPlNt6 VffjgOP62S7M9wDShUghN3F7CPOrrRsOHWO/l6I/qJdUMW+MHSFYPfYiFXoLUZyPvNVCYSgs 3oQaFhHapq1f345XBtfG3fOYp1K2wTXd4ThFraTLl8PHxCn4ywARAQABzSRNYXR0aGlldSBC YWVydHMgPG1hdHR0YmVAa2VybmVsLm9yZz7CwZEEEwEIADsCGwMFCwkIBwIGFQoJCAsCBBYC AwECHgECF4AWIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZUDpDAIZAQAKCRD2t4JPQmmgcz33 EACjROM3nj9FGclR5AlyPUbAq/txEX7E0EFQCDtdLPrjBcLAoaYJIQUV8IDCcPjZMJy2ADp7 /zSwYba2rE2C9vRgjXZJNt21mySvKnnkPbNQGkNRl3TZAinO1Ddq3fp2c/GmYaW1NWFSfOmw MvB5CJaN0UK5l0/drnaA6Hxsu62V5UnpvxWgexqDuo0wfpEeP1PEqMNzyiVPvJ8bJxgM8qoC cpXLp1Rq/jq7pbUycY8GeYw2j+FVZJHlhL0w0Zm9CFHThHxRAm1tsIPc+oTorx7haXP+nN0J iqBXVAxLK2KxrHtMygim50xk2QpUotWYfZpRRv8dMygEPIB3f1Vi5JMwP4M47NZNdpqVkHrm jvcNuLfDgf/vqUvuXs2eA2/BkIHcOuAAbsvreX1WX1rTHmx5ud3OhsWQQRVL2rt+0p1DpROI 3Ob8F78W5rKr4HYvjX2Inpy3WahAm7FzUY184OyfPO/2zadKCqg8n01mWA9PXxs84bFEV2mP VzC5j6K8U3RNA6cb9bpE5bzXut6T2gxj6j+7TsgMQFhbyH/tZgpDjWvAiPZHb3sV29t8XaOF BwzqiI2AEkiWMySiHwCCMsIH9WUH7r7vpwROko89Tk+InpEbiphPjd7qAkyJ+tNIEWd1+MlX ZPtOaFLVHhLQ3PLFLkrU3+Yi3tXqpvLE3gO3LM7BTQRV4/npARAA5+u/Sx1n9anIqcgHpA7l 5SUCP1e/qF7n5DK8LiM10gYglgY0XHOBi0S7vHppH8hrtpizx+7t5DBdPJgVtR6SilyK0/mp 9nWHDhc9rwU3KmHYgFFsnX58eEmZxz2qsIY8juFor5r7kpcM5dRR9aB+HjlOOJJgyDxcJTwM 1ey4L/79P72wuXRhMibN14SX6TZzf+/XIOrM6TsULVJEIv1+NdczQbs6pBTpEK/G2apME7vf mjTsZU26Ezn+LDMX16lHTmIJi7Hlh7eifCGGM+g/AlDV6aWKFS+sBbwy+YoS0Zc3Yz8zrdbi Kzn3kbKd+99//mysSVsHaekQYyVvO0KD2KPKBs1S/ImrBb6XecqxGy/y/3HWHdngGEY2v2IP Qox7mAPznyKyXEfG+0rrVseZSEssKmY01IsgwwbmN9ZcqUKYNhjv67WMX7tNwiVbSrGLZoqf Xlgw4aAdnIMQyTW8nE6hH/Iwqay4S2str4HZtWwyWLitk7N+e+vxuK5qto4AxtB7VdimvKUs x6kQO5F3YWcC3vCXCgPwyV8133+fIR2L81R1L1q3swaEuh95vWj6iskxeNWSTyFAVKYYVskG V+OTtB71P1XCnb6AJCW9cKpC25+zxQqD2Zy0dK3u2RuKErajKBa/YWzuSaKAOkneFxG3LJIv Hl7iqPF+JDCjB5sAEQEAAcLBXwQYAQIACQUCVeP56QIbDAAKCRD2t4JPQmmgc5VnD/9YgbCr HR1FbMbm7td54UrYvZV/i7m3dIQNXK2e+Cbv5PXf19ce3XluaE+wA8D+vnIW5mbAAiojt3Mb 6p0WJS3QzbObzHNgAp3zy/L4lXwc6WW5vnpWAzqXFHP8D9PTpqvBALbXqL06smP47JqbyQxj Xf7D2rrPeIqbYmVY9da1KzMOVf3gReazYa89zZSdVkMojfWsbq05zwYU+SCWS3NiyF6QghbW voxbFwX1i/0xRwJiX9NNbRj1huVKQuS4W7rbWA87TrVQPXUAdkyd7FRYICNW+0gddysIwPoa KrLfx3Ba6Rpx0JznbrVOtXlihjl4KV8mtOPjYDY9u+8x412xXnlGl6AC4HLu2F3ECkamY4G6 UxejX+E6vW6Xe4n7H+rEX5UFgPRdYkS1TA/X3nMen9bouxNsvIJv7C6adZmMHqu/2azX7S7I vrxxySzOw9GxjoVTuzWMKWpDGP8n71IFeOot8JuPZtJ8omz+DZel+WCNZMVdVNLPOd5frqOv mpz0VhFAlNTjU1Vy0CnuxX3AM51J8dpdNyG0S8rADh6C8AKCDOfUstpq28/6oTaQv7QZdge0 JY6dglzGKnCi/zsmp2+1w559frz4+IC7j/igvJGX4KDDKUs0mlld8J2u2sBXv7CGxdzQoHaz lzVbFe7fduHbABmYz9cefQpO7wDE/Q== Organization: NGI0 Core In-Reply-To: <000000000000b1b939062137e978@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hello, Thank you for the report. On 03/09/2024 16:31, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1934261d8974 Merge tag 'input-for-v6.11-rc5' of git://git... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10bf9943980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=996585887acdadb3 > dashboard link: https://syzkaller.appspot.com/bug?extid=3a98aec25a4ab6a4d963 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/d02c28e8dbf3/disk-1934261d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/464d0e233034/vmlinux-1934261d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/8735d78fb16a/bzImage-1934261d.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3a98aec25a4ab6a4d963@syzkaller.appspotmail.com > > TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies. > ================================================================== > BUG: KASAN: slab-use-after-free in lock_timer_base+0x1a7/0x240 kernel/time/timer.c:1052 > Read of size 4 at addr ffff888029b38e50 by task kworker/0:2/940 > > CPU: 0 UID: 0 PID: 940 Comm: kworker/0:2 Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 > Workqueue: events mptcp_worker > Call Trace: > > __dump_stack lib/dump_stack.c:93 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 > print_address_description mm/kasan/report.c:377 [inline] > print_report+0x169/0x550 mm/kasan/report.c:488 > kasan_report+0x143/0x180 mm/kasan/report.c:601 > lock_timer_base+0x1a7/0x240 kernel/time/timer.c:1052 > __try_to_del_timer_sync+0xb5/0x340 kernel/time/timer.c:1506 > __timer_delete_sync+0x245/0x310 kernel/time/timer.c:1665 > del_timer_sync include/linux/timer.h:185 [inline] > sk_stop_timer_sync+0x1c/0x90 net/core/sock.c:3454 > mptcp_pm_del_add_timer+0x18d/0x250 net/mptcp/pm_netlink.c:345 > mptcp_incoming_options+0x158d/0x2570 net/mptcp/options.c:1166 > tcp_data_queue+0xf5/0x76c0 net/ipv4/tcp_input.c:5206 > tcp_rcv_established+0xfba/0x2020 net/ipv4/tcp_input.c:6230 > tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1911 > tcp_v4_rcv+0x2dc0/0x37f0 net/ipv4/tcp_ipv4.c:2346 > ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205 > ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233 > NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 > NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 > __netif_receive_skb_one_core net/core/dev.c:5661 [inline] > __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5775 > process_backlog+0x662/0x15b0 net/core/dev.c:6108 > __napi_poll+0xcb/0x490 net/core/dev.c:6772 > napi_poll net/core/dev.c:6841 [inline] > net_rx_action+0x89b/0x1240 net/core/dev.c:6963 > handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 > do_softirq+0x11b/0x1e0 kernel/softirq.c:455 > > > __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 > mptcp_pm_send_ack net/mptcp/pm_netlink.c:496 [inline] > mptcp_pm_nl_addr_send_ack+0x3ec/0x4e0 net/mptcp/pm_netlink.c:785 > mptcp_pm_nl_work+0x18e8/0x1fc0 net/mptcp/pm_netlink.c:924 > mptcp_worker+0x12f/0x1440 net/mptcp/protocol.c:2759 > process_one_work kernel/workqueue.c:3231 [inline] > process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 > worker_thread+0x86d/0xd10 kernel/workqueue.c:3389 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > > Allocated by task 940: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:370 [inline] > __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 > kasan_kmalloc include/linux/kasan.h:211 [inline] > __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4189 > kmalloc_noprof include/linux/slab.h:681 [inline] > mptcp_pm_alloc_anno_list+0x14e/0x390 net/mptcp/pm_netlink.c:370 > mptcp_pm_create_subflow_or_signal_addr+0x1920/0x22c0 net/mptcp/pm_netlink.c:586 > mptcp_pm_nl_fully_established net/mptcp/pm_netlink.c:640 [inline] > mptcp_pm_nl_work+0x19ae/0x1fc0 net/mptcp/pm_netlink.c:932 > mptcp_worker+0x12f/0x1440 net/mptcp/protocol.c:2759 > process_one_work kernel/workqueue.c:3231 [inline] > process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 > worker_thread+0x86d/0xd10 kernel/workqueue.c:3389 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > Freed by task 12966: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 > poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 > __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 > kasan_slab_free include/linux/kasan.h:184 [inline] > slab_free_hook mm/slub.c:2252 [inline] > slab_free mm/slub.c:4473 [inline] > kfree+0x149/0x360 mm/slub.c:4594 > remove_anno_list_by_saddr+0x156/0x190 net/mptcp/pm_netlink.c:1466 > mptcp_pm_remove_addrs_and_subflows net/mptcp/pm_netlink.c:1687 [inline] > mptcp_nl_remove_addrs_list net/mptcp/pm_netlink.c:1718 [inline] > mptcp_pm_nl_flush_addrs_doit+0x664/0xd60 net/mptcp/pm_netlink.c:1759 > genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] > genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] > genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210 > netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 > genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 > netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] > netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 > netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 > sock_sendmsg_nosec net/socket.c:730 [inline] > __sock_sendmsg+0x221/0x270 net/socket.c:745 > ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 > ___sys_sendmsg net/socket.c:2651 [inline] > __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > The buggy address belongs to the object at ffff888029b38e00 > which belongs to the cache kmalloc-192 of size 192 > The buggy address is located 80 bytes inside of > freed 192-byte region [ffff888029b38e00, ffff888029b38ec0) > > The buggy address belongs to the physical page: > page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29b38 > ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) > page_type: 0xfdffffff(slab) > raw: 00fff00000000000 ffff88801ac413c0 ffffea0000bd3380 dead000000000003 > raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x352800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 5573, tgid 5573 (cmp), ts 78576722831, free_ts 78537901249 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 > prep_new_page mm/page_alloc.c:1501 [inline] > get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 > __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 > __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] > alloc_pages_node_noprof include/linux/gfp.h:296 [inline] > alloc_slab_page+0x5f/0x120 mm/slub.c:2321 > allocate_slab+0x5a/0x2f0 mm/slub.c:2484 > new_slab mm/slub.c:2537 [inline] > ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 > __slab_alloc+0x58/0xa0 mm/slub.c:3813 > __slab_alloc_node mm/slub.c:3866 [inline] > slab_alloc_node mm/slub.c:4025 [inline] > __do_kmalloc_node mm/slub.c:4157 [inline] > __kmalloc_node_noprof+0x286/0x440 mm/slub.c:4164 > kmalloc_array_node_noprof include/linux/slab.h:788 [inline] > alloc_slab_obj_exts mm/slub.c:1976 [inline] > account_slab mm/slub.c:2447 [inline] > allocate_slab+0xb6/0x2f0 mm/slub.c:2502 > new_slab mm/slub.c:2537 [inline] > ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 > __slab_alloc+0x58/0xa0 mm/slub.c:3813 > __slab_alloc_node mm/slub.c:3866 [inline] > slab_alloc_node mm/slub.c:4025 [inline] > kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4044 > vma_lock_alloc kernel/fork.c:445 [inline] > vm_area_dup+0x61/0x290 kernel/fork.c:498 > __split_vma+0x1a9/0xc30 mm/mmap.c:2465 > do_vmi_align_munmap+0x433/0x18c0 mm/mmap.c:2676 > do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830 > page last free pid 5572 tgid 5572 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1094 [inline] > free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2660 > folios_put_refs+0x76e/0x860 mm/swap.c:1039 > free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 > __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] > tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] > tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] > tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 > tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 > exit_mmap+0x44f/0xc80 mm/mmap.c:3425 > __mmput+0x115/0x390 kernel/fork.c:1345 > exit_mm+0x220/0x310 kernel/exit.c:571 > do_exit+0x9b2/0x27f0 kernel/exit.c:869 > do_group_exit+0x207/0x2c0 kernel/exit.c:1031 > __do_sys_exit_group kernel/exit.c:1042 [inline] > __se_sys_exit_group kernel/exit.c:1040 [inline] > __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 > x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Memory state around the buggy address: > ffff888029b38d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888029b38d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >> ffff888029b38e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff888029b38e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff888029b38f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== I think this report is a duplicate of the following one: https://syzkaller.appspot.com/bug?extid=3a98aec25a4ab6a4d963 Even if there is no reproducer, the call traces are very similar. I guess it is then fine to mark them as duplicated. #syz dup KASAN: slab-use-after-free Read in __timer_delete_sync https://lore.kernel.org/000000000000b1b939062137e978@google.com Cheers, Matt -- Sponsored by the NGI0 Core fund.