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Message-ID: <68fb53c2.a70a0220.3bf6c6.0192.GAE@google.com> Date: Fri, 24 Oct 2025 03:24:02 -0700 From: syzbot <syzbot+c16daba279a1161acfb0@...kaller.appspotmail.com> To: dmantipov@...dex.ru, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_commit_truncate Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: UBSAN: signed-integer-overflow in ip_idents_reserve ================================================================================ UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11 -498696627 + -2117033276 cannot be represented in type 'int' CPU: 1 PID: 33 Comm: kworker/u4:2 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker Call Trace: <IRQ> dump_stack+0xfd/0x16e lib/dump_stack.c:118 ubsan_epilogue+0xa/0x30 lib/ubsan.c:148 handle_overflow+0x192/0x1b0 lib/ubsan.c:180 arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] atomic_add_return include/asm-generic/atomic-instrumented.h:73 [inline] ip_idents_reserve+0x14a/0x170 net/ipv4/route.c:521 __ip_select_ident+0xe4/0x1c0 net/ipv4/route.c:538 ip_select_ident_segs include/net/ip.h:525 [inline] ip_select_ident include/net/ip.h:532 [inline] __ip_make_skb+0xf78/0x19b0 net/ipv4/ip_output.c:1551 ip_finish_skb include/net/ip.h:244 [inline] ip_push_pending_frames+0x2c/0x150 net/ipv4/ip_output.c:1606 __icmp_send+0xc22/0xf70 net/ipv4/icmp.c:776 icmp_send include/net/icmp.h:43 [inline] __udp4_lib_rcv+0x14e9/0x2070 net/ipv4/udp.c:2438 ip_protocol_deliver_rcu+0x405/0x7e0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1d5/0x330 net/ipv4/ip_input.c:231 NF_HOOK+0x25a/0x2c0 include/linux/netfilter.h:296 NF_HOOK+0x25a/0x2c0 include/linux/netfilter.h:296 __netif_receive_skb_one_core net/core/dev.c:5395 [inline] __netif_receive_skb+0x144/0x380 net/core/dev.c:5509 process_backlog+0x4ef/0x6e0 net/core/dev.c:6416 napi_poll net/core/dev.c:6867 [inline] net_rx_action+0x4b1/0xc30 net/core/dev.c:6937 __do_softirq+0x267/0x92e kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9b/0xe0 arch/x86/kernel/irq_64.c:77 do_softirq+0xc4/0x100 kernel/softirq.c:343 __local_bh_enable_ip+0x121/0x160 kernel/softirq.c:195 wg_socket_send_skb_to_peer+0x167/0x1c0 drivers/net/wireguard/socket.c:184 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x16b/0x280 drivers/net/wireguard/send.c:51 process_one_work+0x85b/0xfe0 kernel/workqueue.c:2282 worker_thread+0xa9b/0x1430 kernel/workqueue.c:2428 kthread+0x384/0x410 kernel/kthread.c:328 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ================================================================================ Tested on: commit: d3d0b4e2 Linux 5.10.245 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y console output: https://syzkaller.appspot.com/x/log.txt?x=10f19be2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e1734393bfd41d2b dashboard link: https://syzkaller.appspot.com/bug?extid=c16daba279a1161acfb0 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=151d0be2580000
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