From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 7D63F61FCE for ; Sat, 27 Jun 2026 15:31:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782574298; cv=none; b=BOZvRMTeSBar0yq+1/RFQAPEMSrv3jkZ8zjGVXCDt6XLKlerk5QtVC23VLdopEbEo8t787DpYT1DbGJn0w28Rf5O6vnOqcc8OVD1UISnTXJxeFgVG6Zugt74m4Ms60DVO4GxdwfGvpCLIUJfPSfxnT1xOyKBuOydoSm6mQjxuas= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782574298; c=relaxed/simple; bh=8e7q4e/NtNUWIXpOPl6dhkCLcIQEwXlfYcmPRhfxEI4=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=I2Z9jxuGJvb2fcfBGMpM1zim0sp6kEnKmsXVnd9//BPyn3taS5lFT5pfQcPqq8baSpSV6IzDmktXIdzsA0eA76bxE0rsIBEYqin2MzSN4apOKqyA6tqLDAACZFFkZdPC6LLcPjVG4TlfwRZNWQuepnAIQI+PcI7aGFGimXr1qQ4= 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=209.85.167.205 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-oi1-f205.google.com with SMTP id 5614622812f47-485ebc5706cso5086326b6e.0 for ; Sat, 27 Jun 2026 08:31:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782574295; x=1783179095; h=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=JMtDhxQqmrwXBAgJrz9o5CQ4Umwh4FbcStTxUSyG5fs=; b=VLT9JBAIswFOQkHB/rg6nzA7Msn71y9e6GcjBQ+a/Ffg8tQb/AOA0OiwHYhEsKGGdi F0cQGEgKmDt0R5iFQKSFxgIj6F5uIzpTnr08LvJ+9VtMabh4+ytb5kIH7w5j+5eAKijt 3iSDwVMJE7EZPKdf0/NJmCd/lXdD2QOO6cdgVx904WQAdRt5ZvcVW1YAql9Ck+7FCfOy uULr7PvgVE5MM2HNu0osn/2k4k9iZwkQIBkeqy0HB3PvkfJ3oN5dfxPWBuJbyFYMYhVZ pyhHg4zcIP5xEBCzjHxCm1UMyCXKUcrbrAL97TJf04bLHUBbofjgIqtdWKLBi82qbWiV 8Erg== X-Forwarded-Encrypted: i=1; AFNElJ+TKJMm2j9MVwzA6v3N574d2pWRJOctSEXYCc0bjsouJoPb0oe6cho3/UXgZ5Usof80s9w=@vger.kernel.org X-Gm-Message-State: AOJu0Yxsj1L1EGs4XrRql9c+5lELGJD/lVAqUF2dCxEXiv8DMxTnyRmN 5MZP7viocNyqS1vjCefK2cS2ZTpUJJTf6ksOIi/B3daEz/Ie7J7MwHizsmI7PhjQ1hbSAWNlsEA /I7RrjG/F7bL7bCwlvQBnVC5q8KG35bJwsNpWil+PKaqp0NB3aathWrTmH9g= Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:c170:b0:491:3c9a:c486 with SMTP id 5614622812f47-4913c9adc98mr9591183b6e.27.1782574295639; Sat, 27 Jun 2026 08:31:35 -0700 (PDT) Date: Sat, 27 Jun 2026 08:31:35 -0700 In-Reply-To: <68089c01.050a0220.36a438.0010.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a3fecd7.ac7367b4.6675.000b.GAE@google.com> Subject: Re: [syzbot] [net?] BUG: soft lockup in hsr_announce (3) From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, eddyz87@gmail.com, edumazet@google.com, haoluo@google.com, horms@kernel.org, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, netdev@vger.kernel.org, pabeni@redhat.com, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 5a66900afbd6 Merge tag 'drm-fixes-2026-06-27' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10d729fe580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c3d59be33cf7e9a dashboard link: https://syzkaller.appspot.com/bug?extid=6c68a0400c33951a023c compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176df861580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-5a66900a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/73461c39cbcb/vmlinux-5a66900a.xz kernel image: https://storage.googleapis.com/syzbot-assets/b8ca145674f8/bzImage-5a66900a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6c68a0400c33951a023c@syzkaller.appspotmail.com watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.18:5749] Modules linked in: irq event stamp: 5276037 hardirqs last enabled at (5276036): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (5276036): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (5276036): [] irqentry_exit+0x218/0x8f0 kernel/entry/common.c:167 hardirqs last disabled at (5276037): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (7948): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (7948): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (7948): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 softirqs last disabled at (7951): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (7951): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (7951): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 CPU: 0 UID: 0 PID: 5749 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:unwind_next_frame+0x48e/0x2550 arch/x86/kernel/unwind_orc.c:520 Code: d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 bf 19 00 00 0f b6 43 01 <83> e0 07 0f 84 7c 16 00 00 83 f8 01 4c 8b 6c 24 50 49 bc 00 00 00 RSP: 0018:ffffc90000007480 EFLAGS: 00000246 RAX: 000000000000000b RBX: ffffffff90bf84c6 RCX: ffffffff90462a44 RDX: ffffffff90bf84c2 RSI: ffffffff90bf84c2 RDI: ffffffff8c2ac720 RBP: ffffffff8100012f R08: 0000000000000022 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e959c20 R12: dffffc0000000000 R13: ffffffff90bf84c7 R14: ffffc90000007528 R15: ffffffff90462a44 FS: 00007f111b0f96c0(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f111a1ea540 CR3: 000000003fc5d000 CR4: 0000000000352ef0 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 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:4612 [inline] slab_alloc_node mm/slub.c:4945 [inline] kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4959 skb_clone+0x212/0x3a0 net/core/skbuff.c:2110 hsr_forward_do net/hsr/hsr_forward.c:-1 [inline] hsr_forward_skb+0xfbe/0x28c0 net/hsr/hsr_forward.c:743 send_hsr_supervision_frame+0x733/0xcf0 net/hsr/hsr_device.c:364 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x225/0x840 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:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:finish_task_switch+0x417/0xc60 kernel/sched/core.c:5361 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 43 7b 24 0a e8 ae bc 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc9000377f7c0 EFLAGS: 00000202 RAX: 0000000000000161 RBX: ffff88801fc3bf20 RCX: 0000000080000001 RDX: 0000000000000006 RSI: ffffffff8dfe8e81 RDI: ffffffff8c2ac780 RBP: ffffc9000377f810 R08: ffffffff90331df7 R09: 1ffffffff20663be R10: dffffc0000000000 R11: fffffbfff20663bf R12: ffff888039a5a540 R13: ffff88801fc3bee8 R14: dffffc0000000000 R15: 1ffff11003f877e4 context_switch kernel/sched/core.c:5513 [inline] __schedule+0x17e1/0x56c0 kernel/sched/core.c:7234 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7413 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 smp_call_function_single+0x46e/0x5a0 kernel/smp.c:704 task_function_call kernel/events/core.c:124 [inline] perf_install_in_context+0x5bd/0x900 kernel/events/core.c:3203 __do_sys_perf_event_open kernel/events/core.c:14239 [inline] __se_sys_perf_event_open+0x1906/0x1d40 kernel/events/core.c:13881 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f111a19ce59 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:00007f111b0f9028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f111a415fa0 RCX: 00007f111a19ce59 RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f111a232e6f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f111a416038 R14: 00007f111a415fa0 R15: 00007ffe2b7b0cb8 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.