From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f2.google.com (mail-oo2-f2.google.com [74.125.231.130]) (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 76878242D97 for ; Thu, 10 Sep 2026 22:34:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789079677; cv=none; b=seTNcUJrqTDn+5z/E5vPoDARw5SvLkdr7ejboT4vfJaYZUB0z006PfrnvckwPf8hksVHGJvgiTCiBViGNAVJfs7iTMtcMY0gR9dMCfj70043au+t7vehIASwwpuEx6/pe7EYwa+GZWHU9igVb+VN2ACq2RkKHITwYG8yja7GMYI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789079677; c=relaxed/simple; bh=6jk1HAam1tfwL9YR/123AGEX6XKmBuV9EnkeSKU3ZGs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=HrPxAoeWEgSpGCKzLn16UvNWqAIUe7OBKjPNwTf1zq9grpcPaZ9g8dsIP4fvB+eDW/hhwOxGLYwvSR6p9bx+VVdn2nhK86DdcwVUc0q3p690fyklAzljQUsogy3BZ9SXKR+ABWWABcKrcR84WXXRgg3+I1Pm6Ccy2PaUy4T+spA= 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=74.125.231.130 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-oo2-f2.google.com with SMTP id 46e09a7af769-801706d7e6dso97299a34.0 for ; Thu, 10 Sep 2026 15:34:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789079674; x=1789684474; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=IvsJaM4AM1J/BSbs4WDnUXlHpIg7NqoQiI+twfEHk0w=; b=GOe1SYHJEl0vDF5XUzKj9PsQfMzs3PpGCh/igSpr3XTse6PPT9WyemFLe220XjRW2M CKMmO79+azLo9pamGhcNeQg9dsiebZRtrdR3J4Tc8xn8B95cV+6CX7zWIJke94hnws3B OZxCbk4JHdhwLKyMK8odNV3y1dHsFVNjj9BTCqY3rCtDF9ZtiBB9WP1AWEo8A513Zq5G ayulL5L6WPR6zqwDcOaNPf/gKLCjcrZo2/hRiUmUwN9SoaDcyj/5LMA2FmwawUtyAHPA Tm2kLPqx5oeZYQFGnNH9hO3MHvQ0KtUZZl/Vrg9vq+sf8Xs6jN5jCXs/YHmxl5e9XvzO xEug== X-Gm-Message-State: AFuF++nceSh7w8ChLtzbvgf3qEiNXsXq7XR/0HirMalSIOeLMyjBRba/ KNqp1Y8Xq6xKI9o7H/ounvrmLMTwk9MoVAZXKLLZ8HpKrgHGH5utX7kuHLqy35A5PoFZmYCbasM MzlP5dLqQZEUSe5VicV1CIRwMTB4P4VG6QjWEjJ3vLxQ+2RTZWaY8cxlHN/h3Pg== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c2cd:20b0:6be:31b7:e684 with SMTP id 006d021491bc7-6c0bc7c476emr621867eaf.34.1789079674304; Thu, 10 Sep 2026 15:34:34 -0700 (PDT) Date: Thu, 10 Sep 2026 15:34:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa3307a.6e6c5f9e.28f11f.003a.GAE@google.com> Subject: [syzbot] [kernel?] WARNING: locking bug in finish_task_switch (3) From: syzbot To: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 1fc5a74b108f Merge tag 'kmalloc_obj-v7.3-rc2' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f2ccf9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e dashboard link: https://syzkaller.appspot.com/bug?extid=b5ddc2aecb8d1b29c871 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8955e485c188/disk-1fc5a74b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a91efe973539/vmlinux-1fc5a74b.xz kernel image: https://storage.googleapis.com/syzbot-assets/92b415d78cae/bzImage-1fc5a74b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b5ddc2aecb8d1b29c871@syzkaller.appspotmail.com usb 9-1: Quirk or no altset; falling back to MIDI 1.0 usb 9-1: USB disconnect, device number 97 ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#0: kworker/0:10/9284 WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4895 [inline], CPU#0: kworker/0:10/9284 WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x584/0x2e50 kernel/locking/lockdep.c:5204, CPU#0: kworker/0:10/9284 Modules linked in: CPU: 0 UID: 0 PID: 9284 Comm: kworker/0:10 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: sock_diag_events sock_diag_broadcast_destroy_work RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4895 [inline] RIP: 0010:__lock_acquire+0x58b/0x2e50 kernel/locking/lockdep.c:5204 Code: fa 18 00 74 04 31 c9 eb 2d 90 e8 00 91 37 03 85 c0 74 1c 83 3d 89 26 d7 0e 00 75 13 48 8d 3d 3c 2f da 0e 48 c7 c6 5e d9 59 8e <67> 48 0f b9 3a 90 31 c9 48 8b 3c 24 0f b6 81 c4 00 00 00 84 c0 0f RSP: 0018:ffffc900034373b8 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff88802cb369e0 RCX: ffff88802cb35dc0 RDX: 0000000040000000 RSI: ffffffff8e59d95e RDI: ffffffff907d5240 RBP: 0000000000000002 R08: ffffffff907a4983 R09: 1ffffffff20f4930 R10: dffffc0000000000 R11: fffffbfff20f4931 R12: 00000000ffffff05 R13: 0000000000000000 R14: ffff88802cb369e8 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff888124cd8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000024c030 CR3: 000000007442c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000400 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 finish_lock_switch kernel/sched/core.c:5248 [inline] finish_task_switch+0x16e/0xc60 kernel/sched/core.c:5369 context_switch kernel/sched/core.c:5523 [inline] __schedule+0x17e3/0x58f0 kernel/sched/core.c:7270 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x910 kernel/entry/common.c:167 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679 RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5913 Code: ff ff ff e8 20 39 41 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 72 64 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 cf 3c 44 0a cc 48 8d 3d f7 35 da RSP: 0018:ffffc90003437920 EFLAGS: 00000292 RAX: 4cc9e7c7ad94c500 RBX: 0000000000000001 RCX: 0000000000000046 RDX: ffffffff94482fa8 RSI: ffffffff8e6fd430 RDI: ffffffff8c6d9480 RBP: ffff88802cb35dc0 R08: 0000000000000008 R09: ffffffff96e17510 R10: 00000000ab51b954 R11: 000000009f2f398b R12: ffff888044880f60 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000246 lock_sock_fast include/net/sock.h:1744 [inline] tcp_get_info+0x261/0x2b70 net/ipv4/tcp.c:4250 inet_diag_handler_get_info+0x481/0x700 net/ipv4/inet_diag.c:1030 sock_diag_broadcast_destroy_work+0x1f4/0x3d0 net/core/sock_diag.c:162 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 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 ---------------- Code disassembly (best guess): 0: fa cli 1: 18 00 sbb %al,(%rax) 3: 74 04 je 0x9 5: 31 c9 xor %ecx,%ecx 7: eb 2d jmp 0x36 9: 90 nop a: e8 00 91 37 03 call 0x337910f f: 85 c0 test %eax,%eax 11: 74 1c je 0x2f 13: 83 3d 89 26 d7 0e 00 cmpl $0x0,0xed72689(%rip) # 0xed726a3 1a: 75 13 jne 0x2f 1c: 48 8d 3d 3c 2f da 0e lea 0xeda2f3c(%rip),%rdi # 0xeda2f5f 23: 48 c7 c6 5e d9 59 8e mov $0xffffffff8e59d95e,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: 31 c9 xor %ecx,%ecx 32: 48 8b 3c 24 mov (%rsp),%rdi 36: 0f b6 81 c4 00 00 00 movzbl 0xc4(%rcx),%eax 3d: 84 c0 test %al,%al 3f: 0f .byte 0xf --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup