From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (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 325B0448CEC for ; Mon, 17 Aug 2026 16:04:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786982672; cv=none; b=JAhgw17UYk6AG48QZDwXq6U1cRzCHs1tOpmpKue5rfw3ruNG1EOn2WvZGaJoLdBGxoWkidTKpIAWGWb9b9YzyzmUi4WcdBqKVgKZB47Q64E3pq6uhYNy2pDV/H3toPro/akeCCkbxbY24jukh9WP9MVw13XVJr3aXQXdRGHK6wY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786982672; c=relaxed/simple; bh=GQFC5R8grBv+ul5qZwTRk3qJ8b31EsBWOywkSxLClxg=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kewnhoucTdzgVBz5ztYQsyeCr0Ef5NS4vV/mZUIVHLEcmDPNyqTluYx8xls3Jkx3Su6CV/SYKF6FYHJgL9CPC+VqAQR6N5OR8MJx29dkl49mwAZwFRgdYi+1qaV+6jWdGIkjXX/E+ym9sBIPbwMJPx4AciaXnh8H9Eygdfzzau4= 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=209.85.167.198 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-f198.google.com with SMTP id 5614622812f47-4b28db6c77aso716551b6e.3 for ; Mon, 17 Aug 2026 09:04:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786982669; x=1787587469; 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=iOl0x0fA4Fcv6aj2YjEarOiDOQh5ZB57bKWTQO38RNE=; b=XGuTxpSUeFUvAylxIGe2IxxJ3TS2JHfA3zv6PJ8AZxtZq1+o8DcImoLTUJdPspsPqs hYZz3f61r+428uuQmA3GnTgzFiLaHdDI1/SIrtL4zInPY8MXQjvfX4IfRXT1W2aZX2Lc LT0NMfU9Z3qrMS35dkPy+kBL070M9zEQVuCc6fkq8iSUOTUNaIDBH6sU3wneCiyyhE3I +fVW1Q4Vns/6ZWYAOMe1GEKT1edEsUR2kHoir/y08whVT3pSj3cDpEmP04+wJ0PC5SFv lw7EwIt6bZk3BtLwi0JgcqbsQ+g0eJ1Vj7nU0Hyi73aMC50aKstBASoLg4GMNmBMOogK v8GQ== X-Gm-Message-State: AOJu0Yz8TjiKvfesIvRQCC9wwUxPX3xcLnxh9R1JnPJVjDH0Ya9r0pxZ LLKP3ic0/uvL2jSnyh1syPRYdLgKukzjLAfbAxyx2UsXZMqQL2uVvo35/sWzemD5LeduTH6Cvz6 PpIoUUd1lVfAudQakBA7aMkByJ8JBlF7xZ2E7kVNATaVDM9r2Od4ENMjHW+Q= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:898f:10b0:4b2:646f:3e8a with SMTP id 5614622812f47-4b2646f64a4mr11622249b6e.9.1786982669087; Mon, 17 Aug 2026 09:04:29 -0700 (PDT) Date: Mon, 17 Aug 2026 09:04:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a83310d.dbb3a75c.20434b.0069.GAE@google.com> Subject: [syzbot] [kernel?] BUG: soft lockup in gate_timer_func From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 21d6ac051080 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=10a50679580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=0054fed3dc9085390f51 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15911a25580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0054fed3dc9085390f51@syzkaller.appspotmail.com watchdog: BUG: soft lockup - CPU#1 stuck for 3s! [syz-executor291:5020] Modules linked in: irq event stamp: 4562887 hardirqs last enabled at (4562886): [] seqcount_lockdep_reader_access+0x7c/0xf8 include/linux/seqlock.h:75 hardirqs last disabled at (4562887): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (4562887): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (14246): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (14249): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 5020 Comm: syz-executor291 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 43400005 (nZcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : seqcount_lockdep_reader_access+0xd8/0xf8 include/linux/seqlock.h:76 lr : seqcount_lockdep_reader_access+0xd4/0xf8 include/linux/seqlock.h:75 sp : ffff80008eb77ce0 x29: ffff80008eb77ce0 x28: 1fffe00034bbc63a x27: ffff80008e853110 x26: dfff800000000000 x25: ffff0000c1b62b80 x24: 1fffe0001ad59fa6 x23: dfff800000000000 x22: ffff0000c1b62bb0 x21: 0000000000000000 x20: ffff8000805580e8 x19: 00000000000000c0 x18: 0000000000000000 x17: ffff80008a7d6000 x16: 0000000000000002 x15: ffff80008a35fda0 x14: ffff80008a5d5e28 x13: 0000000000000001 x12: ffff0000d5af8000 x11: ffff80008a5d5e28 x10: 0000000000000003 x9 : 0000000000000101 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080557cd4 x2 : 0000000000000080 x1 : ffff0000d5af8000 x0 : 0000000000000000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) seqcount_lockdep_reader_access+0xd8/0xf8 include/linux/seqlock.h:75 (P) ktime_get+0x68/0x218 kernel/time/timekeeping.c:971 gate_get_time+0x1c/0xa4 net/sched/act_gate.c:23 gate_timer_func+0x1a8/0x390 net/sched/act_gate.c:101 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x314/0xbe0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x15c/0x21c kernel/time/hrtimer.c:2113 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:455 (P) local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xb8/0x690 net/core/skbuff.c:6775 sock_alloc_send_pskb+0x740/0x850 net/core/sock.c:3012 unix_dgram_sendmsg+0x434/0x1078 net/unix/af_unix.c:2137 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:790 __sys_sendto+0x250/0x328 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __arm64_sys_sendto+0xec/0x10c net/socket.c:2255 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 0 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0xd0/0xfc kernel/sched/idle.c:129 watchdog: BUG: soft lockup - CPU#1 stuck for 6s! [syz-executor291:5020] Modules linked in: irq event stamp: 9755971 hardirqs last enabled at (9755970): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (9755970): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (9755971): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (9755971): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (14246): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (14249): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 5020 Comm: syz-executor291 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 sp : ffff80008eb77dc0 x29: ffff80008eb77dc0 x28: 1fffe00034bbc63a x27: ffff0001a5de31c0 x26: ffff0001a5de31d0 x25: ffff0000d6acfd38 x24: dfff800000000000 x23: 0000000000000001 x22: ffff800084ec6bfc x21: ffff0001a5de2d80 x20: ffff0001a5de2d80 x19: 0000000000000000 x18: 0000000000000000 x17: ffff80008a7d6000 x16: 0000000000000004 x15: ffff80008a35fda0 x14: 000000008030dda8 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080156070 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080156118 x2 : 0000000000000000 x1 : ffff0000d5af8000 x0 : ffff80011d2fd000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P) __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x22c/0xbe0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x15c/0x21c kernel/time/hrtimer.c:2113 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:455 (P) local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xb8/0x690 net/core/skbuff.c:6775 sock_alloc_send_pskb+0x740/0x850 net/core/sock.c:3012 unix_dgram_sendmsg+0x434/0x1078 net/unix/af_unix.c:2137 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:790 __sys_sendto+0x250/0x328 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __arm64_sys_sendto+0xec/0x10c net/socket.c:2255 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 0 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0xd0/0xfc kernel/sched/idle.c:129 watchdog: BUG: soft lockup - CPU#1 stuck for 9s! [syz-executor291:5020] Modules linked in: irq event stamp: 14939657 hardirqs last enabled at (14939656): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (14939656): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (14939657): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (14939657): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (14246): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (14249): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 5020 Comm: syz-executor291 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 sp : ffff80008eb77dc0 x29: ffff80008eb77dc0 x28: 1fffe00034bbc63a x27: ffff0001a5de31c0 x26: ffff0001a5de31d0 x25: ffff0000d6acfd38 x24: dfff800000000000 x23: 0000000000000001 x22: ffff800084ec6bfc x21: ffff0001a5de2d80 x20: ffff0001a5de2d80 x19: 0000000000000000 x18: 0000000000000000 x17: ffff80008a7d6000 x16: 0000000000000004 x15: ffff80008a35fda0 x14: 000000008030dda8 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080156070 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080156118 x2 : 0000000000000000 x1 : ffff0000d5af8000 x0 : ffff80011d2fd000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P) __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x22c/0xbe0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x15c/0x21c kernel/time/hrtimer.c:2113 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:455 (P) local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xb8/0x690 net/core/skbuff.c:6775 sock_alloc_send_pskb+0x740/0x850 net/core/sock.c:3012 unix_dgram_sendmsg+0x434/0x1078 net/unix/af_unix.c:2137 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:790 __sys_sendto+0x250/0x328 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __arm64_sys_sendto+0xec/0x10c net/socket.c:2255 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 0 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0xd0/0xfc kernel/sched/idle.c:129 watchdog: BUG: soft lockup - CPU#1 stuck for 12s! [syz-executor291:5020] Modules linked in: irq event stamp: 20130019 hardirqs last enabled at (20130018): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (20130018): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (20130019): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (20130019): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (14246): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (14249): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 5020 Comm: syz-executor291 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 sp : ffff80008eb77dc0 x29: ffff80008eb77dc0 x28: 1fffe00034bbc63a x27: ffff0001a5de31c0 x26: ffff0001a5de31d0 x25: ffff0000d6acfd38 x24: dfff800000000000 x23: 0000000000000001 x22: ffff800084ec6bfc x21: ffff0001a5de2d80 x20: ffff0001a5de2d80 x19: 0000000000000000 x18: 0000000000000000 x17: ffff80008a7d6000 x16: 0000000000000004 x15: ffff80008a35fda0 x14: 000000008030dda8 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080156070 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080156118 x2 : 0000000000000000 x1 : ffff0000d5af8000 x0 : ffff80011d2fd000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P) __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x22c/0xbe0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x15c/0x21c kernel/time/hrtimer.c:2113 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:455 (P) local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xb8/0x690 net/core/skbuff.c:6775 sock_alloc_send_pskb+0x740/0x850 net/core/sock.c:3012 unix_dgram_sendmsg+0x434/0x1078 net/unix/af_unix.c:2137 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:790 __sys_sendto+0x250/0x328 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __arm64_sys_sendto+0xec/0x10c net/socket.c:2255 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 0 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0xd0/0xfc kernel/sched/idle.c:129 --- 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 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. 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