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 A6CA4376BE8 for ; Tue, 3 Mar 2026 08:41:28 +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=1772527290; cv=none; b=cVEPbO5dwotRAvehem33Tv9BLY50VI1piylkKobzSqIQ6b/6kvF+toNXUfJyWm8wAFiq53rqWifRdvW1JpMpRAZTSlNpMomd4sYzkipdOsCJ6NiUM2T84sePrQmQXdYHjdL67ZzFh6Gc/IQuKp5tHr5JHs09jwNo4wIr44lb1fQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772527290; c=relaxed/simple; bh=3zwfXioCCkBXYPH8EF18jBZx4zxXNGAXbllE5PJOljo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=VRdbu4/7bDrAFcBe6aYndMc92fI6/YAdjm1m95QTP+SSoNHrrf3vAPftKRoUe0rrFATK4EHDQa1zgzKRkjvb/cpE7NFB45aegdrHgXPYS0V813p551sYSfjtEv7J3BlExKHi8vLHpah/CozJyJf9xplS5kAKqbrfwWo+Rfx/c6A= 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 5614622812f47-463967f3573so25306111b6e.1 for ; Tue, 03 Mar 2026 00:41:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772527287; x=1773132087; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=gVi4tpV4O9olpo0RRrzD1vhvqHxvubnsRs9fNmWiDMs=; b=ZKfeWMYkqJ61x1oNdB6JnSMpTEO83GcaVXPyeTqdfZLWpSe01bo9ym+AE11IEFTf0F FbLaSolZC+2IgZ1BjGyHk5sJp0DkYvilBWqvsBuNYTYbd2ZPcU+iy5EFy8OrWMry8ee5 MWRwxTNVGfd4ZlA0NAuQ5nJuo0wyZFmYLoLY4+DnvL1yTb36N+VJtsMv+YmQkE8Fw7hv Mc5eH3Vs5zNhKhwGThZFpClkSYIuGj1Lh7YlM5QzgKmoO3GqbSOe8CL9XVMkxees1978 14cQZpT0QoTcBUB/XtnKmhQWlSFm2U1zPXb91UIrf7K2GZo07OpuRdfM2jgEzj/hamG2 RtQw== X-Forwarded-Encrypted: i=1; AJvYcCXsPoM0CgCUGpYcNrUHYjc22JDq2uM5XF1cEV2MCmOQkopALwFOi8468Y2TRrjbDGrX6qkfbpHcbZuJy4A=@vger.kernel.org X-Gm-Message-State: AOJu0Yxw35NdkWIKIapesPnyIpiCBvHadTDjTnMTWw5lOMsNRVpyeUio cyCV72Gg7sqP4KWZn6wgiqC1cXvPOXqLyIhJL9sivGSOeDoE1BO/Jyr9E6B5K+K8UXtFh2icaUn kyguc6mEq+YWe7yr+9d7avdqdFjx1jl5j0Fyj8sT1o4rAJk+M+u0ubk6egRk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1794:b0:679:a650:cc0b with SMTP id 006d021491bc7-679faf3393amr8894641eaf.51.1772527287534; Tue, 03 Mar 2026 00:41:27 -0800 (PST) Date: Tue, 03 Mar 2026 00:41:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a69eb7.a70a0220.135158.0008.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in __dentry_kill From: syzbot To: akpm@linux-foundation.org, hannes@cmpxchg.org, jackmanb@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2f9339c052bd Merge tag 'spi-fix-v7.0-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17ee2d5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=af6ed0125ed44356 dashboard link: https://syzkaller.appspot.com/bug?extid=f8ccdac0a7eede0e1ae5 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/80058c3aa6af/disk-2f9339c0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b80f7bb94c82/vmlinux-2f9339c0.xz kernel image: https://storage.googleapis.com/syzbot-assets/2aca3560fd76/bzImage-2f9339c0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f8ccdac0a7eede0e1ae5@syzkaller.appspotmail.com bridge0: received packet on veth0_to_bridge with own address as source address (addr:8a:88:71:a0:4a:94, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10337/1:b..l P10386/1:b..l rcu: (detected by 1, t=10503 jiffies, g=42749, q=1178 ncpus=2) task:syz.1.1104 state:R running task stack:26792 pid:10386 tgid:10385 ppid:5832 task_flags:0x40054c flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0xfee/0x60e0 kernel/sched/core.c:6907 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7091 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:389 [inline] zap_pte_range mm/memory.c:1959 [inline] zap_pmd_range mm/memory.c:2021 [inline] zap_pud_range mm/memory.c:2049 [inline] zap_p4d_range mm/memory.c:2070 [inline] unmap_page_range+0x152f/0x4840 mm/memory.c:2091 unmap_single_vma+0x153/0x240 mm/memory.c:2133 unmap_vmas+0x295/0x590 mm/memory.c:2171 exit_mmap+0x1ef/0xa30 mm/mmap.c:1302 __mmput+0x12a/0x410 kernel/fork.c:1174 mmput+0x67/0x80 kernel/fork.c:1197 exit_mm kernel/exit.c:581 [inline] do_exit+0x78a/0x2aa0 kernel/exit.c:959 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f663f59c799 RSP: 002b:00007f6640521028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: fffffffffffffffc RBX: 00007f663f815fa0 RCX: 00007f663f59c799 RDX: 0000000000000017 RSI: ffffffffffff0005 RDI: 0000000000000000 RBP: 00007f663f632bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f663f816038 R14: 00007f663f815fa0 R15: 00007ffe16d21cd8 task:syz.3.1088 state:R running task stack:26216 pid:10337 tgid:10337 ppid:5827 task_flags:0x40064c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0xfee/0x60e0 kernel/sched/core.c:6907 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7234 irqentry_exit+0x17b/0x670 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217 Code: 05 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 d1 30 88 09 8b 82 54 16 00 00 85 c0 74 f1 8b 82 30 16 00 00 <83> f8 02 75 e6 48 8b 8a 38 16 00 00 8b 92 34 16 00 00 48 8b 01 48 RSP: 0000:ffffc90004ba7188 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffea0001354c80 RCX: ffffffff827e8e11 RDX: ffff888020f90000 RSI: ffffffff827e8b0d RDI: ffff888020f90000 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000001640274 R14: 0000000000000000 R15: 0000000002b60289 __update_page_owner_free_handle.isra.0+0x6d/0x4d0 mm/page_owner.c:284 __reset_page_owner+0x93/0x190 mm/page_owner.c:321 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xaea/0x1790 mm/page_alloc.c:3040 folios_put_refs+0x53c/0x840 mm/swap.c:1002 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x39e/0xbd0 mm/shmem.c:1407 evict+0x3c2/0xad0 fs/inode.c:846 iput_final fs/inode.c:1966 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2015 iput+0x35/0x40 fs/inode.c:1981 dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467 __dentry_kill+0x1d0/0x600 fs/dcache.c:670 finish_dput+0x76/0x480 fs/dcache.c:879 dput.part.0+0x456/0x570 fs/dcache.c:928 dput+0x1f/0x30 fs/dcache.c:920 __fput+0x519/0xb40 fs/file_table.c:477 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x829/0x2aa0 kernel/exit.c:971 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x1f8/0x670 kernel/entry/common.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x4021000 RSP: 002b:0000000000000009 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007f8bdda15fa0 RCX: 00007f8bdd79c799 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f8bdd832bd9 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8bdda16038 R14: 00007f8bdda15fa0 R15: 00007ffe5ae86398 bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8a:88:71:a0:4a:94, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8a:88:71:a0:4a:94, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8a:88:71:a0:4a:94, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8a:88:71:a0:4a:94, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) --- 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