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Thu, 29 Aug 2024 16:30:02 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFf4IbX8pjDuJ17LiI0JESNcEAoJRqhux2YvDF/r066A854/JgY5hubPEp2jNebzjXmKDOTnfmPI6BBhhT4kJo= X-Received: by 2002:a17:90a:b009:b0:2d3:d7b9:2c7e with SMTP id 98e67ed59e1d1-2d8561e2311mr5153811a91.24.1724974201770; Thu, 29 Aug 2024 16:30:01 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: In-Reply-To: From: Xingyu Li Date: Thu, 29 Aug 2024 16:29:50 -0700 Message-ID: Subject: Re: BUG: WARNING in kvfree_rcu_bulk To: Uladzislau Rezki Cc: paulmck@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joel@joelfernandes.org, josh@joshtriplett.org, boqun.feng@gmail.com, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang1211@gmail.com, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Yu Hao Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Here is the config file: https://gist.github.com/TomAPU/64f5db0fe976a3e94a6dd2b621887cdd On Thu, Aug 29, 2024 at 1:17=E2=80=AFAM Uladzislau Rezki = wrote: > > Hello! > > > Hi, > > > > We found a bug in Linux 6.10 using syzkaller. It is possibly a task hu= ng bug. > > The reprodcuer is > > https://gist.github.com/freexxxyyy/67172235de920ccf2f282f9e1179354d > > > > The bug report is: > > > > ------------[ cut here ]------------ > > ODEBUG: active_state not available (active state 0) object: > > ffff88802526c180 object type: rcu_head hint: 0x0 > > WARNING: CPU: 0 PID: 4497 at lib/debugobjects.c:517 debug_print_object > > lib/debugobjects.c:514 [inline] > > WARNING: CPU: 0 PID: 4497 at lib/debugobjects.c:517 > > debug_object_active_state+0x2b0/0x360 lib/debugobjects.c:954 > > Modules linked in: > > CPU: 0 PID: 4497 Comm: kworker/0:3 Not tainted 6.10.0 #13 > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04= /01/2014 > > Workqueue: events kfree_rcu_work > > RIP: 0010:debug_print_object lib/debugobjects.c:514 [inline] > > RIP: 0010:debug_object_active_state+0x2b0/0x360 lib/debugobjects.c:954 > > Code: d7 95 fd 4d 8b 0c 24 48 c7 c7 a0 61 a9 8b 48 c7 c6 60 5e a9 8b > > 48 89 ea 8b 4c 24 04 49 89 d8 41 57 e8 24 1b f7 fc 48 83 c4 08 <0f> 0b > > ff 05 88 0c c6 0a 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d > > RSP: 0018:ffffc90002cc7a10 EFLAGS: 00010292 > > RAX: f9c69a923cadb800 RBX: ffff88802526c180 RCX: ffff88801e3cbc00 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: ffffffff8ba96360 R08: ffffffff8155a25a R09: 1ffff1100c74519a > > R10: dffffc0000000000 R11: ffffed100c74519b R12: ffffffff8b4de5c0 > > R13: 0000000000000005 R14: dffffc0000000000 R15: 0000000000000000 > > FS: 0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:00000000000= 00000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007fa7a316ef78 CR3: 000000000d932000 CR4: 0000000000350ef0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > > > debug_rcu_head_unqueue kernel/rcu/rcu.h:236 [inline] > > debug_rcu_bhead_unqueue kernel/rcu/tree.c:3287 [inline] > > kvfree_rcu_bulk+0xc5/0x4d0 kernel/rcu/tree.c:3364 > > kfree_rcu_work+0x443/0x500 kernel/rcu/tree.c:3450 > > process_one_work kernel/workqueue.c:3248 [inline] > > process_scheduled_works+0x977/0x1410 kernel/workqueue.c:3329 > > worker_thread+0xaa0/0x1020 kernel/workqueue.c:3409 > > kthread+0x2eb/0x380 kernel/kthread.c:389 > > ret_from_fork+0x49/0x80 arch/x86/kernel/process.c:147 > > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 > > > > > Is your kernel configuration special? I mean should i have something > truly enabled in the .config to reproduce it? > > Thank you for the report! > > -- > Uladzislau Rezki --=20 Yours sincerely, Xingyu