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([2620:10d:c092:600::2:478]) by smtp.gmail.com with ESMTPSA id m18-20020a05600c4f5200b003c6b70a4d69sm24250325wmq.42.2023.01.12.02.39.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Jan 2023 02:39:12 -0800 (PST) Message-ID: <541f398a-1ac2-3cc8-33cc-eda9511c7e2e@gmail.com> Date: Thu, 12 Jan 2023 10:37:44 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: Re: [syzbot] WARNING: ODEBUG bug in __io_put_task Content-Language: en-US To: syzbot , axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <00000000000098a61b05f20e62db@google.com> From: Pavel Begunkov In-Reply-To: <00000000000098a61b05f20e62db@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 1/12/23 10:14, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=14d269ce480000 > kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 > dashboard link: https://syzkaller.appspot.com/bug?extid=1aa0bce76589e2e98756 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. #syz test: git://git.kernel.dk/linux.git syztest > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz > kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1aa0bce76589e2e98756@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > ODEBUG: free active (active state 1) object: ffff88801fe06ca8 object type: rcu_head hint: 0x0 > WARNING: CPU: 0 PID: 6765 at lib/debugobjects.c:509 debug_print_object+0x194/0x2c0 lib/debugobjects.c:509 > Modules linked in: > CPU: 0 PID: 6765 Comm: kworker/0:29 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 > Workqueue: events io_fallback_req_func > RIP: 0010:debug_print_object+0x194/0x2c0 lib/debugobjects.c:509 > Code: df 48 89 fe 48 c1 ee 03 80 3c 16 00 0f 85 c7 00 00 00 48 8b 14 dd c0 dc a6 8a 50 4c 89 ee 48 c7 c7 80 d0 a6 8a e8 00 79 ae 05 <0f> 0b 58 83 05 ce 27 66 0a 01 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e > RSP: 0018:ffffc900057df950 EFLAGS: 00010286 > RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 > RDX: ffff88807d03d7c0 RSI: ffffffff8166972c RDI: fffff52000afbf1c > RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8a4dd0a0 > R13: ffffffff8aa6d580 R14: ffff88802a8da408 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055574b30e000 CR3: 000000001ddab000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __debug_check_no_obj_freed lib/debugobjects.c:996 [inline] > debug_check_no_obj_freed+0x305/0x420 lib/debugobjects.c:1027 > slab_free_hook mm/slub.c:1756 [inline] > slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1807 > slab_free mm/slub.c:3787 [inline] > kmem_cache_free+0xec/0x4e0 mm/slub.c:3809 > put_task_struct_many include/linux/sched/task.h:125 [inline] > __io_put_task+0x155/0x1e0 io_uring/io_uring.c:725 > io_put_task io_uring/io_uring.h:328 [inline] > __io_req_complete_post+0x7ac/0xcd0 io_uring/io_uring.c:978 > io_req_complete_post+0xf1/0x1a0 io_uring/io_uring.c:992 > io_req_task_complete+0x189/0x260 io_uring/io_uring.c:1623 > io_poll_task_func+0xa95/0x1220 io_uring/poll.c:347 > io_fallback_req_func+0xfd/0x204 io_uring/io_uring.c:252 > process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 > worker_thread+0x669/0x1090 kernel/workqueue.c:2440 > kthread+0x2e8/0x3a0 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > > > --- > 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. -- Pavel Begunkov