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Tue, 17 Aug 2021 07:41:25 -0700 (PDT) MIME-Version: 1.0 References: <0000000000007fcee205c970a843@google.com> In-Reply-To: <0000000000007fcee205c970a843@google.com> From: Miklos Szeredi Date: Tue, 17 Aug 2021 16:41:14 +0200 Message-ID: Subject: Re: [syzbot] INFO: task hung in fuse_launder_page To: syzbot Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs Content-Type: multipart/mixed; boundary="000000000000f5eae105c9c24f80" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000f5eae105c9c24f80 Content-Type: text/plain; charset="UTF-8" On Fri, 13 Aug 2021 at 15:16, syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 36a21d51725a Linux 5.14-rc5 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=104b8eaa300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e3a20bae04b96ccd > dashboard link: https://syzkaller.appspot.com/bug?extid=bea44a5189836d956894 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143c0ee9300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158fc9aa300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+bea44a5189836d956894@syzkaller.appspotmail.com > > INFO: task syz-executor276:8433 blocked for more than 143 seconds. > Not tainted 5.14.0-rc5-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor276 state:D stack:27736 pid: 8433 ppid: 8430 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4681 [inline] > __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 > schedule+0xd3/0x270 kernel/sched/core.c:6017 > fuse_wait_on_page_writeback fs/fuse/file.c:452 [inline] > fuse_wait_on_page_writeback+0x120/0x170 fs/fuse/file.c:448 > fuse_launder_page fs/fuse/file.c:2316 [inline] > fuse_launder_page+0xe9/0x130 fs/fuse/file.c:2306 > do_launder_page mm/truncate.c:595 [inline] > invalidate_inode_pages2_range+0x994/0xf80 mm/truncate.c:661 > fuse_finish_open+0x2d9/0x560 fs/fuse/file.c:202 > fuse_open_common+0x2f9/0x4c0 fs/fuse/file.c:254 > do_dentry_open+0x4c8/0x11d0 fs/open.c:826 > do_open fs/namei.c:3374 [inline] > path_openat+0x1c23/0x27f0 fs/namei.c:3507 > do_filp_open+0x1aa/0x400 fs/namei.c:3534 > do_sys_openat2+0x16d/0x420 fs/open.c:1204 > do_sys_open fs/open.c:1220 [inline] > __do_sys_creat fs/open.c:1294 [inline] > __se_sys_creat fs/open.c:1288 [inline] > __x64_sys_creat+0xc9/0x120 fs/open.c:1288 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x446409 > RSP: 002b:00007f0e6a9f92f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 > RAX: ffffffffffffffda RBX: 00000000004d34f0 RCX: 0000000000446409 > RDX: 0000000000446409 RSI: 0000000000000000 RDI: 0000000020000280 > RBP: 00000000004a3164 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e > R13: 000000000049f158 R14: 00000000004a1160 R15: 00000000004d34f8 Attached patch should fix this. #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --000000000000f5eae105c9c24f80 Content-Type: text/x-patch; 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