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Fri, 23 Jan 2026 14:30:30 -0800 (PST) Date: Fri, 23 Jan 2026 14:30:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6973f686.a70a0220.35de72.0009.GAE@google.com> From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com X-Headers-End: 1vjQBX-0005x2-E5 Subject: [f2fs-dev] [syzbot] [f2fs?] INFO: task hung in process_one_work (5) X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hello, syzbot found the following issue on: HEAD commit: 59e4d31a0470 Merge branches 'for-next/core' and 'for-next/.. 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=12454e3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a dashboard link: https://syzkaller.appspot.com/bug?extid=5dd7feff22865a110a30 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14ba2b9a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15da1852580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/746a1d5c4188/disk-59e4d31a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2eefade79f10/vmlinux-59e4d31a.xz kernel image: https://storage.googleapis.com/syzbot-assets/140624ef24ed/Image-59e4d31a.gz.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/d9aeb36c73e1/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=179533fa580000) mounted in repro #2: https://storage.googleapis.com/syzbot-assets/2795c5404b6f/mount_6.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11856bfc580000) mounted in repro #3: https://storage.googleapis.com/syzbot-assets/c5955f1ccd09/mount_11.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=10ba2b9a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5dd7feff22865a110a30@syzkaller.appspotmail.com INFO: task kworker/u8:14:3572 blocked for more than 143 seconds. Workqueue: writeback wb_workfn (flush-7:1) writeback_sb_inodes+0x73c/0x16b4 fs/fs-writeback.c:2030 __writeback_inodes_wb+0xec/0x228 fs/fs-writeback.c:2107 wb_writeback+0x3c8/0xd70 fs/fs-writeback.c:2218 wb_check_old_data_flush fs/fs-writeback.c:2322 [inline] wb_do_writeback fs/fs-writeback.c:2375 [inline] wb_workfn+0xa08/0xdc0 fs/fs-writeback.c:2403 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 Not tainted syzkaller #0 Call trace: __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0xb4/0xc0 kernel/locking/rwsem.c:1591 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 1 lock held by khungtaskd/32: 4 locks held by kworker/u8:2/41: 4 locks held by kworker/u8:3/42: 2 locks held by pr/ttyAMA-1/43: #2: ffff0000d49500e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:563 #2: ffff0000cb9880e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:563 4 locks held by kworker/u8:20/6003: #3: ffff0000e0531510 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2313 [inline] #3: ffff0000e0531510 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_balance_fs+0x4c0/0x6d8 fs/f2fs/segment.c:464 #0: ffff0000d535d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #0: ffff0000c1ff2948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009ee57be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 --- 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 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel