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Fri, 29 Nov 2024 23:01:01 -0800 (PST) Date: Fri, 29 Nov 2024 23:01:01 -0800 In-Reply-To: <7a8955d4-4283-426f-8bbf-8f81787fb08e@suse.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <674ab82d.050a0220.253251.00d8.GAE@google.com> Subject: Re: [syzbot] [btrfs?] kernel BUG in __folio_start_writeback From: syzbot To: akpm@linux-foundation.org, clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org, wqu@suse.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 7B7FA40020 X-Stat-Signature: wmqjfp3o5x6wbhut5xam6rf9udbq7mmg X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1732950053-263976 X-HE-Meta: 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 EUH4yb/N 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: MAX_LOCKDEP_KEYS too low! BUG: MAX_LOCKDEP_KEYS too low! turning off the locking correctness validator. CPU: 1 UID: 0 PID: 18394 Comm: syz-executor388 Not tainted 6.12.0-rc7-syzkaller-00133-g17a4e91a431b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 register_lock_class+0x827/0x980 kernel/locking/lockdep.c:1328 __lock_acquire+0xf3/0x2100 kernel/locking/lockdep.c:5077 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 touch_wq_lockdep_map+0xc7/0x170 kernel/workqueue.c:3880 __flush_workqueue+0x14f/0x1600 kernel/workqueue.c:3922 drain_workqueue+0xc9/0x3a0 kernel/workqueue.c:4086 destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5830 btrfs_stop_all_workers+0xbb/0x2a0 fs/btrfs/disk-io.c:1782 close_ctree+0x6bb/0xd60 fs/btrfs/disk-io.c:4360 generic_shutdown_super+0x139/0x2d0 fs/super.c:642 kill_anon_super+0x3b/0x70 fs/super.c:1237 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2112 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f378bf8c357 Code: 08 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd4c441108 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f378bf8c357 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd4c4411c0 RBP: 00007ffd4c4411c0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd4c442280 R13: 00005555591197d0 R14: 431bde82d7b634db R15: 00007ffd4c442224 BTRFS info (device loop2): last unmount of filesystem bf719321-eb1f-43c1-9145-be0044cdbc04 BTRFS info (device loop2): last unmount of filesystem 454c899b-20f1-4098-b6bd-9b424eb38c60 BTRFS info (device loop2): last unmount of filesystem e789dab4-7b2e-44bb-bb97-19a8dd7be099 BTRFS info (device loop2): last unmount of filesystem a11fd0de-3a92-4478-af85-4e70dfb2fb44 BTRFS info (device loop2): last unmount of filesystem 85ccfa0b-566f-4eb9-b1a6-ea2fe97ca044 BTRFS info (device loop2): last unmount of filesystem 5a8c012e-dba3-4ff5-a22f-46e4b5bb2f55 BTRFS info (device loop2): last unmount of filesystem 2fe685f2-8834-419b-bd91-466d40ccece7 BTRFS info (device loop2): last unmount of filesystem fc366aaa-c1c0-4d55-9034-d39fce006f22 BTRFS info (device loop2): last unmount of filesystem 364312bb-b5a2-487f-aaa2-e36f3a1b701f BTRFS info (device loop2): last unmount of filesystem 14d642db-7b15-43e4-81e6-4b8fac6a25f8 Tested on: commit: 17a4e91a btrfs: test if we need to wait the writeback .. git tree: https://github.com/adam900710/linux.git writeback_fix console output: https://syzkaller.appspot.com/x/log.txt?x=1501b9e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa4954ad2c62b915 dashboard link: https://syzkaller.appspot.com/bug?extid=aac7bff85be224de5156 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.