From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AB971487F4 for ; Fri, 1 Nov 2024 18:30:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730485831; cv=none; b=DF0mN2wUb2dznhovXsKvarSVV9jRVvmS5Hd2TH4gWMjp30rYd/9lmlyrb9k6yzJ0MvZll+o8qDHRuZFXUeu9VMnR9l4bfBNPA1S5TWxlNNIV9fMtDMGeS8lZYggNC7Cwy+P5/RvbAmxKcP6Wnk0y+LIKTQnIAyLGNSEC+MIAix0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730485831; c=relaxed/simple; bh=hMhLtfgNMQj1PEI+PV4Ney/g/RSDl8WEkYVehr2HcjE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=afulTFuaOzgJ+jD2G3zFt/wT7hh8lajTgsZbs3iVL15qlsVtsz1JlfJmxveNGD03RIwxfCCuCyrJ8xNq1J2Fny1gREadr/SXhCRvIaL52geCIRdakDEUcBDt73xTpC9u4maRXWrcs28TI5U7Tzfd2YPFGspk55ti7Ab3+7L2xsY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f197.google.com with SMTP id e9e14a558f8ab-3a6bb827478so3582935ab.0 for ; Fri, 01 Nov 2024 11:30:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730485828; x=1731090628; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=mXZkMAHnpIXfyycrTbEtoEDDVDS3caYnPnMLznmCHUI=; b=W/T1D+WjfgnNQFgqUq55f3XqsZWSaGNoGJlB+M6ryiuIwS97wJSIKuGSZs/t+hUpKg kC4keH5aG0n5FMZMSM0C1bPVl0vvinxVuDM2gTBKuSKFl5o+IGSC9/Wh7+nS1aRuavlk Ou7hKERKS4lv3FURQSVUomtEaL9FuIXFoSie5K2qfrSXh4nR9hv8E7hQhbK+l1bRB0Yr auCeO0YQUYbqaT5JpGicnOgpZSTH7lQzxzH9U1XepJroY9iEoWqH4U0awyALV05VYN3V EHomMRgtQ/6f1ABc/FbfH1kW5zLeroAqYptkuos9jHif/J4xzm7JtqByNkeBfI/guhbJ 85KQ== X-Forwarded-Encrypted: i=1; AJvYcCXPiXU/vD4vduCzpv1ubMc0u3BjA1ju5rxbhmIaQuiJex2EtCJO3cQH18sMB9cKCMvVieMxOOKgpXx4QqE=@vger.kernel.org X-Gm-Message-State: AOJu0YwVtfSWn+PdS6upsb2mq6zk3qxEcdoYREQPNMm5GXmx471rFxTL V17lmqGGmJxiHZ2W36yoaiizXe8KhIsmzP+17dB9nY3scKEZBfzrX21qdMaA7E1ZWt3DrR6+h5h CrkSYFk8WZyABQSlhrbuZEHiT/RGOnPY9WyityxEfOZ7tCgOLg7kEByA= X-Google-Smtp-Source: AGHT+IGlAZCR29LvVl/Bw4EdczNIXrtznxNgJldWArN9m9083uz8e9DPAVy/TbSX9BDQoFAhwVP5AV9gNp/WtI+BnoO6vHuaSE8F Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:20e6:b0:3a3:67b1:3080 with SMTP id e9e14a558f8ab-3a6b0251396mr50786425ab.7.1730485828656; Fri, 01 Nov 2024 11:30:28 -0700 (PDT) Date: Fri, 01 Nov 2024 11:30:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67251e44.050a0220.35b515.0174.GAE@google.com> Subject: [syzbot] [bcachefs?] WARNING: suspicious RCU usage in bucket_gen From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c1e939a21eb1 Merge tag 'cgroup-for-6.12-rc5-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10054630580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4aec7739e14231a7 dashboard link: https://syzkaller.appspot.com/bug?extid=39b80f215d9825867301 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c1e939a2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/79a07b922222/vmlinux-c1e939a2.xz kernel image: https://storage.googleapis.com/syzbot-assets/0a5d98e2bb0d/bzImage-c1e939a2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+39b80f215d9825867301@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 6.12.0-rc5-syzkaller-00044-gc1e939a21eb1 #0 Not tainted ----------------------------- fs/bcachefs/buckets.h:94 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 4 locks held by kworker/u4:11/3443: #0: ffff88801ac79148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac79148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000e0ffd00 ((work_completion)(&rbio->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000e0ffd00 ((work_completion)(&rbio->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff88804fa84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #2: ffff88804fa84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #2: ffff88804fa84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3215 #3: ffff88804f35c128 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked fs/bcachefs/btree_locking.h:194 [inline] #3: ffff88804f35c128 (bcachefs_btree){+.+.}-{0:0}, at: bch2_trans_begin+0x9b0/0x1c00 fs/bcachefs/btree_iter.c:3112 stack backtrace: CPU: 0 UID: 0 PID: 3443 Comm: kworker/u4:11 Not tainted 6.12.0-rc5-syzkaller-00044-gc1e939a21eb1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events_unbound bch2_rbio_retry Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x226/0x340 kernel/locking/lockdep.c:6821 bucket_gens fs/bcachefs/buckets.h:90 [inline] bucket_gen+0x200/0x220 fs/bcachefs/buckets.h:99 read_from_stale_dirty_pointer+0x513/0xca0 fs/bcachefs/io_read.c:805 __bch2_read_extent+0x994/0x4880 fs/bcachefs/io_read.c:896 __bch2_read+0x1094/0x1f70 fs/bcachefs/io_read.c:1212 bch2_rbio_retry+0x3bd/0x1340 fs/bcachefs/io_read.c:478 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 bcachefs (loop0): Attempting to read from stale dirty pointer: u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale memory gen: 1 u64s 13 type alloc_v4 0:34:0 len 0 ver 0: gen 1 oldest_gen 0 data_type free journal_seq 0 need_discard 0 need_inc_gen 0 dirty_sectors 0 stripe_sectors 0 cached_sectors 0 stripe 0 stripe_redundancy 0 io_time[READ] 1 io_time[WRITE] 1280 fragmentation 0 bp_start 8 bcachefs (loop0 inum 4099 offset 0): no device to read from: no_device_to_read_from u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale bcachefs (loop0 inum 4099 offset 0): read error 3 from btree lookup bcachefs (loop0): Attempting to read from stale dirty pointer: u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale memory gen: 1 u64s 13 type alloc_v4 0:34:0 len 0 ver 0: gen 1 oldest_gen 0 data_type free journal_seq 0 need_discard 0 need_inc_gen 0 dirty_sectors 0 stripe_sectors 0 cached_sectors 0 stripe 0 stripe_redundancy 0 io_time[READ] 1 io_time[WRITE] 1280 fragmentation 0 bp_start 8 bcachefs (loop0 inum 4099 offset 0): no device to read from: no_device_to_read_from u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale bcachefs (loop0 inum 4099 offset 0): read error 3 from btree lookup bcachefs (loop0): Attempting to read from stale dirty pointer: u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale memory gen: 1 u64s 13 type alloc_v4 0:34:0 len 0 ver 0: gen 1 oldest_gen 0 data_type free journal_seq 0 need_discard 0 need_inc_gen 0 dirty_sectors 0 stripe_sectors 0 cached_sectors 0 stripe 0 stripe_redundancy 0 io_time[READ] 1 io_time[WRITE] 1280 fragmentation 0 bp_start 8 bcachefs (loop0 inum 4099 offset 0): no device to read from: no_device_to_read_from u64s 7 type extent 4099:8:U32_MAX len 8 ver 0: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum none 0:0 compress incompressible ptr: 0:34:0 gen 0 stale bcachefs (loop0 inum 4099 offset 0): read error 3 from btree lookup --- 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 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