From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 7EEA2E55C for ; Sat, 24 Jan 2026 13:10:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769260234; cv=none; b=VtrgcAgzO9KH1dGCDl5tnBTREEMB0P54U4Z5ntzLFtQ7aRvQMLkyk5sCBeWSfF2Xg7suEAKRKBK+Dk+c5RKki6jsl9zPBETvFqnBMfjYMQUlSz112CcW0Ga2IC4yQC8l/zZb7/WCzidvy49+8UBCeR4/TQP+SuNjrud24GiKfHU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769260234; c=relaxed/simple; bh=7RTkZ474UUJD+ra2YETzVu0cNSTzU1/InW4Sh1qhHmA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=PLba3ihBvKulFfBPVtg1oVIMdFA4/VYdlyj0luTTdcCAkf9elGJgzlHZesNhYfP79iBpC0zLfEDBkrTLrwRU59mrLd0d7aGdljVsBwTVUHfFuVlfBYbMcanVfOm3kFToleu9w4zzOe281TUFlRLUqHSuJAfU2e3weVehPo8IhA4= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-662c9283415so7402982eaf.1 for ; Sat, 24 Jan 2026 05:10:32 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769260231; x=1769865031; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=XNSu4w3Lz6YTuBjgjK93YawmOK5beBEdSh0ZnfnLRS0=; b=QmhvrinR2tMEeX7OjJSebORCxEmaSBp2+HT7ttN5Vwk9zh9qoMiksFsLxnp1vOcDQZ dM3Y3suDsRQCj88Faai0OJNG0memldZsIhr+8kQOf83iD+Kxq22ND3sglDHhtFt3cBt0 l2PgMeyI/OQDSRK6Lv9q/ZCcaN0NDsKkZoEDooDHQ6qZvX0DDaX6E3QH6LMBD9kizOLx 6lM8H2/T5Yfp9EyK1VSWuUT0nz9v12uGodIC8GBXfcY70KYVqwT4CWYszfbfGmyTAyxO cejvBD5RNZL1nOUfMLUY9P0LnqbsIWHKPE/Zl0Jl+LPEsxA6qy5D2X1ZK1nxz4l3c3cx 6RQA== X-Forwarded-Encrypted: i=1; AJvYcCXnSTyAIOfRnFoqPyEmMlFVGU0XN2/gm30LN9KTRw/Hdu9NTXdMhPp1kkXPbh9s4PUn/Jnlza5HCkJx+A==@vger.kernel.org X-Gm-Message-State: AOJu0Yy6FxBIv7J0NF9gN7ryrCbHXfek5DgCVZjcRuIsCzMIKbsDBfpy ZZ6xdjCgw0B3fmv37Lx9jgJFzFgLKFe1F/I5WC6X0tR9qa7GAxUDvs6m/Kiw0IcQB5oeu0TY2+5 CPdwvkySDR3x+lsVwgcRBr5yExYwXrn7HLmbgxoWm937kIB6QAdzYuwMcdC4= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:22a6:b0:65d:22b:415a with SMTP id 006d021491bc7-662cab7e8e8mr3128180eaf.66.1769260231458; Sat, 24 Jan 2026 05:10:31 -0800 (PST) Date: Sat, 24 Jan 2026 05:10:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6974c4c7.a00a0220.33ccc7.000a.GAE@google.com> Subject: [syzbot] [block?] INFO: task hung in read_cache_folio (5) From: syzbot To: axboe@kernel.dk, linux-block@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: 24d479d26b25 Linux 6.19-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1248cd22580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9ec857cfb59de463 dashboard link: https://syzkaller.appspot.com/bug?extid=90f65e574fb85432db68 compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-24d479d2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f4a697aeae5b/vmlinux-24d479d2.xz kernel image: https://storage.googleapis.com/syzbot-assets/df285e089d77/zImage-24d479d2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90f65e574fb85432db68@syzkaller.appspotmail.com INFO: task udevd:6058 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:6058 tgid:6058 ppid:3136 task_flags:0x400140 flags:0x00000019 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5260 [inline] __schedule+0xcfc/0x2fec kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6964 io_schedule+0xac/0x114 kernel/sched/core.c:7791 folio_wait_bit_common+0x2a4/0x630 mm/filemap.c:1323 folio_put_wait_locked mm/filemap.c:1487 [inline] do_read_cache_folio+0x240/0x3f4 mm/filemap.c:4078 read_cache_folio+0x44/0x6c mm/filemap.c:4128 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xac/0x5f4 block/partitions/core.c:722 msdos_partition+0xe4/0x1f3c block/partitions/msdos.c:592 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x504/0xf08 block/partitions/core.c:693 blkdev_get_whole+0x144/0x1e4 block/bdev.c:765 bdev_open+0x1dc/0xa84 block/bdev.c:974 blkdev_open+0x270/0x3dc block/fops.c:698 do_dentry_open+0x3f4/0x10e4 fs/open.c:962 vfs_open+0x5c/0x2fc fs/open.c:1094 do_open fs/namei.c:4637 [inline] path_openat+0x17f0/0x28cc fs/namei.c:4796 do_filp_open+0x184/0x360 fs/namei.c:4823 do_sys_openat2+0xe0/0x188 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __arm64_sys_openat+0x12c/0x1bc fs/open.c:1447 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x2b0 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff800087552ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 4 locks held by kworker/1:2/912: #0: ffff00000dc29948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff80008ec17c90 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: psi_task_switch+0x60/0x804 kernel/sched/psi.c:933 #2: ffff00000fb4e160 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:340 [inline] #2: ffff00000fb4e160 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_damage_work+0x188/0x5d8 drivers/gpu/drm/drm_fb_helper.c:372 #3: ffff00001489a128 (&dev->master_mutex){+.+.}-{4:4}, at: drm_master_internal_acquire+0x24/0x6c drivers/gpu/drm/drm_auth.c:435 1 lock held by syslogd/3121: 2 locks held by getty/3259: #0: ffff00001373d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8eb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/3321: 2 locks held by kworker/u8:10/4327: #0: ffff00000dc31148 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff80008f437c90 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 2 locks held by kworker/u8:11/4332: #0: ffff00000dc31148 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff80008f417c90 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 1 lock held by udevd/6058: #0: ffff000015305358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 2 locks held by kworker/u8:1/6356: #0: ffff00000dc31148 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff8000a1f27c90 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 1 lock held by syz.0.1250/7258: #0: ffff000015305358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x84/0xa84 block/bdev.c:962 3 locks held by modprobe/7800: 2 locks held by modprobe/7802: 2 locks held by kworker/u8:11/7804: ============================================= INFO: task udevd:6058 blocked for more than 451 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:6058 tgid:6058 ppid:3136 task_flags:0x400140 flags:0x00000019 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5260 [inline] __schedule+0xcfc/0x2fec kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6964 io_schedule+0xac/0x114 kernel/sched/core.c:7791 folio_wait_bit_common+0x2a4/0x630 mm/filemap.c:1323 folio_put_wait_locked mm/filemap.c:1487 [inline] do_read_cache_folio+0x240/0x3f4 mm/filemap.c:4078 read_cache_folio+0x44/0x6c mm/filemap.c:4128 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xac/0x5f4 block/partitions/core.c:722 msdos_partition+0xe4/0x1f3c block/partitions/msdos.c:592 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x504/0xf08 block/partitions/core.c:693 blkdev_get_whole+0x144/0x1e4 block/bdev.c:765 bdev_open+0x1dc/0xa84 block/bdev.c:974 blkdev_open+0x270/0x3dc block/fops.c:698 do_dentry_open+0x3f4/0x10e4 fs/open.c:962 vfs_open+0x5c/0x2fc fs/open.c:1094 do_open fs/namei.c:4637 [inline] path_openat+0x17f0/0x28cc fs/namei.c:4796 do_filp_open+0x184/0x360 fs/namei.c:4823 do_sys_openat2+0xe0/0x188 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __arm64_sys_openat+0x12c/0x1bc fs/open.c:1447 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x2b0 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by rcu_preempt/15: 1 lock held by khungtaskd/32: #0: ffff800087552ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by syslogd/3121: 2 locks held by dhcpcd/3165: #0: ffff800088b7e8a8 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x418/0x5d4 net/socket.c:1337 #1: ffff800088ba83c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x1c/0x28 net/core/rtnetlink.c:80 2 locks held by getty/3259: #0: ffff00001373d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8eb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 5 locks held by kworker/u8:11/4332: #0: ffff00000e16b948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff80008f417c90 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 #2: ffff800088b93230 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xdc/0x75c net/core/net_namespace.c:670 #3: ffff800088ba83c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x1c/0x28 net/core/rtnetlink.c:80 #4: ffff80008755b5f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x250/0x364 kernel/rcu/tree_exp.h:311 3 locks held by kworker/u8:0/5452: 1 lock held by udevd/6058: #0: ffff000015305358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz.0.1250/7258: #0: ffff000015305358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x84/0xa84 block/bdev.c:962 3 locks held by kworker/u8:6/7811: #0: ffff00000dc31948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff80008e307c90 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 #2: ffff800088ba83c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x1c/0x28 net/core/rtnetlink.c:80 ============================================= --- 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