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    Subject[syzbot] INFO: task hung in blkdev_get_by_dev (2)
    From
    Hello,

    syzbot found the following issue on:

    HEAD commit: ee1703cda8dc Merge tag 'hyperv-fixes-signed-20211117' of g..
    git tree: upstream
    console output: https://syzkaller.appspot.com/x/log.txt?x=106a11c9b00000
    kernel config: https://syzkaller.appspot.com/x/.config?x=b7264d1cb8ba2795
    dashboard link: https://syzkaller.appspot.com/bug?extid=8325c16da4174fb30a26
    compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

    Unfortunately, I don't have any reproducer for this issue yet.

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+8325c16da4174fb30a26@syzkaller.appspotmail.com

    INFO: task syz-executor.3:6555 blocked for more than 143 seconds.
    Not tainted 5.16.0-rc1-syzkaller #0
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    task:syz-executor.3 state:D stack:23840 pid: 6555 ppid: 1 flags:0x00000004
    Call Trace:
    <TASK>
    context_switch kernel/sched/core.c:4972 [inline]
    __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
    schedule+0xd2/0x260 kernel/sched/core.c:6326
    schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
    __mutex_lock_common kernel/locking/mutex.c:680 [inline]
    __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
    blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
    blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
    blkdev_open+0x154/0x2e0 block/fops.c:501
    do_dentry_open+0x4c8/0x1250 fs/open.c:822
    do_open fs/namei.c:3426 [inline]
    path_openat+0x1cad/0x2750 fs/namei.c:3559
    do_filp_open+0x1aa/0x400 fs/namei.c:3586
    do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
    do_sys_open fs/open.c:1228 [inline]
    __do_sys_openat fs/open.c:1244 [inline]
    __se_sys_openat fs/open.c:1239 [inline]
    __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239
    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: 0033:0x7f3e2302ba04
    RSP: 002b:00007fffeddde3e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
    RAX: ffffffffffffffda RBX: 00007fffeddde4e0 RCX: 00007f3e2302ba04
    RDX: 0000000000000002 RSI: 00007fffeddde520 RDI: 00000000ffffff9c
    RBP: 00007fffeddde520 R08: 0000000000000000 R09: 00007fffeddde2f0
    R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
    R13: 0000000000000000 R14: 0000000000000009 R15: 00007fffeddde520
    </TASK>
    INFO: task systemd-udevd:9608 blocked for more than 143 seconds.
    Not tainted 5.16.0-rc1-syzkaller #0
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    task:systemd-udevd state:D stack:26040 pid: 9608 ppid: 2974 flags:0x00000000
    Call Trace:
    <TASK>
    context_switch kernel/sched/core.c:4972 [inline]
    __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
    schedule+0xd2/0x260 kernel/sched/core.c:6326
    blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
    __loop_clr_fd+0x1ae/0x1070 drivers/block/loop.c:1122
    lo_release+0x1ac/0x1f0 drivers/block/loop.c:1761
    blkdev_put_whole block/bdev.c:694 [inline]
    blkdev_put+0x2fb/0x9e0 block/bdev.c:956
    blkdev_close+0x6a/0x80 block/fops.c:515
    __fput+0x286/0x9f0 fs/file_table.c:280
    task_work_run+0xdd/0x1a0 kernel/task_work.c:164
    tracehook_notify_resume include/linux/tracehook.h:189 [inline]
    exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
    exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
    __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
    syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
    do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
    entry_SYSCALL_64_after_hwframe+0x44/0xae
    RIP: 0033:0x7f8febedd270
    RSP: 002b:00007fff5ede1b08 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
    RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f8febedd270
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
    RBP: 00007f8fecd97710 R08: 000055f7f8a17e60 R09: 000055f7f8a17c00
    R10: 00007f8fecd978c0 R11: 0000000000000246 R12: 0000000000000000
    R13: 000055f7f8a17810 R14: 0000000000000003 R15: 000000000000000e
    </TASK>

    Showing all locks held in the system:
    1 lock held by khungtaskd/26:
    #0: ffffffff8bb80f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
    1 lock held by in:imklog/6441:
    #0: ffff88806e510bb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
    4 locks held by rs:main Q:Reg/6442:
    #0: ffff8880b9d39b18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
    #1: ffff8880b9d279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880
    #2: ffff88806b33d670 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:783 [inline]
    #2: ffff88806b33d670 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x3b0 fs/ext4/file.c:263
    #3: ffff88806b33d9d0 (&ei->i_raw_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
    #3: ffff88806b33d9d0 (&ei->i_raw_lock){+.+.}-{2:2}, at: ext4_do_update_inode fs/ext4/inode.c:5077 [inline]
    #3: ffff88806b33d9d0 (&ei->i_raw_lock){+.+.}-{2:2}, at: ext4_mark_iloc_dirty+0x207/0x1cf0 fs/ext4/inode.c:5694
    1 lock held by syz-executor.3/6555:
    #0: ffff88801af71118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
    2 locks held by systemd-udevd/9608:
    #0: ffff88801af71118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
    #1: ffff88801af39b60 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0x7a/0x1070 drivers/block/loop.c:1106

    =============================================

    NMI backtrace for cpu 0
    CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    Call Trace:
    <TASK>
    __dump_stack lib/dump_stack.c:88 [inline]
    dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
    nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
    nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
    trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
    check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
    watchdog+0xc1d/0xf50 kernel/hung_task.c:295
    kthread+0x405/0x4f0 kernel/kthread.c:327
    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
    </TASK>
    Sending NMI from CPU 0 to CPUs 1:
    NMI backtrace for cpu 1
    CPU: 1 PID: 2961 Comm: systemd-journal Not tainted 5.16.0-rc1-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    RIP: 0010:__lock_acquire+0x3bd/0x54a0 kernel/locking/lockdep.c:4975
    Code: 00 00 fc ff df 45 89 7c 24 20 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 84 11 00 00 8b 84 24 38 01 00 00 <41> 89 44 24 24 48 8b 6c 24 10 be 08 00 00 00 81 e5 ff 1f 00 00 48
    RSP: 0018:ffffc90001a678f8 EFLAGS: 00000046
    RAX: 0000000000000000 RBX: ffff8880b9d35620 RCX: 0000000000000000
    RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888014d80d04
    RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000001 R12: ffff888014d80ce0
    R13: ffff888014d80280 R14: 0000000000040000 R15: 00000000000c0021
    FS: 00007f103cfef8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007f103a5ec000 CR3: 000000007795a000 CR4: 00000000003506e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    <TASK>
    lock_acquire kernel/locking/lockdep.c:5637 [inline]
    lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
    local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
    rmqueue_pcplist mm/page_alloc.c:3644 [inline]
    rmqueue mm/page_alloc.c:3682 [inline]
    get_page_from_freelist+0x4aa/0x2f50 mm/page_alloc.c:4146
    __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
    __alloc_pages_node include/linux/gfp.h:570 [inline]
    kmem_getpages mm/slab.c:1377 [inline]
    cache_grow_begin+0x75/0x470 mm/slab.c:2593
    cache_alloc_refill+0x27f/0x380 mm/slab.c:2965
    ____cache_alloc mm/slab.c:3048 [inline]
    ____cache_alloc mm/slab.c:3031 [inline]
    __do_cache_alloc mm/slab.c:3275 [inline]
    slab_alloc mm/slab.c:3316 [inline]
    kmem_cache_alloc+0x450/0x560 mm/slab.c:3507
    getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
    getname_flags include/linux/audit.h:323 [inline]
    getname fs/namei.c:217 [inline]
    __do_sys_mkdir fs/namei.c:3929 [inline]
    __se_sys_mkdir fs/namei.c:3927 [inline]
    __x64_sys_mkdir+0xda/0x140 fs/namei.c:3927
    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: 0033:0x7f103c2aa687
    Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48
    RSP: 002b:00007ffdc5cac1b8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053
    RAX: ffffffffffffffda RBX: 00007ffdc5caf220 RCX: 00007f103c2aa687
    RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005593d09db8c0
    RBP: 00007ffdc5cac1f0 R08: 00005593d00583e5 R09: 0000000000000018
    R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000
    R13: 0000000000000001 R14: 00005593d09db8c0 R15: 00007ffdc5cac830
    </TASK>
    ----------------
    Code disassembly (best guess), 4 bytes skipped:
    0: df 45 89 filds -0x77(%rbp)
    3: 7c 24 jl 0x29
    5: 20 0f and %cl,(%rdi)
    7: b6 14 mov $0x14,%dh
    9: 02 48 89 add -0x77(%rax),%cl
    c: f8 clc
    d: 83 e0 07 and $0x7,%eax
    10: 83 c0 03 add $0x3,%eax
    13: 38 d0 cmp %dl,%al
    15: 7c 08 jl 0x1f
    17: 84 d2 test %dl,%dl
    19: 0f 85 84 11 00 00 jne 0x11a3
    1f: 8b 84 24 38 01 00 00 mov 0x138(%rsp),%eax
    * 26: 41 89 44 24 24 mov %eax,0x24(%r12) <-- trapping instruction
    2b: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp
    30: be 08 00 00 00 mov $0x8,%esi
    35: 81 e5 ff 1f 00 00 and $0x1fff,%ebp
    3b: 48 rex.W


    ---
    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.

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