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    SubjectRe: [PATCH] sched/deadline: Initialize dl_boosted
    Hi Juri,

    On Wed, Jun 17, 2020 at 09:29:19AM +0200, Juri Lelli wrote:
    > This happens because dl_boosted flag is currently not initialized by
    > __dl_clear_params() (unlike the other flags) and setup_new_dl_entity()
    > finds complains about it.
    >
    > Initialize dl_boosted to 0.
    >
    > Reported-by: syzbot+5ac8bac25f95e8b221e7@syzkaller.appspotmail.com
    > Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
    > Tested-by: Daniel Wagner <dwagner@suse.de>

    Well, as it turns I can't trigger a warning on mainline but pretty simple on
    RT (5.6.14-rt7-rt):

    invalid opcode: 0000 [#1] PREEMPT_RT SMP NOPTI
    CPU: 1 PID: 317 Comm: 0d19f76ecda7c30 Not tainted 5.6.14-rt7-rt #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
    RIP: 0010:enqueue_task_dl+0x71/0x3b0
    Code: 74 28 41 83 fc 20 75 22 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 4c 8d a8 b8 02 00 00 f6 c2 02 75 0c 8b 45 74 85 c0 78 2
    RSP: 0018:ffffc90000673ba8 EFLAGS: 00010002

    RAX: ffff88807e87a700 RBX: 00000000ffffffff RCX: 0000000000000078
    RDX: 0000000000000002 RSI: 0000000000000078 RDI: ffff88807c52bb80
    RBP: ffff88800feda700 R08: ffff88807e87a700 R09: ffffffff81e43ea0
    R10: 0000000000000000 R11: 000000000000006d R12: 000000000000002e
    R13: 0000000000000078 R14: ffff88807c52bb80 R15: ffff88800feda9b8
    FS: 000000000175c880(0000) GS:ffff88807c500000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007fff9cbfa000 CR3: 000000007c4b2000 CR4: 00000000000006e0
    Call Trace:
    ? dequeue_task_fair+0x67/0x2b0
    rt_mutex_setprio+0x39f/0x510
    ? __switch_to_asm+0x34/0x70
    task_blocks_on_rt_mutex+0x2a4/0x390
    ? __switch_to_asm+0x40/0x70
    ? __switch_to_asm+0x34/0x70
    rt_spin_lock_slowlock_locked+0xb2/0x2c0
    ? _raw_spin_unlock_irq+0x1d/0x50
    ? finish_task_switch+0xa0/0x2e0
    rt_spin_lock_slowlock+0x51/0x80
    __local_bh_disable_ip+0x7f/0xa0
    hrtimer_cancel_wait_running+0x31/0x70
    hrtimer_cancel+0x1f/0x30
    futex_wait+0x1e9/0x240
    ? __hrtimer_init+0xe0/0xe0
    do_futex+0x10a/0x1d0
    __x64_sys_futex+0x134/0x162
    do_syscall_64+0x69/0x110
    entry_SYSCALL_64_after_hwframe+0x44/0xa9
    RIP: 0033:0x445b89
    Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 8
    RSP: 002b:00007fff9cbe2498 EFLAGS: 00000206
    ORIG_RAX: 00000000000000ca
    RAX: ffffffffffffffda RBX: 00000000004004e8 RCX: 0000000000445b89
    RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004ca3ec
    RBP: 00007fff9cbe24e0 R08: 0000000000003fdc R09: 000000000000002d
    R10: 00007fff9cbe24b0 R11: 0000000000000206 R12: 0000000000408bb0
    R13: 0000000000000000 R14: 00000000004c8018 R15: 00000000004004e8
    Modules linked in:

    This looks similar to the one reported here:

    [PATCH 0/2] Fix SCHED_DEADLINE nested priority inheritance
    https://lore.kernel.org/lkml/20191112075056.19971-1-juri.lelli@redhat.com/

    Thanks,
    Daniel

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