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    SubjectUBSAN: shift-out-of-bounds in load_balance
    From
    Hello,

    syzbot found the following issue on:

    HEAD commit: bc085f8f Add linux-next specific files for 20210121
    git tree: linux-next
    console output: https://syzkaller.appspot.com/x/log.txt?x=10b71a2cd00000
    kernel config: https://syzkaller.appspot.com/x/.config?x=1224bbf217b0bec8
    dashboard link: https://syzkaller.appspot.com/bug?extid=d7581744d5fd27c9fbe1
    compiler: gcc (GCC) 10.1.0-syz 20200507

    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+d7581744d5fd27c9fbe1@syzkaller.appspotmail.com

    ================================================================================
    UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7741:14
    shift exponent 86 is too large for 64-bit type 'long unsigned int'
    CPU: 1 PID: 13261 Comm: kworker/u4:13 Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    Workqueue: krdsd rds_tcp_accept_worker
    Call Trace:
    <IRQ>
    __dump_stack lib/dump_stack.c:79 [inline]
    dump_stack+0x107/0x163 lib/dump_stack.c:120
    ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
    __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
    detach_tasks kernel/sched/fair.c:7741 [inline]
    load_balance.cold+0x1d/0x2e kernel/sched/fair.c:9670
    rebalance_domains+0x5cc/0xdb0 kernel/sched/fair.c:10058
    __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
    asm_call_irq_on_stack+0xf/0x20
    </IRQ>
    __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
    run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
    do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
    do_softirq kernel/softirq.c:246 [inline]
    do_softirq+0xb5/0xe0 kernel/softirq.c:233
    __local_bh_enable_ip+0xf4/0x110 kernel/softirq.c:196
    local_bh_enable include/linux/bottom_half.h:32 [inline]
    rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline]
    ip_finish_output2+0x88b/0x21b0 net/ipv4/ip_output.c:231
    __ip_finish_output net/ipv4/ip_output.c:308 [inline]
    __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290
    ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318
    NF_HOOK_COND include/linux/netfilter.h:290 [inline]
    ip_output+0x196/0x310 net/ipv4/ip_output.c:432
    dst_output include/net/dst.h:441 [inline]
    ip_local_out net/ipv4/ip_output.c:126 [inline]
    __ip_queue_xmit+0x8e9/0x1a00 net/ipv4/ip_output.c:532
    __tcp_transmit_skb+0x188c/0x38f0 net/ipv4/tcp_output.c:1405
    tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline]
    tcp_write_xmit+0xde7/0x6140 net/ipv4/tcp_output.c:2689
    __tcp_push_pending_frames+0xaa/0x390 net/ipv4/tcp_output.c:2869
    tcp_send_fin+0x117/0xbb0 net/ipv4/tcp_output.c:3426
    tcp_shutdown net/ipv4/tcp.c:2636 [inline]
    tcp_shutdown+0x127/0x170 net/ipv4/tcp.c:2621
    inet_shutdown+0x1a8/0x430 net/ipv4/af_inet.c:890
    rds_tcp_accept_one+0x5e0/0xc10 net/rds/tcp_listen.c:214
    rds_tcp_accept_worker+0x50/0x80 net/rds/tcp.c:515
    process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
    worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
    kthread+0x3b1/0x4a0 kernel/kthread.c:292
    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
    ================================================================================


    ---
    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:
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