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    Subject[syzbot] BUG: sleeping function called from invalid context in _copy_to_iter
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    Hello,

    syzbot found the following issue on:

    HEAD commit: c2eecaa193ff pktgen: Remove redundant clone_skb override
    git tree: net-next
    console output: https://syzkaller.appspot.com/x/log.txt?x=12e3a69e300000
    kernel config: https://syzkaller.appspot.com/x/.config?x=aba0c23f8230e048
    dashboard link: https://syzkaller.appspot.com/bug?extid=8760ca6c1ee783ac4abd
    compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c5b104300000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10062aaa300000

    The issue was bisected to:

    commit 314001f0bf927015e459c9d387d62a231fe93af3
    Author: Rao Shoaib <rao.shoaib@oracle.com>
    Date: Sun Aug 1 07:57:07 2021 +0000

    af_unix: Add OOB support

    bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10765f8e300000
    final oops: https://syzkaller.appspot.com/x/report.txt?x=12765f8e300000
    console output: https://syzkaller.appspot.com/x/log.txt?x=14765f8e300000

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+8760ca6c1ee783ac4abd@syzkaller.appspotmail.com
    Fixes: 314001f0bf92 ("af_unix: Add OOB support")

    BUG: sleeping function called from invalid context at lib/iov_iter.c:619
    in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8443, name: syz-executor700
    2 locks held by syz-executor700/8443:
    #0: ffff888028fa0d00 (&u->iolock){+.+.}-{3:3}, at: unix_stream_read_generic+0x16c6/0x2190 net/unix/af_unix.c:2501
    #1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
    #1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: unix_stream_read_generic+0x16d0/0x2190 net/unix/af_unix.c:2502
    Preemption disabled at:
    [<0000000000000000>] 0x0
    CPU: 1 PID: 8443 Comm: syz-executor700 Not tainted 5.14.0-rc3-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    Call Trace:
    __dump_stack lib/dump_stack.c:88 [inline]
    dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
    ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9154
    __might_fault+0x6e/0x180 mm/memory.c:5258
    _copy_to_iter+0x199/0x1600 lib/iov_iter.c:619
    copy_to_iter include/linux/uio.h:139 [inline]
    simple_copy_to_iter+0x4c/0x70 net/core/datagram.c:519
    __skb_datagram_iter+0x10f/0x770 net/core/datagram.c:425
    skb_copy_datagram_iter+0x40/0x50 net/core/datagram.c:533
    skb_copy_datagram_msg include/linux/skbuff.h:3620 [inline]
    unix_stream_read_actor+0x78/0xc0 net/unix/af_unix.c:2701
    unix_stream_recv_urg net/unix/af_unix.c:2433 [inline]
    unix_stream_read_generic+0x17cd/0x2190 net/unix/af_unix.c:2504
    unix_stream_recvmsg+0xb1/0xf0 net/unix/af_unix.c:2717
    sock_recvmsg_nosec net/socket.c:944 [inline]
    sock_recvmsg net/socket.c:962 [inline]
    sock_recvmsg net/socket.c:958 [inline]
    ____sys_recvmsg+0x2c4/0x600 net/socket.c:2622
    ___sys_recvmsg+0x127/0x200 net/socket.c:2664
    do_recvmmsg+0x24d/0x6d0 net/socket.c:2758
    __sys_recvmmsg net/socket.c:2837 [inline]
    __do_sys_recvmmsg net/socket.c:2860 [inline]
    __se_sys_recvmmsg net/socket.c:2853 [inline]
    __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2853
    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: 0033:0x43ef39
    Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007ffca8776d68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
    RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef39
    RDX: 0000000000000700 RSI: 0000000020001140 RDI: 0000000000000004
    RBP: 0000000000402f20 R08: 0000000000000000 R09: 0000000000400488
    R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000402fb0
    R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488

    =============================
    [ BUG: Invalid wait context ]
    5.14.0-rc3-syzkaller #0 Tainted: G W
    -----------------------------
    syz-executor700/8443 is trying to lock:
    ffff8880212b6a28 (&mm->mmap_lock#2){++++}-{3:3}, at: __might_fault+0xa3/0x180 mm/memory.c:5260
    other info that might help us debug this:
    context-{4:4}
    2 locks held by syz-executor700/8443:
    #0: ffff888028fa0d00 (&u->iolock){+.+.}-{3:3}, at: unix_stream_read_generic+0x16c6/0x2190 net/unix/af_unix.c:2501
    #1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
    #1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: unix_stream_read_generic+0x16d0/0x2190 net/unix/af_unix.c:2502
    stack backtrace:
    CPU: 1 PID: 8443 Comm: syz-executor700 Tainted: G W 5.14.0-rc3-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    Call Trace:
    __dump_stack lib/dump_stack.c:88 [inline]
    dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
    print_lock_invalid_wait_context kernel/locking/lockdep.c:4666 [inline]
    check_wait_context kernel/locking/lockdep.c:4727 [inline]
    __lock_acquire.cold+0x213/0x3ab kernel/locking/lockdep.c:4965
    lock_acquire kernel/locking/lockdep.c:5625 [inline]
    lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
    __might_fault mm/memory.c:5261 [inline]
    __might_fault+0x106/0x180 mm/memory.c:5246
    _copy_to_iter+0x199/0x1600 lib/iov_iter.c:619
    copy_to_iter include/linux/uio.h:139 [inline]
    simple_copy_to_iter+0x4c/0x70 net/core/datagram.c:519
    __skb_datagram_iter+0x10f/0x770 net/core/datagram.c:425
    skb_copy_datagram_iter+0x40/0x50 net/core/datagram.c:533
    skb_copy_datagram_msg include/linux/skbuff.h:3620 [inline]
    unix_stream_read_actor+0x78/0xc0 net/unix/af_unix.c:2701
    unix_stream_recv_urg net/unix/af_unix.c:2433 [inline]
    unix_stream_read_generic+0x17cd/0x2190 net/unix/af_unix.c:2504
    unix_stream_recvmsg+0xb1/0xf0 net/unix/af_unix.c:2717
    sock_recvmsg_nosec net/socket.c:944 [inline]
    sock_recvmsg net/socket.c:962 [inline]
    sock_recvmsg net/socket.c:958 [inline]
    ____sys_recvmsg+0x2c4/0x600 net/socket.c:2622
    ___sys_recvmsg+0x127/0x200 net/socket.c:2664
    do_recvmmsg+0x24d/0x6d0 net/socket.c:2758
    __sys_recvmmsg net/socket.c:2837 [inline]
    __do_sys_recvmmsg net/socket.c:2860 [inline]
    __se_sys_recvmmsg net/socket.c:2853 [inline]
    __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2853
    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: 0033:0x43ef39
    Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007ffca8776d68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
    RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef39
    RDX: 0000000000000700 RSI: 0000000020001140 RDI: 0000000000000004
    RBP: 0000000000402f20 R08: 0000000000000000 R09: 0000000000400488
    R10: 0000000000000007 R11: 0000000000000246 R12: 0000


    ---
    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.
    For information about bisection process see: https://goo.gl/tpsmEJ#bisection
    syzbot can test patches for this issue, for details see:
    https://goo.gl/tpsmEJ#testing-patches

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