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    SubjectRe: [PATCH bpf-next v2] selftests/bpf: fix incorrect fcntl call (test_sockmap.c)
    On Wed, Aug 24, 2022 at 7:11 PM Qiao Ma <mqaio@linux.alibaba.com> wrote:
    >
    > In test_sockmap.c, the testcase sets socket nonblock first, and then
    > calls select() and recvmsg() to receive data.
    > If some error occur, nonblock setting will make recvmsg() return
    > immediately, rather than blocking forever.
    >
    > However, the way to call fcntl() to set nonblock is wrong.
    > To set socket noblock, we need to use
    > > fcntl(fd, F_SETFL, O_NONBLOCK);
    > rather than:
    > > fcntl(fd, O_NONBLOCK);
    >
    > Signed-off-by: Qiao Ma <mqaio@linux.alibaba.com>
    > ---
    > tools/testing/selftests/bpf/test_sockmap.c | 7 ++++++-
    > 1 file changed, 6 insertions(+), 1 deletion(-)
    >
    > diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
    > index 0fbaccdc8861..abb4102f33b0 100644
    > --- a/tools/testing/selftests/bpf/test_sockmap.c
    > +++ b/tools/testing/selftests/bpf/test_sockmap.c
    > @@ -598,7 +598,12 @@ static int msg_loop(int fd, int iov_count, int iov_length, int cnt,
    > struct timeval timeout;
    > fd_set w;
    >
    > - fcntl(fd, fd_flags);
    > + err = fcntl(fd, F_SETFL, fd_flags);
    > + if (err < 0) {
    > + perror("fcntl failed");
    > + goto out_errno;
    > + }
    > +

    John, Jakub,

    Please review this.
    Unfortunately test_sockmap (and sockmap kernel) is broken
    before and after this patch,
    so I'm hesitant to apply it not to make thing harder to debug.
    Here is what I see:
    # ./test_sockmap
    recv failed(): Bad address
    rx thread exited with err 1.
    recv failed(): Bad address
    rx thread exited with err 1.
    recv failed(): Bad address
    rx thread exited with err 1.
    # 4/ 6 sockmap::txmsg test ingress redirect:FAIL
    detected skb data error with skb ingress update @iov[0]:0 "00 00 00
    00" != "PASS"
    data verify msg failed: Unknown error -5
    rx thread exited with err 1.
    [ 16.735850] ------------[ cut here ]------------
    [ 16.736195] WARNING: CPU: 3 PID: 1480 at net/core/stream.c:205
    sk_stream_kill_queues+0x18a/0x1a0
    [ 16.736799] Modules linked in:
    [ 16.737007] CPU: 3 PID: 1480 Comm: test_sockmap Not tainted
    5.19.0-14050-g343949e10798 #4212
    [ 16.737543] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
    BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
    [ 16.738522] RIP: 0010:sk_stream_kill_queues+0x18a/0x1a0
    [ 16.738883] Code: 41 5f c3 89 ee 48 89 df e8 13 69 fe ff 4c 89 e7
    e8 db 01 4f ff 8b ab 28 02 00 00 eb c1 0f 0b e9 62 ff ff ff 0f 0b 85
    ed 74 ce <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 0f 1f 84 00 00 00
    00 00
    [ 16.740082] RSP: 0018:ffff888118007ab8 EFLAGS: 00010206
    [ 16.740435] RAX: 0000000000000000 RBX: ffff8881174b2400 RCX: ffffffff81f5d47a
    [ 16.740915] RDX: 0000000000000003 RSI: dffffc0000000000 RDI: ffff8881174b2670
    [ 16.741374] RBP: 0000000000000b00 R08: fffffbfff08cfbdf R09: fffffbfff08cfbdf
    [ 16.741841] R10: ffffffff8467def7 R11: fffffbfff08cfbde R12: ffff8881174b2628
    [ 16.742298] R13: ffffffff85c13c00 R14: ffff88810611d824 R15: ffff8881174b25c8
    [ 16.742768] FS: 00007f937403c400(0000) GS:ffff888628f80000(0000)
    knlGS:0000000000000000
    [ 16.743283] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 16.743657] CR2: 00007f937403c378 CR3: 0000000125983005 CR4: 00000000003706e0
    [ 16.744124] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 16.744584] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [ 16.745065] Call Trace:
    [ 16.745241] <TASK>
    [ 16.745401] inet_csk_destroy_sock+0x9f/0x1c0
    [ 16.745707] tcp_rcv_state_process+0x1a84/0x2120
    [ 16.746013] ? lock_release+0x3b0/0x3b0
    [ 16.746271] ? tcp_established_options+0x189/0x300
    [ 16.746592] ? tcp_finish_connect+0x240/0x240
    [ 16.746894] ? rcu_read_lock_bh_held+0xa0/0xa0
    [ 16.747190] ? rcu_read_lock_held_common+0x1a/0x50
    [ 16.747505] ? rcu_read_lock_sched_held+0x56/0xc0
    [ 16.747823] ? rcu_read_lock_held_common+0x1a/0x50
    [ 16.748139] ? lock_release+0xad/0x3b0
    [ 16.748390] ? __release_sock+0x83/0x150
    [ 16.748646] ? lock_downgrade+0x360/0x360
    [ 16.748932] ? lock_acquire+0xab/0x380
    [ 16.749187] ? lock_downgrade+0x360/0x360
    [ 16.749440] ? tcp_v4_do_rcv+0x195/0x4f0
    [ 16.749696] tcp_v4_do_rcv+0x195/0x4f0
    [ 16.749933] ? trace_hardirqs_on+0x2d/0xe0
    [ 16.750194] __release_sock+0xb9/0x150
    ...
    [ 213.529908] ------------[ cut here ]------------
    [ 213.530232] page_counter underflow: -7 nr_pages=31
    [ 213.530571] WARNING: CPU: 1 PID: 1925 at mm/page_counter.c:57
    page_counter_cancel+0x56/0x80
    [ 213.531125] Modules linked in:
    [ 213.531332] CPU: 1 PID: 1925 Comm: test_sockmap Tainted: G W
    5.19.0-14050-g343949e10798 #4212
    [ 213.531989] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
    BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
    [ 213.532734] RIP: 0010:page_counter_cancel+0x56/0x80
    [ 213.533070] Code: 0a 48 89 df 5b 5d e9 89 fe ff ff 80 3d d1 b6 1e
    03 00 75 18 48 89 ea 48 c7 c7 60 6a b3 82 c6 05 be b6 1e 03 01 e8 aa
    aa 0b 01 <0f> 0b be 08 00 00 00 48 89 df e8 bb 22 fe ff 48 89 df e8 13
    1a fe
    [ 213.534259] RSP: 0018:ffff88811ae2f8b0 EFLAGS: 00010086
    [ 213.534607] RAX: 0000000000000000 RBX: ffff888100c08120 RCX: 0000000000000000
    [ 213.535071] RDX: 0000000000000027 RSI: dffffc0000000000 RDI: ffffed10235c5f0c
    [ 213.535535] RBP: 000000000000001f R08: ffffed10c51d4ee6 R09: ffffed10c51d4ee6
    [ 213.536000] R10: ffff888628ea772b R11: ffffed10c51d4ee5 R12: ffff888628eb5d18
    [ 213.536479] R13: ffff888628eb5d10 R14: ffff888628eb5d18 R15: 000000000000001f
    [ 213.536953] FS: 00007fe0f0478400(0000) GS:ffff888628e80000(0000)
    knlGS:0000000000000000
    [ 213.537463] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 213.537858] CR2: 00007fe0f04786d0 CR3: 000000011ab33004 CR4: 00000000003706e0
    [ 213.538325] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 213.538838] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [ 213.539318] Call Trace:
    [ 213.539488] <TASK>
    [ 213.539635] page_counter_uncharge+0x1d/0x40
    [ 213.539927] drain_stock.isra.54+0x5d/0xb0
    [ 213.540200] __refill_stock+0x42/0xb0
    [ 213.540451] refill_stock+0xc1/0x1c0
    [ 213.540688] try_charge_memcg+0xb2e/0xb50

    and test_sockmap 'hangs' (or doing something for long time) after
    #31/ 6 sockhash:ktls:txmsg test drop:OK

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