Bug 224262

Which kernel was this?

And without exact addresses and offsets for the call trace it's
kind of hard to tell what happened.

It is 2.6.19-1.2895.fc6 i686 kernel. That machine doesn't have a serial
port and kernel panic doesn't happen very time. I will try to write
down the addresses next time.

It happened again with "make check" in glibc.

BUG: spinlock lockup on CPU#0, ld-linux.so.2/7451, c0859f88 (Not tainted)
[<c0405018>] dump_trace+0x69/0x1b6
[<c040517d>] show_trace_log_lvl+0x18/0x2c
[<c0405778>] show_trace+0f/0x11
[<c0405875>] dump_stack+0x15/0x17
[<c04f39af>] _raw_spin_lock+0xbf/0xdc
[<c043f10c>] exit_pi_state_list+0x4a/0x130
[<c042a6b4>] do_exit+0x73b/0x787
[<c0405719>] die+0x2c3/0x2e8
[<c0405c5a>] do_invalid_op+0xa2/0xab
[<c0625ce1>] error_code+0x39/0x40
[<c043f3d7>] rt_mutex_next_owner+0x2f/0x40
[<c043ecfc>] do_futex+0x94d/0xbe3
[<c043f0af>] sys_futex+0x11d/0x130
[<c040404b>] syscall_call+0x7/0xb
[<40000402>] 0x4000402

We are trying to recursively take hb->lock:
    taken at kernel/futex.c:futex_unlock_pi():1384

So the BUG_ON() message never even gets delivered.

[<c04f39af>] _raw_spin_lock+0xbf/0xdc
[<c043f10c>] exit_pi_state_list+0x4a/0x130
    kernel/futex.c:exit_pi_state_list():437:
        spin_lock(&hb->lock);
[<c042a6b4>] do_exit+0x73b/0x787
[<c0405719>] die+0x2c3/0x2e8
[<c0405c5a>] do_invalid_op+0xa2/0xab
[<c0625ce1>] error_code+0x39/0x40
[<c043f3d7>] rt_mutex_next_owner+0x2f/0x40
    kernel/rt_mutex_common.c:rt_mutex_top_waiter():74:
        BUG_ON(w->lock != lock);
[<c043ecfc>] do_futex+0x94d/0xbe3
     inlined: futex_unlock_pi()
     inlined: wake_futex_pi()
     kernel/futex.c:wake_futex_pi():569:
        new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
[<c043f0af>] sys_futex+0x11d/0x130
[<c040404b>] syscall_call+0x7/0xb

This should be fixed in kernel 2.6.20-1.2933.fc6, available in fedora-testing.

Can you test this?

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