Ingo Molnar wrote: > * Michal Piotrowski <[EMAIL PROTECTED]> wrote: > >> Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms: >> - X hangs (keyboard, mouse, sound etc.) >> - only Magic SysRq works > > please try the patch below! I think we have nailed this bug. > > Ingo > > Index: linux/kernel/sched.c > =================================================================== > --- linux.orig/kernel/sched.c > +++ linux/kernel/sched.c > @@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void) > BUG_ON(!in_softirq()); > > if (need_resched() && system_state == SYSTEM_RUNNING) { > - raw_local_irq_disable(); > - _local_bh_enable(); > - raw_local_irq_enable(); > + local_bh_enable(); > __cond_resched(); > local_bh_disable(); > return 1;
We may have a problem with that: BUG: warning at kernel/softirq.c:138/local_bh_enable() (Not tainted) [<c042b2ef>] local_bh_enable+0x45/0x92 [<c06036b7>] cond_resched_softirq+0x2c/0x42 [<c059d5d0>] release_sock+0x54/0xa3 [<c05c9428>] tcp_sendmsg+0x91b/0xa0c [<c05e1bb9>] inet_sendmsg+0x3b/0x45 [<c059af34>] sock_aio_write+0xf9/0x105 [<c0476035>] do_sync_write+0xc7/0x10a [<c0437265>] autoremove_wake_function+0x0/0x35 [<c047688e>] vfs_write+0xbc/0x154 [<c0476e8c>] sys_write+0x41/0x67 [<c0404f70>] syscall_call+0x7/0xb That's: WARN_ON_ONCE(irqs_disabled()); And another, tainted but probably valid: BUG: warning at kernel/softirq.c:138/local_bh_enable() (Tainted: P ) [<c042b2ef>] local_bh_enable+0x45/0x92 [<c06036b7>] cond_resched_softirq+0x2c/0x42 [<c059d5d0>] release_sock+0x54/0xa3 [<c05c9428>] tcp_sendmsg+0x91b/0xa0c [<c04e8b30>] copy_to_user+0x3c/0x50 [<c05a1b71>] memcpy_toiovec+0x27/0x4a [<c059d58f>] release_sock+0x13/0xa3 [<c0604ad5>] _spin_unlock_bh+0x5/0xd [<c05e1bb9>] inet_sendmsg+0x3b/0x45 [<c059af34>] sock_aio_write+0xf9/0x105 [<c0475f31>] do_sync_readv_writev+0xc1/0xfe [<c0437265>] autoremove_wake_function+0x0/0x35 [<c04e88e0>] copy_from_user+0x3a/0x66 [<c0475dec>] rw_copy_check_uvector+0x5c/0xb0 [<c047667a>] do_readv_writev+0xbc/0x187 [<c059ae3b>] sock_aio_write+0x0/0x105 [<c0476782>] vfs_writev+0x3d/0x48 [<c0476bee>] sys_writev+0x41/0x95 [<c0404f70>] syscall_call+0x7/0xb https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240982 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/