From: Alexander Nyberg When running a Posix conformance test (from posixtestsuite), the kernel locks up with: BUG: soft lockup detected on CPU#0 Pid: 1873, comm: 10-1.test EIP: 0060:[] CPU: 0 EIP is at sys_timer_settime+0xfa+0x1f0 EFLAGS: 00000282 Not tainted (2.6.11-rc3-mm2) EAX: 00000282 EBX: 00000001 ECX: ffffffff EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: f17eafbc DS: 007b ES: 007b CR0: 8005003b CR2: b7fac1f0 CR3: 311b3000 CR4: 000006d0 in test conformance/interfaces/timer_create/10-1.c (attached). The problem arises from code touching the union in alloc_posix_timer() which makes firing go non-zero. When firing is checked in posix_cpu_timer_set() it will be positive causing an infinite loop. So either the below fix or preferably move the INIT_LIST_HEAD(x) from alloc_posix_timer() to somewhere later where it doesn't disturb the other union members. Signed-off-by: Andrew Morton --- 25-akpm/kernel/posix-cpu-timers.c | 1 + 1 files changed, 1 insertion(+) diff -puN kernel/posix-cpu-timers.c~posix-timers-cpu-clock-support-for-posix-timers-fix2 kernel/posix-cpu-timers.c --- 25/kernel/posix-cpu-timers.c~posix-timers-cpu-clock-support-for-posix-timers-fix2 2005-02-21 15:54:34.000000000 -0800 +++ 25-akpm/kernel/posix-cpu-timers.c 2005-02-21 15:54:34.000000000 -0800 @@ -312,6 +312,7 @@ int posix_cpu_timer_create(struct k_itim INIT_LIST_HEAD(&new_timer->it.cpu.entry); new_timer->it.cpu.incr.sched = 0; new_timer->it.cpu.expires.sched = 0; + new_timer->it.cpu.firing = 0; read_lock(&tasklist_lock); if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) { _