d91309f69b
Fix this deadlock - we are already holding the mutex: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.38-rc4-test+ #1 ------------------------------------------------------- bash/1850 is trying to acquire lock: (text_mutex){+.+.+.}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f but task is already holding lock: (smp_alt){+.+...}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (smp_alt){+.+...}: [<ffffffff81082d02>] lock_acquire+0xcd/0xf8 [<ffffffff8192e119>] __mutex_lock_common+0x4c/0x339 [<ffffffff8192e4ca>] mutex_lock_nested+0x3e/0x43 [<ffffffff8101050f>] alternatives_smp_switch+0x77/0x1d8 [<ffffffff81926a6f>] do_boot_cpu+0xd7/0x762 [<ffffffff819277dd>] native_cpu_up+0xe6/0x16a [<ffffffff81928e28>] _cpu_up+0x9d/0xee [<ffffffff81928f4c>] cpu_up+0xd3/0xe7 [<ffffffff82268d4b>] kernel_init+0xe8/0x20a [<ffffffff8100ba24>] kernel_thread_helper+0x4/0x10 -> #1 (cpu_hotplug.lock){+.+.+.}: [<ffffffff81082d02>] lock_acquire+0xcd/0xf8 [<ffffffff8192e119>] __mutex_lock_common+0x4c/0x339 [<ffffffff8192e4ca>] mutex_lock_nested+0x3e/0x43 [<ffffffff810568cc>] get_online_cpus+0x41/0x55 [<ffffffff810a1348>] stop_machine+0x1e/0x3e [<ffffffff819314c1>] text_poke_smp_batch+0x3a/0x3c [<ffffffff81932b6c>] arch_optimize_kprobes+0x10d/0x11c [<ffffffff81933a51>] kprobe_optimizer+0x152/0x222 [<ffffffff8106bb71>] process_one_work+0x1d3/0x335 [<ffffffff8106cfae>] worker_thread+0x104/0x1a4 [<ffffffff810707c4>] kthread+0x9d/0xa5 [<ffffffff8100ba24>] kernel_thread_helper+0x4/0x10 -> #0 (text_mutex){+.+.+.}: other info that might help us debug this: 6 locks held by bash/1850: #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f #1: (s_active#75){.+.+.+}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f #2: (x86_cpu_hotplug_driver_mutex){+.+.+.}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f #3: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f #4: (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f #5: (smp_alt){+.+...}, at: [<ffffffff8100a9c1>] return_to_handler+0x0/0x2f stack backtrace: Pid: 1850, comm: bash Not tainted 2.6.38-rc4-test+ #1 Call Trace: [<ffffffff81080eb2>] print_circular_bug+0xa8/0xb7 [<ffffffff8192e4ca>] mutex_lock_nested+0x3e/0x43 [<ffffffff81010302>] alternatives_smp_unlock+0x3d/0x93 [<ffffffff81010630>] alternatives_smp_switch+0x198/0x1d8 [<ffffffff8102568a>] native_cpu_die+0x65/0x95 [<ffffffff818cc4ec>] _cpu_down+0x13e/0x202 [<ffffffff8117a619>] sysfs_write_file+0x108/0x144 [<ffffffff8111f5a2>] vfs_write+0xac/0xff [<ffffffff8111f7a9>] sys_write+0x4a/0x6e Reported-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: mathieu.desnoyers@efficios.com Cc: rusty@rustcorp.com.au Cc: ananth@in.ibm.com Cc: masami.hiramatsu.pt@hitachi.com Cc: fweisbec@gmail.com Cc: jbeulich@novell.com Cc: jbaron@redhat.com Cc: mhiramat@redhat.com LKML-Reference: <1297458466.5226.93.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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.. | ||
acpi | ||
apic | ||
cpu | ||
.gitignore | ||
alternative.c | ||
amd_iommu.c | ||
amd_iommu_init.c | ||
amd_nb.c | ||
apb_timer.c | ||
aperture_64.c | ||
apm_32.c | ||
asm-offsets.c | ||
asm-offsets_32.c | ||
asm-offsets_64.c | ||
audit_64.c | ||
bootflag.c | ||
check.c | ||
cpuid.c | ||
crash.c | ||
crash_dump_32.c | ||
crash_dump_64.c | ||
doublefault_32.c | ||
dumpstack.c | ||
dumpstack_32.c | ||
dumpstack_64.c | ||
e820.c | ||
early-quirks.c | ||
early_printk.c | ||
entry_32.S | ||
entry_64.S | ||
ftrace.c | ||
head.c | ||
head32.c | ||
head64.c | ||
head_32.S | ||
head_64.S | ||
hpet.c | ||
hw_breakpoint.c | ||
i386_ksyms_32.c | ||
i387.c | ||
i8237.c | ||
i8253.c | ||
i8259.c | ||
init_task.c | ||
io_delay.c | ||
ioport.c | ||
irq.c | ||
irq_32.c | ||
irq_64.c | ||
irq_work.c | ||
irqinit.c | ||
jump_label.c | ||
kdebugfs.c | ||
kgdb.c | ||
kprobes.c | ||
kvm.c | ||
kvmclock.c | ||
ldt.c | ||
machine_kexec_32.c | ||
machine_kexec_64.c | ||
Makefile | ||
mca_32.c | ||
microcode_amd.c | ||
microcode_core.c | ||
microcode_intel.c | ||
mmconf-fam10h_64.c | ||
module.c | ||
mpparse.c | ||
msr.c | ||
paravirt-spinlocks.c | ||
paravirt.c | ||
paravirt_patch_32.c | ||
paravirt_patch_64.c | ||
pci-calgary_64.c | ||
pci-dma.c | ||
pci-gart_64.c | ||
pci-iommu_table.c | ||
pci-nommu.c | ||
pci-swiotlb.c | ||
pcspeaker.c | ||
probe_roms_32.c | ||
process.c | ||
process_32.c | ||
process_64.c | ||
ptrace.c | ||
pvclock.c | ||
quirks.c | ||
reboot.c | ||
reboot_fixups_32.c | ||
relocate_kernel_32.S | ||
relocate_kernel_64.S | ||
resource.c | ||
rtc.c | ||
setup.c | ||
setup_percpu.c | ||
signal.c | ||
smp.c | ||
smpboot.c | ||
stacktrace.c | ||
step.c | ||
sys_i386_32.c | ||
sys_x86_64.c | ||
syscall_64.c | ||
syscall_table_32.S | ||
tboot.c | ||
tce_64.c | ||
test_nx.c | ||
test_rodata.c | ||
time.c | ||
tls.c | ||
tls.h | ||
topology.c | ||
trampoline.c | ||
trampoline_32.S | ||
trampoline_64.S | ||
traps.c | ||
tsc.c | ||
tsc_sync.c | ||
verify_cpu.S | ||
vm86_32.c | ||
vmlinux.lds.S | ||
vsmp_64.c | ||
vsyscall_64.c | ||
x86_init.c | ||
x8664_ksyms_64.c | ||
xsave.c |