lockdep: annotate kprobes irq fiddling

PATCH In review Peter Zijlstra 2 participants 2 messages Oct 3, 2007

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Peter Zijlstra

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2007-10-03 10:49 UTC #0 lore raw

PATCH 1/1 lockdep: annotate kprobes irq fiddling

Hi,

The below patch fixes a lockdep error in 2.6.23-rc9 when using tcp_probe.

---

Subject: lockdep: annotate kprobes irq fiddling

kprobes disables irqs for jprobes, but does not tell lockdep about it.

CC Prasanna S Panchamukhi <[email protected]>

CC Ananth N Mavinakayanahalli <[email protected]>

CC Anil S Keshavamurthy <[email protected]>

CC David S. Miller <[email protected]>

Signed-off-by Peter Zijlstra <[email protected]>

Signed-off-by Ingo Molnar <[email protected]>

---
 arch/i386/kernel/kprobes.c   |    8 ++++++++
 arch/x86_64/kernel/kprobes.c |    8 ++++++++
 2 files changed, 16 insertions(+)

arch/i386/kernel/kprobes.c +8 -0

Index: linux-2.6-2/arch/i386/kernel/kprobes.c
===================================================================
@@ -558,6 +558,13 @@ static int __kprobes post_kprobe_handler
 
 	resume_execution(cur, regs, kcb);
 	regs->eflags |= kcb->kprobe_saved_eflags;
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+	if (raw_irqs_disabled_flags(regs->eflags)) {
+		trace_hardirqs_off();
+	} else {
+		trace_hardirqs_on();
+	}
+#endif
 
 	/*Restore back the original saved kprobes variables and continue. */
 	if (kcb->kprobe_status == KPROBE_REENTER) {

@@ -695,6 +702,7 @@ int __kprobes setjmp_pre_handler(struct 
 	memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr,
 			MIN_STACK_SIZE(addr));
 	regs->eflags &= ~IF_MASK;
+	trace_hardirqs_off();
 	regs->eip = (unsigned long)(jp->entry);
 	return 1;
 }

arch/x86_64/kernel/kprobes.c +8 -0

Index: linux-2.6-2/arch/x86_64/kernel/kprobes.c
===================================================================
@@ -545,6 +545,13 @@ int __kprobes post_kprobe_handler(struct
 
 	resume_execution(cur, regs, kcb);
 	regs->eflags |= kcb->kprobe_saved_rflags;
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+	if (raw_irqs_disabled_flags(regs->eflags)) {
+		trace_hardirqs_off();
+	} else {
+		trace_hardirqs_on();
+	}
+#endif
 
 	/* Restore the original saved kprobes variables and continue. */
 	if (kcb->kprobe_status == KPROBE_REENTER) {

@@ -685,6 +692,7 @@ int __kprobes setjmp_pre_handler(struct 
 	memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr,
 			MIN_STACK_SIZE(addr));
 	regs->eflags &= ~IF_MASK;
+	trace_hardirqs_off();
 	regs->rip = (unsigned long)(jp->entry);
 	return 1;
 }

Ingo Molnar

2007-10-03 10:52 UTC #1 lore raw

Quoted 10 lines · Peter Zijlstra

Hi,
The below patch fixes a lockdep error in 2.6.23-rc9 when using tcp_probe.
---
Subject: lockdep: annotate kprobes irq fiddling
kprobes disables irqs for jprobes, but does not tell lockdep about it.

this resolves this warning during an allyesconfig bzImage bootup test:

 [  423.670337] WARNING: at kernel/lockdep.c:2658 check_flags()
 [  423.670341]  [<c0107f01>] show_trace_log_lvl+0x19/0x2e
 [  423.670348]  [<c0107ffa>] show_trace+0x12/0x14
 [  423.670350]  [<c0108010>] dump_stack+0x14/0x16
 [  423.670353]  [<c015249d>] check_flags+0x95/0x142
 [  423.670357]  [<c0155576>] lock_acquire+0x52/0xb8
 [  423.670360]  [<c1313c90>] _spin_lock+0x2e/0x58
 [  423.670365]  [<c11b72f9>] jtcp_rcv_established+0x6e/0x189
 [  423.670369]  [<c11810da>] tcp_v4_do_rcv+0x30b/0x620
 [  423.670373]  [<c1181c8c>] tcp_v4_rcv+0x89d/0x8fa
 [  423.670376]  [<c1167dba>] ip_local_deliver+0x17d/0x225
 [  423.670380]  [<c11682f5>] ip_rcv+0x493/0x4ce
 [  423.670383]  [<c11177ef>] netif_receive_skb+0x347/0x365
 [  423.670388]  [<c07b6e7b>] nv_napi_poll+0x501/0x6c3
 [  423.670393]  [<c1115b1a>] net_rx_action+0xa3/0x1b6
 [  423.670396]  [<c013bdee>] __do_softirq+0x76/0xfb
 [  423.670400]  [<c0109189>] do_softirq+0x75/0xf3

Ingo