Messages in this thread | | | Date | Mon, 25 Jul 2011 15:05:14 +0300 | From | Sergey Senozhatsky <> | Subject | DEBUG_LOCKS_WARN_ON() within lockdep trace_hardirqs_on_caller() |
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Hello,
Current 3.1.0-git3 (03873-g2c9c838), x86_64, has triggered an DEBUG_LOCKS_WARN_ON() within trace_hardirqs_on_caller()
[ 4364.656167] ------------[ cut here ]------------ [ 4364.656186] WARNING: at kernel/lockdep.c:2532 trace_hardirqs_on_caller+0x6d/0x166() [ 4364.656191] Hardware name: Aspire 5741G [ 4364.656264] Pid: 26796, comm: conftest Not tainted 3.1.0-dbg-03873-g2c9c838-dirty #652 [ 4364.656269] Call Trace: [ 4364.656279] [<ffffffff8103e970>] warn_slowpath_common+0x7e/0x96 [ 4364.656289] [<ffffffff81477056>] ? __bad_area_nosemaphore+0x35/0x1b9 [ 4364.656296] [<ffffffff8103e99d>] warn_slowpath_null+0x15/0x17 [ 4364.656303] [<ffffffff81072770>] trace_hardirqs_on_caller+0x6d/0x166 [ 4364.656310] [<ffffffff81072876>] trace_hardirqs_on+0xd/0xf [ 4364.656317] [<ffffffff81477056>] __bad_area_nosemaphore+0x35/0x1b9 [ 4364.656324] [<ffffffff8147722f>] bad_area+0x45/0x4c [ 4364.656333] [<ffffffff814850f9>] do_page_fault+0x2da/0x48a [ 4364.656343] [<ffffffff810ec2d0>] ? do_brk+0x24e/0x2a2 [ 4364.656352] [<ffffffff8124642d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 4364.656360] [<ffffffff81482975>] page_fault+0x25/0x30 [ 4364.656366] ---[ end trace 9870b4ffc9ea6750 ]---
I guess, local_irq_enable() gets called 2 times in do_page_fault(). First,
1051 if (user_mode_vm(regs)) { 1052 local_irq_enable(); 1053 error_code |= PF_USER; 1054 } else { 1055 if (regs->flags & X86_EFLAGS_IF) 1056 local_irq_enable(); 1057 }
and later within one of bad_area-cases, e.g., 1106 vma = find_vma(mm, address); 1107 if (unlikely(!vma)) { 1108 bad_area(regs, error_code, address); 1109 return; 1110 }
hitting assertion `!irqs_disabled()' failure in lockdep trace_hardirqs_on_caller().
Sergey
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