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Date: Mon, 13 May 2013 16:22:12 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: tglx@...utronix.de, rusty@...tcorp.com.au
Cc: linux-kernel@...r.kernel.org
Subject: [3.10-rc1] tick: NULL pointer dereference at tick_handle_oneshot_broadcast
I\'m hitting below bug on bootup.
[ 1.215727] Switching to clocksource hpet
[ 1.217475] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 1.218467] IP: [<ffffffff810ac77c>] tick_handle_oneshot_broadcast+0xdc/0x280
[ 1.218488] PGD 0
[ 1.218509] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 1.218530] Modules linked in:
[ 1.218550] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc1 #72
[ 1.218571] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/20/2012
[ 1.218592] task: ffff88007ad58000 ti: ffff88007acde000 task.ti: ffff88007acde000
[ 1.218613] RIP: 0010:[<ffffffff810ac77c>] [<ffffffff810ac77c>] tick_handle_oneshot_broadcast+0xdc/0x280
[ 1.218634] RSP: 0000:ffff88007b203df8 EFLAGS: 00010083
[ 1.218655] RAX: 0000000000000004 RBX: 7fffffffffffffff RCX: 0000000000000010
[ 1.218676] RDX: 0000000000000004 RSI: 0000000000000010 RDI: 0000000000000000
[ 1.218697] RBP: ffff88007b203e48 R08: ffff88007ac05578 R09: 0000000000000000
[ 1.218717] R10: ffff88007ac05570 R11: 7fffffffffffffff R12: 7fffffffffffffff
[ 1.218738] R13: 000000000000d700 R14: 0000000000000000 R15: ffffffff81e1f040
[ 1.218759] FS: 0000000000000000(0000) GS:ffff88007b200000(0000) knlGS:0000000000000000
[ 1.218780] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.218801] CR2: 0000000000000018 CR3: 0000000001e0b000 CR4: 00000000000407f0
[ 1.218822] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1.218843] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1.218864] Stack:
[ 1.218884] ffff88007b203e68 0000000000000086 ffff88007b203e18 000000003ec3dd69
[ 1.218905] ffff88007b203e38 ffffffff81e12680 ffff88007ac08488 0000000000000000
[ 1.218926] ffff88007acdfb48 0000000000000000 ffff88007b203e58 ffffffff81005145
[ 1.218947] Call Trace:
[ 1.218968] <IRQ>
[ 1.218989] [<ffffffff81005145>] timer_interrupt+0x15/0x20
[ 1.219041] [<ffffffff810e9f45>] handle_irq_event_percpu+0x95/0x380
[ 1.219071] [<ffffffff810ea278>] handle_irq_event+0x48/0x70
[ 1.219101] [<ffffffff810ed9bd>] handle_edge_irq+0x6d/0x130
[ 1.219130] [<ffffffff8100491c>] handle_irq+0x5c/0x150
[ 1.219170] [<ffffffff811a4b78>] ? d_alloc+0x68/0x80
[ 1.219202] [<ffffffff81048c2b>] ? irq_enter+0x1b/0x90
[ 1.219233] [<ffffffff8182f27d>] do_IRQ+0x5d/0xe0
[ 1.219263] [<ffffffff811a4b78>] ? d_alloc+0x68/0x80
[ 1.219294] [<ffffffff818248af>] common_interrupt+0x6f/0x6f
[ 1.219315] <EOI>
[ 1.219335] [<ffffffff810b021d>] ? trace_hardirqs_off+0xd/0x10
[ 1.219386] [<ffffffff810b71de>] ? lock_release+0x7e/0x130
[ 1.219417] [<ffffffff818245a3>] _raw_spin_unlock+0x23/0x50
[ 1.219447] [<ffffffff811a4b78>] d_alloc+0x68/0x80
[ 1.219478] [<ffffffff81198793>] lookup_dcache+0xa3/0xd0
[ 1.219508] [<ffffffff811987e3>] __lookup_hash+0x23/0x50
[ 1.219540] [<ffffffff811993e1>] lookup_one_len+0xd1/0x120
[ 1.219571] [<ffffffff81293313>] __create_file+0x93/0x2a0
[ 1.219601] [<ffffffff812935da>] debugfs_create_file+0x1a/0x30
[ 1.219631] [<ffffffff81108f8c>] trace_create_file+0x1c/0x50
[ 1.219660] [<ffffffff81109102>] tracing_init_debugfs_percpu+0xa2/0x210
[ 1.219691] [<ffffffff8110bd78>] init_tracer_debugfs+0x188/0x1e0
[ 1.219723] [<ffffffff820f137b>] tracer_init_debugfs+0x78/0x20f
[ 1.219755] [<ffffffff820f1303>] ? clear_boot_tracer+0x2d/0x2d
[ 1.219785] [<ffffffff810002c2>] do_one_initcall+0xf2/0x1a0
[ 1.219816] [<ffffffff820d385c>] do_basic_setup+0x9d/0xbb
[ 1.219849] [<ffffffff820d39ad>] ? kernel_init_freeable+0x133/0x133
[ 1.219879] [<ffffffff820d3934>] kernel_init_freeable+0xba/0x133
[ 1.219909] [<ffffffff8180f900>] ? rest_init+0x180/0x180
[ 1.219938] [<ffffffff8180f90e>] kernel_init+0xe/0xf0
[ 1.219969] [<ffffffff8182dddc>] ret_from_fork+0x7c/0xb0
[ 1.219999] [<ffffffff8180f900>] ? rest_init+0x180/0x180
[ 1.220020] Code: 63 f1 48 89 c7 48 63 d2 e8 42 e5 26 00 8b 0d e4 6f e4 00 89 c2 39 c8 89 ce 7d 74 48 63 fa 48 8b 3c fd 40 23 ef 81 49 8b 7c 3d 00 <4c> 8b 47 18 4c 3b 45 c8 7e 1a 4d 39 e0 7d a5 83 fa ff 41 89 c6
[ 1.220040] RIP [<ffffffff810ac77c>] tick_handle_oneshot_broadcast+0xdc/0x280
[ 1.220061] RSP <ffff88007b203df8>
[ 1.220082] CR2: 0000000000000018
[ 1.220103] ---[ end trace c8cac818edfcf493 ]---
[ 1.220124] Kernel panic - not syncing: Fatal exception in interrupt
Config is at http://I-love.SAKURA.ne.jp/tmp/config-3.10-rc1
Full dmesg is at http://I-love.SAKURA.ne.jp/tmp/dmesg-3.10-rc1.txt
Below patch
---------- debug printk() start ----------
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 206bbfb..952df89 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -189,7 +189,9 @@ static void tick_do_broadcast(struct cpumask *mask)
if (cpumask_test_cpu(cpu, mask)) {
cpumask_clear_cpu(cpu, mask);
td = &per_cpu(tick_cpu_device, cpu);
- td->evtdev->event_handler(td->evtdev);
+ printk(KERN_INFO \"test=%d td=%p td->evtdev=%p\\n\", cpu, td, td->evtdev);
+ if (td->evtdev)
+ td->evtdev->event_handler(td->evtdev);
}
if (!cpumask_empty(mask)) {
@@ -200,7 +202,9 @@ static void tick_do_broadcast(struct cpumask *mask)
* misfeature only on x86 (lapic)
*/
td = &per_cpu(tick_cpu_device, cpumask_first(mask));
- td->evtdev->broadcast(mask);
+ printk(KERN_INFO \"first td=%p td->evtdev=%p\\n\", td, td->evtdev);
+ if (td->evtdev)
+ td->evtdev->broadcast(mask);
}
}
@@ -497,6 +501,9 @@ again:
/* Find all expired events */
for_each_cpu(cpu, tick_broadcast_oneshot_mask) {
td = &per_cpu(tick_cpu_device, cpu);
+ printk(KERN_INFO \"cpu=%d td=%p td->evtdev=%p\\n\", cpu, td, td->evtdev);
+ if (!td->evtdev)
+ continue;
if (td->evtdev->next_event.tv64 <= now.tv64) {
cpumask_set_cpu(cpu, tmpmask);
/*
---------- debug printk() end ----------
makes my kernel boots OK, with reports that some of td->evtdev == NULL.
---------- debug output start ----------
[ 1.205720] Switching to clocksource hpet
[ 1.207419] cpu=4 td=ffff88007ba0d700 td->evtdev= (null)
[ 1.208919] cpu=5 td=ffff88007bc0d700 td->evtdev= (null)
[ 1.210480] cpu=6 td=ffff88007be0d700 td->evtdev= (null)
[ 1.212008] cpu=7 td=ffff88007c00d700 td->evtdev= (null)
[ 1.213560] cpu=8 td=ffff88007c20d700 td->evtdev= (null)
[ 1.215094] cpu=10 td=ffff88007c60d700 td->evtdev= (null)
[ 1.216624] cpu=12 td=ffff88007ca0d700 td->evtdev= (null)
[ 1.218250] cpu=14 td=ffff88007ce0d700 td->evtdev= (null)
[ 1.219768] first td=ffff88007ba0d700 td->evtdev= (null)
[ 1.295536] pnp: PnP ACPI init
---------- debug output end ----------
My VM has 4 CPUs and CONFIG_NR_CPUS is set to 16. Thus it seems to me that
td->evtdev for nonexistent (and by other reasons?) cpu became NULL.
I don\'t know why but bisection reached commit b352bc1c
\"tick: Convert broadcast cpu bitmaps to cpumask_var_t\".
Regards.
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