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Old 12-17-2011, 02:44 PM   #1
rrlangly
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Thread overran stack, or stack corrupted


I think the main error here is "Thread overran stack, or stack corrupted", but I'm not sure what that means in relation to what I might be doing wrong in my module. Can anyone explain this better or have any thoughts as to how to track down this oops?

Code:
[  599.455035] BUG: unable to handle kernel paging request at 0000000000010d40
[  599.456017] IP: [<ffffffff8105eb1a>] resched_task+0x1a/0x60
[  599.456017] PGD 1d821067 PUD 1da27067 PMD 0
[  599.456017] Thread overran stack, or stack corrupted
[  599.456017] Oops: 0000 [#1] SMP
[  599.456017] CPU 0
[  599.456017] Modules linked in: mod2 mod1
[  599.456017]
[  599.456017] Pid: 1744, comm: udptest Tainted: G        W   3.0.6-gentoo #7 Bochs Bochs
[  599.456017] RIP: 0010:[<ffffffff8105eb1a>]  [<ffffffff8105eb1a>] resched_task+0x1a/0x60
[  599.456017] RSP: 0018:ffff88001fa03df8  EFLAGS: 00010002
[  599.456017] RAX: 0000000000010d40 RBX: ffff88001fa10db0 RCX: 0000000000000080
[  599.456017] RDX: ffff88001d972000 RSI: 0000000000000c00 RDI: ffff88001e08b3a0
[  599.456017] RBP: ffff88001fa03df8 R08: 0000000000000000 R09: ffff88001fa10d60
[  599.456017] R10: ffff88001fa03dd8 R11: ffff88001e08b3e8 R12: ffff88001e08b3e8
[  599.456017] R13: 0000000000000000 R14: ffff88001fa03f48 R15: 7fffffffffffffff
[  599.456017] FS:  00007fc29ac96700(0000) GS:ffff88001fa00000(0000) knlGS:0000000000000000
[  599.456017] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  599.456017] CR2: 0000000000010d40 CR3: 000000001d80c000 CR4: 00000000000006f0
[  599.456017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  599.456017] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  599.456017] Process udptest (pid: 1744, threadinfo ffff88001d972000, task ffff88001e08b3a0)
[  599.456017] Stack:
[  599.456017]  ffff88001fa03e28 ffffffff81068271 ffff88001fa10d40 ffff88001fa10d40
[  599.456017]  0000000000000000 ffff88001e08b3a0 ffff88001fa03e58 ffffffff81066221
[  599.456017]  ffff88001e08b3a0 ffff88001e08b3a0 0000000000000000 0000000000000000
[  599.456017] Call Trace:
[  599.456017]  <IRQ>
[  599.456017]  [<ffffffff81068271>] task_tick_fair+0x96/0x100
[  599.456017]  [<ffffffff81066221>] scheduler_tick+0xc1/0x259
[  599.456017]  [<ffffffff81079985>] update_process_times+0x62/0x73
[  599.456017]  [<ffffffff810956f1>] tick_sched_timer+0x6d/0x96
[  599.456017]  [<ffffffff8108b33c>] __run_hrtimer+0xb8/0x143
[  599.456017]  [<ffffffff81095684>] ? tick_nohz_handler+0xd6/0xd6
[  599.456017]  [<ffffffff8108b5f1>] hrtimer_interrupt+0xd5/0x19f
[  599.456017]  [<ffffffff81048c44>] smp_apic_timer_interrupt+0x81/0x94
[  599.456017]  [<ffffffff8159e293>] apic_timer_interrupt+0x13/0x20
[  599.456017]  <EOI>
[  599.456017] Code: 7e 28 00 75 e6 31 c0 48 83 7f 18 00 0f 94 c0 c9 c3 55 48 c7 c0 40 0d 01 00 48 8b 57 08 48 89 e5 8b 4a 18 48 03 04 cd 90 21 a8 81 <8b> 00 89 c1 c1 f9 08 38 c1 75 04 0f 0b eb fe 48 8b 42 10 a8 08
[  599.456017] RIP  [<ffffffff8105eb1a>] resched_task+0x1a/0x60
[  599.456017]  RSP <ffff88001fa03df8>
[  599.456017] CR2: 0000000000010d40
[  599.456017] ---[ end trace fadf069c92748739 ]---
[  599.456017] Kernel panic - not syncing: Fatal exception in interrupt
[  599.456017] Pid: 1744, comm: udptest Tainted: G      D W   3.0.6-gentoo #7
[  599.456017] Call Trace:
[  599.456017]  <IRQ>  [<ffffffff81595303>] panic+0x8c/0x195
[  599.456017]  [<ffffffff8159834f>] oops_end+0xb1/0xc1
[  599.456017]  [<ffffffff81056cf4>] no_context+0x1f7/0x206
[  599.456017]  [<ffffffff81056e8b>] __bad_area_nosemaphore+0x188/0x1ab
[  599.456017]  [<ffffffff81056ebc>] bad_area_nosemaphore+0xe/0x10
[  599.456017]  [<ffffffff8159a273>] do_page_fault+0x1c6/0x38c
[  599.456017]  [<ffffffff81068c3a>] ? enqueue_task_fair+0x3fc/0x40b
[  599.456017]  [<ffffffff8159546f>] ? printk+0x63/0x65
[  599.456017]  [<ffffffff8159526c>] ? dump_stack+0x77/0x82
[  599.456017]  [<ffffffff81599ca2>] do_async_page_fault+0x49/0x6b
[  599.456017]  [<ffffffff81597855>] async_page_fault+0x25/0x30
[  599.456017]  [<ffffffff8105eb1a>] ? resched_task+0x1a/0x60
[  599.456017]  [<ffffffff81068271>] task_tick_fair+0x96/0x100
[  599.456017]  [<ffffffff81066221>] scheduler_tick+0xc1/0x259
[  599.456017]  [<ffffffff81079985>] update_process_times+0x62/0x73
[  599.456017]  [<ffffffff810956f1>] tick_sched_timer+0x6d/0x96
[  599.456017]  [<ffffffff8108b33c>] __run_hrtimer+0xb8/0x143
[  599.456017]  [<ffffffff81095684>] ? tick_nohz_handler+0xd6/0xd6
[  599.456017]  [<ffffffff8108b5f1>] hrtimer_interrupt+0xd5/0x19f
[  599.456017]  [<ffffffff81048c44>] smp_apic_timer_interrupt+0x81/0x94
[  599.456017]  [<ffffffff8159e293>] apic_timer_interrupt+0x13/0x20
[  599.456017]  <EOI>
 
Old 12-20-2011, 11:04 PM   #2
gary185
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Registered: Jul 2011
Posts: 113

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the kernel places the value STACK_END_MAGIC at the end of the stack
when there is a fault in kernel space the value of STACK_END_MAGIC is checked
if it's been overwritten you get the message Thread overran stack, or stack corrupted
so basically you just ran the pointer past the stack end

stackend = end_of_stack(tsk);
if (tsk != &init_task && *stackend != STACK_END_MAGIC)
printk(KERN_ALERT "Thread overran stack, or stack corrupted\n");
 
  


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