Hi,
Using the v2.4.3 +kernel 2.6.24.7 I used the system("touch /tmp/xxx_ok")
call in a non realtime init context.
The task is only used to allocate some memory heaps.
I setted up some memory debugging features in the kernel :
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_SLAB_LEAK=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_VM=y
CONFIG_FORCED_INLINING=y
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_PAGEALLOC=y
This was not happening with v2.4.2 although that the kernel debugging
flags were not "on"
here is the bug trace :
------------[ cut here ]------------
kernel BUG at mm/rmap.c:602!
invalid opcode: 0000 [#1] PREEMPT DEBUG_PAGEALLOC
Modules linked in: usb_storage e100 mii
Pid: 1628, comm: creven Not tainted (2.6.24.7-ipipe #3)
EIP: 0060:[<c017fb49>] EFLAGS: 00010246 CPU: 0
EIP is at page_dup_rmap+0x19/0x20
EAX: c115e760 EBX: c115e760 ECX: 08048000 EDX: cc6b1200
ESI: 09cbb025 EDI: 00000025 EBP: 08048000 ESP: cc709ec4
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process creven (pid: 1628, ti=cc708000 task=cc6f6ac0 task.ti=cc708000)<0>
I-pipe domain Linux
Stack: 08003875 c017ae62 cc6b1200 cd5d9e70 cc6b4e70 cc6fa080 cc650080
08057000
08057000 c115e760 cd034120 c9cba120 00000000 00000000 08056fff
00000000
00000000 c9c6ec80 cc6b1200 00000000 cc6a6ac0 c0115b90 00000000
00000000
Call Trace:
[<c017ae62>] copy_page_range+0x2b2/0x580
[<c0115b90>] copy_process+0x7a0/0x1000
[<c01165a7>] do_fork+0x47/0x210
[<c0100bb6>] sys_clone+0x36/0x40
[<c0102b89>] syscall_call+0x7/0xb
=======================
Code: 3b 4b 08 0f 93 c0 85 c0 75 ba 5b 89 c8 c3 8d 74 26 00 53 89 c3 83
78 08 ff 74 10 f6 40 10 01 74 05 e8 3c f4 ff ff ff 43 08 5b c3 <0f> 0b
eb fe 8d 76 00 83 ec 1c 89 5c 24 0c 89 c3 89 74 24 10 89
EIP: [<c017fb49>] page_dup_rmap+0x19/0x20 SS:ESP 0068:cc709ec4
---[ end trace b9f3cc48844f8a3b ]---
note: creven[1628] exited with preempt_count 2
BUG: scheduling while atomic: creven/1628/0x00000003
Pid: 1628, comm: creven Tainted: G D 2.6.24.7-ipipe #3
[<c036bed3>] schedule+0x283/0x390
[<c036d525>] rwsem_down_failed_common+0x75/0x190
[<c013cb10>] handle_edge_irq+0xc0/0x150
[<c036d68d>] rwsem_down_read_failed+0x1d/0x24
[<c036d6cb>] call_rwsem_down_read_failed+0x7/0xc
[<c036cb89>] down_read+0x9/0x10
[<c0118ed4>] exit_mm+0x24/0xd0
[<c011a632>] do_exit+0x112/0x800
[<c010410f>] die+0x21f/0x220
[<c0104523>] do_invalid_op+0x83/0x90
[<c017fb49>] page_dup_rmap+0x19/0x20
[<c0111998>] change_page_attr+0x2c8/0x300
[<c01119ed>] kernel_map_pages+0x1d/0x60
[<c0170472>] get_page_from_freelist+0x2c2/0x520
[<c010e78f>] __ipipe_handle_exception+0x7f/0x1c0
[<c036db5b>] error_code+0x6f/0x7c
[<c0170000>] setup_per_zone_pages_min+0x1b0/0x1f0
[<c017fb49>] page_dup_rmap+0x19/0x20
[<c017ae62>] copy_page_range+0x2b2/0x580
[<c0115b90>] copy_process+0x7a0/0x1000
[<c01165a7>] do_fork+0x47/0x210
[<c0100bb6>] sys_clone+0x36/0x40
[<c0102b89>] syscall_call+0x7/0xb
=======================
Best Regards
Steph
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