http://bugzilla.kernel.org/show_bug.cgi?id=10202
Summary: KMalloc redzone overwritten at very old battery
insertion
Product: ACPI
Version: 2.5
KernelVersion: 2.6.25-rc4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version:Unknown <2.6.24
Earliest failing kernel version: 2.6.24
Distribution: Bluewhite64
Hardware Environment: Acer 1511 LMi laptop + very old battery (new battery
doesn't crash!)
Software Environment: /proc, cat
Problem Description:
When I plug a battery that has nearly no lifetime anymore, the kernel crashes
at any filesystem access (tested under 2.6.24), even if the cord is plugged.
With 2.6.25-rc4+debug options (especially kmalloc), it doesn't crash anymore,
but I got a very bad bug report:
=============================================================================
BUG kmalloc-96: Redzone overwritten
-----------------------------------------------------------------------------
INFO: 0xffff81004d9c8840-0xffff81004d9c8847. First byte 0x1 instead of 0xcc
INFO: Freed in scsi_execute_req+0xa1/0xf0 age=510 cpu=0 pid=3261
INFO: Slab 0xffffe200010fa3c0 used=5 fp=0xffff81004d9c8bd0
flags=0x4a0000000000c3
INFO: Object 0xffff81004d9c87e0 @offset=2016 fp=0x0000000000000002
Bytes b4 0xffff81004d9c87d0: 5d bb fe ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a
]»þÿ....ZZZZZZZZ
Object 0xffff81004d9c87e0: 04 00 00 00 04 00 00 00 f8 87 9c 4d 00 81 ff ff
........ø..M..ÿÿ
Object 0xffff81004d9c87f0: 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00
................
Object 0xffff81004d9c8800: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
Object 0xffff81004d9c8810: 01 00 00 00 00 00 00 00 ff ff ff ff 00 00 00 00
........ÿÿÿÿ....
Object 0xffff81004d9c8820: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
Object 0xffff81004d9c8830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
Redzone 0xffff81004d9c8840: 01 00 00 00 00 00 00 00
........
Padding 0xffff81004d9c8880: 5a 5a 5a 5a 5a 5a 5a 5a
ZZZZZZZZ
Pid: 3458, comm: cat Not tainted 2.6.25-rc4 #1
Call Trace:
[<ffffffff802889c7>] print_trailer+0xe7/0x170
[<ffffffff80288af5>] check_bytes_and_report+0xa5/0xd0
[<ffffffff8039f47a>] ? acpi_battery_get_state+0xe7/0xf8
[<ffffffff80288d85>] check_object+0x65/0x250
[<ffffffff8028a4a3>] __slab_free+0x263/0x370
[<ffffffff8028a738>] kfree+0xb8/0x130
[<ffffffff8039f47a>] ? acpi_battery_get_state+0xe7/0xf8
[<ffffffff8039f47a>] acpi_battery_get_state+0xe7/0xf8
[<ffffffff8039f67b>] acpi_battery_update+0x1f0/0x217
[<ffffffff802541b5>] ? trace_hardirqs_on+0xd5/0x160
[<ffffffff8039f6e6>] acpi_battery_read+0x1b/0x2c
[<ffffffff8039f71b>] acpi_battery_read_state+0x11/0x13
[<ffffffff802ab6bc>] seq_read+0x8c/0x2e0
[<ffffffff802ab630>] ? seq_read+0x0/0x2e0
[<ffffffff802ab630>] ? seq_read+0x0/0x2e0
[<ffffffff802d046f>] proc_reg_read+0x7f/0xc0
[<ffffffff8028ead4>] vfs_read+0xc4/0x160
[<ffffffff8028ef70>] sys_read+0x50/0x90
[<ffffffff8020b50b>] system_call_after_swapgs+0x7b/0x80
FIX kmalloc-96: Restoring 0xffff81004d9c8840-0xffff81004d9c8847=0xcc
Steps to reproduce:
I've never seen this one until this battery got dead (less than 4s of power). I
bought a new battery and it is OK, so I suspect battery power calculation to do
something wrong. At first, I thought the battery was demanding too much power
on the power supply, but since I've seen the kmalloc crash I reported this bug.
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