Hello,
Today I did what I should have done before: try to load and unload
tcm_mvsas kernel module. Surprised to see that this triggered kernel
oops. Did I make stupid mistake ?
What I did:
# rm -rf drivers/target/tcm_mvsas
# cd Documentation/target
# { echo yes; echo yes; } | ./tcm_mod_builder.py -m tcm_mvsas -p SAS
# cd ../..
# echo m | make oldconfig
# make prepare
# make M=drivers/target/tcm_mvsas modules modules_install
# modprobe tcm_mvsas
# rmmod tcm_mvsas
# rmmod target_core_mod
Segmentation fault
>From console:
<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>>>>>>>>>>>>>
Initialized struct target_fabric_configfs: ffff880027680000 for mvsas
<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>>>>>>
TCM_MVSAS[0] - Set fabric -> tcm_mvsas_fabric_configfs
<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>>>>>>>>>>>>>
Target_Core_ConfigFS: DEREGISTER -> Releasing tf: mvsas
<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>>>>>>
TCM_MVSAS[0] - Cleared tcm_mvsas_fabric_configfs
general protection fault: 0000 [#1] SMP
last sysfs file:
/sys/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-0:1.0/uevent
CPU 0
Modules linked in: target_core_mod(-) configfs netconsole iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi binfmt_misc psmouse
serio_raw shpchp i2c_piix4 mptspi mptscsih mptbase scsi_transport_spi
e1000 floppy [last unloaded: tcm_mvsas]
Pid: 2346, comm: rmmod Not tainted 2.6.38-rc2+
RIP: 0010:[<ffffffff810946a4>] [<ffffffff810946a4>] __lock_acquire+0x64/0x1510
RSP: 0018:ffff8800275cdb18 EFLAGS: 00010046
RAX: 0000000000000046 RBX: 6b6b6b6b6b6b6be3 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8800275cdbe8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88002cb4a350
FS: 00007f9238be4700(0000) GS:ffff88003d600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007f92386d1fc0 CR3: 0000000027560000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rmmod (pid: 2346, threadinfo ffff8800275cc000, task ffff88002cb4a350)
Stack:
0000000000000004 ffff88002cb4a350 ffffffff82033ee0 ffffffff81010dfd
ffff8800275cdb68 ffffffff81ed1590 ffff8800275cdb68 0000000000000000
32a19d8cf067a674 ffff88002cb4ab08 ffff8800275cdc48 0000000000000002
Call Trace:
[<ffffffff81010dfd>] ? save_stack_trace+0x2d/0x50
[<ffffffff81095bf0>] lock_acquire+0xa0/0x150
[<ffffffffa0146f8f>] ? detach_groups+0x2f/0x120 [configfs]
[<ffffffff81545a04>] ? __mutex_lock_common+0x2a4/0x3e0
[<ffffffffa0147004>] ? detach_groups+0xa4/0x120 [configfs]
[<ffffffff815472b6>] _raw_spin_lock+0x36/0x70
[<ffffffffa0146f8f>] ? detach_groups+0x2f/0x120 [configfs]
[<ffffffffa0146f8f>] detach_groups+0x2f/0x120 [configfs]
[<ffffffffa0146f46>] configfs_detach_group+0x16/0x30 [configfs]
[<ffffffffa0147012>] detach_groups+0xb2/0x120 [configfs]
[<ffffffffa0146f46>] configfs_detach_group+0x16/0x30 [configfs]
[<ffffffffa0147012>] detach_groups+0xb2/0x120 [configfs]
[<ffffffffa0146f46>] configfs_detach_group+0x16/0x30 [configfs]
[<ffffffffa0147012>] detach_groups+0xb2/0x120 [configfs]
[<ffffffffa0146f46>] configfs_detach_group+0x16/0x30 [configfs]
[<ffffffffa0147012>] detach_groups+0xb2/0x120 [configfs]
[<ffffffffa0146f46>] configfs_detach_group+0x16/0x30 [configfs]
[<ffffffffa0147122>] configfs_unregister_subsystem+0xa2/0x130 [configfs]
[<ffffffffa014fc84>] target_core_exit_configfs+0x184/0x1c0 [target_core_mod]
[<ffffffff810a0a32>] sys_delete_module+0x1a2/0x280
[<ffffffff81547019>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff81002f82>] system_call_fastpath+0x16/0x1b
Code: 8b 05 a1 64 9a 00 4c 89 75 f0 48 89 fb 41 89 d5 4c 8b 55 10 45
85 c0 0f 84 4a 04 00 00 8b 3d 08 96 cd 00 85 ff 0f 84 5c 04 00 00 <48>
81 3b 20 15 dd 81 b8 01 00 00 00 44 0f 44 e0 83 fe 01 0f 86
RIP [<ffffffff810946a4>] __lock_acquire+0x64/0x1510
RSP <ffff8800275cdb18>
---[ end trace f4ddfaa61a61623b ]---
Thanks for all help.
Fubo.
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