On Sat, 11 Aug 2018 22:50:12 +0000, Bart Van Assche
<[email protected]> wrote:
> On Sat, 2018-08-11 at 09:36 +0000, Vincent Pelletier wrote:
> > What can I try to help debug this further ?
>
> Can you try to reproduce this with KASAN enabled in the kernel config?
Here is the syslog with KASAN enabled:
Aug 12 04:44:53 boke kernel: [ 64.736033] iSCSI Login timeout on Network
Portal [::]:3260
Aug 12 04:44:53 boke kernel: [ 64.736449] iSCSI Login negotiation failed.
Aug 12 04:44:53 boke kernel: [ 64.736653]
==================================================================
Aug 12 04:44:53 boke kernel: [ 64.737069] BUG: KASAN: use-after-free in
iscsi_target_login_sess_out.cold.11+0x58/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.737515] Read of size 8 at addr
ffff880113ca6bc8 by task iscsi_np/992
Aug 12 04:44:53 boke kernel: [ 64.737814]
Aug 12 04:44:53 boke kernel: [ 64.737914] CPU: 0 PID: 992 Comm: iscsi_np
Tainted: G O 4.17.8kasan #1
Aug 12 04:44:53 boke kernel: [ 64.737920] Hardware name: To be filled by
O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014
Aug 12 04:44:53 boke kernel: [ 64.737924] Call Trace:
Aug 12 04:44:53 boke kernel: [ 64.737945] dump_stack+0x71/0xac
Aug 12 04:44:53 boke kernel: [ 64.737961]
print_address_description+0x65/0x22e
Aug 12 04:44:53 boke kernel: [ 64.738054] ?
iscsi_target_login_sess_out.cold.11+0x58/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738066] kasan_report.cold.6+0x241/0x2fd
Aug 12 04:44:53 boke kernel: [ 64.738157]
iscsi_target_login_sess_out.cold.11+0x58/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738246]
iscsi_target_login_thread+0x10c4/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738264] ? __sched_text_start+0x8/0x8
Aug 12 04:44:53 boke kernel: [ 64.738349] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738361] ? __kthread_parkme+0xcc/0x100
Aug 12 04:44:53 boke kernel: [ 64.738374] ? parse_args.cold.14+0xd3/0xd3
Aug 12 04:44:53 boke kernel: [ 64.738460] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738478] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.738491] ? kthread_bind+0x30/0x30
Aug 12 04:44:53 boke kernel: [ 64.738502] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.738510]
Aug 12 04:44:53 boke kernel: [ 64.738600] Allocated by task 992:
Aug 12 04:44:53 boke kernel: [ 64.738772] kasan_kmalloc+0xbf/0xe0
Aug 12 04:44:53 boke kernel: [ 64.738782] kmem_cache_alloc_trace+0x112/0x210
Aug 12 04:44:53 boke kernel: [ 64.738865]
iscsi_target_login_thread+0x844/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.738875] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.738884] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.738887]
Aug 12 04:44:53 boke kernel: [ 64.738973] Freed by task 992:
Aug 12 04:44:53 boke kernel: [ 64.739129] __kasan_slab_free+0x125/0x170
Aug 12 04:44:53 boke kernel: [ 64.739137] kfree+0x90/0x1d0
Aug 12 04:44:53 boke kernel: [ 64.739220]
iscsi_target_login_thread+0x15c7/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.739230] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.739239] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.739241]
Aug 12 04:44:53 boke kernel: [ 64.739330] The buggy address belongs to the
object at ffff880113ca6a00
Aug 12 04:44:53 boke kernel: [ 64.739330] which belongs to the cache
kmalloc-512 of size 512
Aug 12 04:44:53 boke kernel: [ 64.739877] The buggy address is located 456
bytes inside of
Aug 12 04:44:53 boke kernel: [ 64.739877] 512-byte region [ffff880113ca6a00,
ffff880113ca6c00)
Aug 12 04:44:53 boke kernel: [ 64.740385] The buggy address belongs to the
page:
Aug 12 04:44:53 boke kernel: [ 64.740611] page:ffffea00044f2980 count:1
mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
Aug 12 04:44:53 boke kernel: [ 64.741053] flags: 0x17fffc000008100(slab|head)
Aug 12 04:44:53 boke kernel: [ 64.741273] raw: 017fffc000008100
0000000000000000 0000000000000000 00000001000c000c
Aug 12 04:44:53 boke kernel: [ 64.741626] raw: dead000000000100
dead000000000200 ffff88011b002e00 0000000000000000
Aug 12 04:44:53 boke kernel: [ 64.741971] page dumped because: kasan: bad
access detected
Aug 12 04:44:53 boke kernel: [ 64.742222]
Aug 12 04:44:53 boke kernel: [ 64.742304] Memory state around the buggy
address:
Aug 12 04:44:53 boke kernel: [ 64.742531] ffff880113ca6a80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.742858] ffff880113ca6b00: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.747255] >ffff880113ca6b80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.751156]
^
Aug 12 04:44:53 boke kernel: [ 64.755081] ffff880113ca6c00: fc fc fc fc fc
fc fc fc fc fc fc fc fc fc fc fc
Aug 12 04:44:53 boke kernel: [ 64.758397] ffff880113ca6c80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.762372]
==================================================================
Aug 12 04:44:53 boke kernel: [ 64.768126] Disabling lock debugging due to
kernel taint
Aug 12 04:44:53 boke kernel: [ 64.768226]
==================================================================
Aug 12 04:44:53 boke kernel: [ 64.771148] BUG: KASAN: double-free or
invalid-free in iscsi_target_login_sess_out.cold.11+0x103/0x123
[iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.776782]
Aug 12 04:44:53 boke kernel: [ 64.779480] CPU: 0 PID: 992 Comm: iscsi_np
Tainted: G B O 4.17.8kasan #1
Aug 12 04:44:53 boke kernel: [ 64.779483] Hardware name: To be filled by
O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014
Aug 12 04:44:53 boke kernel: [ 64.779486] Call Trace:
Aug 12 04:44:53 boke kernel: [ 64.779499] dump_stack+0x71/0xac
Aug 12 04:44:53 boke kernel: [ 64.779508]
print_address_description+0x65/0x22e
Aug 12 04:44:53 boke kernel: [ 64.779555] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779562] kasan_report_invalid_free+0x65/0xa0
Aug 12 04:44:53 boke kernel: [ 64.779609] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779614] __kasan_slab_free+0x157/0x170
Aug 12 04:44:53 boke kernel: [ 64.779661] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779666] kfree+0x90/0x1d0
Aug 12 04:44:53 boke kernel: [ 64.779712]
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779758]
iscsi_target_login_thread+0x10c4/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779769] ? __sched_text_start+0x8/0x8
Aug 12 04:44:53 boke kernel: [ 64.779812] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779819] ? __kthread_parkme+0xcc/0x100
Aug 12 04:44:53 boke kernel: [ 64.779826] ? parse_args.cold.14+0xd3/0xd3
Aug 12 04:44:53 boke kernel: [ 64.779870] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.779875] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.779882] ? kthread_bind+0x30/0x30
Aug 12 04:44:53 boke kernel: [ 64.779888] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.779892]
Aug 12 04:44:53 boke kernel: [ 64.782589] Allocated by task 992:
Aug 12 04:44:53 boke kernel: [ 64.785331] kasan_kmalloc+0xbf/0xe0
Aug 12 04:44:53 boke kernel: [ 64.785336] kmem_cache_alloc_trace+0x112/0x210
Aug 12 04:44:53 boke kernel: [ 64.785378]
iscsi_target_login_thread+0x844/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.785384] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.785388] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.785390]
Aug 12 04:44:53 boke kernel: [ 64.788089] Freed by task 992:
Aug 12 04:44:53 boke kernel: [ 64.790828] __kasan_slab_free+0x125/0x170
Aug 12 04:44:53 boke kernel: [ 64.790833] kfree+0x90/0x1d0
Aug 12 04:44:53 boke kernel: [ 64.790876]
iscsi_target_login_thread+0x15c7/0x1720 [iscsi_target_mod]
Aug 12 04:44:53 boke kernel: [ 64.790881] kthread+0x1a0/0x1c0
Aug 12 04:44:53 boke kernel: [ 64.790885] ret_from_fork+0x35/0x40
Aug 12 04:44:53 boke kernel: [ 64.790887]
Aug 12 04:44:53 boke kernel: [ 64.793592] The buggy address belongs to the
object at ffff880113ca6a00
Aug 12 04:44:53 boke kernel: [ 64.793592] which belongs to the cache
kmalloc-512 of size 512
Aug 12 04:44:53 boke kernel: [ 64.799193] The buggy address is located 0
bytes inside of
Aug 12 04:44:53 boke kernel: [ 64.799193] 512-byte region [ffff880113ca6a00,
ffff880113ca6c00)
Aug 12 04:44:53 boke kernel: [ 64.804771] The buggy address belongs to the
page:
Aug 12 04:44:53 boke kernel: [ 64.807550] page:ffffea00044f2980 count:1
mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
Aug 12 04:44:53 boke kernel: [ 64.813107] flags: 0x17fffc000008100(slab|head)
Aug 12 04:44:53 boke kernel: [ 64.815886] raw: 017fffc000008100
0000000000000000 0000000000000000 00000001000c000c
Aug 12 04:44:53 boke kernel: [ 64.818736] raw: dead000000000100
dead000000000200 ffff88011b002e00 0000000000000000
Aug 12 04:44:53 boke kernel: [ 64.821581] page dumped because: kasan: bad
access detected
Aug 12 04:44:53 boke kernel: [ 64.824383]
Aug 12 04:44:53 boke kernel: [ 64.827097] Memory state around the buggy
address:
Aug 12 04:44:53 boke kernel: [ 64.829886] ffff880113ca6900: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.832729] ffff880113ca6980: fc fc fc fc fc
fc fc fc fc fc fc fc fc fc fc fc
Aug 12 04:44:53 boke kernel: [ 64.835621] >ffff880113ca6a00: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.838559] ^
Aug 12 04:44:53 boke kernel: [ 64.841412] ffff880113ca6a80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.844354] ffff880113ca6b00: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:44:53 boke kernel: [ 64.847247]
==================================================================
Aug 12 04:45:28 boke kernel: [ 99.808033] iSCSI Login timeout on Network
Portal [::]:3260
Aug 12 04:45:28 boke kernel: [ 99.813911] iSCSI Login negotiation failed.
Aug 12 04:45:28 boke kernel: [ 99.819178]
==================================================================
Aug 12 04:45:28 boke kernel: [ 99.824242] BUG: KASAN: double-free or
invalid-free in iscsi_target_login_sess_out.cold.11+0x103/0x123
[iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.834681]
Aug 12 04:45:28 boke kernel: [ 99.839909] CPU: 1 PID: 992 Comm: iscsi_np
Tainted: G B O 4.17.8kasan #1
Aug 12 04:45:28 boke kernel: [ 99.839914] Hardware name: To be filled by
O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 05/19/2014
Aug 12 04:45:28 boke kernel: [ 99.839918] Call Trace:
Aug 12 04:45:28 boke kernel: [ 99.839937] dump_stack+0x71/0xac
Aug 12 04:45:28 boke kernel: [ 99.839952]
print_address_description+0x65/0x22e
Aug 12 04:45:28 boke kernel: [ 99.840033] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840045] kasan_report_invalid_free+0x65/0xa0
Aug 12 04:45:28 boke kernel: [ 99.840125] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840135] __kasan_slab_free+0x157/0x170
Aug 12 04:45:28 boke kernel: [ 99.840215] ?
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840223] kfree+0x90/0x1d0
Aug 12 04:45:28 boke kernel: [ 99.840303]
iscsi_target_login_sess_out.cold.11+0x103/0x123 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840382]
iscsi_target_login_thread+0x10c4/0x1720 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840398] ? __sched_text_start+0x8/0x8
Aug 12 04:45:28 boke kernel: [ 99.840474] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840485] ? __kthread_parkme+0xcc/0x100
Aug 12 04:45:28 boke kernel: [ 99.840496] ? parse_args.cold.14+0xd3/0xd3
Aug 12 04:45:28 boke kernel: [ 99.840572] ?
iscsi_target_login_sess_out+0x280/0x280 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.840581] kthread+0x1a0/0x1c0
Aug 12 04:45:28 boke kernel: [ 99.840593] ? kthread_bind+0x30/0x30
Aug 12 04:45:28 boke kernel: [ 99.840603] ret_from_fork+0x35/0x40
Aug 12 04:45:28 boke kernel: [ 99.840610]
Aug 12 04:45:28 boke kernel: [ 99.845766] Allocated by task 992:
Aug 12 04:45:28 boke kernel: [ 99.851007] kasan_kmalloc+0xbf/0xe0
Aug 12 04:45:28 boke kernel: [ 99.851016] kmem_cache_alloc_trace+0x112/0x210
Aug 12 04:45:28 boke kernel: [ 99.851090]
iscsi_target_login_thread+0x844/0x1720 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.851099] kthread+0x1a0/0x1c0
Aug 12 04:45:28 boke kernel: [ 99.851107] ret_from_fork+0x35/0x40
Aug 12 04:45:28 boke kernel: [ 99.851109]
Aug 12 04:45:28 boke kernel: [ 99.856286] Freed by task 992:
Aug 12 04:45:28 boke kernel: [ 99.861405] __kasan_slab_free+0x125/0x170
Aug 12 04:45:28 boke kernel: [ 99.861412] kfree+0x90/0x1d0
Aug 12 04:45:28 boke kernel: [ 99.861486]
iscsi_target_login_thread+0x15c7/0x1720 [iscsi_target_mod]
Aug 12 04:45:28 boke kernel: [ 99.861495] kthread+0x1a0/0x1c0
Aug 12 04:45:28 boke kernel: [ 99.861503] ret_from_fork+0x35/0x40
Aug 12 04:45:28 boke kernel: [ 99.861505]
Aug 12 04:45:28 boke kernel: [ 99.866456] The buggy address belongs to the
object at ffff880119ce4c80
Aug 12 04:45:28 boke kernel: [ 99.866456] which belongs to the cache
kmalloc-512 of size 512
Aug 12 04:45:28 boke kernel: [ 99.876739] The buggy address is located 0
bytes inside of
Aug 12 04:45:28 boke kernel: [ 99.876739] 512-byte region [ffff880119ce4c80,
ffff880119ce4e80)
Aug 12 04:45:28 boke kernel: [ 99.886859] The buggy address belongs to the
page:
Aug 12 04:45:28 boke kernel: [ 99.891718] page:ffffea0004673900 count:1
mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
Aug 12 04:45:28 boke kernel: [ 99.901751] flags: 0x17fffc000008100(slab|head)
Aug 12 04:45:28 boke kernel: [ 99.906847] raw: 017fffc000008100
0000000000000000 0000000000000000 00000001800c000c
Aug 12 04:45:28 boke kernel: [ 99.912053] raw: dead000000000100
dead000000000200 ffff88011b002e00 0000000000000000
Aug 12 04:45:28 boke kernel: [ 99.917221] page dumped because: kasan: bad
access detected
Aug 12 04:45:28 boke kernel: [ 99.922409]
Aug 12 04:45:28 boke kernel: [ 99.927394] Memory state around the buggy
address:
Aug 12 04:45:28 boke kernel: [ 99.932535] ffff880119ce4b80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:45:28 boke kernel: [ 99.937874] ffff880119ce4c00: fc fc fc fc fc
fc fc fc fc fc fc fc fc fc fc fc
Aug 12 04:45:28 boke kernel: [ 99.943113] >ffff880119ce4c80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:45:28 boke kernel: [ 99.948253] ^
Aug 12 04:45:28 boke kernel: [ 99.953425] ffff880119ce4d00: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:45:28 boke kernel: [ 99.958724] ffff880119ce4d80: fb fb fb fb fb
fb fb fb fb fb fb fb fb fb fb fb
Aug 12 04:45:28 boke kernel: [ 99.963801]
==================================================================
For completeness, I should mention this is with a vanilla kernel build
as of:
commit 5606f577a707aa4ccc391714dca815933aeba508 (HEAD, tag: v4.17.8)
Author: Greg Kroah-Hartman <[email protected]>
Date: Wed Jul 18 07:56:38 2018 +0200
Linux 4.17.8
which hence lacks any debian patch which would have been present in
the previous kernel.
I did build it with the debian-provided .config, enabling CONFIG_KASAN
and emptying CONFIG_SYSTEM_TRUSTED_KEYS. Post-menuconfig .config diff
against /boot/config-4.17.0-1-amd64:
40a41
> CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000
45a47
> CONFIG_CONSTRUCTORS=y
56c58
< CONFIG_LOCALVERSION=""
---
> CONFIG_LOCALVERSION="kasan"
58d59
< CONFIG_BUILD_SALT="4.17.0-1-amd64"
342d342
< CONFIG_VMAP_STACK=y
927d926
< CONFIG_X86_X32_DISABLED=y
5241a5241,5242
> # CONFIG_FB_NVIDIA is not set
> # CONFIG_FB_RIVA is not set
5854c5855
< CONFIG_USB_COMMON=m
---
> CONFIG_USB_COMMON=y
6767c6768
< CONFIG_ASHMEM=m
---
> # CONFIG_ASHMEM is not set
7370,7372c7371
< CONFIG_ANDROID_BINDER_IPC=m
< CONFIG_ANDROID_BINDER_DEVICES="binder"
< # CONFIG_ANDROID_BINDER_IPC_SELFTEST is not set
---
> # CONFIG_ANDROID_BINDER_IPC is not set
7860c7859,7863
< # CONFIG_KASAN is not set
---
> CONFIG_KASAN=y
> # CONFIG_KASAN_EXTRA is not set
> CONFIG_KASAN_OUTLINE=y
> # CONFIG_KASAN_INLINE is not set
> # CONFIG_TEST_KASAN is not set
8057d8059
< # CONFIG_UNWINDER_GUESS is not set
8070d8071
< CONFIG_SECURITY_PERF_EVENTS_RESTRICT=y
8086,8088d8086
< CONFIG_LOCK_DOWN_KERNEL=y
< # CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ is not set
< CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT=y
8330c8328
< CONFIG_SYSTEM_TRUSTED_KEYS="debian/certs/test-signing-certs.pem"
---
> CONFIG_SYSTEM_TRUSTED_KEYS=""
8456a8455
> CONFIG_STACKDEPOT=y
--
Vincent Pelletier
