[v6.1] KASAN: use-after-free Read in kernfs_add_one (2)
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syzbot
Apr 20, 2024, 12:04:26 AM (14 days ago) Apr 20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 6741e066ec76 Linux 6.1.87
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14e1c763180000
kernel config: https://syzkaller.appspot.com/x/.config?x=3fc2f61bd0ae457
dashboard link: https://syzkaller.appspot.com/bug?extid=52c455b925eb16d8864d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b606a22ddf4b/disk-6741e066.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e31c21737449/vmlinux-6741e066.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ee0cb8c049e9/bzImage-6741e066.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+52c455...@syzkaller.appspotmail.com
usb 1-1: Direct firmware load for ueagle-atm/adi930.fw failed with error -2
usb 1-1: Falling back to sysfs fallback for: ueagle-atm/adi930.fw
==================================================================
BUG: KASAN: use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:66 [inline]
BUG: KASAN: use-after-free in kernfs_next_descendant_post fs/kernfs/dir.c:1313 [inline]
BUG: KASAN: use-after-free in kernfs_activate fs/kernfs/dir.c:1368 [inline]
BUG: KASAN: use-after-free in kernfs_add_one+0x4ae/0x850 fs/kernfs/dir.c:800
Read of size 8 at addr ffff888016faf688 by task kworker/1:6/3636
CPU: 1 PID: 3636 Comm: kworker/1:6 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events request_firmware_work_func
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
kernfs_root fs/kernfs/kernfs-internal.h:66 [inline]
kernfs_next_descendant_post fs/kernfs/dir.c:1313 [inline]
kernfs_activate fs/kernfs/dir.c:1368 [inline]
kernfs_add_one+0x4ae/0x850 fs/kernfs/dir.c:800
kernfs_create_link+0x160/0x1f0 fs/kernfs/symlink.c:48
sysfs_do_create_link_sd+0x85/0x100 fs/sysfs/symlink.c:44
device_add_class_symlinks drivers/base/core.c:3415 [inline]
device_add+0x6b5/0xfd0 drivers/base/core.c:3634
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
firmware_fallback_sysfs+0x2fd/0x940 drivers/base/firmware_loader/fallback.c:234
_request_firmware+0xc13/0x1200 drivers/base/firmware_loader/main.c:856
request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1105
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Allocated by task 3636:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
__kernfs_new_node+0xd4/0x870 fs/kernfs/dir.c:608
kernfs_new_node+0x136/0x230 fs/kernfs/dir.c:684
kernfs_create_link+0xa1/0x1f0 fs/kernfs/symlink.c:39
sysfs_do_create_link_sd+0x85/0x100 fs/sysfs/symlink.c:44
device_add_class_symlinks drivers/base/core.c:3415 [inline]
device_add+0x6b5/0xfd0 drivers/base/core.c:3634
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
firmware_fallback_sysfs+0x2fd/0x940 drivers/base/firmware_loader/fallback.c:234
_request_firmware+0xc13/0x1200 drivers/base/firmware_loader/main.c:856
request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1105
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Freed by task 154:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
kmem_cache_free+0x292/0x510 mm/slub.c:3683
kernfs_put+0x325/0x4a0 fs/kernfs/dir.c:562
__kernfs_remove+0x5fc/0x710 fs/kernfs/dir.c:1467
kernfs_remove+0x76/0x90 fs/kernfs/dir.c:1487
__kobject_del+0xe2/0x310 lib/kobject.c:596
kobject_del+0x41/0x60 lib/kobject.c:619
device_del+0x9fe/0xbd0 drivers/base/core.c:3896
usb_disconnect+0x58f/0x8c0 drivers/usb/core/hub.c:2295
hub_port_connect drivers/usb/core/hub.c:5309 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5605 [inline]
port_event drivers/usb/core/hub.c:5761 [inline]
hub_event+0x1f78/0x5730 drivers/usb/core/hub.c:5843
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
process_scheduled_works kernel/workqueue.c:2355 [inline]
worker_thread+0xd04/0x1200 kernel/workqueue.c:2441
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff888016faf658
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 48 bytes inside of
168-byte region [ffff888016faf658, ffff888016faf700)
The buggy address belongs to the physical page:
page:ffffea00005bebc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16faf
flags: 0xfff80000000200(slab|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000000200 dead000000000100 dead000000000122 ffff888140009c80
raw: 0000000000000000 0000000080110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3805, tgid 3805 (syz-executor.4), ts 86653843181, free_ts 86555785473
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
prep_new_page mm/page_alloc.c:2520 [inline]
get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5547
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xc20/0x1270 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
__kernfs_new_node+0xd4/0x870 fs/kernfs/dir.c:608
kernfs_new_node+0x136/0x230 fs/kernfs/dir.c:684
__kernfs_create_file+0x45/0x2e0 fs/kernfs/file.c:1043
sysfs_add_file_mode_ns+0x246/0x300 fs/sysfs/file.c:294
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x545/0xed0 fs/sysfs/group.c:148
internal_create_groups fs/sysfs/group.c:188 [inline]
sysfs_create_groups+0x52/0x110 fs/sysfs/group.c:214
create_dir lib/kobject.c:68 [inline]
kobject_add_internal+0x725/0xd10 lib/kobject.c:231
kobject_add_varg lib/kobject.c:366 [inline]
kobject_init_and_add+0x120/0x190 lib/kobject.c:449
netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline]
netdev_queue_update_kobjects+0x1f2/0x480 net/core/net-sysfs.c:1718
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1440 [inline]
free_pcp_prepare mm/page_alloc.c:1490 [inline]
free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499
release_pages+0x2836/0x2b40 mm/swap.c:1055
__pagevec_release+0x80/0xf0 mm/swap.c:1075
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
truncate_inode_pages_range+0x48a/0x1340 mm/truncate.c:372
kill_bdev block/bdev.c:76 [inline]
blkdev_flush_mapping+0x154/0x2b0 block/bdev.c:664
blkdev_put_whole block/bdev.c:695 [inline]
blkdev_put+0x4c0/0x750 block/bdev.c:955
deactivate_locked_super+0xa0/0x110 fs/super.c:332
cleanup_mnt+0x490/0x520 fs/namespace.c:1186
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff888016faf580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888016faf600: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb
>ffff888016faf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888016faf700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff888016faf780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: 6741e066ec76 Linux 6.1.87
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14e1c763180000
kernel config: https://syzkaller.appspot.com/x/.config?x=3fc2f61bd0ae457
dashboard link: https://syzkaller.appspot.com/bug?extid=52c455b925eb16d8864d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b606a22ddf4b/disk-6741e066.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e31c21737449/vmlinux-6741e066.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ee0cb8c049e9/bzImage-6741e066.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+52c455...@syzkaller.appspotmail.com
usb 1-1: Direct firmware load for ueagle-atm/adi930.fw failed with error -2
usb 1-1: Falling back to sysfs fallback for: ueagle-atm/adi930.fw
==================================================================
BUG: KASAN: use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:66 [inline]
BUG: KASAN: use-after-free in kernfs_next_descendant_post fs/kernfs/dir.c:1313 [inline]
BUG: KASAN: use-after-free in kernfs_activate fs/kernfs/dir.c:1368 [inline]
BUG: KASAN: use-after-free in kernfs_add_one+0x4ae/0x850 fs/kernfs/dir.c:800
Read of size 8 at addr ffff888016faf688 by task kworker/1:6/3636
CPU: 1 PID: 3636 Comm: kworker/1:6 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events request_firmware_work_func
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
kernfs_root fs/kernfs/kernfs-internal.h:66 [inline]
kernfs_next_descendant_post fs/kernfs/dir.c:1313 [inline]
kernfs_activate fs/kernfs/dir.c:1368 [inline]
kernfs_add_one+0x4ae/0x850 fs/kernfs/dir.c:800
kernfs_create_link+0x160/0x1f0 fs/kernfs/symlink.c:48
sysfs_do_create_link_sd+0x85/0x100 fs/sysfs/symlink.c:44
device_add_class_symlinks drivers/base/core.c:3415 [inline]
device_add+0x6b5/0xfd0 drivers/base/core.c:3634
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
firmware_fallback_sysfs+0x2fd/0x940 drivers/base/firmware_loader/fallback.c:234
_request_firmware+0xc13/0x1200 drivers/base/firmware_loader/main.c:856
request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1105
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Allocated by task 3636:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
__kernfs_new_node+0xd4/0x870 fs/kernfs/dir.c:608
kernfs_new_node+0x136/0x230 fs/kernfs/dir.c:684
kernfs_create_link+0xa1/0x1f0 fs/kernfs/symlink.c:39
sysfs_do_create_link_sd+0x85/0x100 fs/sysfs/symlink.c:44
device_add_class_symlinks drivers/base/core.c:3415 [inline]
device_add+0x6b5/0xfd0 drivers/base/core.c:3634
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
firmware_fallback_sysfs+0x2fd/0x940 drivers/base/firmware_loader/fallback.c:234
_request_firmware+0xc13/0x1200 drivers/base/firmware_loader/main.c:856
request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1105
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Freed by task 154:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
kmem_cache_free+0x292/0x510 mm/slub.c:3683
kernfs_put+0x325/0x4a0 fs/kernfs/dir.c:562
__kernfs_remove+0x5fc/0x710 fs/kernfs/dir.c:1467
kernfs_remove+0x76/0x90 fs/kernfs/dir.c:1487
__kobject_del+0xe2/0x310 lib/kobject.c:596
kobject_del+0x41/0x60 lib/kobject.c:619
device_del+0x9fe/0xbd0 drivers/base/core.c:3896
usb_disconnect+0x58f/0x8c0 drivers/usb/core/hub.c:2295
hub_port_connect drivers/usb/core/hub.c:5309 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5605 [inline]
port_event drivers/usb/core/hub.c:5761 [inline]
hub_event+0x1f78/0x5730 drivers/usb/core/hub.c:5843
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
process_scheduled_works kernel/workqueue.c:2355 [inline]
worker_thread+0xd04/0x1200 kernel/workqueue.c:2441
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff888016faf658
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 48 bytes inside of
168-byte region [ffff888016faf658, ffff888016faf700)
The buggy address belongs to the physical page:
page:ffffea00005bebc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16faf
flags: 0xfff80000000200(slab|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000000200 dead000000000100 dead000000000122 ffff888140009c80
raw: 0000000000000000 0000000080110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3805, tgid 3805 (syz-executor.4), ts 86653843181, free_ts 86555785473
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
prep_new_page mm/page_alloc.c:2520 [inline]
get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5547
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xc20/0x1270 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
__kernfs_new_node+0xd4/0x870 fs/kernfs/dir.c:608
kernfs_new_node+0x136/0x230 fs/kernfs/dir.c:684
__kernfs_create_file+0x45/0x2e0 fs/kernfs/file.c:1043
sysfs_add_file_mode_ns+0x246/0x300 fs/sysfs/file.c:294
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x545/0xed0 fs/sysfs/group.c:148
internal_create_groups fs/sysfs/group.c:188 [inline]
sysfs_create_groups+0x52/0x110 fs/sysfs/group.c:214
create_dir lib/kobject.c:68 [inline]
kobject_add_internal+0x725/0xd10 lib/kobject.c:231
kobject_add_varg lib/kobject.c:366 [inline]
kobject_init_and_add+0x120/0x190 lib/kobject.c:449
netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline]
netdev_queue_update_kobjects+0x1f2/0x480 net/core/net-sysfs.c:1718
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1440 [inline]
free_pcp_prepare mm/page_alloc.c:1490 [inline]
free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499
release_pages+0x2836/0x2b40 mm/swap.c:1055
__pagevec_release+0x80/0xf0 mm/swap.c:1075
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
truncate_inode_pages_range+0x48a/0x1340 mm/truncate.c:372
kill_bdev block/bdev.c:76 [inline]
blkdev_flush_mapping+0x154/0x2b0 block/bdev.c:664
blkdev_put_whole block/bdev.c:695 [inline]
blkdev_put+0x4c0/0x750 block/bdev.c:955
deactivate_locked_super+0xa0/0x110 fs/super.c:332
cleanup_mnt+0x490/0x520 fs/namespace.c:1186
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff888016faf580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888016faf600: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb
>ffff888016faf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888016faf700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff888016faf780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
==================================================================
---
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