[syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in sk_filter_trim_cap
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syzbot
Sep 4, 2024, 8:35:23 AMSep 4
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Hello,
syzbot found the following issue on:
HEAD commit: 33f339a1ba54 bpf, net: Fix a potential race in do_sock_get..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=13f046fb980000
kernel config: https://syzkaller.appspot.com/x/.config?x=996585887acdadb3
dashboard link: https://syzkaller.appspot.com/bug?extid=b4bc25bfaad44df51f05
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/05db6c7e2db6/disk-33f339a1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/236ebb3d5e01/vmlinux-33f339a1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/97dd5f4e883e/bzImage-33f339a1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b4bc25...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in sk_filter_trim_cap+0x270/0xa80 net/core/filter.c:155
Read of size 8 at addr ffff888062a0a178 by task syz.3.1323/10208
CPU: 0 UID: 0 PID: 10208 Comm: syz.3.1323 Not tainted 6.11.0-rc5-syzkaller-00191-g33f339a1ba54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
sk_filter_trim_cap+0x270/0xa80 net/core/filter.c:155
sk_filter include/linux/filter.h:1052 [inline]
sock_queue_rcv_skb_reason+0x28/0xf0 net/core/sock.c:521
sock_queue_rcv_skb include/net/sock.h:2376 [inline]
mgmt_cmd_status+0x28d/0x4d0 net/bluetooth/mgmt_util.c:156
cmd_status_rsp net/bluetooth/mgmt.c:1450 [inline]
cmd_complete_rsp+0xe7/0x150 net/bluetooth/mgmt.c:1465
mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
__mgmt_power_off+0x187/0x420 net/bluetooth/mgmt.c:9469
hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191
hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
sock_do_ioctl+0x158/0x460 net/socket.c:1222
sock_ioctl+0x629/0x8e0 net/socket.c:1341
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ef0d7cef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4ef1b48038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ef0f35f80 RCX: 00007f4ef0d7cef9
RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000005
RBP: 00007f4ef0def01e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4ef0f35f80 R15: 00007ffef1e33f48
</TASK>
Allocated by task 6202:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4158 [inline]
__kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170
kmalloc_noprof include/linux/slab.h:685 [inline]
sk_prot_alloc+0xe0/0x210 net/core/sock.c:2096
sk_alloc+0x38/0x370 net/core/sock.c:2149
bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148
hci_sock_create+0xa1/0x190 net/bluetooth/hci_sock.c:2202
bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132
__sock_create+0x490/0x920 net/socket.c:1571
sock_create net/socket.c:1622 [inline]
__sys_socket_create net/socket.c:1659 [inline]
__sys_socket+0x150/0x3c0 net/socket.c:1706
__do_sys_socket net/socket.c:1720 [inline]
__se_sys_socket net/socket.c:1718 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1718
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10210:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2252 [inline]
slab_free mm/slub.c:4473 [inline]
kfree+0x149/0x360 mm/slub.c:4594
sk_prot_free net/core/sock.c:2132 [inline]
__sk_destruct+0x479/0x5f0 net/core/sock.c:2224
sock_put include/net/sock.h:1884 [inline]
mgmt_pending_free net/bluetooth/mgmt_util.c:307 [inline]
mgmt_pending_remove+0x13e/0x1a0 net/bluetooth/mgmt_util.c:315
mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
mgmt_index_removed+0xe6/0x340 net/bluetooth/mgmt.c:9402
hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
__sys_bind_socket net/socket.c:1833 [inline]
__sys_bind+0x23d/0x2f0 net/socket.c:1857
__do_sys_bind net/socket.c:1865 [inline]
__se_sys_bind net/socket.c:1863 [inline]
__x64_sys_bind+0x7a/0x90 net/socket.c:1863
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888062a0a000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 376 bytes inside of
freed 2048-byte region [ffff888062a0a000, ffff888062a0a800)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62a08
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac42000 ffffea0000a95600 dead000000000002
raw: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac42000 ffffea0000a95600 dead000000000002
head: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 00fff00000000003 ffffea00018a8201 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5235, tgid 5235 (syz-executor), ts 58768438859, free_ts 15148990809
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
prep_new_page mm/page_alloc.c:1501 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2321
allocate_slab+0x5a/0x2f0 mm/slub.c:2484
new_slab mm/slub.c:2537 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
__slab_alloc+0x58/0xa0 mm/slub.c:3813
__slab_alloc_node mm/slub.c:3866 [inline]
slab_alloc_node mm/slub.c:4025 [inline]
__do_kmalloc_node mm/slub.c:4157 [inline]
__kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4177
kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:605
__alloc_skb+0x1f3/0x440 net/core/skbuff.c:674
alloc_skb include/linux/skbuff.h:1320 [inline]
nlmsg_new include/net/netlink.h:1015 [inline]
inet6_ifinfo_notify+0x72/0x120 net/ipv6/addrconf.c:6162
addrconf_notify+0xc6b/0x1020 net/ipv6/addrconf.c:3763
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
__dev_notify_flags+0x207/0x400
dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612
free_contig_range+0x9e/0x160 mm/page_alloc.c:6660
destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x248/0x880 init/main.c:1267
do_initcall_level+0x157/0x210 init/main.c:1329
do_initcalls+0x3f/0x80 init/main.c:1345
kernel_init_freeable+0x435/0x5d0 init/main.c:1578
kernel_init+0x1d/0x2b0 init/main.c:1467
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Memory state around the buggy address:
ffff888062a0a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888062a0a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888062a0a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888062a0a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888062a0a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 33f339a1ba54 bpf, net: Fix a potential race in do_sock_get..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=13f046fb980000
kernel config: https://syzkaller.appspot.com/x/.config?x=996585887acdadb3
dashboard link: https://syzkaller.appspot.com/bug?extid=b4bc25bfaad44df51f05
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/05db6c7e2db6/disk-33f339a1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/236ebb3d5e01/vmlinux-33f339a1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/97dd5f4e883e/bzImage-33f339a1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b4bc25...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in sk_filter_trim_cap+0x270/0xa80 net/core/filter.c:155
Read of size 8 at addr ffff888062a0a178 by task syz.3.1323/10208
CPU: 0 UID: 0 PID: 10208 Comm: syz.3.1323 Not tainted 6.11.0-rc5-syzkaller-00191-g33f339a1ba54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
sk_filter_trim_cap+0x270/0xa80 net/core/filter.c:155
sk_filter include/linux/filter.h:1052 [inline]
sock_queue_rcv_skb_reason+0x28/0xf0 net/core/sock.c:521
sock_queue_rcv_skb include/net/sock.h:2376 [inline]
mgmt_cmd_status+0x28d/0x4d0 net/bluetooth/mgmt_util.c:156
cmd_status_rsp net/bluetooth/mgmt.c:1450 [inline]
cmd_complete_rsp+0xe7/0x150 net/bluetooth/mgmt.c:1465
mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
__mgmt_power_off+0x187/0x420 net/bluetooth/mgmt.c:9469
hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191
hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
sock_do_ioctl+0x158/0x460 net/socket.c:1222
sock_ioctl+0x629/0x8e0 net/socket.c:1341
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ef0d7cef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4ef1b48038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ef0f35f80 RCX: 00007f4ef0d7cef9
RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000005
RBP: 00007f4ef0def01e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4ef0f35f80 R15: 00007ffef1e33f48
</TASK>
Allocated by task 6202:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4158 [inline]
__kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170
kmalloc_noprof include/linux/slab.h:685 [inline]
sk_prot_alloc+0xe0/0x210 net/core/sock.c:2096
sk_alloc+0x38/0x370 net/core/sock.c:2149
bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148
hci_sock_create+0xa1/0x190 net/bluetooth/hci_sock.c:2202
bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132
__sock_create+0x490/0x920 net/socket.c:1571
sock_create net/socket.c:1622 [inline]
__sys_socket_create net/socket.c:1659 [inline]
__sys_socket+0x150/0x3c0 net/socket.c:1706
__do_sys_socket net/socket.c:1720 [inline]
__se_sys_socket net/socket.c:1718 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1718
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10210:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2252 [inline]
slab_free mm/slub.c:4473 [inline]
kfree+0x149/0x360 mm/slub.c:4594
sk_prot_free net/core/sock.c:2132 [inline]
__sk_destruct+0x479/0x5f0 net/core/sock.c:2224
sock_put include/net/sock.h:1884 [inline]
mgmt_pending_free net/bluetooth/mgmt_util.c:307 [inline]
mgmt_pending_remove+0x13e/0x1a0 net/bluetooth/mgmt_util.c:315
mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
mgmt_index_removed+0xe6/0x340 net/bluetooth/mgmt.c:9402
hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
__sys_bind_socket net/socket.c:1833 [inline]
__sys_bind+0x23d/0x2f0 net/socket.c:1857
__do_sys_bind net/socket.c:1865 [inline]
__se_sys_bind net/socket.c:1863 [inline]
__x64_sys_bind+0x7a/0x90 net/socket.c:1863
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888062a0a000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 376 bytes inside of
freed 2048-byte region [ffff888062a0a000, ffff888062a0a800)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62a08
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac42000 ffffea0000a95600 dead000000000002
raw: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac42000 ffffea0000a95600 dead000000000002
head: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000
head: 00fff00000000003 ffffea00018a8201 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5235, tgid 5235 (syz-executor), ts 58768438859, free_ts 15148990809
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
prep_new_page mm/page_alloc.c:1501 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2321
allocate_slab+0x5a/0x2f0 mm/slub.c:2484
new_slab mm/slub.c:2537 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
__slab_alloc+0x58/0xa0 mm/slub.c:3813
__slab_alloc_node mm/slub.c:3866 [inline]
slab_alloc_node mm/slub.c:4025 [inline]
__do_kmalloc_node mm/slub.c:4157 [inline]
__kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4177
kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:605
__alloc_skb+0x1f3/0x440 net/core/skbuff.c:674
alloc_skb include/linux/skbuff.h:1320 [inline]
nlmsg_new include/net/netlink.h:1015 [inline]
inet6_ifinfo_notify+0x72/0x120 net/ipv6/addrconf.c:6162
addrconf_notify+0xc6b/0x1020 net/ipv6/addrconf.c:3763
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
__dev_notify_flags+0x207/0x400
dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612
free_contig_range+0x9e/0x160 mm/page_alloc.c:6660
destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x248/0x880 init/main.c:1267
do_initcall_level+0x157/0x210 init/main.c:1329
do_initcalls+0x3f/0x80 init/main.c:1345
kernel_init_freeable+0x435/0x5d0 init/main.c:1578
kernel_init+0x1d/0x2b0 init/main.c:1467
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Memory state around the buggy address:
ffff888062a0a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888062a0a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888062a0a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888062a0a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888062a0a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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