BUG: spinlock recursion on CPU#0, syz.3.4/5323
==================================================================
BUG: KASAN: stack-out-of-bounds in cmp_ex_search+0x34/0xa0 lib/extable.c:94
Read of size 8 at addr ffffc900040061c0 by task syz.3.4/5323
CPU: 1 UID: 0 PID: 5323 Comm: syz.3.4 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
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
</TASK>
The buggy address belongs to stack of task syz.3.4/5323
and is located at offset 32 in frame:
__pv_queued_spin_lock_slowpath+0x0/0xdb0
This frame has 4 objects:
[32, 33) 'old.i249'
[48, 50) 'old.i.i'
[64, 65) 'old.i'
[80, 84) 'val.addr'
The buggy address belongs to the virtual mapping at
[ffffc90004000000, ffffc90004009000) created by:
copy_process+0x5d1/0x3d50 kernel/fork.c:2206
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802dfeeca8 pfn:0x2dfee
memcg:ffff888029a7c982
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88802dfeeca8 0000000000000000 00000001ffffffff ffff888029a7c982
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 35, tgid 35 (kworker/u8:2), ts 55686543585, free_ts 55582044020
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517
prep_new_page mm/page_alloc.c:1525 [inline]
get_page_from_freelist+0x3004/0x30c0 mm/page_alloc.c:3476
__alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
vm_area_alloc_pages mm/vmalloc.c:3600 [inline]
__vmalloc_area_node mm/vmalloc.c:3669 [inline]
__vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3850
alloc_thread_stack_node kernel/fork.c:314 [inline]
dup_task_struct+0x444/0x8c0 kernel/fork.c:1115
copy_process+0x5d1/0x3d50 kernel/fork.c:2206
kernel_clone+0x226/0x8f0 kernel/fork.c:2787
user_mode_thread+0x132/0x1a0 kernel/fork.c:2865
call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
call_usermodehelper_exec_work+0x9b/0x230 kernel/umh.c:164
process_one_work kernel/workqueue.c:3232 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313
worker_thread+0x86d/0xd10 kernel/workqueue.c:3390
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 5231 tgid 5231 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1098 [inline]
free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651
__slab_free+0x31b/0x3d0 mm/slub.c:4432
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4036 [inline]
slab_alloc_node mm/slub.c:4085 [inline]
kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4128
__alloc_skb+0x1c3/0x440 net/core/skbuff.c:667
netlink_sendmsg+0x638/0xcb0 net/netlink/af_netlink.c:1876
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
__sys_sendto+0x3a8/0x500 net/socket.c:2204
__do_sys_sendto net/socket.c:2216 [inline]
__se_sys_sendto net/socket.c:2212 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2212
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
Memory state around the buggy address:
ffffc90004006080: 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00
ffffc90004006100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90004006180: 00 00 00 00 f1 f1 f1 f1 01 f2 02 f2 01 f2 04 f3
^
ffffc90004006200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90004006280: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffffffff8e0382cc
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD e73a067 P4D e73a067 PUD e73b063 PMD 800000000e0001a1
Oops: Oops: 0011 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5323 Comm: syz.3.4 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:kallsyms_seqs_of_names+0x22bcf4/0x483ce0
Code: 38 20 31 31 20 66 6c 61 67 73 2e 69 2e 69 2e 69 20 36 34 20 31 30 34 20 31 20 6e 20 32 30 38 20 32 34 20 34 20 77 61 69 74 00 <32> 20 33 32 20 38 20 31 31 20 66 6c 61 67 73 2e 69 2e 69 2e 69 20
RSP: 0018:ffffc90004006070 EFLAGS: 00010046
RAX: a9be2c2e87185f00 RBX: ffffffff8140766a RCX: 0000000000040000
RDX: ffffc90004ca1000 RSI: 00000000000326fe RDI: 00000000000326ff
RBP: 0000000041b58ab3 R08: ffffffff81744bbc R09: 1ffff1101722519a
R10: dffffc0000000000 R11: ffffed101722519b R12: dffffc0000000000
R13: ffffc900040060a0 R14: 0000000304006110 R15: ffffffff9312a1a0
FS: 00007fa8ac6346c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8e0382cc CR3: 000000007a6b8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
</TASK>
Modules linked in:
CR2: ffffffff8e0382cc
---[ end trace 0000000000000000 ]---
RIP: 0010:kallsyms_seqs_of_names+0x22bcf4/0x483ce0
Code: 38 20 31 31 20 66 6c 61 67 73 2e 69 2e 69 2e 69 20 36 34 20 31 30 34 20 31 20 6e 20 32 30 38 20 32 34 20 34 20 77 61 69 74 00 <32> 20 33 32 20 38 20 31 31 20 66 6c 61 67 73 2e 69 2e 69 2e 69 20
RSP: 0018:ffffc90004006070 EFLAGS: 00010046
RAX: a9be2c2e87185f00 RBX: ffffffff8140766a RCX: 0000000000040000
RDX: ffffc90004ca1000 RSI: 00000000000326fe RDI: 00000000000326ff
RBP: 0000000041b58ab3 R08: ffffffff81744bbc R09: 1ffff1101722519a
R10: dffffc0000000000 R11: ffffed101722519b R12: dffffc0000000000
R13: ffffc900040060a0 R14: 0000000304006110 R15: ffffffff9312a1a0
FS: 00007fa8ac6346c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8e0382cc CR3: 000000007a6b8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400