==================================================================
BUG: KASAN: stack-out-of-bounds in fixup_exception+0xa7/0x1cc0 arch/x86/mm/extable.c:320
Read of size 8 at addr ffffc900047f7018 by task syz.1.40/5477

CPU: 0 UID: 0 PID: 5477 Comm: syz.1.40 Not tainted 6.11.0-rc4-next-20240821-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.1.40/5477
internal error: frame has invalid marker: 1

The buggy address belongs to the virtual mapping at
 [ffffc900047f0000, ffffc900047f9000) 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:0xffff88802a74fb40 pfn:0x2a74f
memcg:ffff8880299fb482
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88802a74fb40 0000000000000000 00000001ffffffff ffff8880299fb482
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 5465, tgid 5465 (syz.3.36), ts 81069107373, free_ts 80928324402
 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
 __do_sys_clone3 kernel/fork.c:3091 [inline]
 __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070
 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
page last free pid 5462 tgid 5459 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1098 [inline]
 free_unref_folios+0xe8a/0x1850 mm/page_alloc.c:2699
 folios_put_refs+0x76e/0x860 mm/swap.c:1007
 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465
 exit_mmap+0x496/0xc40 mm/mmap.c:1934
 __mmput+0x115/0x390 kernel/fork.c:1347
 exit_mm+0x220/0x310 kernel/exit.c:571
 do_exit+0x9b2/0x28e0 kernel/exit.c:926
 do_group_exit+0x207/0x2c0 kernel/exit.c:1088
 get_signal+0x176f/0x1810 kernel/signal.c:2936
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffffc900047f6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900047f6f80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f3
>ffffc900047f7000: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffffc900047f7080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900047f7100: f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: fffff520008fedbb
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD 23ffed067 P4D 23ffed067 PUD 166df067 PMD 200cc067 PTE 8000000079697063
Oops: Oops: 0011 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 5477 Comm: syz.1.40 Tainted: G    B              6.11.0-rc4-next-20240821-syzkaller #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:0xfffff520008fedbb
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 00 f3 <f2> f2 f2 f2 f2 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900047f6ce0 EFLAGS: 00010082
RAX: ffff8880222c5a01 RBX: 0000000000000000 RCX: ffff8880222c5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000001 R08: ffffffff8155a2df R09: 1ffffffff2632014
R10: dffffc0000000000 R11: fffffbfff2632015 R12: 0000000000000000
R13: 1ffff920008fedb8 R14: dffffc0000000000 R15: dffffc0000000000
FS:  0000555594647500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff520008fedbb CR3: 000000001fc36000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 </TASK>
Modules linked in:
CR2: fffff520008fedbb
---[ end trace 0000000000000000 ]---
RIP: 0010:0xfffff520008fedbb
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 00 f3 <f2> f2 f2 f2 f2 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900047f6ce0 EFLAGS: 00010082
RAX: ffff8880222c5a01 RBX: 0000000000000000 RCX: ffff8880222c5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000001 R08: ffffffff8155a2df R09: 1ffffffff2632014
R10: dffffc0000000000 R11: fffffbfff2632015 R12: 0000000000000000
R13: 1ffff920008fedb8 R14: dffffc0000000000 R15: dffffc0000000000
FS:  0000555594647500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff520008fedbb CR3: 000000001fc36000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400