==================================================================
BUG: KASAN: use-after-free in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: use-after-free in trace_page_fault_entries arch/x86/mm/fault.c:1516 [inline]
BUG: KASAN: use-after-free in do_page_fault+0x66/0x330 arch/x86/mm/fault.c:1528
Read of size 8 at addr ffff8881d65efe40 by task syz.5.482/2231

CPU: 1 PID: 2231 Comm: syz.5.482 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:

The buggy address belongs to the page:
page:ffffea0007597bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea00079b2b08 ffffea0007597b88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 __vmalloc_area_node mm/vmalloc.c:2431 [inline]
 __vmalloc_node_range+0x384/0x710 mm/vmalloc.c:2499
 vmalloc_user+0x70/0x80 mm/vmalloc.c:2629
 kcov_mmap+0x28/0x120 kernel/kcov.c:450
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x110d/0x16f0 mm/mmap.c:1812
 do_mmap+0x822/0xd30 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x1b5/0x260 mm/util.c:528
 ksys_mmap_pgoff+0x168/0x1e0 mm/mmap.c:1631
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 __vunmap+0x75b/0x890 mm/vmalloc.c:2260
 kcov_mmap+0x8c/0x120 kernel/kcov.c:474
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x110d/0x16f0 mm/mmap.c:1812
 do_mmap+0x822/0xd30 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x1b5/0x260 mm/util.c:528
 ksys_mmap_pgoff+0x168/0x1e0 mm/mmap.c:1631
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881d65efd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881d65efd80: ff ff ff ff ff ff ff ff 00 00 00 00 00 00 00 00
>ffff8881d65efe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff8881d65efe80: ff ff ff ff f1 f1 f1 f1 00 f2 f2 f2 04 f3 f3 f3
 ffff8881d65eff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
PANIC: double fault, error_code: 0x0
CPU: 1 PID: 2231 Comm: syz.5.482 Tainted: G    B             5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:check_preemption_disabled+0x69/0x320 lib/smp_processor_id.c:13
Code: c7 44 24 30 70 cc 31 82 4c 8d 6c 24 20 49 c1 ed 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 48 b9 00 00 00 00 00 fc ff df 49 89 44 0d 00 <e8> 22 7e 32 ff 65 8b 05 53 64 d0 7d 89 44 24 04 65 44 8b 35 9b c0
RSP: 0018:ffff8881d6256fe0 EFLAGS: 00010806
RAX: f3f3f300f1f1f1f1 RBX: ffffffff85eb6c58 RCX: dffffc0000000000
RDX: ffffc90007957000 RSI: ffffffff84fa5560 RDI: ffffffff84fa5520
RBP: ffff8881d6257090 R08: ffffffff8130280e R09: fffffbfff0c989a6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff84fa5520
R13: 1ffff1103ac4ae00 R14: ffff8881d6257100 R15: ffffffff84fa5560
FS:  00007fa86435f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881d6256fd8 CR3: 00000001f5c2a000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <#DF>
 </#DF>
----------------
Code disassembly (best guess):
   0:	c7 44 24 30 70 cc 31 	movl   $0x8231cc70,0x30(%rsp)
   7:	82
   8:	4c 8d 6c 24 20       	lea    0x20(%rsp),%r13
   d:	49 c1 ed 03          	shr    $0x3,%r13
  11:	48 b8 f1 f1 f1 f1 00 	movabs $0xf3f3f300f1f1f1f1,%rax
  18:	f3 f3 f3
  1b:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  22:	fc ff df
  25:	49 89 44 0d 00       	mov    %rax,0x0(%r13,%rcx,1)
* 2a:	e8 22 7e 32 ff       	call   0xff327e51 <-- trapping instruction
  2f:	65 8b 05 53 64 d0 7d 	mov    %gs:0x7dd06453(%rip),%eax        # 0x7dd06489
  36:	89 44 24 04          	mov    %eax,0x4(%rsp)
  3a:	65                   	gs
  3b:	44                   	rex.R
  3c:	8b                   	.byte 0x8b
  3d:	35                   	.byte 0x35
  3e:	9b                   	fwait
  3f:	c0                   	.byte 0xc0