Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 UID: 0 PID: 12085 Comm: syz.5.1798 Not tainted 6.16.0-syzkaller-11129-geacf91b0c78a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc9001ab6ef38 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8b79f27e RCX: 980daf9aaeecc300
RDX: 0000000000000000 RSI: ffffffff8b79f27e RDI: 0000000000000003
RBP: ffffffff820fd25e R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: ffffffff82197aa0 R12: 0000000000000000
R13: 0000000000000018 R14: 0000000000000018 R15: 0000000000000001
FS:  00007fd682d7e6c0(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d1998 CR3: 0000000063f78000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40 mm/kasan/common.c:556
 kasan_check_byte include/linux/kasan.h:399 [inline]
 lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 __pte_offset_map_lock+0x13e/0x210 mm/pgtable-generic.c:401
 pte_offset_map_lock include/linux/mm.h:3027 [inline]
 madvise_free_pte_range+0x203/0x1870 mm/madvise.c:675
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:224 [inline]
 walk_p4d_range mm/pagewalk.c:262 [inline]
 walk_pgd_range+0xfe9/0x1d40 mm/pagewalk.c:303
 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410
 walk_page_range_vma+0x393/0x440 mm/pagewalk.c:705
 madvise_free_single_vma mm/madvise.c:833 [inline]
 madvise_dontneed_free mm/madvise.c:962 [inline]
 madvise_vma_behavior+0x32d4/0x3850 mm/madvise.c:1287
 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1600
 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1816
 do_madvise+0x1bc/0x270 mm/madvise.c:1909
 __do_sys_madvise mm/madvise.c:1918 [inline]
 __se_sys_madvise mm/madvise.c:1916 [inline]
 __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1916
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd681f8eb69
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:00007fd682d7e038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fd6821b6240 RCX: 00007fd681f8eb69
RDX: 0000000000000008 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007fd682011df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd6821b6240 R15: 00007fd6822dfa28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc9001ab6ef38 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8b79f27e RCX: 980daf9aaeecc300
RDX: 0000000000000000 RSI: ffffffff8b79f27e RDI: 0000000000000003
RBP: ffffffff820fd25e R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: ffffffff82197aa0 R12: 0000000000000000
R13: 0000000000000018 R14: 0000000000000018 R15: 0000000000000001
FS:  00007fd682d7e6c0(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d1998 CR3: 0000000063f78000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	66 0f 1f 00          	nopw   (%rax)
  1c:	48 c1 ef 03          	shr    $0x3,%rdi
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 07          	movzbl (%rdi,%rax,1),%eax <-- trapping instruction
  2e:	3c 08                	cmp    $0x8,%al
  30:	0f 92 c0             	setb   %al
  33:	c3                   	ret
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	cc                   	int3
  38:	cc                   	int3
  39:	66                   	data16
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	66                   	data16
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs