Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 16267 Comm: syz.4.2346 Not tainted 6.13.0-rc2-syzkaller-00292-ga446e965a188 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:account_kernel_stack+0xe6/0x2e0 kernel/fork.c:546
Code: fb 08 0f 84 a1 01 00 00 e8 27 37 40 00 48 8b 44 24 08 80 38 00 0f 85 bf 01 00 00 49 8b 47 20 48 8d 2c d8 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 be 01 00 00 48 8b 6d 00 48 8d 7d 08 48 89 f8
RSP: 0018:ffffc9000c177b88 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802f510000 RSI: ffffffff815906c9 RDI: ffff88802f5117e0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ea2138
R10: ffff88802f5109c3 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 1ffff11004c1f194 R15: ffff8880260f8c80
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ab634c560 CR3: 000000007e3d8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 exit_task_stack_account+0x23/0xf0 kernel/fork.c:559
 do_exit+0x1c8a/0x2d70 kernel/exit.c:979
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x2576/0x2610 kernel/signal.c:3017
 arch_do_signal_or_restart+0x90/0x7e0 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:329 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x401000
Code: Unable to access opcode bytes at 0x400fd6.
RSP: 002b:000000000000000b EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007fbdb6376080 RCX: 00007fbdb6185d19
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000001
RBP: 00007fbdb6201a20 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbdb6376080 R15: 00007ffd688180c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:account_kernel_stack+0xe6/0x2e0 kernel/fork.c:546
Code: fb 08 0f 84 a1 01 00 00 e8 27 37 40 00 48 8b 44 24 08 80 38 00 0f 85 bf 01 00 00 49 8b 47 20 48 8d 2c d8 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 be 01 00 00 48 8b 6d 00 48 8d 7d 08 48 89 f8
RSP: 0018:ffffc9000c177b88 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802f510000 RSI: ffffffff815906c9 RDI: ffff88802f5117e0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ea2138
R10: ffff88802f5109c3 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 1ffff11004c1f194 R15: ffff8880260f8c80
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe09ff8 CR3: 000000002fe1a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	0f 84 a1 01 00 00    	je     0x1a7
   6:	e8 27 37 40 00       	call   0x403732
   b:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
  10:	80 38 00             	cmpb   $0x0,(%rax)
  13:	0f 85 bf 01 00 00    	jne    0x1d8
  19:	49 8b 47 20          	mov    0x20(%r15),%rax
  1d:	48 8d 2c d8          	lea    (%rax,%rbx,8),%rbp
  21:	48 89 e8             	mov    %rbp,%rax
  24:	48 c1 e8 03          	shr    $0x3,%rax
* 28:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2d:	0f 85 be 01 00 00    	jne    0x1f1
  33:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
  37:	48 8d 7d 08          	lea    0x8(%rbp),%rdi
  3b:	48 89 f8             	mov    %rdi,%rax