BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1eb633067 P4D 1eb633067 PUD 1f0f94067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1698 Comm: syz-executor.2 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881e7b62f40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ef0331c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffac08
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ef0331c0
FS:  00007fc0e56ba6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ebc79000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:538 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:crc32_body lib/crc32.c:112 [inline]
RIP: 0010:crc32_le_generic lib/crc32.c:179 [inline]
RIP: 0010:__crc32c_le_base+0x1d8/0xd20 lib/crc32.c:202
Code: 10 84 c0 0f 85 8c 02 00 00 c1 eb 18 4c 8d 24 9d 00 70 fa 84 4c 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 c2 02 00 00 41 8b 19 <41> 33 1a 41 33 1b 41 33 1e 33 5d 00 41 33 5d 00 41 33 1f 41 33 1c
RSP: 0018:ffff8881e635f038 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00000000211d826d RCX: 0000000000040000
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff8881d425c114
RBP: ffffffff84fa7c00 R08: ffff8881d425c110 R09: ffffffff84fa8c10
R10: ffffffff84fa8a28 R11: ffffffff84fa844c R12: ffffffff84fa7000
R13: ffffffff84fa7800 R14: ffffffff84fa82d0 R15: ffffffff84fa7400
 chksum_update+0x42/0x90 crypto/crc32c_generic.c:90
 crypto_shash_update+0x1db/0x2a0 crypto/shash.c:132
 ext4_chksum fs/ext4/ext4.h:2145 [inline]
 ext4_inode_csum+0x213/0xc80 fs/ext4/inode.c:63
 ext4_inode_csum_set fs/ext4/inode.c:117 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5511 [inline]
 ext4_mark_iloc_dirty+0x1ea6/0x3560 fs/ext4/inode.c:6071
 ext4_mark_inode_dirty+0x4e7/0x7a0 fs/ext4/inode.c:6273
 __ext4_new_inode+0x3145/0x3f10 fs/ext4/ialloc.c:1186
 ext4_create+0x255/0x5b0 fs/ext4/namei.c:2750
 lookup_open fs/namei.c:3379 [inline]
 do_last fs/namei.c:3471 [inline]
 path_openat+0x184a/0x34b0 fs/namei.c:3683
 do_filp_open+0x20b/0x450 fs/namei.c:3713
 do_sys_open+0x39c/0x810 fs/open.c:1123
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fc0e633ff29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc0e56ba0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc0e6476f80 RCX: 00007fc0e633ff29
RDX: 00000000000026e1 RSI: 0000000020000340 RDI: ffffffffffffff9c
RBP: 00007fc0e63af074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fc0e6476f80 R15: 00007ffe15039ec8
Modules linked in:
CR2: 0000000000000000
---[ end trace a814c067f3a4dd03 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881e7b62f40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ef0331c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffac08
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ef0331c0
FS:  00007fc0e56ba6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ebc79000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	10 84 c0 0f 85 8c 02 	adc    %al,0x28c850f(%rax,%rax,8)
   7:	00 00                	add    %al,(%rax)
   9:	c1 eb 18             	shr    $0x18,%ebx
   c:	4c 8d 24 9d 00 70 fa 	lea    -0x7b059000(,%rbx,4),%r12
  13:	84
  14:	4c 89 e0             	mov    %r12,%rax
  17:	48 c1 e8 03          	shr    $0x3,%rax
  1b:	0f b6 04 10          	movzbl (%rax,%rdx,1),%eax
  1f:	84 c0                	test   %al,%al
  21:	0f 85 c2 02 00 00    	jne    0x2e9
  27:	41 8b 19             	mov    (%r9),%ebx
* 2a:	41 33 1a             	xor    (%r10),%ebx <-- trapping instruction
  2d:	41 33 1b             	xor    (%r11),%ebx
  30:	41 33 1e             	xor    (%r14),%ebx
  33:	33 5d 00             	xor    0x0(%rbp),%ebx
  36:	41 33 5d 00          	xor    0x0(%r13),%ebx
  3a:	41 33 1f             	xor    (%r15),%ebx
  3d:	41                   	rex.B
  3e:	33                   	.byte 0x33
  3f:	1c                   	.byte 0x1c