BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1ddba2067 P4D 1ddba2067 PUD 1db0d2067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 126 Comm: jbd2/sda1-8 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:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881ee058000
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e3dbb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9f28
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3dbb1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e2e70000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x50 kernel/kcov.c:187
Code: a7 f1 85 e8 3f de 2f 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 04 24 65 48 8b 0d 54 51 9e 7e 65 8b 15 59 51 9e 7e <f7> c2 00 01 1f 00 74 01 c3 8b 91 00 0a 00 00 83 fa 02 75 f4 48 8b
RSP: 0018:ffff8881ee08f530 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffffffff823183e8 RBX: ffff8881d8d92ec0 RCX: ffff8881ee058000
RDX: 0000000080000000 RSI: 00000000000001d8 RDI: ffff8881d8d92ec4
RBP: 00000000000001d8 R08: ffff8881d8d92ec0 R09: ffffffff84fa8c04
R10: ffffffff84fa8870 R11: ffffffff84fa84d4 R12: ffffffff84fa7000
R13: ffffffff84fa7800 R14: 00000000b4867e80 R15: ffffffff84fa7400
 crc32_body lib/crc32.c:102 [inline]
 crc32_le_generic lib/crc32.c:179 [inline]
 __crc32c_le_base+0x208/0xd20 lib/crc32.c:202
 chksum_update+0x42/0x90 crypto/crc32c_generic.c:90
 crypto_shash_update+0x1db/0x2a0 crypto/shash.c:132
 jbd2_chksum include/linux/jbd2.h:1628 [inline]
 jbd2_descriptor_block_csum_set+0x342/0x5e0 fs/jbd2/journal.c:872
 jbd2_journal_commit_transaction+0x26ac/0x6720 fs/jbd2/commit.c:712
 kjournald2+0x486/0x880 fs/jbd2/journal.c:209
 kthread+0x2da/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
CR2: 0000000000000000
---[ end trace 5942d525da2f411c ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010206
RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881ee058000
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e3dbb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9f28
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3dbb1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e2e70000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e8 3f de 2f 00       	call   0x2fde44
   5:	c3                   	ret
   6:	90                   	nop
   7:	90                   	nop
   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:	48 8b 04 24          	mov    (%rsp),%rax
  18:	65 48 8b 0d 54 51 9e 	mov    %gs:0x7e9e5154(%rip),%rcx        # 0x7e9e5174
  1f:	7e
  20:	65 8b 15 59 51 9e 7e 	mov    %gs:0x7e9e5159(%rip),%edx        # 0x7e9e5180
* 27:	f7 c2 00 01 1f 00    	test   $0x1f0100,%edx <-- trapping instruction
  2d:	74 01                	je     0x30
  2f:	c3                   	ret
  30:	8b 91 00 0a 00 00    	mov    0xa00(%rcx),%edx
  36:	83 fa 02             	cmp    $0x2,%edx
  39:	75 f4                	jne    0x2f
  3b:	48                   	rex.W
  3c:	8b                   	.byte 0x8b