BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1ebca0067 P4D 1ebca0067 PUD 1e59a5067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3003 Comm: syz-executor.3 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: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881e8a16e40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d55bb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb828
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d55bb1c0
FS:  00007f46c92746c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d64c1000 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:crypto_shash_update+0x22a/0x2a0 crypto/shash.c:133
Code: 80 ff 48 8b 74 24 10 48 01 de 8b 54 24 04 29 da 48 8b 7c 24 18 41 ff 14 24 41 89 c7 48 8b 5c 24 08 48 c7 44 24 20 0e 36 e0 45 <41> c7 44 1d 00 00 00 00 00 41 c7 44 1d 13 00 00 00 00 41 c6 44 1d
RSP: 0018:ffff8881e4477040 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 1ffff1103c88ee0c RCX: 0000000000040000
RDX: ffffc90000942000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff8881e4477170 R08: ffffffff823187bd R09: ffffffff84fa8eb0
R10: ffffffff84fa89a4 R11: ffffffff84fa8608 R12: ffffffff860566e8
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
 ext4_chksum fs/ext4/ext4.h:2145 [inline]
 ext4_inode_csum+0x30b/0xc80 fs/ext4/inode.c:64
 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_ext_truncate+0x85/0x180 fs/ext4/extents.c:4634
 ext4_truncate+0xb23/0x1290 fs/ext4/inode.c:4641
 ext4_setattr+0xeb5/0x1500 fs/ext4/inode.c:5857
 notify_change+0xc00/0xeb0 fs/attr.c:354
 do_truncate+0x1ed/0x2d0 fs/open.c:64
 handle_truncate fs/namei.c:3154 [inline]
 do_last fs/namei.c:3571 [inline]
 path_openat+0x2e0f/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: 0033:0x7f46c9ef9ea9
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:00007f46c92740c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f46ca030f80 RCX: 00007f46c9ef9ea9
RDX: 0000000000007a05 RSI: 00000000200003c0 RDI: ffffffffffffff9c
RBP: 00007f46c9f68ff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001700 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f46ca030f80 R15: 00007ffff67b0d78
Modules linked in:
CR2: 0000000000000000
---[ end trace 0b176633666e1e0e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881e8a16e40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881d55bb1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb828
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d55bb1c0
FS:  00007f46c92746c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d64c1000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	80 ff 48             	cmp    $0x48,%bh
   3:	8b 74 24 10          	mov    0x10(%rsp),%esi
   7:	48 01 de             	add    %rbx,%rsi
   a:	8b 54 24 04          	mov    0x4(%rsp),%edx
   e:	29 da                	sub    %ebx,%edx
  10:	48 8b 7c 24 18       	mov    0x18(%rsp),%rdi
  15:	41 ff 14 24          	call   *(%r12)
  19:	41 89 c7             	mov    %eax,%r15d
  1c:	48 8b 5c 24 08       	mov    0x8(%rsp),%rbx
  21:	48 c7 44 24 20 0e 36 	movq   $0x45e0360e,0x20(%rsp)
  28:	e0 45
* 2a:	41 c7 44 1d 00 00 00 	movl   $0x0,0x0(%r13,%rbx,1) <-- trapping instruction
  31:	00 00
  33:	41 c7 44 1d 13 00 00 	movl   $0x0,0x13(%r13,%rbx,1)
  3a:	00 00
  3c:	41                   	rex.B
  3d:	c6                   	.byte 0xc6
  3e:	44                   	rex.R
  3f:	1d                   	.byte 0x1d