BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 7cca7067 P4D 7cca7067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc8-syzkaller-02803-g36c2e31ad25b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900001d0a60 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88806760d850 RCX: 0000000000000100
RDX: 1ffff1100cec1b0b RSI: ffff88807c936000 RDI: ffff88802304bc00
RBP: ffff88802304bc00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87bccdc7 R11: 0000000000000000 R12: ffff88807c936000
R13: 0000000000000000 R14: ffff88802304c360 R15: ffff888076e9312c
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000539ef000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __tcp_transmit_skb+0x1098/0x38b0 net/ipv4/tcp_output.c:1371
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_xmit_probe_skb+0x28c/0x320 net/ipv4/tcp_output.c:4006
 tcp_write_wakeup+0x1bd/0x610 net/ipv4/tcp_output.c:4059
 tcp_send_probe0+0x44/0x560 net/ipv4/tcp_output.c:4074
 tcp_probe_timer net/ipv4/tcp_timer.c:398 [inline]
 tcp_write_timer_handler+0x9ed/0xbc0 net/ipv4/tcp_timer.c:626
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:116 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
Code: 89 de e8 dd 07 23 f8 84 db 75 ac e8 54 05 23 f8 e8 2f 43 29 f8 eb 0c e8 48 05 23 f8 0f 00 2d d1 06 bc 00 e8 3c 05 23 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 17 09 23 f8 48 85 db
RSP: 0018:ffffc90000167d18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888010fa8000 RSI: ffffffff8955bc94 RDI: 0000000000000000
RBP: ffff888144581864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817effe8 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888144581800 R14: ffff888144581864 R15: ffff888017b37004
 acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:692
 cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:306
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
 start_secondary+0x265/0x340 arch/x86/kernel/smpboot.c:272
 secondary_startup_64_no_verify+0xc3/0xcb
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900001d0a60 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88806760d850 RCX: 0000000000000100
RDX: 1ffff1100cec1b0b RSI: ffff88807c936000 RDI: ffff88802304bc00
RBP: ffff88802304bc00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87bccdc7 R11: 0000000000000000 R12: ffff88807c936000
R13: 0000000000000000 R14: ffff88802304c360 R15: ffff888076e9312c
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000539ef000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 de                	mov    %ebx,%esi
   2:	e8 dd 07 23 f8       	callq  0xf82307e4
   7:	84 db                	test   %bl,%bl
   9:	75 ac                	jne    0xffffffb7
   b:	e8 54 05 23 f8       	callq  0xf8230564
  10:	e8 2f 43 29 f8       	callq  0xf8294344
  15:	eb 0c                	jmp    0x23
  17:	e8 48 05 23 f8       	callq  0xf8230564
  1c:	0f 00 2d d1 06 bc 00 	verw   0xbc06d1(%rip)        # 0xbc06f4
  23:	e8 3c 05 23 f8       	callq  0xf8230564
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	9c                   	pushfq <-- trapping instruction
  2b:	5b                   	pop    %rbx
  2c:	81 e3 00 02 00 00    	and    $0x200,%ebx
  32:	fa                   	cli
  33:	31 ff                	xor    %edi,%edi
  35:	48 89 de             	mov    %rbx,%rsi
  38:	e8 17 09 23 f8       	callq  0xf8230954
  3d:	48 85 db             	test   %rbx,%rbx