BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 6cc19067 P4D 6cc19067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.18.0-rc5-syzkaller #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:ffffc900001e0b00 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880239aaa88 RCX: 0000000000000000 RDX: 1ffff11004735552 RSI: ffff888019dfb000 RDI: ffff888078dc1800 RBP: ffff888078dc1800 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88807cda6138 R11: 0000000000000000 R12: ffff888019dfb000 R13: ffff888078dc1f58 R14: ffff888019dfb034 R15: ffff888078dc2156 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000006cc51000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __tcp_transmit_skb+0xf09/0x37d0 net/ipv4/tcp_output.c:1374 tcp_send_probe0+0x3d/0x4e0 net/ipv4/tcp_output.c:4080 tcp_probe_timer net/ipv4/tcp_timer.c:398 [inline] tcp_write_timer_handler+0x827/0x970 net/ipv4/tcp_timer.c:626 tcp_write_timer+0x79/0x1b0 net/ipv4/tcp_timer.c:642 call_timer_fn+0x163/0x4a0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x530/0x8e0 kernel/time/timer.c:1737 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1750 __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 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 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:111 [inline] RIP: 0010:acpi_idle_do_entry+0x15e/0x1c0 drivers/acpi/processor_idle.c:551 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 6a 48 8b 45 00 a8 08 75 c9 e8 bd 68 df f8 eb 07 0f 00 2d e4 a0 ba 00 fb f4 <9c> 58 fa f6 c4 02 74 b1 5d e9 94 67 df f8 48 89 ef 5d e9 ab f9 ff RSP: 0018:ffffc90000177d38 EFLAGS: 00000206 RAX: 0000000000059c1d RBX: ffff888015ae5865 RCX: 1ffffffff198eb79 RDX: 0000000000000000 RSI: ffffffff88eb90a0 RDI: ffffffff8942c6a0 RBP: ffff888010e29d40 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed10021c53a8 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888015ae5864 R14: ffffffff8b93a380 R15: ffff8880190f0004 acpi_idle_enter+0x2c0/0x4b0 drivers/acpi/processor_idle.c:686 cpuidle_enter_state+0x152/0xb40 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x45/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x3e8/0x590 kernel/sched/idle.c:303 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400 start_secondary+0x224/0x2c0 arch/x86/kernel/smpboot.c:266 secondary_startup_64_no_verify+0xc3/0xcb Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc900001e0b00 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880239aaa88 RCX: 0000000000000000 RDX: 1ffff11004735552 RSI: ffff888019dfb000 RDI: ffff888078dc1800 RBP: ffff888078dc1800 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88807cda6138 R11: 0000000000000000 R12: ffff888019dfb000 R13: ffff888078dc1f58 R14: ffff888019dfb034 R15: ffff888078dc2156 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000006cc51000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 fc add %bh,%ah 6: ff (bad) 7: df 48 c1 fisttps -0x3f(%rax) a: ea (bad) b: 03 80 3c 02 00 75 add 0x7500023c(%rax),%eax 11: 6a 48 pushq $0x48 13: 8b 45 00 mov 0x0(%rbp),%eax 16: a8 08 test $0x8,%al 18: 75 c9 jne 0xffffffe3 1a: e8 bd 68 df f8 callq 0xf8df68dc 1f: eb 07 jmp 0x28 21: 0f 00 2d e4 a0 ba 00 verw 0xbaa0e4(%rip) # 0xbaa10c 28: fb sti 29: f4 hlt * 2a: 9c pushfq <-- trapping instruction 2b: 58 pop %rax 2c: fa cli 2d: f6 c4 02 test $0x2,%ah 30: 74 b1 je 0xffffffe3 32: 5d pop %rbp 33: e9 94 67 df f8 jmpq 0xf8df67cc 38: 48 89 ef mov %rbp,%rdi 3b: 5d pop %rbp 3c: e9 .byte 0xe9 3d: ab stos %eax,%es:(%rdi) 3e: f9 stc 3f: ff .byte 0xff