BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1dd36f067 P4D 1dd36f067 PUD 1f36f1067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 2385 Comm: syz-executor.1 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: 00010206 RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881efbe0fc0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d4f871c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa690 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d4f871c0 FS: 00007f9d6ebfd6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001ca46a000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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 RIP: 0010:tipc_sendstream net/tipc/socket.c:1451 [inline] RIP: 0010:tipc_send_packet+0x7a/0x90 net/tipc/socket.c:1528 Code: df 80 3c 08 00 74 05 e8 04 c0 52 fd 4d 8b 67 18 4c 89 e7 31 f6 e8 f6 5a 36 ff 4c 89 ff 4c 89 f6 48 89 da e8 48 d2 ff ff 89 c3 <4c> 89 e7 e8 ae 9b 35 ff 89 d8 5b 41 5c 41 5e 41 5f c3 0f 1f 40 00 RSP: 0018:ffff8881d8a0fb38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffffc90000540000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881d8a0fc90 R08: ffffffff84413fef R09: ffffffff84413c4b R10: ffff8881efbe0fc0 R11: 0000000000000002 R12: ffff8881ecd34980 R13: ffff8881da9652c0 R14: ffff8881d8a0fe40 R15: ffff8881da9652c0 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306 ___sys_sendmsg net/socket.c:2360 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2406 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f9d6f8830a9 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:00007f9d6ebfd0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9d6f9b9f80 RCX: 00007f9d6f8830a9 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000006 RBP: 00007f9d6f8f2074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f9d6f9b9f80 R15: 00007ffee7d610a8 Modules linked in: CR2: 0000000000000000 ---[ end trace e025b3bea4857acc ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206 RAX: ffffffff8154d7aa RBX: 0000000000000100 RCX: ffff8881efbe0fc0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d4f871c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa690 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d4f871c0 FS: 00007f9d6ebfd6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001ca46a000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 05 e8 04 c0 52 add $0x52c004e8,%eax b: fd std c: 4d 8b 67 18 mov 0x18(%r15),%r12 10: 4c 89 e7 mov %r12,%rdi 13: 31 f6 xor %esi,%esi 15: e8 f6 5a 36 ff call 0xff365b10 1a: 4c 89 ff mov %r15,%rdi 1d: 4c 89 f6 mov %r14,%rsi 20: 48 89 da mov %rbx,%rdx 23: e8 48 d2 ff ff call 0xffffd270 28: 89 c3 mov %eax,%ebx * 2a: 4c 89 e7 mov %r12,%rdi <-- trapping instruction 2d: e8 ae 9b 35 ff call 0xff359be0 32: 89 d8 mov %ebx,%eax 34: 5b pop %rbx 35: 41 5c pop %r12 37: 41 5e pop %r14 39: 41 5f pop %r15 3b: c3 ret 3c: 0f 1f 40 00 nopl 0x0(%rax)