Hello, The following program triggers call of NULL timer func:
https://gist.githubusercontent.com/dvyukov/c210d01c74b911273469a93862ea7788/raw/2a3182772a6a6e20af3e71c02c2a1c2895d803fb/gistfile1.txt BUG: unable to handle kernel NULL pointer dereference at (null) IP: (null) PGD 0 Oops: 0010 [#1] SMP KASAN Modules linked in: CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.11.0-rc3+ #365 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006c634300 task.stack: ffff88006c640000 RIP: 0010: (null) RSP: 0018:ffff88006d1077c8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff880062bddb00 RCX: ffffffff8154e161 RDX: 1ffffffff090c1f1 RSI: 0000000000000000 RDI: ffff880062bddb00 RBP: ffff88006d1077e8 R08: fffffbfff0a936a8 R09: 0000000000000001 R10: 0000000000000001 R11: fffffbfff0a936a7 R12: ffffffff84860f80 R13: 0000000000000000 R14: ffff880062bddb60 R15: 1ffff1000da20f05 FS: 0000000000000000(0000) GS:ffff88006d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000004e21000 CR4: 00000000001406e0 Call Trace: <IRQ> neigh_timer_handler+0x365/0xd40 net/core/neighbour.c:944 call_timer_fn+0x232/0x8c0 kernel/time/timer.c:1268 expire_timers kernel/time/timer.c:1307 [inline] __run_timers+0x6f7/0xbd0 kernel/time/timer.c:1601 run_timer_softirq+0x21/0x80 kernel/time/timer.c:1614 __do_softirq+0x2d6/0xb54 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1b1/0x1e0 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:657 [inline] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:962 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:487 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53 RSP: 0018:ffff88006c647dc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: 1ffff1000d8c8fbb RCX: 0000000000000000 RDX: 1ffffffff09d8ed4 RSI: 0000000000000001 RDI: ffffffff84ec76a0 RBP: ffff88006c647dc0 R08: ffffed000d8c6861 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff09d8ed2 R13: ffff88006c647e78 R14: ffffffff84ec7690 R15: 0000000000000002 </IRQ> arch_safe_halt arch/x86/include/asm/paravirt.h:98 [inline] default_idle+0xba/0x450 arch/x86/kernel/process.c:275 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:266 default_idle_call+0x37/0x80 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:155 [inline] do_idle+0x230/0x380 kernel/sched/idle.c:244 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:346 start_secondary+0x2a7/0x340 arch/x86/kernel/smpboot.c:275 start_cpu+0x14/0x14 arch/x86/kernel/head_64.S:306 Code: Bad RIP value. RIP: (null) RSP: ffff88006d1077c8 CR2: 0000000000000000 ---[ end trace 845120b8a0d21411 ]--- On commit 093b995e3b55a0ae0670226ddfcb05bfbf0099ae
