BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1eba66067 P4D 1eba66067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3950 Comm: syz.1.969 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e5052f40 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881f4cff1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffb310 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881f4cff1c0 FS: 000055556f412500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001da6a2000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x81d/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:__tlb_remove_page_size+0x2b/0x300 mm/mmu_gather.c:76 Code: 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 20 48 89 75 b8 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 c9 88 d8 ff 48 89 5d c8 <48> 83 c3 28 48 89 d8 48 c1 e8 03 48 89 45 d0 42 80 3c 20 00 74 08 RSP: 0018:ffff8881d6e1f8e8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8186f617 RBX: ffff8881d6e1fbe0 RCX: ffff8881e5052f40 RDX: 0000000000000000 RSI: ffffea000774c9c0 RDI: ffff8881d6e1fbe0 RBP: ffff8881d6e1f930 R08: dffffc0000000000 R09: fffff94000ee993f R10: fffff94000ee993f R11: 1ffffd4000ee993e R12: dffffc0000000000 R13: ffffea000774c9c0 R14: 00007f456332e000 R15: ffff8881ea373968 __tlb_remove_page include/asm-generic/tlb.h:426 [inline] zap_pte_range mm/memory.c:1108 [inline] zap_pmd_range mm/memory.c:1222 [inline] zap_pud_range mm/memory.c:1251 [inline] zap_p4d_range mm/memory.c:1272 [inline] unmap_page_range+0xf7c/0x1b20 mm/memory.c:1293 unmap_single_vma mm/memory.c:1338 [inline] unmap_vmas+0x245/0x340 mm/memory.c:1370 exit_mmap+0x2bb/0x520 mm/mmap.c:3191 __mmput+0x92/0x2e0 kernel/fork.c:1101 mmput+0x47/0x60 kernel/fork.c:1122 exit_mm kernel/exit.c:538 [inline] do_exit+0x99f/0x2660 kernel/exit.c:848 do_group_exit+0x13e/0x300 kernel/exit.c:984 __do_sys_exit_group kernel/exit.c:995 [inline] __se_sys_exit_group kernel/exit.c:993 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f4563bc5969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff41e6b9e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4563bc5969 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fff41e6ba4c R08: 0000001e41e6badf R09: 00000000000927c0 R10: 0000000000000244 R11: 0000000000000246 R12: 00000000000000c7 R13: 00000000000927c0 R14: 000000000001934e R15: 00007fff41e6baa0 Modules linked in: CR2: 0000000000000000 ---[ end trace d1eac3cc6238b7a4 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e5052f40 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881f4cff1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffb310 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881f4cff1c0 FS: 000055556f412500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001da6a2000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 48 89 e5 mov %rsp,%rbp 3: 41 57 push %r15 5: 41 56 push %r14 7: 41 55 push %r13 9: 41 54 push %r12 b: 53 push %rbx c: 48 83 ec 20 sub $0x20,%rsp 10: 48 89 75 b8 mov %rsi,-0x48(%rbp) 14: 48 89 fb mov %rdi,%rbx 17: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 1e: fc ff df 21: e8 c9 88 d8 ff call 0xffd888ef 26: 48 89 5d c8 mov %rbx,-0x38(%rbp) * 2a: 48 83 c3 28 add $0x28,%rbx <-- trapping instruction 2e: 48 89 d8 mov %rbx,%rax 31: 48 c1 e8 03 shr $0x3,%rax 35: 48 89 45 d0 mov %rax,-0x30(%rbp) 39: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 3e: 74 08 je 0x48