BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1f28f2067 P4D 1f28f2067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 705 Comm: syz.1.93 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: ffff8881e4036e40 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881cd93b1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9880 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cd93b1c0 FS: 00007f4f9a80e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e9ac2000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: <IRQ> 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 </IRQ> RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x1/0x80 kernel/kcov.c:273 Code: 44 01 08 03 00 00 00 4a 89 7c 01 10 4a 89 74 01 18 4a 89 44 01 20 48 ff c2 48 89 11 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 48 8b 45 08 65 48 8b 15 40 0b a3 7e 65 8b 0d 45 0b a3 7e RSP: 0018:ffff8881e401f4d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff82209b0e RBX: 0000000000000001 RCX: ffff8881e4036e40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881e401f598 R08: dffffc0000000000 R09: fffff94000e7408f R10: fffff94000e7408f R11: 1ffffd4000e7408e R12: ffffffff84da3280 R13: 1ffff1103c803ea0 R14: 0000000080000001 R15: ffffffff84c34be0 __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:64 __mod_lruvec_state+0x11e/0x2a0 mm/memcontrol.c:766 __mod_lruvec_page_state include/linux/memcontrol.h:770 [inline] page_remove_file_rmap mm/rmap.c:1261 [inline] page_remove_rmap+0x53b/0x800 mm/rmap.c:1317 zap_pte_range mm/memory.c:1105 [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+0xe8f/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 get_signal+0xdee/0x13d0 kernel/signal.c:2738 do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194 ret_from_intr+0x1c/0x1c RIP: 0033:0x1457 Code: Bad RIP value. RSP: 002b:0000200000000178 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f4f9c3ccfa0 RCX: 00007f4f9c1a5969 RDX: 0000200000000180 RSI: 0000200000000170 RDI: 0000000042800600 RBP: 00007f4f9c227ab1 R08: 0000200000000200 R09: 0000200000000200 R10: 00002000000001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4f9c3ccfa0 R15: 00007ffc96834fc8 Modules linked in: CR2: 0000000000000000 ---[ end trace c1746bdf7c14761a ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e4036e40 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881cd93b1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9880 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cd93b1c0 FS: 00007f4f9a80e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e9ac2000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 44 01 08 add %r9d,(%rax) 3: 03 00 add (%rax),%eax 5: 00 00 add %al,(%rax) 7: 4a 89 7c 01 10 mov %rdi,0x10(%rcx,%r8,1) c: 4a 89 74 01 18 mov %rsi,0x18(%rcx,%r8,1) 11: 4a 89 44 01 20 mov %rax,0x20(%rcx,%r8,1) 16: 48 ff c2 inc %rdx 19: 48 89 11 mov %rdx,(%rcx) 1c: 5d pop %rbp 1d: c3 ret 1e: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 25: 00 00 00 00 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 48 8b 45 08 mov 0x8(%rbp),%rax 31: 65 48 8b 15 40 0b a3 mov %gs:0x7ea30b40(%rip),%rdx # 0x7ea30b79 38: 7e 39: 65 8b 0d 45 0b a3 7e mov %gs:0x7ea30b45(%rip),%ecx # 0x7ea30b85