BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1e9652067 P4D 1e9652067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 2479 Comm: syz.0.580 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: 0000000000000102 RCX: ffff8881eb059f80 RDX: 0000000000000102 RSI: 0000000000000000 RDI: ffff8881f2dd31c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffb440 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881f2dd31c0 FS: 00007fc278faf6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e8d35000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 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:__sanitizer_cov_trace_pc+0x1f/0x50 kernel/kcov.c:197 Code: 5d c3 00 00 90 90 00 00 90 90 00 55 48 89 e5 48 8b 45 08 65 48 8b 0d 90 0e a3 7e 65 8b 15 95 0e a3 7e f7 c2 00 01 1f 00 74 02 <5d> c3 8b 91 00 0a 00 00 83 fa 02 75 f3 48 8b 91 08 0a 00 00 48 8b RSP: 0018:ffff8881d45c7830 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81848888 RBX: dead000000000100 RCX: 0000000000080000 RDX: ffffc90000944000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffff8881d45c7830 R08: dffffc0000000000 R09: fffff94000ec7ecf R10: fffff94000ec7ecf R11: 1ffffd4000ec7ece R12: 1ffffd4000ec7ec9 R13: dffffc0000000000 R14: ffffea000763f640 R15: 80000001d8fd9007 compound_head include/linux/page-flags.h:176 [inline] PageSwapBacked include/linux/page-flags.h:340 [inline] mm_counter_file include/linux/mm.h:1794 [inline] mm_counter include/linux/mm.h:1803 [inline] copy_one_pte mm/memory.c:806 [inline] copy_pte_range mm/memory.c:855 [inline] copy_pmd_range mm/memory.c:906 [inline] copy_pud_range mm/memory.c:940 [inline] copy_p4d_range mm/memory.c:962 [inline] copy_page_range+0xf28/0x1730 mm/memory.c:1024 dup_mmap kernel/fork.c:608 [inline] dup_mm kernel/fork.c:1379 [inline] copy_mm+0xb65/0x1150 kernel/fork.c:1435 copy_process+0x1163/0x2cf0 kernel/fork.c:2052 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fc27a946969 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:00007fc278faefe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fc27ab6dfa0 RCX: 00007fc27a946969 RDX: 0000200000000080 RSI: 00002000000004d0 RDI: 0000000004000000 RBP: 00007fc27a9c8ab1 R08: 0000200000000140 R09: 0000200000000140 R10: 00002000000000c0 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc27ab6dfa0 R15: 00007ffdf42f59a8 Modules linked in: CR2: 0000000000000000 ---[ end trace 95016de64c137743 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000102 RCX: ffff8881eb059f80 RDX: 0000000000000102 RSI: 0000000000000000 RDI: ffff8881f2dd31c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffb440 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881f2dd31c0 FS: 00007fc278faf6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e8d35000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 5d pop %rbp 1: c3 ret 2: 00 00 add %al,(%rax) 4: 90 nop 5: 90 nop 6: 00 00 add %al,(%rax) 8: 90 nop 9: 90 nop a: 00 55 48 add %dl,0x48(%rbp) d: 89 e5 mov %esp,%ebp f: 48 8b 45 08 mov 0x8(%rbp),%rax 13: 65 48 8b 0d 90 0e a3 mov %gs:0x7ea30e90(%rip),%rcx # 0x7ea30eab 1a: 7e 1b: 65 8b 15 95 0e a3 7e mov %gs:0x7ea30e95(%rip),%edx # 0x7ea30eb7 22: f7 c2 00 01 1f 00 test $0x1f0100,%edx 28: 74 02 je 0x2c * 2a: 5d pop %rbp <-- trapping instruction 2b: c3 ret 2c: 8b 91 00 0a 00 00 mov 0xa00(%rcx),%edx 32: 83 fa 02 cmp $0x2,%edx 35: 75 f3 jne 0x2a 37: 48 8b 91 08 0a 00 00 mov 0xa08(%rcx),%rdx 3e: 48 rex.W 3f: 8b .byte 0x8b