BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1d72d5067 P4D 1d72d5067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1085 Comm: syz.3.214 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: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e602cec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881ebfcf1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9d98 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebfcf1c0 FS: 00007fdc630676c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d7bfc000 CR4: 00000000003406a0 DR0: 0000000000000000 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:find_stack lib/stackdepot.c:185 [inline] RIP: 0010:stack_depot_save+0x164/0x4c0 lib/stackdepot.c:245 Code: 44 89 e3 81 e3 ff ff 0f 00 4c 8b 2c dd 80 18 5c 86 4d 85 ed 74 59 44 89 ff eb 09 4d 8b 6d 00 4d 85 ed 74 4b 45 39 65 08 75 f1 <45> 39 7d 0c 75 eb 31 c9 49 8b 34 ce 49 3b 74 cd 18 75 de 48 ff c1 RSP: 0018:ffff8881e804f5f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 000000000008b3b8 RCX: 00000000b137d042 RDX: 0000000000000dc0 RSI: 00000000cad70bfc RDI: 000000000000000d RBP: ffff8881e804f640 R08: 0000000064747e05 R09: 0000000039a12f94 R10: 0000000043e0eea7 R11: 00000000a7e85c60 R12: 000000007d08b3b8 R13: ffff8881ea154140 R14: ffff8881e804f670 R15: 000000000000000d save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x1c3/0x200 mm/kasan/common.c:529 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x106/0x2f0 mm/slub.c:3909 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] ops_init+0x89/0x4a0 net/core/net_namespace.c:131 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 copy_net_ns+0x314/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x1194/0x2cf0 kernel/fork.c:2055 _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: 0033:0x7fdc649fe969 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:00007fdc63066fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fdc64c25fa0 RCX: 00007fdc649fe969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000061980200 RBP: 00007fdc64a80ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdc64c25fa0 R15: 00007fff469e1a08 Modules linked in: CR2: 0000000000000000 ---[ end trace 72d4a3daf93fc33c ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e602cec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881ebfcf1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9d98 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebfcf1c0 FS: 00007fdc630676c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d7bfc000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 44 89 e3 mov %r12d,%ebx 3: 81 e3 ff ff 0f 00 and $0xfffff,%ebx 9: 4c 8b 2c dd 80 18 5c mov -0x79a3e780(,%rbx,8),%r13 10: 86 11: 4d 85 ed test %r13,%r13 14: 74 59 je 0x6f 16: 44 89 ff mov %r15d,%edi 19: eb 09 jmp 0x24 1b: 4d 8b 6d 00 mov 0x0(%r13),%r13 1f: 4d 85 ed test %r13,%r13 22: 74 4b je 0x6f 24: 45 39 65 08 cmp %r12d,0x8(%r13) 28: 75 f1 jne 0x1b * 2a: 45 39 7d 0c cmp %r15d,0xc(%r13) <-- trapping instruction 2e: 75 eb jne 0x1b 30: 31 c9 xor %ecx,%ecx 32: 49 8b 34 ce mov (%r14,%rcx,8),%rsi 36: 49 3b 74 cd 18 cmp 0x18(%r13,%rcx,8),%rsi 3b: 75 de jne 0x1b 3d: 48 ff c1 inc %rcx