BUG: unable to handle page fault for address: ffffffff81c0841c #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 6011067 P4D 6011067 PUD 6012063 PMD 1c001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1282 Comm: syz.0.253 Not tainted 5.4.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x7be/0xbe0 kernel/time/timer.c:1817 Code: 74 2e e8 95 8e 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 82 2f 40 00 <4d> 89 65 00 eb 05 e8 67 8e 0f 00 49 bd 00 00 00 00 00 fc ff df 42 RSP: 0018:ffff8881f6f09d40 EFLAGS: 00010046 RAX: 1ffffffff0381083 RBX: 1ffff1103d592e39 RCX: dffffc0000000000 RDX: 0000000080000101 RSI: 0000000000000004 RDI: ffff8881f6f09cc0 RBP: ffff8881f6f09eb8 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffed103ede1398 R11: dffffc0000000001 R12: ffff8881f6f09e00 R13: ffffffff81c0841c R14: 1ffff1103d592e38 R15: ffff8881eac971c8 FS: 00007f478a8826c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff81c0841c CR3: 00000001e5b1e000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1830 __do_softirq+0x24a/0x687 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19a/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11e/0x4a0 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:update_stack_state+0x498/0x5c0 arch/x86/kernel/unwind_frame.c:248 Code: 8b 5c 24 08 eb 0e 4c 8b 6c 24 50 49 83 ed 80 4c 8b 64 24 10 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 d8 9d 65 00 <65> 48 8b 05 10 f0 d1 7e 49 39 06 74 56 48 8d b4 24 c0 00 00 00 49 RSP: 0018:ffff8881e335efa0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1103c66be41 RBX: ffff8881e335f1e0 RCX: dffffc0000000000 RDX: 1ffff1103c66be08 RSI: ffff8881e335f870 RDI: ffff8881e335f1e0 RBP: ffff8881e335f0d0 R08: ffffffff8154f473 R09: ffff8881e335f1e0 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1103c66be44 R13: ffff8881e335f878 R14: ffff8881e335f208 R15: dffffc0000000000 unwind_next_frame+0x3ed/0x7d0 arch/x86/kernel/unwind_frame.c:311 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 kasan_slab_alloc+0xe/0x10 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] kmem_cache_alloc+0xe0/0x260 mm/slub.c:2842 kmem_cache_zalloc include/linux/slab.h:680 [inline] __proc_create+0x419/0xa00 fs/proc/generic.c:424 proc_create_reg+0x9b/0x120 fs/proc/generic.c:551 proc_create_net_data+0xc3/0x1e0 fs/proc/proc_net.c:91 unix_net_init+0xa8/0xf0 net/unix/af_unix.c:2908 ops_init+0x1cd/0x4a0 net/core/net_namespace.c:141 setup_net+0x214/0x990 net/core/net_namespace.c:348 copy_net_ns+0x32f/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x402/0x5c0 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x12d9/0x3230 kernel/fork.c:2055 _do_fork+0x197/0x900 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f478c219169 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:00007f478a881fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f478c440fa0 RCX: 00007f478c219169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040b04000 RBP: 00007f478c29ba68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f478c440fa0 R15: 00007ffde0f91ad8 Modules linked in: CR2: ffffffff81c0841c ---[ end trace 49c36c1438e7d398 ]--- RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x7be/0xbe0 kernel/time/timer.c:1817 Code: 74 2e e8 95 8e 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 82 2f 40 00 <4d> 89 65 00 eb 05 e8 67 8e 0f 00 49 bd 00 00 00 00 00 fc ff df 42 RSP: 0018:ffff8881f6f09d40 EFLAGS: 00010046 RAX: 1ffffffff0381083 RBX: 1ffff1103d592e39 RCX: dffffc0000000000 RDX: 0000000080000101 RSI: 0000000000000004 RDI: ffff8881f6f09cc0 RBP: ffff8881f6f09eb8 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffed103ede1398 R11: dffffc0000000001 R12: ffff8881f6f09e00 R13: ffffffff81c0841c R14: 1ffff1103d592e38 R15: ffff8881eac971c8 FS: 00007f478a8826c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff81c0841c CR3: 00000001e5b1e000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 74 2e je 0x30 2: e8 95 8e 0f 00 call 0xf8e9c 7: 49 83 c5 08 add $0x8,%r13 b: 4c 89 e8 mov %r13,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 19: fc ff df 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 20: 74 08 je 0x2a 22: 4c 89 ef mov %r13,%rdi 25: e8 82 2f 40 00 call 0x402fac * 2a: 4d 89 65 00 mov %r12,0x0(%r13) <-- trapping instruction 2e: eb 05 jmp 0x35 30: e8 67 8e 0f 00 call 0xf8e9c 35: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 3c: fc ff df 3f: 42 rex.X