================================================================== BUG: KFENCE: use-after-free read in xfrmi_exit_batch_rtnl+0x9e/0x2e0 Use-after-free read at 0xffff88823bd98cc8 (in kfence-#203): xfrmi_exit_batch_rtnl+0x9e/0x2e0 cleanup_net+0x709/0xcc0 net/core/net_namespace.c:633 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 kfence-#203: 0xffff88823bd98000-0xffff88823bd980b7, size=184, cache=rtable allocated by task 0 on cpu 1 at 618.745684s: dst_alloc+0x12b/0x190 net/core/dst.c:89 rt_dst_alloc net/ipv4/route.c:1612 [inline] __mkroute_output net/ipv4/route.c:2573 [inline] ip_route_output_key_hash_rcu+0x13cc/0x2390 net/ipv4/route.c:2795 ip_route_output_key_hash+0x193/0x2b0 net/ipv4/route.c:2624 __ip_route_output_key include/net/route.h:140 [inline] ip_route_output_flow+0x29/0x140 net/ipv4/route.c:2852 ip_route_output_key include/net/route.h:150 [inline] tipc_udp_xmit+0x225/0xa10 net/tipc/udp_media.c:186 tipc_bearer_xmit_skb+0x2f5/0x460 net/tipc/bearer.c:571 tipc_disc_timeout+0x5ee/0x760 net/tipc/discover.c:338 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0x112/0x480 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x375/0x5d0 kernel/sched/idle.c:332 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430 __pfx_ap_starting+0x0/0x10 arch/x86/kernel/smpboot.c:313 common_startup_64+0x13e/0x147 freed by task 24 on cpu 1 at 625.036544s: dst_destroy+0x2ac/0x460 net/core/dst.c:124 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2809 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 CPU: 1 PID: 9707 Comm: kworker/u8:17 Not tainted 6.10.0-rc7-syzkaller-01603-g80ab5445da62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: netns cleanup_net RIP: 0010:xfrmi_exit_batch_rtnl+0x9e/0x2e0 net/xfrm/xfrm_interface_core.c:970 Code: 02 00 00 48 89 2c 24 48 89 5c 24 08 48 8d bb 58 ff ff ff 8b 35 43 13 8a 05 e8 ae c6 ff ff 49 89 c4 45 31 ff 4b 8d 1c fc eb 0c <48> 8b 7d 00 4c 89 ee e8 a6 38 35 ff e8 31 c7 64 01 89 c5 31 ff 89 RSP: 0018:ffffc90009a1fa78 EFLAGS: 00010246 RAX: 1ffff110477b3199 RBX: ffff88823bd98cc0 RCX: ffff88806a2d3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88823bd98cc8 R08: ffffffff895f1486 R09: 1ffffffff1f5c5c5 R10: dffffc0000000000 R11: fffffbfff1f5c5c6 R12: ffff88801dd4a000 R13: ffffc90009a1fb40 R14: dffffc0000000000 R15: 00000000000000c3 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bd98cc8 CR3: 000000004e4ea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cleanup_net+0x709/0xcc0 net/core/net_namespace.c:633 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 ================================================================== ---------------- Code disassembly (best guess): 0: 02 00 add (%rax),%al 2: 00 48 89 add %cl,-0x77(%rax) 5: 2c 24 sub $0x24,%al 7: 48 89 5c 24 08 mov %rbx,0x8(%rsp) c: 48 8d bb 58 ff ff ff lea -0xa8(%rbx),%rdi 13: 8b 35 43 13 8a 05 mov 0x58a1343(%rip),%esi # 0x58a135c 19: e8 ae c6 ff ff call 0xffffc6cc 1e: 49 89 c4 mov %rax,%r12 21: 45 31 ff xor %r15d,%r15d 24: 4b 8d 1c fc lea (%r12,%r15,8),%rbx 28: eb 0c jmp 0x36 * 2a: 48 8b 7d 00 mov 0x0(%rbp),%rdi <-- trapping instruction 2e: 4c 89 ee mov %r13,%rsi 31: e8 a6 38 35 ff call 0xff3538dc 36: e8 31 c7 64 01 call 0x164c76c 3b: 89 c5 mov %eax,%ebp 3d: 31 ff xor %edi,%edi 3f: 89 .byte 0x89