------------[ cut here ]------------ WARNING: net/ipv4/ipmr.c:2302 at ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302, CPU#1: kworker/u8:53/10927 Modules linked in: CPU: 1 UID: 0 PID: 10927 Comm: kworker/u8:53 Not tainted 6.16.0-rc3-next-20250627-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302 Code: df e9 63 f6 ff ff e8 1e 18 be f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 0a fe 4b ff e9 45 f6 ff ff e8 00 18 be f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 f2 17 be f7 90 0f 0b 90 42 80 3c 2b 00 RSP: 0000:ffffc90000a08900 EFLAGS: 00010246 RAX: ffffffff8a01ba60 RBX: ffff88802812e140 RCX: ffff8880703b3c00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a08a10 R08: ffff8880703b3c00 R09: 0000000000000004 R10: 0000000000000003 R11: ffffffff8a01aeb0 R12: 0000000000000010 R13: dffffc0000000000 R14: ffff8880491fa600 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d1e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f27a5a81d58 CR3: 00000000331b6000 CR4: 00000000003526f0 Call Trace: igmp_send_report+0x89e/0xdb0 net/ipv4/igmp.c:799 igmp_timer_expire+0x204/0x510 net/ipv4/igmp.c:-1 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5181 Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 e9 27 05 00 00 4c 8b 75 d0 4c 89 e7 e8 1f 40 e0 09 e8 8a 12 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0000:ffffc9000411f1d8 EFLAGS: 00000286 RAX: aebec5ba070fa900 RBX: 0000000000000000 RCX: aebec5ba070fa900 RDX: 0000000000000006 RSI: ffffffff8d992a42 RDI: ffffffff8be31f80 RBP: ffffc9000411f230 R08: ffffffff8fa18937 R09: 1ffffffff1f43126 R10: dffffc0000000000 R11: fffffbfff1f43127 R12: ffff8880703b3c00 R13: dffffc0000000000 R14: ffff8880267eda00 R15: ffff8880b873ab18 context_switch kernel/sched/core.c:5316 [inline] __schedule+0x16fd/0x4d00 kernel/sched/core.c:6696 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7019 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5948 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 09 13 31 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0000:ffffc9000411f5d8 EFLAGS: 00000206 RAX: aebec5ba070fa900 RBX: 0000000000000000 RCX: aebec5ba070fa900 RDX: 0000000000000000 RSI: ffffffff8db80736 RDI: ffffffff8be31f80 RBP: 00000000ffffffff R08: ffffc9000411f847 R09: 0000000000000000 R10: ffffc9000411f820 R11: fffff52000823f09 R12: 0000000000000246 R13: ffff8880703b3c00 R14: ffffffff8e13bfe0 R15: 0000000000000004 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0xf5/0x610 kernel/sched/core.c:8649 __mutex_lock_common kernel/locking/mutex.c:579 [inline] __mutex_lock+0x106/0xe80 kernel/locking/mutex.c:747 arch_jump_label_transform_queue+0x5f/0x110 arch/x86/kernel/jump_label.c:136 __jump_label_update+0x185/0x3a0 kernel/jump_label.c:513 static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3239 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3322 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 0f 84 3c 01 00 00 je 0x142 6: 48 85 db test %rbx,%rbx 9: 0f 85 63 01 00 00 jne 0x172 f: e9 27 05 00 00 jmp 0x53b 14: 4c 8b 75 d0 mov -0x30(%rbp),%r14 18: 4c 89 e7 mov %r12,%rdi 1b: e8 1f 40 e0 09 call 0x9e0403f 20: e8 8a 12 36 00 call 0x3612af 25: fb sti 26: 4c 8b 65 c0 mov -0x40(%rbp),%r12 * 2a: 49 8d bc 24 18 16 00 lea 0x1618(%r12),%rdi <-- trapping instruction 31: 00 32: 48 89 f8 mov %rdi,%rax 35: 48 c1 e8 03 shr $0x3,%rax 39: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax 3e: 84 c0 test %al,%al