rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=413/1/0x4000000000000002 softirq=49360/49361 fqs=2100 (detected by 1, t=10503 jiffies, g=68785, q=1093) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16390 Comm: syz.6.3187 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:match_held_lock+0x0/0xb0 kernel/locking/lockdep.c:5070 Code: db 85 c0 74 d8 83 3d e6 6f c1 03 00 75 cf 48 c7 c7 60 14 0b 8a 48 c7 c6 a0 14 0b 8a e8 79 35 f5 ff 0f 0b eb b6 e8 f0 fa ff ff 01 00 00 00 48 39 77 10 74 6c 53 81 7f 20 00 00 10 00 72 5f 48 RSP: 0018:ffffc90000006f50 EFLAGS: 00000097 RAX: 0000000000000000 RBX: ffff888029fa8000 RCX: b370dbb475fbd600 RDX: 0000000000000100 RSI: ffffffff8c11c360 RDI: ffff888029fa8af0 RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffffbfff1ff6e19 R10: fffffbfff1ff6e19 R11: 1ffffffff1ff6e18 R12: 0000000000000000 R13: 0000000000000046 R14: ffffffff8c11c360 R15: ffff888029fa8af0 FS: 00007f3bbf6286c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002a0fb8 CR3: 000000005114a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __lock_is_held kernel/locking/lockdep.c:5366 [inline] lock_is_held_type+0xa6/0x190 kernel/locking/lockdep.c:5666 __perf_output_begin kernel/events/ring_buffer.c:170 [inline] perf_output_begin_forward+0x1a6/0xa30 kernel/events/ring_buffer.c:271 __perf_event_output kernel/events/core.c:7790 [inline] perf_event_output_forward+0x15c/0x280 kernel/events/core.c:7808 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9501 perf_swevent_overflow kernel/events/core.c:9577 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9615 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10033 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10007 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:671 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 7d 16 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900000077a0 EFLAGS: 00000206 RAX: b370dbb475fbd600 RBX: 1ffff92000000ef8 RCX: b370dbb475fbd600 RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: ffffffff8a599340 RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff6e39 R10: fffffbfff1ff6e39 R11: 1ffffffff1ff6e38 R12: ffffffff8c120800 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:771 [inline] ndisc_send_skb+0xdc4/0x14a0 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3957 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x525/0x7c0 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:kmalloc_slab+0x59/0xa0 mm/slab_common.c:759 Code: b8 ff ff ff ff 0f bd 44 24 04 ff c0 f7 c6 11 00 40 00 75 25 45 31 f6 89 c3 83 f8 0e 73 3f 49 6b c6 70 48 8b 84 d8 60 f1 bb 8b <48> 83 c4 08 5b 41 5e c3 b8 10 00 00 00 eb f1 41 be 03 00 00 00 40 RSP: 0018:ffffc90002d1fa78 EFLAGS: 00000206 RAX: ffff888016841500 RBX: 0000000000000005 RCX: 0000000000080000 RDX: ffffc900162d2000 RSI: 0000000000000d40 RDI: 0000000000000003 RBP: 0000000000000d40 R08: dffffc0000000000 R09: ffffed1003ea5e00 R10: ffffed1003ea5e00 R11: 1ffff11003ea5dfe R12: 0000000000000000 R13: 000000000000000e R14: 0000000000000000 R15: dffffc0000000000 __kmalloc+0x38/0x330 mm/slub.c:4398 kmalloc include/linux/slab.h:609 [inline] kzalloc include/linux/slab.h:735 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x27e/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x5cd/0x610 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1d5/0x5d0 security/tomoyo/file.c:723 security_file_ioctl+0x6c/0xa0 security/security.c:1555 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x48/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3bc13e1be9 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:00007f3bbf628038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3bc1609090 RCX: 00007f3bc13e1be9 RDX: 0000200000000280 RSI: 0000000000008914 RDI: 0000000000000009 RBP: 00007f3bc1464e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3bc1609128 R14: 00007f3bc1609090 R15: 00007ffdd9255898