rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10494 ticks this GP) idle=7794/1/0x4000000000000000 softirq=58194/58194 fqs=4590 rcu: hardirqs softirqs csw/system rcu: number: 1344668 0 0 rcu: cputime: 17890 34589 43 ==> 52480(ms) rcu: (t=10500 jiffies g=77173 q=2935 ncpus=2) CPU: 0 PID: 15983 Comm: syz.0.3097 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x80 kernel/kcov.c:293 Code: c0 4c 89 01 48 c7 44 11 08 04 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 0d a0 91 7c 7e 65 8b 15 a1 91 7c RSP: 0018:ffffc90000007468 EFLAGS: 00000202 RAX: ffffffff813b3986 RBX: ffffffff81000000 RCX: ffff88806832da00 RDX: 0000000000000100 RSI: ffffffff8ac00000 RDI: ffffffff813b6901 RBP: ffffc90000007500 R08: ffffc90000007600 R09: 0000000000000000 R10: ffffc900000075a8 R11: fffff52000000ec1 R12: ffffc900000075a8 R13: dffffc0000000000 R14: ffffc900000075dd R15: ffffffff813b6901 FS: 00007fc15f0d56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562fa48ca4b0 CR3: 000000005ee87000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: unwind_next_frame+0x1e0/0x2970 arch/x86/kernel/unwind_orc.c:-1 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2a6/0x610 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 0b 94 cc f6 65 8b 05 4c c1 73 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc9000d42ee80 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: b791fec4972eb800 RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: 0000000000000001 RBP: ffffc9000d42ef08 R08: ffffffff911c553f R09: 1ffffffff2238aa7 R10: dffffc0000000000 R11: fffffbfff2238aa8 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88802fd940c0 R15: 1ffff92001a85dd0 finish_task_switch+0x436/0x8f0 kernel/sched/core.c:5285 context_switch kernel/sched/core.c:5384 [inline] __schedule+0x155b/0x45a0 kernel/sched/core.c:6700 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:number+0x1fa/0xf60 lib/vsprintf.c:488 Code: f7 48 8b 5c 24 18 ff cb b0 2b eb 0e e8 7f 2a 10 f7 48 8b 5c 24 18 ff cb b0 20 89 44 24 28 c7 44 24 2c 00 00 00 00 49 c1 fc 30 <80> 7c 24 07 00 4c 89 64 24 38 48 89 5c 24 18 74 3d 48 bb 00 00 00 RSP: 0018:ffffc9000d42f300 EFLAGS: 00000286 RAX: ffffffff8a76f601 RBX: 00ffffffffffffff RCX: ffff88806832da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000d42f408 R08: ffff88806832da00 R09: 0000000000000012 R10: 0000000000000012 R11: 0000000000000000 R12: ffffffffffffffff R13: 00000000f00003ce R14: ffffc9000d42f545 R15: ffff0a00ffffff09 vsnprintf+0x14c6/0x1ba0 lib/vsprintf.c:2889 dynamic_dname+0x120/0x1f0 fs/d_path.c:308 tomoyo_realpath_from_path+0x16a/0x5d0 security/tomoyo/realpath.c:258 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x224/0x460 security/tomoyo/file.c:771 security_file_open+0x62/0xa0 security/security.c:2855 do_dentry_open+0x380/0x1500 fs/open.c:916 do_open fs/namei.c:3640 [inline] path_openat+0x27f1/0x3230 fs/namei.c:3797 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_sys_openat2+0x134/0x1d0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc15e15d04e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007fc15f0d4ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc15f0d56c0 RCX: 00007fc15e15d04e RDX: 0000000000000000 RSI: 00007fc15f0d4f90 RDI: ffffffffffffff9c RBP: 00007fc15e232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc15e416038 R14: 00007fc15e415fa0 R15: 00007ffc026c9e78