rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=8a8c/1/0x4000000000000000 softirq=106739/106740 fqs=5246 rcu: hardirqs softirqs csw/system rcu: number: 8096 0 0 rcu: cputime: 111 49877 2489 ==> 52490(ms) rcu: (t=10501 jiffies g=147725 q=2814 ncpus=2) CPU: 0 UID: 0 PID: 6280 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 2d ed cf f5 f7 c3 00 02 00 00 74 05 e8 90 cd fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 00 c1 f5 65 8b 05 bd 40 99 07 85 c0 74 18 5b 41 5e e9 8c d1 RSP: 0018:ffffc90000007e08 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000101 RDX: 0000000000000003 RSI: ffffffff8e228edb RDI: 0000000000000001 RBP: ffff888032cf8938 R08: ffffffff90574837 R09: 1ffffffff20ae906 R10: dffffc0000000000 R11: fffffbfff20ae907 R12: ffff8880b86281c0 R13: ffffffff89cdedf0 R14: ffff8880b86281c0 R15: 1ffff110170c50a2 FS: 00007fa1ebfc3880(0000) GS:ffff888124f55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0127a11d1a CR3: 0000000068e57000 CR4: 0000000000350ef0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x2bf/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:stack_trace_consume_entry+0x4/0x280 kernel/stacktrace.c:83 Code: 5d e9 ab 44 5e ff cc e8 ea b7 1e 0a 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90006d67160 EFLAGS: 00000282 RAX: ffffffff84897cfd RBX: ffffc90006d67220 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff84897cfd RDI: ffffc90006d67220 RBP: ffffc90006d671f0 R08: ffffc90006d67580 R09: ffffc90006d671b8 R10: dffffc0000000000 R11: ffffffff81b1fc80 R12: ffff88802c435d00 R13: ffffffff8228dcdd R14: ffffffff81b1fc80 R15: ffffc90006d67168 arch_stack_walk+0x10f/0x150 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_noprof+0x375/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x2ad/0x570 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x5fa/0x640 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x246/0x5f0 security/tomoyo/file.c:728 tomoyo_path_mknod+0x14a/0x1a0 security/tomoyo/tomoyo.c:252 security_path_mknod+0x176/0x370 security/security.c:1417 may_o_create+0x2d/0x370 fs/namei.c:4324 lookup_open fs/namei.c:4464 [inline] open_last_lookups fs/namei.c:4608 [inline] path_openat+0xfab/0x3830 fs/namei.c:4860 do_file_open+0x23e/0x4a0 fs/namei.c:4892 do_sys_openat2+0x115/0x200 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa1eb8a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffdf01ee590 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa1ebfc3880 RCX: 00007fa1eb8a7407 RDX: 0000000000080241 RSI: 00007ffdf01eeaf0 RDI: ffffffffffffff9c RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001b6 R11: 0000000000000202 R12: 0000560093962dfc R13: 0000560093962dfc R14: 0000000000000001 R15: 000056009397d140