rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14198/1:b..l rcu: (detected by 0, t=10503 jiffies, g=76765, q=626 ncpus=2) task:syz-executor state:R running task stack:22456 pid:14198 tgid:14198 ppid:14186 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5260 [inline] __schedule+0x14ea/0x5050 kernel/sched/core.c:6867 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7194 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__rcu_read_lock+0x38/0x60 kernel/rcu/tree_plugin.h:420 Code: 81 c3 84 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 18 ff 03 8b 03 3d 00 00 00 40 7d 07 <5b> c3 cc cc cc cc cc 90 0f 0b 90 eb f3 89 d9 80 e1 07 80 c1 03 38 RSP: 0018:ffffc9000e4d72e8 EFLAGS: 00000283 RAX: 0000000000000001 RBX: ffff888056f3e004 RCX: dffffc0000000000 RDX: ffff888056f3db80 RSI: 00000000ff000000 RDI: 00000000f5000000 RBP: dffffc0000000000 R08: ffff88807e4afc9f R09: 1ffff1100fc95f93 R10: dffffc0000000000 R11: ffffed100fc95f94 R12: 0000000000000000 R13: ffffea0001f4d000 R14: 0000000000000000 R15: 0000000000000000 rcu_read_lock include/linux/rcupdate.h:865 [inline] __page_table_check_zero+0x63/0x3e0 mm/page_table_check.c:138 page_table_check_free include/linux/page_table_check.h:43 [inline] free_pages_prepare mm/page_alloc.c:1434 [inline] __free_frozen_pages+0xc07/0xd70 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5956 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3c2/0x7e0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x229/0x470 security/tomoyo/file.c:771 security_file_open+0xa9/0x240 security/security.c:2636 do_dentry_open+0x34e/0x1420 fs/open.c:939 vfs_open+0x3b/0x340 fs/open.c:1094 do_open fs/namei.c:4637 [inline] path_openat+0x3486/0x3e20 fs/namei.c:4796 do_filp_open+0x22d/0x490 fs/namei.c:4823 do_sys_openat2+0x12f/0x220 fs/open.c:1430 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+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffaa499a1dc RSP: 002b:00007ffd760bb370 EFLAGS: 00000206 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ffaa4a0471f RCX: 00007ffaa499a1dc RDX: 0000000000090800 RSI: 00007ffd760bc520 RDI: 00000000ffffff9c RBP: 00007ffd760bc50c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd760bc520 R13: 00007ffaa4a0471f R14: 000000000009bf93 R15: 00007ffd760bc560