rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29094/1:b..l rcu: (detected by 1, t=10502 jiffies, g=189337, q=1375546 ncpus=2) task:syz-executor state:R running task stack:24248 pid:29094 tgid:29094 ppid:29083 task_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288 irqentry_exit+0x36/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:page_ext_iter_next include/linux/page_ext.h:155 [inline] RIP: 0010:__page_table_check_zero+0x2d3/0x5d0 mm/page_table_check.c:139 Code: 85 a5 01 00 00 e8 8d d3 8d ff 48 8b 44 24 10 31 ff 48 8d 5c 05 01 48 89 d8 25 ff 7f 00 00 48 89 c6 48 89 04 24 e8 dd ce 8d ff <48> 8b 04 24 48 85 c0 0f 84 9c 00 00 00 e8 5b d3 8d ff 48 8b 44 24 RSP: 0018:ffffc90003cbf4d8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 000000000008caae RCX: ffffffff822dbe73 RDX: ffff88806e512440 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000004aae R11: 0000000000013306 R12: ffff888020175610 R13: ffff88802017565c R14: 0000000000000002 R15: dffffc0000000000 page_table_check_free include/linux/page_table_check.h:43 [inline] free_pages_prepare mm/page_alloc.c:1396 [inline] __free_frozen_pages+0x7b7/0x10f0 mm/page_alloc.c:2895 discard_slab mm/slub.c:2753 [inline] __put_partials+0x165/0x1c0 mm/slub.c:3218 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_noprof+0x1d4/0x510 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_realpath_from_path+0xc2/0x6e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x2ab/0x3c0 security/tomoyo/file.c:771 tomoyo_file_open+0x6b/0x90 security/tomoyo/tomoyo.c:334 security_file_open+0x84/0x1e0 security/security.c:3144 do_dentry_open+0x596/0x1530 fs/open.c:942 vfs_open+0x82/0x3f0 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa58c98e4e1 RSP: 002b:00007ffd7f255460 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000000005e1 RCX: 00007fa58c98e4e1 RDX: 0000000000090800 RSI: 00007fa58ca1210e RDI: 00000000ffffff9c RBP: 00007ffd7f25550c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000287 R12: 000000000000020e R13: 0000000000000000 R14: 00000000001cec10 R15: 00007ffd7f255560