rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6510/1:b..l rcu: (detected by 0, t=10503 jiffies, g=19581, q=2548 ncpus=2) task:syz.2.238 state:R running task stack:28128 pid:6510 tgid:6504 ppid:5643 task_flags:0x400040 flags:0x08080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x760 kernel/entry/common.c:164 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 f1 ad 07 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db e8 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 40 a1 0a 0a cc 48 8d 3d 88 8d 92 RSP: 0018:ffffc900037af598 EFLAGS: 00000282 RAX: 870208618f0b5500 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000074397c20 RSI: ffffffff8e220627 RDI: ffffffff8c28b660 RBP: ffffffff8176e256 R08: ffffffff8176e256 R09: ffffffff8e95cca0 R10: ffffc900037af6f8 R11: ffffffff81b0e020 R12: 0000000000000002 R13: ffffffff8e95cca0 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] class_rcu_constructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0xc3/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 __slab_free+0x274/0x2c0 mm/slub.c:5613 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 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:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4918 __d_alloc+0x37/0x6f0 fs/dcache.c:1807 d_alloc+0x4b/0x190 fs/dcache.c:1886 lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1801 __start_dirop fs/namei.c:2916 [inline] start_dirop fs/namei.c:2938 [inline] start_creating_noperm+0x80/0xb0 fs/namei.c:3517 mqueue_file_open ipc/mqueue.c:896 [inline] do_mq_open+0x246/0x7d0 ipc/mqueue.c:924 __do_compat_sys_mq_open ipc/mqueue.c:1503 [inline] __se_compat_sys_mq_open ipc/mqueue.c:1493 [inline] __ia32_compat_sys_mq_open+0x22a/0x290 ipc/mqueue.c:1493 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x229/0x6e0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fc401c RSP: 002b:00000000f546550c EFLAGS: 00000206 ORIG_RAX: 0000000000000115 RAX: ffffffffffffffda RBX: 0000000080000a00 RCX: 0000000000000042 RDX: 00000000000001f0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000