rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9293/1:b..l rcu: (detected by 1, t=10502 jiffies, g=25245, q=5212 ncpus=2) task:syz.3.749 state:R running task stack:27328 pid:9293 tgid:9291 ppid:5835 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:395 [inline] RIP: 0010:__rcu_read_unlock+0x34/0x110 kernel/rcu/tree_plugin.h:434 Code: 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 65 4c 8b 34 25 00 d6 03 00 4d 8d ae 44 04 00 00 4c 89 eb 48 c1 eb 03 42 0f b6 04 23 <84> c0 75 6b 41 8b 6d 00 ff cd 42 0f b6 04 23 84 c0 75 76 41 89 6d RSP: 0018:ffffc9001f0dfce8 EFLAGS: 00000217 RAX: 0000000000000000 RBX: 1ffff11005087448 RCX: ffffc9001f0dfc03 RDX: 0000000000000000 RSI: ffffffff8c0aa960 RDI: ffffffff8c5f9680 RBP: ffffc9001f0dfdf0 R08: ffffffff90196577 R09: 1ffffffff2032cae R10: dffffc0000000000 R11: fffffbfff2032caf R12: dffffc0000000000 R13: ffff88802843a244 R14: ffff888028439e00 R15: ffffe8ffffd3fd90 rcu_read_unlock include/linux/rcupdate.h:882 [inline] class_rcu_destructor include/linux/rcupdate.h:1161 [inline] sched_mm_cid_remote_clear_old kernel/sched/core.c:10497 [inline] task_mm_cid_work+0x2b8/0x790 kernel/sched/core.c:10557 task_work_run+0x251/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f038bd7ff19 RSP: 002b:00007f038cbaa0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f038bf46088 RCX: 00007f038bd7ff19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f038bf4608c RBP: 00007f038bf46080 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f038bf4608c R13: 0000000000000000 R14: 00007ffd7e7dc1e0 R15: 00007ffd7e7dc2c8