rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=312197, q=436) rcu: All QSes seen, last rcu_preempt kthread activity 10493 (4295217260-4295206767), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.1 R running task 23480 29249 8221 0x80004000 Call Trace: sched_show_task+0x40f/0x560 kernel/sched/core.c:5954 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1861/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x1b2/0x250 kernel/locking/lockdep.c:4488 Code: c1 e8 03 42 80 3c 30 00 74 0c 48 c7 c7 28 96 aa 88 e8 32 3b 55 00 48 83 3d c2 cb 50 07 00 0f 84 9c 00 00 00 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 RSP: 0000:ffff8880407aed18 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11552c5 RBX: 0000000000000000 RCX: ffffffff815aa172 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffff8880407aed70 R08: dffffc0000000000 R09: fffffbfff12fd1c3 R10: fffffbfff12fd1c3 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888099c283c8 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] vmpressure mm/vmpressure.c:271 [inline] vmpressure_prio+0x66/0x120 mm/vmpressure.c:339 do_try_to_free_pages+0x1f0/0x920 mm/vmscan.c:3080 try_to_free_mem_cgroup_pages+0x344/0x680 mm/vmscan.c:3383 try_charge+0x60d/0x18d0 mm/memcontrol.c:2572 mem_cgroup_try_charge+0x20c/0x680 mm/memcontrol.c:6513 __add_to_page_cache_locked+0x951/0xbf0 mm/filemap.c:866 add_to_page_cache_lru+0x156/0x4a0 mm/filemap.c:943 generic_file_buffered_read mm/filemap.c:2237 [inline] generic_file_read_iter+0x1279/0x21b0 mm/filemap.c:2324 ext4_file_read_iter+0x25b/0x3a0 include/linux/fs.h:806 call_read_iter include/linux/fs.h:1889 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0x59e/0x730 fs/read_write.c:427 integrity_kernel_read+0x113/0x190 security/integrity/iint.c:200 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:360 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:389 [inline] ima_calc_file_hash+0xacf/0x1cc0 security/integrity/ima/ima_crypto.c:454 ima_collect_measurement+0x250/0x4d0 security/integrity/ima/ima_api.c:247 process_measurement+0xdae/0x1800 security/integrity/ima/ima_main.c:326 ima_file_check+0x9b/0xe0 security/integrity/ima/ima_main.c:438 do_last fs/namei.c:3412 [inline] path_openat+0x1760/0x4420 fs/namei.c:3525 do_filp_open+0x192/0x3d0 fs/namei.c:3555 do_sys_open+0x29f/0x560 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x87/0x90 fs/open.c:1110 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c176d0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000000000000 RSI: 000000000014103e RDI: 0000000020000780 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c176d16d4 R13: 00000000004fc03f R14: 00000000004dd5f0 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10535 jiffies! g312197 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28864 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x837/0xc50 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352