rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=32637, q=15600) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294997125-4294986623), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 20872 14776 9889 0x80004002 Call Trace: sched_show_task kernel/sched/core.c:5954 [inline] sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5929 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.cold+0xaf4/0xc02 kernel/rcu/tree.c:2271 update_process_times+0x2d/0x70 kernel/time/timer.c:1726 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x90/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 d8 34 93 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d ff 51 ca 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 a1 d8 87 f9 65 8b 05 92 3b 39 78 RSP: 0018:ffffc90004835c28 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132669b RBX: 0000000000000282 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffffc90004835c38 R08: 1ffffffff1659bbc R09: fffffbfff1659bbd R10: fffffbfff1659bbc R11: ffffffff8b2cdde7 R12: ffffffff8b8c6fc8 R13: ffffffff8b8c6fc8 R14: ffff888049322000 R15: 0000000000000000 __debug_check_no_obj_freed lib/debugobjects.c:973 [inline] debug_check_no_obj_freed+0x20a/0x43f lib/debugobjects.c:994 free_pages_prepare mm/page_alloc.c:1175 [inline] free_pcp_prepare+0x208/0x4f0 mm/page_alloc.c:1205 free_unref_page_prepare mm/page_alloc.c:3022 [inline] free_unref_page_list+0xe1/0x800 mm/page_alloc.c:3091 shrink_page_list+0x1301/0x5550 mm/vmscan.c:1493 shrink_inactive_list+0x4e5/0xe30 mm/vmscan.c:1959 shrink_list mm/vmscan.c:2178 [inline] shrink_lruvec+0x661/0x12f0 mm/vmscan.c:2496 shrink_node_memcgs mm/vmscan.c:2685 [inline] shrink_node+0x401/0x1ad0 mm/vmscan.c:2791 shrink_zones mm/vmscan.c:2996 [inline] do_try_to_free_pages+0x3ba/0x14f0 mm/vmscan.c:3049 try_to_free_mem_cgroup_pages+0x30c/0xa70 mm/vmscan.c:3371 try_charge+0x628/0x14d0 mm/memcontrol.c:2455 mem_cgroup_try_charge+0x136/0x590 mm/memcontrol.c:6404 __add_to_page_cache_locked+0x43f/0xec0 mm/filemap.c:866 add_to_page_cache_lru+0x1d8/0x790 mm/filemap.c:943 ext4_mpage_readpages+0x46d/0x2220 fs/ext4/readpage.c:247 ext4_readpages+0xe7/0x130 fs/ext4/inode.c:3244 read_pages+0x108/0x610 mm/readahead.c:126 __do_page_cache_readahead+0x4e0/0x5d0 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] ondemand_readahead+0x55c/0xd30 mm/readahead.c:492 page_cache_async_readahead mm/readahead.c:574 [inline] page_cache_async_readahead+0x437/0x7c0 mm/readahead.c:547 generic_file_buffered_read mm/filemap.c:2059 [inline] generic_file_read_iter+0x13c0/0x2cf0 mm/filemap.c:2324 ext4_file_read_iter fs/ext4/file.c:130 [inline] ext4_file_read_iter+0x1db/0x640 fs/ext4/file.c:113 call_read_iter include/linux/fs.h:1896 [inline] new_sync_read+0x4d7/0x800 fs/read_write.c:414 __vfs_read+0xe1/0x110 fs/read_write.c:427 integrity_kernel_read+0x157/0x210 security/integrity/iint.c:200 ima_calc_file_hash_tfm+0x2e3/0x3e0 security/integrity/ima/ima_crypto.c:360 ima_calc_file_shash security/integrity/ima/ima_crypto.c:389 [inline] ima_calc_file_hash+0x1aa/0x570 security/integrity/ima/ima_crypto.c:454 ima_collect_measurement+0x534/0x5f0 security/integrity/ima/ima_api.c:247 process_measurement+0xd45/0x1850 security/integrity/ima/ima_main.c:326 ima_file_check+0xc5/0x110 security/integrity/ima/ima_main.c:442 do_last fs/namei.c:3424 [inline] path_openat+0x1138/0x4500 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1110 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 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:00007f2c4d889c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c4d88a6d4 R13: 00000000004fdd5f R14: 00000000004deff0 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10502 jiffies! g32637 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29240 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352