rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=7401, q=545) rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294955623-4294945123), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 21272 8539 8495 0x80004002 Call Trace: sched_show_task.cold.99+0x2ee/0x35d kernel/sched/core.c:5952 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline] check_cpu_stall kernel/rcu/tree_stall.h:558 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq.cold.86+0xb55/0xc8b kernel/rcu/tree.c:2276 update_process_times+0x23/0x50 kernel/time/timer.c:1726 tick_sched_handle+0x77/0x140 kernel/time/tick-sched.c:171 tick_sched_timer+0x43/0x100 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x32f/0xb50 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x163/0x5f0 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:loop1+0x2a0/0x892 Code: e3 4d 0f cd 04 45 31 e6 c4 63 7b f0 e2 02 41 31 cf c5 ed 72 d1 07 45 31 e6 41 89 d4 45 21 d4 45 01 ef c5 e5 72 f1 19 44 09 e6 <45> 01 f0 45 01 fb c5 e5 eb da c5 ed 72 d1 12 45 01 f8 41 01 f0 44 RSP: 0018:ffffc90002c87000 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 00000000228666ee RBX: 00000000cb0528da RCX: 0000000032072f86 RDX: 00000000c783e1d1 RSI: 00000000d5a1f1c1 RDI: 0000000000000000 RBP: ffffc90002c87290 R08: 0000000032a2dba0 R09: 00000000392459c5 R10: 00000000d5b1b389 R11: 00000000ccd78d8e R12: 00000000c581a181 R13: 00000000267d3e46 R14: 0000000070e98375 R15: 0000000038826810 sha256_avx2_update+0x10/0x20 arch/x86/crypto/sha256_ssse3_glue.c:236 crypto_shash_update+0xa0/0x120 crypto/shash.c:119 ima_calc_file_hash_tfm+0x260/0x360 security/integrity/ima/ima_crypto.c:371 ima_calc_file_shash security/integrity/ima/ima_crypto.c:391 [inline] ima_calc_file_hash+0x170/0x460 security/integrity/ima/ima_crypto.c:456 ima_collect_measurement+0x3f6/0x4f0 security/integrity/ima/ima_api.c:249 process_measurement+0x955/0x16f0 security/integrity/ima/ima_main.c:326 ima_file_check+0xc8/0x110 security/integrity/ima/ima_main.c:442 do_last fs/namei.c:3494 [inline] path_openat+0x949/0x2d40 fs/namei.c:3607 do_filp_open+0x171/0x240 fs/namei.c:3637 do_sys_openat2+0x2e0/0x510 fs/open.c:1146 do_sys_open+0x90/0xe0 fs/open.c:1162 ksys_open include/linux/syscalls.h:1386 [inline] __do_sys_open fs/open.c:1168 [inline] __se_sys_open fs/open.c:1166 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1166 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a9e9 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:00007fb3b86aac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a9e9 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb3b86ab6d4 R13: 00000000004fe41f R14: 00000000004df4a8 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10500 jiffies! g7401 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29360 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4080 schedule+0xc3/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x38b/0xad0 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline] rcu_gp_kthread+0x9f2/0x1890 kernel/rcu/tree.c:1818 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352