rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=12645, q=58) rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294977107-4294966606), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor3 R running task 22248 8694 5931 0x80000000 Call Trace: sched_show_task.cold.84+0x2b6/0x30a kernel/sched/core.c:5293 print_other_cpu_stall.cold.66+0x7dd/0x8bb kernel/rcu/tree.c:1286 check_cpu_stall kernel/rcu/tree.c:1415 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xfd7/0x13f0 kernel/rcu/tree.c:2506 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:101 Code: 5d c3 66 90 55 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 f8 62 82 7e 81 e2 00 01 1f 00 75 2b 8b 90 d8 12 00 00 <83> fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 RSP: 0018:ffff88018491f3a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8801834f0080 RBX: ffff880183029770 RCX: ffffffff83607ab4 RDX: 0000000000000002 RSI: ffffffff83607a37 RDI: 0000000000000004 RBP: ffff88018491f3a0 R08: ffff8801834f0080 R09: 43bdc1aacc7e9a1f R10: 1a6152865d17e5a3 R11: 04022268d2ec9b39 R12: 0000000000000008 R13: ffff8801babfbd78 R14: f102ff761fc46f5e R15: 0000000000000011 crypto_sha3_update+0x397/0x1170 crypto/sha3_generic.c:201 crypto_shash_update+0xcf/0x120 crypto/shash.c:116 shash_ahash_update+0xc4/0x140 crypto/shash.c:244 shash_async_update+0x19/0x20 crypto/shash.c:252 crypto_ahash_update include/crypto/hash.h:557 [inline] hash_sendpage+0x6f2/0xb40 crypto/algif_hash.c:173 kernel_sendpage+0x93/0xf0 net/socket.c:3330 sock_sendpage+0x8c/0xc0 net/socket.c:846 pipe_to_sendpage+0x2d0/0x400 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x38b/0x7c0 fs/splice.c:627 splice_from_pipe+0x1ec/0x340 fs/splice.c:662 generic_splice_sendpage+0x3c/0x50 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1018 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:973 do_splice_direct+0x2d4/0x420 fs/splice.c:1061 do_sendfile+0x62a/0xe20 fs/read_write.c:1439 __do_sys_sendfile64 fs/read_write.c:1494 [inline] __se_sys_sendfile64 fs/read_write.c:1486 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1486 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff1370adc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569 RDX: 0000000020000040 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0010000000000443 R11: 0000000000000246 R12: 00007ff1370ae6d4 R13: 00000000004c3741 R14: 00000000004d57a0 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10580 jiffies! g12645 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 23000 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934 rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 EXT4-fs warning (device sda1): ext4_group_add:1637: No reserved GDT blocks, can't resize EXT4-fs warning (device sda1): ext4_group_add:1637: No reserved GDT blocks, can't resize IPVS: ftp: loaded support on port[0] = 21 xprt_adjust_timeout: rq_timeout = 0! xprt_adjust_timeout: rq_timeout = 0! xprt_adjust_timeout: rq_timeout = 0! IPVS: ftp: loaded support on port[0] = 21 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0