protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_0 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=293717, q=993) rcu: All QSes seen, last rcu_preempt kthread activity 10469 (4295138927-4295128458), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 25168 7764 27457 0x00000002 Call Trace: sched_show_task kernel/sched/core.c:5306 [inline] sched_show_task.cold+0x292/0x30b kernel/sched/core.c:5281 print_other_cpu_stall kernel/rcu/tree.c:1301 [inline] check_cpu_stall kernel/rcu/tree.c:1429 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks.cold+0xa10/0xa4a kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:blk_start_plug+0x10e/0x190 block/blk-core.c:1720 Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 04 3c 01 7e 7d 48 8d 7b 22 31 c0 48 89 fa 66 89 43 20 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 48 89 fa 83 RSP: 0018:ffff888017dbf0b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff888017dbf190 RCX: ffffc9000e66e000 RDX: ffff888017dbf1b2 RSI: ffffffff831681d9 RDI: ffff888017dbf1b2 RBP: ffff888017dbf0d0 R08: ffff888086c40400 R09: ffffed1014fcf435 R10: ffffed1014fcf434 R11: ffff8880a7e7a1a7 R12: ffff888086c40400 R13: ffff888017dbf1a0 R14: dffffc0000000000 R15: 0000000000000003 shrink_node_memcg+0x52a/0x1450 mm/vmscan.c:2527 shrink_node+0x29a/0x1540 mm/vmscan.c:2753 shrink_zones mm/vmscan.c:2987 [inline] do_try_to_free_pages+0x3cb/0x11e0 mm/vmscan.c:3049 try_to_free_mem_cgroup_pages+0x337/0x960 mm/vmscan.c:3353 try_charge+0x3d7/0x1570 mm/memcontrol.c:2234 mem_cgroup_try_charge+0x24d/0x5e0 mm/memcontrol.c:5913 mem_cgroup_try_charge_delay+0x1f/0xa0 mm/memcontrol.c:5928 shmem_getpage_gfp+0x69b/0x3520 mm/shmem.c:1790 shmem_getpage mm/shmem.c:134 [inline] shmem_write_begin+0x105/0x1e0 mm/shmem.c:2385 generic_perform_write+0x231/0x530 mm/filemap.c:3208 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 generic_file_write_iter+0x360/0x610 mm/filemap.c:3361 call_write_iter include/linux/fs.h:1863 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x613/0x8e0 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f985d681c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39 RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f985d6826d4 R13: 00000000004c7362 R14: 00000000004dce68 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10469 jiffies! g293717 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29024 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803 rcu_gp_fqs_loop kernel/rcu/tree.c:1948 [inline] rcu_gp_kthread+0x956/0x17a0 kernel/rcu/tree.c:2105 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352