It could take a long time in the loop of acpi_ns_walk_namespace() on large systems due to there are many nodes in ACPI namespace, and then trigger a soft-lockup. Fix it by adding cond_resched() within the loop. [ 70.533393] watchdog: BUG: soft lockup - CPU#25 stuck for 22s! [swapper/0:1] [ 70.533438] Modules linked in: [ 70.533468] irq event stamp: 26257732 [ 70.533489] hardirqs last enabled at (26257731): [<ffffa000106f2e88>] __slab_alloc+0xa8/0xc8 [ 70.533505] hardirqs last disabled at (26257732): [<ffffa0001017387c>] el1_irq+0x7c/0x140 el1_irq at arch/arm64/kernel/entry.S:650 [ 70.533520] softirqs last enabled at (26197382): [<ffffa00010171a90>] efi_header_end+0xa90/0x10bc [ 70.533535] softirqs last disabled at (26197377): [<ffffa0001024a63c>] irq_exit+0x2c4/0x348 [ 70.533551] CPU: 25 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc7-next-20200929 #1 [ 70.533563] Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.15 05/08/2020 [ 70.533577] pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--) [ 70.533593] pc : arch_local_irq_restore+0x4/0x8 [ 70.533605] lr : __slab_alloc+0xb0/0xc8 [ 70.533617] sp : ffff000005bd61a0 [ 70.533628] x29: ffff000005bd61a0 x28: 000000000000000e [ 70.533653] x27: ffff0087b41c8ff8 x26: 0080000000000000 [ 70.533677] x25: ffffa000190db000 x24: ffff000e788d6c10 [ 70.533700] x23: ffffa00010cb41c8 x22: 00000000ffffffff [ 70.533723] x21: 0000000000012b20 x20: ffff0087b41cde10 [ 70.533746] x19: 0000000000000000 x18: 1fffe001cf1193ca [ 70.533768] x17: 0000000000000000 x16: 0000000000000000 [ 70.533791] x15: 0000000000071ccc x14: 0000000000071ccc [ 70.533813] x13: ffff800000b7ac1d x12: 1fffe00000b7ac1c [ 70.533836] x11: 1fffe00000b7ac1c x10: ffff800000b7ac1c [ 70.533859] x9 : dfffa00000000000 x8 : ffff000005bd60e7 [ 70.533882] x7 : 00000000f2000000 x6 : dfffa00000000000 [ 70.533904] x5 : 00000000f2f2f200 x4 : 00000000f2f2f2f2 [ 70.533927] x3 : 1fffe00000b6ddca x2 : ffffa00019bf2000 [ 70.533950] x1 : 000000000190a943 x0 : 0000000000000000 [ 70.533973] Call trace: [ 70.533987] arch_local_irq_restore+0x4/0x8 [ 70.534000] kmem_cache_alloc+0x35c/0x3c0 [ 70.534015] fill_pool+0x278/0x588 [ 70.534028] __debug_object_init+0x8c/0x1100 [ 70.534041] debug_object_activate+0x234/0x448 [ 70.534055] call_rcu+0x38/0x630 [ 70.534070] put_object+0x84/0xc0 [ 70.534082] __delete_object+0xc4/0x110 [ 70.534095] delete_object_full+0x18/0x20 [ 70.534110] kmemleak_free+0x2c/0x38 [ 70.534122] slab_free_freelist_hook+0x15c/0x240 [ 70.534135] kmem_cache_free+0x10c/0x518 [ 70.534150] acpi_os_release_object+0xc/0x18 [ 70.534165] acpi_ut_delete_object_desc+0xa8/0xac [ 70.534177] acpi_ut_update_ref_count.part.2+0x33c/0x788 [ 70.534190] acpi_ut_update_object_reference+0x304/0x42c [ 70.534203] acpi_ut_remove_reference+0x64/0x74 [ 70.534218] acpi_ds_store_object_to_local+0x2d8/0x300 [ 70.534231] acpi_ex_store+0x600/0x658 [ 70.534244] acpi_ex_opcode_1A_0T_1R+0x3e4/0xb34 [ 70.534257] acpi_ds_exec_end_op+0x338/0xad0 [ 70.534270] acpi_ps_parse_loop+0xdb4/0x1020 [ 70.534282] acpi_ps_parse_aml+0x1f0/0x614 [ 70.534295] acpi_ps_execute_method+0x500/0x508 [ 70.534308] acpi_ns_evaluate+0x680/0x7b4 [ 70.534320] acpi_ut_evaluate_object+0xc4/0x30c [ 70.534333] acpi_rs_get_method_data+0x84/0xd8 [ 70.534345] acpi_walk_resources+0x13c/0x17c [ 70.534359] __acpi_dev_get_resources+0x150/0x1d8 [ 70.534371] acpi_dev_get_resources+0x14/0x20 [ 70.534384] acpi_init_device_object+0x698/0x10b8 [ 70.534396] acpi_add_single_object+0xf8/0x1028 [ 70.534408] acpi_bus_check_add+0x160/0x3f8 [ 70.534421] acpi_ns_walk_namespace+0x1f4/0x298 [ 70.534433] acpi_walk_namespace+0xa4/0xe8 [ 70.534446] acpi_bus_scan+0xe0/0xf0 [ 70.534460] acpi_scan_init+0x218/0x51c [ 70.534472] acpi_init+0x45c/0x4e4 [ 70.534485] do_one_initcall+0x168/0xb60 [ 70.534498] kernel_init_freeable+0x698/0x724 [ 70.534511] kernel_init+0x10/0x11c [ 70.534524] ret_from_fork+0x10/0x18 [ 113.641710] rcu: INFO: rcu_sched self-detected stall on CPU [ 113.641774] rcu: 25-....: (6495 ticks this GP) idle=cbe/1/0x4000000000000002 softirq=772/772 fqs=3246 [ 113.641842] (t=6500 jiffies g=309 q=1185230) [ 113.641852] Task dump for CPU 25: [ 113.641872] task:swapper/0 state:R running task stack:22624 pid: 1 ppid: 0 flags:0x0000002a [ 113.641907] Call trace: [ 113.641927] dump_backtrace+0x0/0x398 [ 113.641941] show_stack+0x14/0x60 [ 113.641956] sched_show_task.part.94+0x358/0x374 [ 113.641970] sched_show_task+0x13c/0x1c0 [ 113.641983] dump_cpu_task+0x80/0x90 [ 113.641996] rcu_dump_cpu_stacks+0x1ac/0x1f8 [ 113.642012] rcu_sched_clock_irq+0x1d94/0x2048 [ 113.642027] update_process_times+0x30/0x1b8 [ 113.642041] tick_periodic+0x6c/0x310 [ 113.642054] tick_handle_periodic+0x70/0x140 [ 113.642070] arch_timer_handler_phys+0x48/0x68 [ 113.642084] handle_percpu_devid_irq+0x234/0xc08 [ 113.642099] generic_handle_irq+0x74/0xa0 [ 113.642112] __handle_domain_irq+0x98/0x158 [ 113.642126] gic_handle_irq+0xd0/0x158 [ 113.642139] el1_irq+0xbc/0x140 [ 113.642154] arch_local_irq_restore+0x4/0x8 [ 113.642167] kmem_cache_alloc+0x35c/0x3c0 [ 113.642182] acpi_os_acquire_object+0x28/0x30 [ 113.642195] acpi_ps_alloc_op+0x98/0x1d4 [ 113.642208] acpi_ps_create_op+0x374/0x86c [ 113.642221] acpi_ps_parse_loop+0x3f4/0x1020 [ 113.642233] acpi_ps_parse_aml+0x1f0/0x614 [ 113.642246] acpi_ps_execute_method+0x500/0x508 [ 113.642258] acpi_ns_evaluate+0x680/0x7b4 [ 113.642273] acpi_ut_evaluate_object+0xc4/0x30c [ 113.642286] acpi_rs_get_method_data+0x84/0xd8 [ 113.642298] acpi_walk_resources+0x13c/0x17c [ 113.642313] __acpi_dev_get_resources+0x150/0x1d8 [ 113.642325] acpi_dev_get_resources+0x14/0x20 [ 113.642338] acpi_init_device_object+0x698/0x10b8 [ 113.642351] acpi_add_single_object+0xf8/0x1028 [ 113.642363] acpi_bus_check_add+0x160/0x3f8 acpi_bus_check_add at drivers/acpi/scan.c:1885 [ 113.642376] acpi_ns_walk_namespace+0x1f4/0x298 acpi_ns_walk_namespace at drivers/acpi/acpica/nswalk.c:237 [ 113.642389] acpi_walk_namespace+0xa4/0xe8 [ 113.642401] acpi_bus_scan+0xe0/0xf0 [ 113.642416] acpi_scan_init+0x218/0x51c [ 113.642428] acpi_init+0x45c/0x4e4 [ 113.642441] do_one_initcall+0x168/0xb60 [ 113.642455] kernel_init_freeable+0x698/0x724 [ 113.642469] kernel_init+0x10/0x11c [ 113.642481] ret_from_fork+0x10/0x18 [ 128.674020] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7f]) Signed-off-by: Qian Cai <cai@xxxxxxxxxx> --- drivers/acpi/acpica/nswalk.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/acpi/acpica/nswalk.c b/drivers/acpi/acpica/nswalk.c index b7f3e8603ad8..216bf9e5a96e 100644 --- a/drivers/acpi/acpica/nswalk.c +++ b/drivers/acpi/acpica/nswalk.c @@ -267,6 +267,7 @@ acpi_ns_walk_namespace(acpi_object_type type, return_ACPI_STATUS(status); } + cond_resched(); } /* -- 2.18.4
