On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> Just a head up. Repeatedly compiling kernels for a while would trigger
> endless soft-lockups since next-20200519 on both x86_64 and powerpc.
> .config are in,
Could be 90b5363acd47 ("sched: Clean up scheduler_ipi()"), although I've
not seen anything like that myself. Let me go have a look.
In as far as the logs are readable (they're a wrapped mess, please don't
do that!), they contain very little useful, as is typical with IPIs :/
> [ 1167.993773][ C1] WARNING: CPU: 1 PID: 0 at kernel/smp.c:127
> flush_smp_call_function_queue+0x1fa/0x2e0
> [ 1168.003333][ C1] Modules linked in: nls_iso8859_1 nls_cp437 vfat
> fat kvm_amd ses kvm enclosure dax_pmem irqbypass dax_pmem_core efivars
> acpi_cpufreq efivarfs ip_tables x_tables xfs sd_mod smartpqi
> scsi_transport_sas tg3 mlx5_core libphy firmware_class dm_mirror
> dm_region_hash dm_log dm_mod
> [ 1168.029492][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted
> 5.7.0-rc6-next-20200519 #1
> [ 1168.037665][ C1] Hardware name: HPE ProLiant DL385
> Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
> [ 1168.046978][ C1] RIP: 0010:flush_smp_call_function_queue+0x1fa/0x2e0
> [ 1168.053658][ C1] Code: 01 0f 87 c9 12 00 00 83 e3 01 0f 85 cc fe
> ff ff 48 c7 c7 c0 55 a9 8f c6 05 f6 86 cd 01 01 e8 de 09 ea ff 0f 0b
> e9 b2 fe ff ff <0f> 0b e9 52 ff ff ff 0f 0b e9 f2 fe ff ff 65 44 8b 25
> 10 52 3f 71
> [ 1168.073262][ C1] RSP: 0018:ffffc90000178918 EFLAGS: 00010046
> [ 1168.079253][ C1] RAX: 0000000000000000 RBX: ffff8888430c58f8
> RCX: ffffffff8ec26083
> [ 1168.087156][ C1] RDX: 0000000000000003 RSI: dffffc0000000000
> RDI: ffff8888430c58f8
> [ 1168.095054][ C1] RBP: ffffc900001789a8 R08: ffffed1108618cec
> R09: ffffed1108618cec
> [ 1168.102964][ C1] R10: ffff8888430c675b R11: 0000000000000000
> R12: ffff8888430c58e0
> [ 1168.110866][ C1] R13: ffffffff8eb30c40 R14: ffff8888430c5880
> R15: ffff8888430c58e0
> [ 1168.118767][ C1] FS: 0000000000000000(0000)
> GS:ffff888843080000(0000) knlGS:0000000000000000
> [ 1168.127628][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1168.134129][ C1] CR2: 000055b169604560 CR3: 0000000d08a14000
> CR4: 00000000003406e0
> [ 1168.142026][ C1] Call Trace:
> [ 1168.145206][ C1] <IRQ>
> [ 1168.147957][ C1] ? smp_call_on_cpu_callback+0xd0/0xd0
> [ 1168.153421][ C1] ? rcu_read_lock_sched_held+0xac/0xe0
> [ 1168.158880][ C1] ? rcu_read_lock_bh_held+0xc0/0xc0
> [ 1168.164076][ C1] generic_smp_call_function_single_interrupt+0x13/0x2b
> [ 1168.170938][ C1] smp_call_function_single_interrupt+0x157/0x4e0
> [ 1168.177278][ C1] ? smp_call_function_interrupt+0x4e0/0x4e0
> [ 1168.183172][ C1] ? interrupt_entry+0xe4/0xf0
> [ 1168.187846][ C1] ? trace_hardirqs_off_caller+0x8d/0x1f0
> [ 1168.193478][ C1] ? trace_hardirqs_on_caller+0x1f0/0x1f0
> [ 1168.199116][ C1] ? _nohz_idle_balance+0x221/0x360
> [ 1168.204228][ C1] ? trace_hardirqs_off_thunk+0x1a/0x1c
> [ 1168.209690][ C1] call_function_single_interrupt+0xf/0x20
