crypto: BUG: spinlock recursion when doing iperf over ipsec with crypto hardware device

Corentin Labbe
2022-01-11T09:47:24Z

Hello

I work on adding crypto/engine support to my crypto driver sun4i-ss.
Selftests are passed but when doing iperf over ipsec I hit a spinlock recursion BUG.

This bug happen also against my sun8i-ce driver.
But this bug happen only on ARM (SoCs H3) and not on arm64 (SoCs H6, a64 tested) for it.

This is the full trace:
iperf 3.10.1
Linux buildroot 5.15.13-00003-g14f78eca130d #199 SMP Fri Jan 7 08:35:20 CET 2022 armv7l
Control connection MSS 1386
Time: Fri, 07 Jan 2022 08:52:27 GMT
Connecting to host ipsec.lava.local, port 5201
Cookie: ylt5ilt5n4jnw72qu2lik5njq63rfalkshz6
TCP MSS: 1386 (default)
[ 5] local 192.168.1.204 port 33828 connected to 192.168.1.40 port 5201
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks, omitting 0 seconds, 10 second test, tos 0
[ 44.412526] BUG: spinlock recursion on CPU#0, 1c15000.crypto-/111
[ 44.418674] lock: 0xc3f40268, .magic: dead4ead, .owner: 1c15000.crypto-/111, .owner_cpu: 0
[ 44.427040] CPU: 0 PID: 111 Comm: 1c15000.crypto- Not tainted 5.15.13-00003-g14f78eca130d #199
[ 44.435647] Hardware name: Allwinner sun8i Family
[ 44.440354] [<c010d7a0>] (unwind_backtrace) from [<c0109fa0>] (show_stack+0x10/0x14)
[ 44.448110] [<c0109fa0>] (show_stack) from [<c0857fc4>] (dump_stack_lvl+0x40/0x4c)
[ 44.455685] [<c0857fc4>] (dump_stack_lvl) from [<c016c5dc>] (do_raw_spin_lock+0x11c/0x120)
[ 44.463953] [<c016c5dc>] (do_raw_spin_lock) from [<c0809034>] (xfrm_input+0x17c/0x1304)
[ 44.471961] [<c0809034>] (xfrm_input) from [<c07f9804>] (xfrm4_esp_rcv+0x44/0x84)
[ 44.479451] [<c07f9804>] (xfrm4_esp_rcv) from [<c0794c58>] (ip_protocol_deliver_rcu+0x2c/0x2b8)
[ 44.488156] [<c0794c58>] (ip_protocol_deliver_rcu) from [<c0794f48>] (ip_local_deliver_finish+0x64/0x80)
[ 44.497636] [<c0794f48>] (ip_local_deliver_finish) from [<c0793f58>] (ip_sublist_rcv_finish+0x3c/0x50)
[ 44.506944] [<c0793f58>] (ip_sublist_rcv_finish) from [<c0794af8>] (ip_sublist_rcv+0x180/0x1a0)
[ 44.515645] [<c0794af8>] (ip_sublist_rcv) from [<c07952d8>] (ip_list_rcv+0xf0/0x110)
[ 44.523391] [<c07952d8>] (ip_list_rcv) from [<c0735f5c>] (__netif_receive_skb_list_core+0x194/0x1fc)
[ 44.532527] [<c0735f5c>] (__netif_receive_skb_list_core) from [<c07361b0>] (netif_receive_skb_list_internal+0x1ec/0x304)
[ 44.543394] [<c07361b0>] (netif_receive_skb_list_internal) from [<c0736ef0>] (napi_complete_done+0x130/0x1c8)
[ 44.553306] [<c0736ef0>] (napi_complete_done) from [<c05ab408>] (stmmac_napi_poll_rx+0xa7c/0xbd8)
[ 44.562182] [<c05ab408>] (stmmac_napi_poll_rx) from [<c0736fb0>] (__napi_poll+0x28/0x170)
[ 44.570359] [<c0736fb0>] (__napi_poll) from [<c0737364>] (net_rx_action+0xf0/0x278)
[ 44.578016] [<c0737364>] (net_rx_action) from [<c010126c>] (__do_softirq+0x104/0x29c)
[ 44.585848] [<c010126c>] (__do_softirq) from [<c01231ac>] (irq_exit+0xbc/0x100)
[ 44.593162] [<c01231ac>] (irq_exit) from [<c0174300>] (handle_domain_irq+0x60/0x78)
[ 44.600824] [<c0174300>] (handle_domain_irq) from [<c044000c>] (gic_handle_irq+0x7c/0x90)
[ 44.609007] [<c044000c>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)
[ 44.616491] Exception stack(0xc1b79e38 to 0xc1b79e80)
[ 44.621541] 9e20: c1c13c00 c0de5100
[ 44.629712] 9e40: c1b78000 00000002 c3f40240 ffffe000 ec010000 c1b78000 00000002 00000000
[ 44.637883] 9e60: c3f40268 c0de5100 c3c369c0 c1b79e88 c0809388 c080b9d4 a0000113 ffffffff
[ 44.646050] [<c0100afc>] (__irq_svc) from [<c080b9d4>] (xfrm_replay_advance+0x11c/0x3dc)
[ 44.654143] [<c080b9d4>] (xfrm_replay_advance) from [<c0809388>] (xfrm_input+0x4d0/0x1304)
[ 44.662408] [<c0809388>] (xfrm_input) from [<c03a3d88>] (crypto_finalize_request+0x5c/0xc4)
[ 44.670766] [<c03a3d88>] (crypto_finalize_request) from [<c06a0888>] (sun8i_ce_cipher_run+0x34/0x3c)
[ 44.679900] [<c06a0888>] (sun8i_ce_cipher_run) from [<c03a4264>] (crypto_pump_work+0x1a8/0x330)
[ 44.688600] [<c03a4264>] (crypto_pump_work) from [<c013e448>] (kthread_worker_fn+0xd8/0x220)
[ 44.697045] [<c013e448>] (kthread_worker_fn) from [<c013f708>] (kthread+0x15c/0x180)
[ 44.704793] [<c013f708>] (kthread) from [<c0100130>] (ret_from_fork+0x14/0x24)
[ 44.712017] Exception stack(0xc1b79fb0 to 0xc1b79ff8)
[ 44.717066] 9fa0: 00000000 00000000 00000000 00000000
[ 44.725237] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 44.733406] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.11 sec 1.11 MBytes 8.39 Mbits/sec 1 1.35 KBytes
[ 5] 1.11-2.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 46.438402] sched: RT throttling activated
[ 46.438402] sched: RT throttling activated
[ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 5] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0 1.35 KBytes
[ 65.398401] rcu: INFO: rcu_sched self-detected stall on CPU
[ 65.403987] rcu: 0-....: (2068 ticks this GP) idle=afd/1/0x40000004 softirq=3056/3057 fqs=1050
[ 65.412774] (t=2102 jiffies g=1437 q=434)
[ 65.416873] NMI backtrace for cpu 0
[ 65.420361] CPU: 0 PID: 111 Comm: 1c15000.crypto- Not tainted 5.15.13-00003-g14f78eca130d #199
[ 65.428965] Hardware name: Allwinner sun8i Family
[ 65.433669] [<c010d7a0>] (unwind_backtrace) from [<c0109fa0>] (show_stack+0x10/0x14)
[ 65.441424] [<c0109fa0>] (show_stack) from [<c0857fc4>] (dump_stack_lvl+0x40/0x4c)
[ 65.448998] [<c0857fc4>] (dump_stack_lvl) from [<c042dc1c>] (nmi_cpu_backtrace+0xdc/0x110)
[ 65.457267] [<c042dc1c>] (nmi_cpu_backtrace) from [<c042dd58>] (nmi_trigger_cpumask_backtrace+0x108/0x168)
[ 65.466918] [<c042dd58>] (nmi_trigger_cpumask_backtrace) from [<c0856bf8>] (rcu_dump_cpu_stacks+0x128/0x15c)
[ 65.476745] [<c0856bf8>] (rcu_dump_cpu_stacks) from [<c0188224>] (rcu_sched_clock_irq+0x798/0x950)
[ 65.485707] [<c0188224>] (rcu_sched_clock_irq) from [<c0193608>] (update_process_times+0x9c/0xd0)
[ 65.494581] [<c0193608>] (update_process_times) from [<c01a5b14>] (tick_sched_timer+0x7c/0xf0)
[ 65.503197] [<c01a5b14>] (tick_sched_timer) from [<c0193e3c>] (__hrtimer_run_queues+0x15c/0x218)
[ 65.511984] [<c0193e3c>] (__hrtimer_run_queues) from [<c0194efc>] (hrtimer_interrupt+0x124/0x2b0)
[ 65.520857] [<c0194efc>] (hrtimer_interrupt) from [<c06a552c>] (arch_timer_handler_phys+0x28/0x30)
[ 65.529820] [<c06a552c>] (arch_timer_handler_phys) from [<c017a654>] (handle_percpu_devid_irq+0x78/0x13c)
[ 65.539388] [<c017a654>] (handle_percpu_devid_irq) from [<c01742fc>] (handle_domain_irq+0x5c/0x78)
[ 65.548352] [<c01742fc>] (handle_domain_irq) from [<c044000c>] (gic_handle_irq+0x7c/0x90)
[ 65.556533] [<c044000c>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)
[ 65.564017] Exception stack(0xc1b79a30 to 0xc1b79a78)
[ 65.569067] 9a20: 00000000 00000000 000003dc 000003da
[ 65.577238] 9a40: c3f40268 ffffe000 00000000 c1b78000 00000002 00000000 c3f40268 c0de5100
[ 65.585408] 9a60: c0b496d0 c1b79a80 c016c5b0 c016c538 80000113 ffffffff
[ 65.592015] [<c0100afc>] (__irq_svc) from [<c016c538>] (do_raw_spin_lock+0x78/0x120)
[ 65.599759] [<c016c538>] (do_raw_spin_lock) from [<c0809034>] (xfrm_input+0x17c/0x1304)
[ 65.607765] [<c0809034>] (xfrm_input) from [<c07f9804>] (xfrm4_esp_rcv+0x44/0x84)
[ 65.615255] [<c07f9804>] (xfrm4_esp_rcv) from [<c0794c58>] (ip_protocol_deliver_rcu+0x2c/0x2b8)
[ 65.623960] [<c0794c58>] (ip_protocol_deliver_rcu) from [<c0794f48>] (ip_local_deliver_finish+0x64/0x80)
[ 65.633440] [<c0794f48>] (ip_local_deliver_finish) from [<c0793f58>] (ip_sublist_rcv_finish+0x3c/0x50)
[ 65.642747] [<c0793f58>] (ip_sublist_rcv_finish) from [<c0794af8>] (ip_sublist_rcv+0x180/0x1a0)
[ 65.651447] [<c0794af8>] (ip_sublist_rcv) from [<c07952d8>] (ip_list_rcv+0xf0/0x110)
[ 65.659193] [<c07952d8>] (ip_list_rcv) from [<c0735f5c>] (__netif_receive_skb_list_core+0x194/0x1fc)
[ 65.668329] [<c0735f5c>] (__netif_receive_skb_list_core) from [<c07361b0>] (netif_receive_skb_list_internal+0x1ec/0x304)
[ 65.679196] [<c07361b0>] (netif_receive_skb_list_internal) from [<c0736ef0>] (napi_complete_done+0x130/0x1c8)
[ 65.689108] [<c0736ef0>] (napi_complete_done) from [<c05ab408>] (stmmac_napi_poll_rx+0xa7c/0xbd8)
[ 65.697982] [<c05ab408>] (stmmac_napi_poll_rx) from [<c0736fb0>] (__napi_poll+0x28/0x170)
[ 65.706159] [<c0736fb0>] (__napi_poll) from [<c0737364>] (net_rx_action+0xf0/0x278)
[ 65.713816] [<c0737364>] (net_rx_action) from [<c010126c>] (__do_softirq+0x104/0x29c)
[ 65.721647] [<c010126c>] (__do_softirq) from [<c01231ac>] (irq_exit+0xbc/0x100)
[ 65.728960] [<c01231ac>] (irq_exit) from [<c0174300>] (handle_domain_irq+0x60/0x78)
[ 65.736620] [<c0174300>] (handle_domain_irq) from [<c044000c>] (gic_handle_irq+0x7c/0x90)
[ 65.744799] [<c044000c>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)
[ 65.752281] Exception stack(0xc1b79e38 to 0xc1b79e80)
[ 65.757329] 9e20: c1c13c00 c0de5100
[ 65.765500] 9e40: c1b78000 00000002 c3f40240 ffffe000 ec010000 c1b78000 00000002 00000000
[ 65.773671] 9e60: c3f40268 c0de5100 c3c369c0 c1b79e88 c0809388 c080b9d4 a0000113 ffffffff
[ 65.781837] [<c0100afc>] (__irq_svc) from [<c080b9d4>] (xfrm_replay_advance+0x11c/0x3dc)
[ 65.789929] [<c080b9d4>] (xfrm_replay_advance) from [<c0809388>] (xfrm_input+0x4d0/0x1304)
[ 65.798196] [<c0809388>] (xfrm_input) from [<c03a3d88>] (crypto_finalize_request+0x5c/0xc4)
[ 65.806552] [<c03a3d88>] (crypto_finalize_request) from [<c06a0888>] (sun8i_ce_cipher_run+0x34/0x3c)
[ 65.815686] [<c06a0888>] (sun8i_ce_cipher_run) from [<c03a4264>] (crypto_pump_work+0x1a8/0x330)
[ 65.824384] [<c03a4264>] (crypto_pump_work) from [<c013e448>] (kthread_worker_fn+0xd8/0x220)
[ 65.832827] [<c013e448>] (kthread_worker_fn) from [<c013f708>] (kthread+0x15c/0x180)
[ 65.840574] [<c013f708>] (kthread) from [<c0100130>] (ret_from_fork+0x14/0x24)
[ 65.847799] Exception stack(0xc1b79fb0 to 0xc1b79ff8)
[ 65.852847] 9fa0: 00000000 00000000 00000000 00000000
[ 65.861017] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 65.869186] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 128.458402] rcu: INFO: rcu_sched self-detected stall on CPU
[ 128.463984] rcu: 0-....: (8328 ticks this GP) idle=afd/1/0x40000004 softirq=3056/3057 fqs=3872
[ 128.472769] (t=8408 jiffies g=1437 q=435)
[ 128.476867] NMI backtrace for cpu 0
[ 128.480354] CPU: 0 PID: 111 Comm: 1c15000.crypto- Not tainted 5.15.13-00003-g14f78eca130d #199
[ 128.488958] Hardware name: Allwinner sun8i Family
[ 128.493660] [<c010d7a0>] (unwind_backtrace) from [<c0109fa0>] (show_stack+0x10/0x14)
[ 128.501413] [<c0109fa0>] (show_stack) from [<c0857fc4>] (dump_stack_lvl+0x40/0x4c)
[ 128.508985] [<c0857fc4>] (dump_stack_lvl) from [<c042dc1c>] (nmi_cpu_backtrace+0xdc/0x110)
[ 128.517252] [<c042dc1c>] (nmi_cpu_backtrace) from [<c042dd58>] (nmi_trigger_cpumask_backtrace+0x108/0x168)
[ 128.526904] [<c042dd58>] (nmi_trigger_cpumask_backtrace) from [<c0856bf8>] (rcu_dump_cpu_stacks+0x128/0x15c)
[ 128.536730] [<c0856bf8>] (rcu_dump_cpu_stacks) from [<c0188224>] (rcu_sched_clock_irq+0x798/0x950)
[ 128.545691] [<c0188224>] (rcu_sched_clock_irq) from [<c0193608>] (update_process_times+0x9c/0xd0)
[ 128.554564] [<c0193608>] (update_process_times) from [<c01a5b14>] (tick_sched_timer+0x7c/0xf0)
[ 128.563179] [<c01a5b14>] (tick_sched_timer) from [<c0193e3c>] (__hrtimer_run_queues+0x15c/0x218)
[ 128.571966] [<c0193e3c>] (__hrtimer_run_queues) from [<c0194efc>] (hrtimer_interrupt+0x124/0x2b0)
[ 128.580838] [<c0194efc>] (hrtimer_interrupt) from [<c06a552c>] (arch_timer_handler_phys+0x28/0x30)
[ 128.589800] [<c06a552c>] (arch_timer_handler_phys) from [<c017a654>] (handle_percpu_devid_irq+0x78/0x13c)
[ 128.599369] [<c017a654>] (handle_percpu_devid_irq) from [<c01742fc>] (handle_domain_irq+0x5c/0x78)
[ 128.608332] [<c01742fc>] (handle_domain_irq) from [<c044000c>] (gic_handle_irq+0x7c/0x90)
[ 128.616514] [<c044000c>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)
[ 128.623997] Exception stack(0xc1b79a30 to 0xc1b79a78)
[ 128.629047] 9a20: 00000000 00000000 000003dc 000003da
[ 128.637218] 9a40: c3f40268 ffffe000 00000000 c1b78000 00000002 00000000 c3f40268 c0de5100
[ 128.645388] 9a60: c0b496d0 c1b79a80 c016c5b0 c016c538 80000113 ffffffff
[ 128.651995] [<c0100afc>] (__irq_svc) from [<c016c538>] (do_raw_spin_lock+0x78/0x120)
[ 128.659738] [<c016c538>] (do_raw_spin_lock) from [<c0809034>] (xfrm_input+0x17c/0x1304)
[ 128.667744] [<c0809034>] (xfrm_input) from [<c07f9804>] (xfrm4_esp_rcv+0x44/0x84)
[ 128.675233] [<c07f9804>] (xfrm4_esp_rcv) from [<c0794c58>] (ip_protocol_deliver_rcu+0x2c/0x2b8)
[ 128.683936] [<c0794c58>] (ip_protocol_deliver_rcu) from [<c0794f48>] (ip_local_deliver_finish+0x64/0x80)
[ 128.693408] [<c0794f48>] (ip_local_deliver_finish) from [<c0793f58>] (ip_sublist_rcv_finish+0x3c/0x50)
[ 128.702716] [<c0793f58>] (ip_sublist_rcv_finish) from [<c0794af8>] (ip_sublist_rcv+0x180/0x1a0)
[ 128.711417] [<c0794af8>] (ip_sublist_rcv) from [<c07952d8>] (ip_list_rcv+0xf0/0x110)
[ 128.719163] [<c07952d8>] (ip_list_rcv) from [<c0735f5c>] (__netif_receive_skb_list_core+0x194/0x1fc)
[ 128.728299] [<c0735f5c>] (__netif_receive_skb_list_core) from [<c07361b0>] (netif_receive_skb_list_internal+0x1ec/0x304)
[ 128.739165] [<c07361b0>] (netif_receive_skb_list_internal) from [<c0736ef0>] (napi_complete_done+0x130/0x1c8)
[ 128.749077] [<c0736ef0>] (napi_complete_done) from [<c05ab408>] (stmmac_napi_poll_rx+0xa7c/0xbd8)
[ 128.757951] [<c05ab408>] (stmmac_napi_poll_rx) from [<c0736fb0>] (__napi_poll+0x28/0x170)
[ 128.766129] [<c0736fb0>] (__napi_poll) from [<c0737364>] (net_rx_action+0xf0/0x278)
[ 128.773786] [<c0737364>] (net_rx_action) from [<c010126c>] (__do_softirq+0x104/0x29c)
[ 128.781617] [<c010126c>] (__do_softirq) from [<c01231ac>] (irq_exit+0xbc/0x100)
[ 128.788930] [<c01231ac>] (irq_exit) from [<c0174300>] (handle_domain_irq+0x60/0x78)
[ 128.796589] [<c0174300>] (handle_domain_irq) from [<c044000c>] (gic_handle_irq+0x7c/0x90)
[ 128.804768] [<c044000c>] (gic_handle_irq) from [<c0100afc>] (__irq_svc+0x5c/0x78)
[ 128.812250] Exception stack(0xc1b79e38 to 0xc1b79e80)
[ 128.817298] 9e20: c1c13c00 c0de5100
[ 128.825469] 9e40: c1b78000 00000002 c3f40240 ffffe000 ec010000 c1b78000 00000002 00000000
[ 128.833640] 9e60: c3f40268 c0de5100 c3c369c0 c1b79e88 c0809388 c080b9d4 a0000113 ffffffff
[ 128.841806] [<c0100afc>] (__irq_svc) from [<c080b9d4>] (xfrm_replay_advance+0x11c/0x3dc)
[ 128.849898] [<c080b9d4>] (xfrm_replay_advance) from [<c0809388>] (xfrm_input+0x4d0/0x1304)
[ 128.858163] [<c0809388>] (xfrm_input) from [<c03a3d88>] (crypto_finalize_request+0x5c/0xc4)
[ 128.866518] [<c03a3d88>] (crypto_finalize_request) from [<c06a0888>] (sun8i_ce_cipher_run+0x34/0x3c)
[ 128.875651] [<c06a0888>] (sun8i_ce_cipher_run) from [<c03a4264>] (crypto_pump_work+0x1a8/0x330)
[ 128.884349] [<c03a4264>] (crypto_pump_work) from [<c013e448>] (kthread_worker_fn+0xd8/0x220)
[ 128.892790] [<c013e448>] (kthread_worker_fn) from [<c013f708>] (kthread+0x15c/0x180)
[ 128.900537] [<c013f708>] (kthread) from [<c0100130>] (ret_from_fork+0x14/0x24)
[ 128.907760] Exception stack(0xc1b79fb0 to 0xc1b79ff8)
[ 128.912809] 9fa0: 00000000 00000000 00000000 00000000
[ 128.920978] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 128.929147] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000

None on my drivers are using spinlock so the only one which remains is crypto/engine one (queue_lock)

I have started to bisect this, but this lead to unrelated commits. (I tried twice with different starting point)

Known broken version are
5.13 5.14 5.15.13 next-20220105 5.10
I randomly hit also "NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!".
On 5.6 and 5.7 I got: NOHZ: local_softirq_pending 08

Working version are 5.4.170 and 5.5

The normal iperf performance is at least 30Mbit/s, when bug is present, iperf never end.
But When the bug is present with "NOHZ: local_softirq_pending 08", iperf give 1Mbit/s.

I started also to test other crypto driver which use the crypto/crypto_engine
On my sun8i-ss, no kernel trace are given, but iperf performance decrease is present.
I also tested omap-aes and it seems un-impacted.

Any help to debug that is welcome.
Thanks in advance

Regards