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* imx-uart DMA transaction error leading to OOPS on 4.14.95
@ 2019-02-06  8:13 Petr Štetiar
  2019-02-11 12:06 ` Vinod Koul
  0 siblings, 1 reply; 5+ messages in thread
From: Petr Štetiar @ 2019-02-06  8:13 UTC (permalink / raw)
  To: dmaengine; +Cc: linux-arm-kernel

Hi,

I've just encountered following OOPS on 4.14.95:

  imx-uart 21f0000.serial: DMA transaction error.
  Unable to handle kernel paging request at virtual address a0ee501a
  pgd = 9d7d4000
  [a0ee501a] *pgd=2d8d1811, *pte=00000000, *ppte=00000000
  Internal error: Oops: 7 [#1] SMP ARM
  Modules linked in: ath9k ath9k_htc ath9k_common qcserial ath9k_hw ath usb_wwan ti_usb_3410_5052 qmi_wwan pl2303 mac80211 keyspan iptable_nat iptable_mangle iptable_filter ipt_REJECT ipt_MASQUERADE ip_tables ftdi_sio cypress_m8 cp210x ch341 cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_FLOWOFFLOAD x_tables usbserial usbnet usblp spidev nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat_ftp nf_nat nf_log_ipv4 nf_log_common nf_flow_table_hw nf_flow_table nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack_ftp nf_conntrack lm75 lib80211_crypt_wep lib80211_crypt_tkip lib80211_crypt_ccmp lib80211 ezusb crc_itu_t crc_ccitt compat cdc_wdm cdc_acm evdev usb_f_acm u_serial
  libcomposite ledtrig_oneshot ledtrig_heartbeat pinctrl_mcp23s08 tun vfat fat configfs nls_utf8 nls_iso8859_2 nls_iso8859_1 nls_cp852 nls_cp850 nls_cp1250 eeprom_93cx6 gpio_keys usb_storage input_core leds_gpio sd_mod mii
  CPU: 0 PID: 2536 Comm: sh Not tainted 4.14.95 #0
  Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
  task: 9f67ca00 task.stack: 9b642000
  PC is at sdma_int_handler+0x7c/0x17c
  LR is at console_unlock+0x480/0x4ec
  pc : [<803e2690>]    lr : [<80158054>]    psr: 60000193
  sp : 9b643e70  ip : 00000003  fp : 9b643eac
  r10: 00000001  r9 : 9f56e010  r8 : 0000000c
  r7 : 00000000  r6 : 9f56e2ec  r5 : 00000003  r4 : 9f56e2e0
  r3 : a0ee5018  r2 : 00000018  r1 : 1f35f000  r0 : a0ee5000
  Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
  Control: 10c5387d  Table: 2d7d404a  DAC: 00000051
  Process sh (pid: 2536, stack limit = 0x9b642210)
  Stack: (0x9b643e70 to 0x9b644000)
  3e60:                                     00080040 00000008 00000000 00000000
  3e80: 9b643eac 9f6bfe80 9f61e200 00000000 9b643efc 0000003d 9f61e200 8090babc
  3ea0: 9b643ef4 9b643eb0 8015a4f0 803e2620 00008124 9b643f00 00000000 80746dc4
  3ec0: 80746db0 80746d88 00000000 9f61e200 9f61e200 00000000 00000001 9f408000
  3ee0: f4001100 00000000 9b643f14 9b643ef8 8015a5e0 8015a498 00000000 00000000
  3f00: 9f61e200 9f61e264 9b643f34 9b643f18 8015a668 8015a5c8 9f61e200 80907fc0
  3f20: 00000000 00000001 9b643f4c 9b643f38 8015df40 8015a628 8085bad4 00000000
  3f40: 9b643f5c 9b643f50 80159774 8015de6c 9b643f84 9b643f60 80159d3c 80159754
  3f60: 80903e28 80912da8 f400010c f4000100 9b643fb0 f4001100 9b643fac 9b643f88
  3f80: 80101454 80159ca8 00054574 40000010 ffffffff 10c5387d 10c5387d 00087bb0
  3fa0: 00000000 9b643fb0 8010c654 801013fc 0085eba4 0000000a 00000000 00000000
  3fc0: 0000000a 0085eba4 76f9b200 00000000 00087c44 00087bb0 00000000 0085f398
  3fe0: 0085f384 7ece9608 00054b28 00054574 40000010 ffffffff 00000000 00000000
  Backtrace:
  [<803e2614>] (sdma_int_handler) from [<8015a4f0>] (__handle_irq_event_percpu+0x64/0x130)
  r10:8090babc r9:9f61e200 r8:0000003d r7:9b643efc r6:00000000 r5:9f61e200
  r4:9f6bfe80
  [<8015a48c>] (__handle_irq_event_percpu) from [<8015a5e0>] (handle_irq_event_percpu+0x24/0x60)
  r10:00000000 r9:f4001100 r8:9f408000 r7:00000001 r6:00000000 r5:9f61e200
  r4:9f61e200
  [<8015a5bc>] (handle_irq_event_percpu) from [<8015a668>] (handle_irq_event+0x4c/0x70)
  r5:9f61e264 r4:9f61e200
  [<8015a61c>] (handle_irq_event) from [<8015df40>] (handle_fasteoi_irq+0xe0/0x17c)
  r7:00000001 r6:00000000 r5:80907fc0 r4:9f61e200
  [<8015de60>] (handle_fasteoi_irq) from [<80159774>] (generic_handle_irq+0x2c/0x3c)
  r5:00000000 r4:8085bad4
  [<80159748>] (generic_handle_irq) from [<80159d3c>] (__handle_domain_irq+0xa0/0xb4)
  [<80159c9c>] (__handle_domain_irq) from [<80101454>] (gic_handle_irq+0x64/0x98)
  r9:f4001100 r8:9b643fb0 r7:f4000100 r6:f400010c r5:80912da8 r4:80903e28
  [<801013f0>] (gic_handle_irq) from [<8010c654>] (__irq_usr+0x54/0x80)
  Exception stack(0x9b643fb0 to 0x9b643ff8)
  3fa0:                                     0085eba4 0000000a 00000000 00000000
  3fc0: 0000000a 0085eba4 76f9b200 00000000 00087c44 00087bb0 00000000 0085f398
  3fe0: 0085f384 7ece9608 00054b28 00054574 40000010 ffffffff
  r9:00087bb0 r8:10c5387d r7:10c5387d r6:ffffffff r5:40000010 r4:00054574
  Code: e3a0c003 e5940038 e0020298 e0803002 (e5d31002)
  ---[ end trace 3895211c674c9887 ]---
  Kernel panic - not syncing: Fatal exception in interrupt
  CPU1: stopping
  CPU: 1 PID: 0 Comm: swapper/1 Tainted: G      D         4.14.95 #0
  Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
  Backtrace:
  [<8010b3e8>] (dump_backtrace) from [<8010b6c0>] (show_stack+0x18/0x1c)
  r7:00000001 r6:60000193 r5:00000000 r4:80930c5c
  [<8010b6a8>] (show_stack) from [<8064e290>] (dump_stack+0x90/0xa4)
  [<8064e200>] (dump_stack) from [<8010e528>] (handle_IPI+0xec/0x194)
  r7:00000001 r6:00000000 r5:9f475f38 r4:80931738
  [<8010e43c>] (handle_IPI) from [<80101484>] (gic_handle_irq+0x94/0x98)
  r7:f4000100 r6:f400010c r5:80912da8 r4:80903e28
  [<801013f0>] (gic_handle_irq) from [<8010c28c>] (__irq_svc+0x6c/0x90)
  Exception stack(0x9f475f38 to 0x9f475f80)
  5f20:                                                       00000000 00eadc48
  5f40: 1f36e000 80114780 ffffe000 80903c30 80903be4 8090b6ba 807461e4 412fc09a
  5f60: 00000000 9f475f94 9f475f98 9f475f88 80108668 8010866c 60000013 ffffffff
  r9:9f474000 r8:807461e4 r7:9f475f6c r6:ffffffff r5:60000013 r4:8010866c
  [<80108630>] (arch_cpu_idle) from [<80667750>] (default_idle_call+0x30/0x34)
  [<80667720>] (default_idle_call) from [<8014f5e4>] (do_idle+0xc0/0x124)
  [<8014f524>] (do_idle) from [<8014f8b0>] (cpu_startup_entry+0x20/0x24)
  r9:412fc09a r8:1000406a r7:80931748 r6:10c0387d r5:00000001 r4:00000084
  [<8014f890>] (cpu_startup_entry) from [<8010e1b8>] (secondary_start_kernel+0x154/0x160)
  [<8010e064>] (secondary_start_kernel) from [<1010178c>] (0x1010178c)
  r5:00000051 r4:2f46806a
  Rebooting in 3 seconds..

It has happened during the system shutdown phase (after OpenWrt system
upgrade), and I've tried to trigger it for few more times with the same steps,
but I wasn't able to reproduce it anymore.

Please keep me in the Cc loop as I'm not subscribed to the mailing lists.

Thanks.

-- ynezz

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-- links below jump to the message on this page --
2019-02-06  8:13 imx-uart DMA transaction error leading to OOPS on 4.14.95 Petr Štetiar
2019-02-11 12:06 ` Vinod Koul
2019-02-11  9:28   ` Petr Štetiar
2019-02-12  3:42     ` Robin Gong
2019-02-12  6:39       ` Robin Gong

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