uClinux for the Blackfin Processor

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[#3679] Kernel crash for the serial driver in DMA mode

Submitted By: Vivi Li
Open Date 2007-11-07 03:38:17	Close Date 2007-11-22 20:04:53
Priority: Medium	Assignee: Sonic Zhang
Fixed In Release: N/A	Status: Closed
Found In Release: N/A	Release:
Category: N/A	Board: N/A
Processor: N/A	Silicon Revision:
Is this bug repeatable?: Yes	Resolution: Fixed
Uboot version or rev.:	Toolchain version or rev.: toolchain-2007_Oct_07_22_29
App binary format: N/A
Summary: Kernel crash for the serial driver in DMA mode
Details: Build kernel with Power management enabled. Please refer to kernel config below. Set SW 5.1 OFF to make the board can wake up from standby mode automatically. System continues to enter and exit 'standby' mode. Press keys on the serial console, then system will crash. Below is the kernel configuration for Power management: ------------------ Power Management support (PM) [Y/n/?] y Legacy Power Management API (DEPRECATED) (PM_LEGACY) [N/y/?] Power Management Debug Support (PM_DEBUG) [N/y/?] Driver model /sys/devices/.../power/state files (DEPRECATED) (PM_SYSFS_DEPRECATED) [N/y/?] Select PM Wakeup Event Source > 1. Specify Wakeup Event by SIC_IWR value (PM_WAKEUP_GPIO_BY_SIC_IWR) 2. Cause Wakeup Event by GPIO (PM_WAKEUP_BY_GPIO) 3. Configure Wakeup Event by PM GPIO API (PM_WAKEUP_GPIO_API) choice[1-3?]: 2 Wakeup GPIO number (PM_WAKEUP_GPIO_NUMBER) [2] (NEW) 2 GPIO Polarity > 1. Active High (PM_WAKEUP_GPIO_POLAR_H) (NEW) 2. Active Low (PM_WAKEUP_GPIO_POLAR_L) (NEW) 3. Falling EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_F) (NEW) 4. Rising EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_R) (NEW) 5. Both EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_B) (NEW) choice[1-5]: 1 Below is the steps: ------------------- root:~> while [ 1 ];echo 'standby' > /sys/power/state ;done Stopping tasks ... done. Suspending console(s) Restarting tasks ... done. Stopping tasks ... done. Suspending console(s) Restarting tasks ... done. Stopping tasks ... done. Suspending console(s) ##Now press keys on the serial console or hold keys down. Restarting tasks ... done. NULL pointer access (probably) Kernel or interrupt exception return address: [0x00091b8a]; contents of: 0x00091b60: SEQUENCER STATUS: SEQSTAT: 00000027 IPEND: c030 SYSCFG: 0006 RETE: <0x00000000> /* Maybe null pointer? / RETN: <0x001c7a40> / unknown address / RETX: <0x00091b8a> { _bfin_serial_dma_rx_chars + 0xfe } RETS: <0x00091f38> { _bfin_serial_rx_dma_timeout + 0x80 } DCPLB_FAULT_ADDR: <0x00000000> / Maybe null pointer? */ ICPLB_FAULT_ADDR: <0x00091b8a> { _bfin_serial_dma_rx_chars + 0xfe } PROCESSOR STATE: R0 : 00000000 R1 : 00000000 R2 : 00000001 R3 : 00000000 R4 : 00000001 R5 : 001c7a56 R6 : 00000000 R7 : 00000000 P0 : 0000000f P1 : 03283920 P2 : 00000000 P3 : 00156c0c P4 : 001c7aa8 P5 : 00000000 FP : 001c7a57 SP : 001c7964 LB0: ffa01cee LT0: ffa01cee LC0: 0000005e LB1: 0002a3bc LT1: 0002a3bc LC1: 00000000 B0 : 00000000 L0 : 00000000 M0 : 00000000 I0 : 00000001 B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 00000000 B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : ffff4747 B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 00000000 A0.w: 00000050 A0.x: 00000000 A1.w: 00000050 A1.x: 00000000 USP : 0066e8b0 ASTAT: 02002021 Hardware Trace: 0 Target : <0x000046a8> { _trap_c + 0x0 } Source : <0xffa00afc> { _exception_to_level5 + 0xb4 } 1 Target : <0xffa00a48> { _exception_to_level5 + 0x0 } Source : <0xffa009a0> { _ex_trap_c + 0x5c } 2 Target : <0xffa00944> { _ex_trap_c + 0x0 } Source : <0xffa0077c> { _ex_workaround_261 + 0x1c } 3 Target : <0xffa00760> { _ex_workaround_261 + 0x0 } Source : <0xffa00b9c> { _trap + 0x28 } 4 Target : <0xffa00b74> { _trap + 0x0 } Source : <0xffa008e6> { _return_from_exception + 0xe } 5 Target : <0xffa008d8> { _return_from_exception + 0x0 } Source : <0xffa00772> { _ex_workaround_261 + 0x12 } 6 Target : <0xffa00760> { _ex_workaround_261 + 0x0 } Source : <0xffa00b9c> { _trap + 0x28 } 7 Target : <0xffa00b74> { _trap + 0x0 } Source : <0x00091b88> { _bfin_serial_dma_rx_chars + 0xfc } 8 Target : <0x00091b7e> { _bfin_serial_dma_rx_chars + 0xf2 } Source : <0x00091b14> { _bfin_serial_dma_rx_chars + 0x88 } 9 Target : <0x00091b02> { _bfin_serial_dma_rx_chars + 0x76 } Source : <0x00091c00> { _bfin_serial_dma_rx_chars + 0x174 } 10 Target : <0x00091bf2> { _bfin_serial_dma_rx_chars + 0x166 } Source : <0x00091afe> { _bfin_serial_dma_rx_chars + 0x72 } 11 Target : <0x00091af8> { _bfin_serial_dma_rx_chars + 0x6c } Source : <0x00091af0> { _bfin_serial_dma_rx_chars + 0x64 } 12 Target : <0x00091aee> { _bfin_serial_dma_rx_chars + 0x62 } Source : <0x00091ae2> { _bfin_serial_dma_rx_chars + 0x56 } 13 Target : <0x00091ae0> { _bfin_serial_dma_rx_chars + 0x54 } Source : <0x00091ad4> { _bfin_serial_dma_rx_chars + 0x48 } 14 Target : <0x00091ad2> { _bfin_serial_dma_rx_chars + 0x46 }
Details: Build kernel with Power management enabled. Please refer to kernel config below. Set SW 5.1 OFF to make the board can wake up from standby mode automatically. System continues to enter and exit 'standby' mode. Press keys on the serial console, then system will crash. Below is the kernel configuration for Power management: ------------------ Power Management support (PM) [Y/n/?] y Legacy Power Management API (DEPRECATED) (PM_LEGACY) [N/y/?] Power Management Debug Support (PM_DEBUG) [N/y/?] Driver model /sys/devices/.../power/state files (DEPRECATED) (PM_SYSFS_DEPRECATED) [N/y/?] Select PM Wakeup Event Source > 1. Specify Wakeup Event by SIC_IWR value (PM_WAKEUP_GPIO_BY_SIC_IWR) 2. Cause Wakeup Event by GPIO (PM_WAKEUP_BY_GPIO) 3. Configure Wakeup Event by PM GPIO API (PM_WAKEUP_GPIO_API) choice[1-3?]: 2 Wakeup GPIO number (PM_WAKEUP_GPIO_NUMBER) [2] (NEW) 2 GPIO Polarity > 1. Active High (PM_WAKEUP_GPIO_POLAR_H) (NEW) 2. Active Low (PM_WAKEUP_GPIO_POLAR_L) (NEW) 3. Falling EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_F) (NEW) 4. Rising EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_R) (NEW) 5. Both EDGE (PM_WAKEUP_GPIO_POLAR_EDGE_B) (NEW) choice[1-5]: 1 Below is the steps: ------------------- root:~> while [ 1 ];echo 'standby' > /sys/power/state ;done Stopping tasks ... done. Suspending console(s) Restarting tasks ... done. Stopping tasks ... done. Suspending console(s) Restarting tasks ... done. Stopping tasks ... done. Suspending console(s) ##Now press keys on the serial console or hold keys down. Restarting tasks ... done. NULL pointer access (probably) Kernel or interrupt exception return address: [0x00091b8a]; contents of: 0x00091b60: SEQUENCER STATUS: SEQSTAT: 00000027 IPEND: c030 SYSCFG: 0006 RETE: <0x00000000> /* Maybe null pointer? / RETN: <0x001c7a40> / unknown address / RETX: <0x00091b8a> { _bfin_serial_dma_rx_chars + 0xfe } RETS: <0x00091f38> { _bfin_serial_rx_dma_timeout + 0x80 } DCPLB_FAULT_ADDR: <0x00000000> / Maybe null pointer? */ ICPLB_FAULT_ADDR: <0x00091b8a> { _bfin_serial_dma_rx_chars + 0xfe } PROCESSOR STATE: R0 : 00000000 R1 : 00000000 R2 : 00000001 R3 : 00000000 R4 : 00000001 R5 : 001c7a56 R6 : 00000000 R7 : 00000000 P0 : 0000000f P1 : 03283920 P2 : 00000000 P3 : 00156c0c P4 : 001c7aa8 P5 : 00000000 FP : 001c7a57 SP : 001c7964 LB0: ffa01cee LT0: ffa01cee LC0: 0000005e LB1: 0002a3bc LT1: 0002a3bc LC1: 00000000 B0 : 00000000 L0 : 00000000 M0 : 00000000 I0 : 00000001 B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 00000000 B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : ffff4747 B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 00000000 A0.w: 00000050 A0.x: 00000000 A1.w: 00000050 A1.x: 00000000 USP : 0066e8b0 ASTAT: 02002021 Hardware Trace: 0 Target : <0x000046a8> { _trap_c + 0x0 } Source : <0xffa00afc> { _exception_to_level5 + 0xb4 } 1 Target : <0xffa00a48> { _exception_to_level5 + 0x0 } Source : <0xffa009a0> { _ex_trap_c + 0x5c } 2 Target : <0xffa00944> { _ex_trap_c + 0x0 } Source : <0xffa0077c> { _ex_workaround_261 + 0x1c } 3 Target : <0xffa00760> { _ex_workaround_261 + 0x0 } Source : <0xffa00b9c> { _trap + 0x28 } 4 Target : <0xffa00b74> { _trap + 0x0 } Source : <0xffa008e6> { _return_from_exception + 0xe } 5 Target : <0xffa008d8> { _return_from_exception + 0x0 } Source : <0xffa00772> { _ex_workaround_261 + 0x12 } 6 Target : <0xffa00760> { _ex_workaround_261 + 0x0 } Source : <0xffa00b9c> { _trap + 0x28 } 7 Target : <0xffa00b74> { _trap + 0x0 } Source : <0x00091b88> { _bfin_serial_dma_rx_chars + 0xfc } 8 Target : <0x00091b7e> { _bfin_serial_dma_rx_chars + 0xf2 } Source : <0x00091b14> { _bfin_serial_dma_rx_chars + 0x88 } 9 Target : <0x00091b02> { _bfin_serial_dma_rx_chars + 0x76 } Source : <0x00091c00> { _bfin_serial_dma_rx_chars + 0x174 } 10 Target : <0x00091bf2> { _bfin_serial_dma_rx_chars + 0x166 } Source : <0x00091afe> { _bfin_serial_dma_rx_chars + 0x72 } 11 Target : <0x00091af8> { _bfin_serial_dma_rx_chars + 0x6c } Source : <0x00091af0> { _bfin_serial_dma_rx_chars + 0x64 } 12 Target : <0x00091aee> { _bfin_serial_dma_rx_chars + 0x62 } Source : <0x00091ae2> { _bfin_serial_dma_rx_chars + 0x56 } 13 Target : <0x00091ae0> { _bfin_serial_dma_rx_chars + 0x54 } Source : <0x00091ad4> { _bfin_serial_dma_rx_chars + 0x48 } 14 Target : <0x00091ad2> { _bfin_serial_dma_rx_chars + 0x46 }

Follow-ups
--- Sonic Zhang 2007-11-21 23:34:38 Free rx dma buffer in shutdown()
--- Vivi Li 2007-11-22 21:50:38 I have also checked with bug 3564, both bugs are ok. So close it.

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Change Date	User Id	Field Name	Old Value	New Value
2007-11-22 21:50:38	Vivi Li	status	Open	Closed
2007-11-22 21:50:38	Vivi Li	close_date	None	2007-11-23 01:04:53
2007-11-22 21:50:38	Vivi Li	assignee	Nobody	Removed
2007-11-21 23:34:38	Sonic Zhang	resolution18	None	Fixed

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