Re: [PATCH] mm: nommu: per-thread vma cache fix

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On Tue, 2014-06-10 at 18:28 +0800, Steven Miao (Steven Miao) wrote:
> From: Steven Miao <realmz6@xxxxxxxxx>
> 
> mm could be removed from current task struct, using previous vma->vm_mm
> 
> It will crash on blackfin after updated to Linux 3.15. The commit "mm: per-thread vma caching" caused the crash.
> mm could be removed from current task struct before 
> mmput()->
> 	exit_mmap()->
> 		   delete_vma_from_mm()
> 
> the detailed booting log:
> 
> ## Booting kernel from Legacy Image at 01000000 ...
>    Image Name:   bf609-0.0-3.15.0-ADI-2014R1-pre-
>    Image Type:   Blackfin Linux Kernel Image (gzip compressed)
>    Data Size:    10293222 Bytes = 9.8 MiB
>    Load Address: 00001000
>    Entry Point:  002e796c
>    Verifying Checksum ... OK
>    Uncompressing Kernel Image ... OK
> Starting Kernel at = 002e796c
> Linux version 3.15.0-ADI-2014R1-pre-00345-gea9f446 (steven@steven-OptiPlex-390) (gcc version 4.3.5 (ADI-trunk/svn-5962) ) #25 Tue Jun 10 17:47:46 CST 2014
> register early platform devices
> bootconsole [early_shadow0] enabled
> ERROR: Not running on ADSP-BF609: unknown CPUID 0x0000 Rev 0.0
> bootconsole [early_BFuart0] enabled
> early printk enabled on early_BFuart0
> Board Memory: 128MB
> Kernel Managed Memory: 128MB
> Memory map:
>   fixedcode = 0x00000400-0x00000490
>   text      = 0x00001000-0x001fa910
>   rodata    = 0x001fa934-0x002a1ea8
>   bss       = 0x002a2000-0x002b9bc0
>   data      = 0x002b9bc0-0x002e4000
>     stack   = 0x002e2000-0x002e4000
>   init      = 0x002e4000-0x00b45000
>   available = 0x00b45000-0x07f00000
>   DMA Zone  = 0x07f00000-0x08000000
> Hardware Trace active and enabled
> Blackfin support (C) 2004-2010 Analog Devices, Inc.
> Compiled for ADSP-BF609 Rev 0.0
> Blackfin Linux support by http://blackfin.uclinux.org/
> Processor Speed: 500 MHz core clock, 125 MHz SCLk, 125 MHz SCLK0, 125 MHz SCLK1 and 250 MHz DCLK
> NOMPU: setting up cplb tables
> Instruction Cache Enabled for CPU0
>   External memory: cacheable in instruction cache
>   L2 SRAM        : uncacheable in instruction cache
> Data Cache Enabled for CPU0
>   External memory: cacheable (write-back) in data cache
>   L2 SRAM        : uncacheable in data cache
> Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 32258
> Kernel command line: root=/dev/mtdblock0 rw clkin_hz=(25000000) earlyprintk=serial,uart0,57600 console=ttyBF0,57600 ip=10.99.24.159:10.99.24.86:10.99.24.1:255.255.255.0:"bf609-ezkit":eth0:off
> PID hash table entries: 512 (order: -1, 2048 bytes)
> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> Memory: 117340K/130048K available (2022K kernel code, 169K rwdata, 669K rodata, 8580K init, 94K bss, 12708K reserved, 1024K DMA)
> NR_IRQS:291
> Configuring Blackfin Priority Driven Interrupts
> Console: colour dummy device 80x25
> Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
> pid_max: default: 32768 minimum: 301
> Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
> Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
> devtmpfs: initialized
> Blackfin Scratchpad data SRAM: 4 KB
> Blackfin L1 Data A SRAM: 16 KB (9 KB free)
> Blackfin L1 Data B SRAM: 16 KB (16 KB free)
> Blackfin L1 Instruction SRAM: 64 KB (49 KB free)
> Blackfin L2 SRAM: 256 KB (256 KB free)
> pinctrl core: initialized pinctrl subsystem
> NET: Registered protocol family 16
> Blackfin DMA Controller
> ezkit_init(): registering device resources
> SCSI subsystem initialized
> usbcore: registered new interface driver usbfs
> usbcore: registered new interface driver hub
> usbcore: registered new device driver usb
> i2c-bfin-twi i2c-bfin-twi.0: Blackfin on-chip I2C TWI Contoller, regs_base@ffc01e00
> i2c-bfin-twi i2c-bfin-twi.1: Blackfin on-chip I2C TWI Contoller, regs_base@ffc01f00
> pps_core: LinuxPPS API ver. 1 registered
> pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@xxxxxxxx>
> PTP clock support registered
> NET: Registered protocol family 23
> Switched to clocksource bfin_cs_cycles
> NET: Registered protocol family 2
> TCP established hash table entries: 1024 (order: 0, 4096 bytes)
> TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
> TCP: Hash tables configured (established 1024 bind 1024)
> TCP: reno registered
> UDP hash table entries: 256 (order: 0, 4096 bytes)
> UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
> NET: Registered protocol family 1
> msgmni has been set to 229
> io scheduler noop registered (default)
> bfin-uart: Blackfin serial driver
> bfin-uart.0: ttyBF0 at MMIO 0xffc02000 (irq = 88, base_baud = 7812500) is a BFIN-UART
> console [ttyBF0] enabled
> console [ttyBF0] enabled
> bootconsole [early_BFuart0] disabled
> bootconsole [early_BFuart0] disabled
> bootconsole [early_shadow0] disabled
> CAN device driver interface
> bfin_can bfin_can.0: bfin_can device registered(&reg_base=ffc00a00, rx_irq=47, tx_irq=48, err_irq=49, sclk=125000000)
> stmmaceth stmmaceth.0: no reset control found
> stmmac - user ID: 0x10, Synopsys ID: 0x36
>  Ring mode enabled
>  DMA HW capability register supported
>  Enhanced/Alternate descriptors
> 	Enabled extended descriptors
>  RX Checksum Offload Engine supported (type 2)
>  Wake-Up On Lan supported
>  Enable RX Mitigation via HW Watchdog Timer
> NULL pointer access
> Kernel OOPS in progress
> Deferred Exception context
> CURRENT PROCESS:
> COMM=modprobe PID=278  CPU=0
> invalid mm
> return address: [0x000531de]; contents of:
> 0x000531b0:  c727  acea  0c42  181d  0000  0000  0000  a0a8 
> 0x000531c0:  b090  acaa  0c42  1806  0000  0000  0000  a0e8 
> 0x000531d0:  b0d0  e801  0000  05b3  0010  e522  0046 [a090]
> 0x000531e0:  6408  b090  0c00  17cc  3042  e3ff  f37b  2fc8 
> 
> CPU: 0 PID: 278 Comm: modprobe Not tainted 3.15.0-ADI-2014R1-pre-00345-gea9f446 #25
> task: 0572b720 ti: 0569e000 task.ti: 0569e000
> Compiled for cpu family 0x27fe (Rev 0), but running on:0x0000 (Rev 0)
> ADSP-BF609-0.0 500(MHz CCLK) 125(MHz SCLK) (mpu off)
> Linux version 3.15.0-ADI-2014R1-pre-00345-gea9f446 (steven@steven-OptiPlex-390) (gcc version 4.3.5 (ADI-trunk/svn-5962) ) #25 Tue Jun 10 17:47:46 CST 2014
> 
> SEQUENCER STATUS:		Not tainted
>  SEQSTAT: 00000027  IPEND: 8008  IMASK: ffff  SYSCFG: 2806
>   EXCAUSE   : 0x27
>   physical IVG3 asserted : <0xffa00744> { _trap + 0x0 }
>   physical IVG15 asserted : <0xffa00d68> { _evt_system_call + 0x0 }
>   logical irq   6 mapped  : <0xffa003bc> { _bfin_coretmr_interrupt + 0x0 }
>   logical irq   7 mapped  : <0x00008828> { _bfin_fault_routine + 0x0 }
>   logical irq  11 mapped  : <0x00007724> { _l2_ecc_err + 0x0 }
>   logical irq  13 mapped  : <0x00008828> { _bfin_fault_routine + 0x0 }
>   logical irq  39 mapped  : <0x00150788> { _bfin_twi_interrupt_entry + 0x0 }
>   logical irq  40 mapped  : <0x00150788> { _bfin_twi_interrupt_entry + 0x0 }
>  RETE: <0x00000000> /* Maybe null pointer? */
>  RETN: <0x0569fe50> /* kernel dynamic memory (maybe user-space) */
>  RETX: <0x00000480> /* Maybe fixed code section */
>  RETS: <0x00053384> { _exit_mmap + 0x28 }
>  PC  : <0x000531de> { _delete_vma_from_mm + 0x92 }
> DCPLB_FAULT_ADDR: <0x00000008> /* Maybe null pointer? */
> ICPLB_FAULT_ADDR: <0x000531de> { _delete_vma_from_mm + 0x92 }
> PROCESSOR STATE:
>  R0 : 00000004    R1 : 0569e000    R2 : 00bf3db4    R3 : 00000000
>  R4 : 057f9800    R5 : 00000001    R6 : 0569ddd0    R7 : 0572b720
>  P0 : 0572b854    P1 : 00000004    P2 : 00000000    P3 : 0569dda0
>  P4 : 0572b720    P5 : 0566c368    FP : 0569fe5c    SP : 0569fd74
>  LB0: 057f523f    LT0: 057f523e    LC0: 00000000
>  LB1: 0005317c    LT1: 00053172    LC1: 00000002
>  B0 : 00000000    L0 : 00000000    M0 : 0566f5bc    I0 : 00000000
>  B1 : 00000000    L1 : 00000000    M1 : 00000000    I1 : ffffffff
>  B2 : 00000001    L2 : 00000000    M2 : 00000000    I2 : 00000000
>  B3 : 00000000    L3 : 00000000    M3 : 00000000    I3 : 057f8000
> A0.w: 00000000   A0.x: 00000000   A1.w: 00000000   A1.x: 00000000
> USP : 056ffcf8  ASTAT: 02003024
> 
> Hardware Trace:
>    0 Target : <0x00003fb8> { _trap_c + 0x0 }
>      Source : <0xffa006d8> { _exception_to_level5 + 0xa0 } JUMP.L
>    1 Target : <0xffa00638> { _exception_to_level5 + 0x0 }
>      Source : <0xffa004f2> { _bfin_return_from_exception + 0x6 } RTX
>    2 Target : <0xffa004ec> { _bfin_return_from_exception + 0x0 }
>      Source : <0xffa00590> { _ex_trap_c + 0x70 } JUMP.S
>    3 Target : <0xffa00520> { _ex_trap_c + 0x0 }
>      Source : <0xffa0076e> { _trap + 0x2a } JUMP (P4)
>    4 Target : <0xffa00744> { _trap + 0x0 }
>       FAULT : <0x000531de> { _delete_vma_from_mm + 0x92 } P0 = W[P2 + 2]
>      Source : <0x000531da> { _delete_vma_from_mm + 0x8e } P2 = [P4 + 0x18]
>    5 Target : <0x000531da> { _delete_vma_from_mm + 0x8e }
>      Source : <0x00053176> { _delete_vma_from_mm + 0x2a } IF CC JUMP pcrel 
>    6 Target : <0x0005314c> { _delete_vma_from_mm + 0x0 }
>      Source : <0x00053380> { _exit_mmap + 0x24 } JUMP.L
>    7 Target : <0x00053378> { _exit_mmap + 0x1c }
>      Source : <0x00053394> { _exit_mmap + 0x38 } IF !CC JUMP pcrel (BP)
>    8 Target : <0x00053390> { _exit_mmap + 0x34 }
>      Source : <0xffa020e0> { __cond_resched + 0x20 } RTS
>    9 Target : <0xffa020c0> { __cond_resched + 0x0 }
>      Source : <0x0005338c> { _exit_mmap + 0x30 } JUMP.L
>   10 Target : <0x0005338c> { _exit_mmap + 0x30 }
>      Source : <0x0005333a> { _delete_vma + 0xb2 } RTS
>   11 Target : <0x00053334> { _delete_vma + 0xac }
>      Source : <0x0005507a> { _kmem_cache_free + 0xba } RTS
>   12 Target : <0x00055068> { _kmem_cache_free + 0xa8 }
>      Source : <0x0005505e> { _kmem_cache_free + 0x9e } IF !CC JUMP pcrel (BP)
>   13 Target : <0x00055052> { _kmem_cache_free + 0x92 }
>      Source : <0x0005501a> { _kmem_cache_free + 0x5a } IF CC JUMP pcrel 
>   14 Target : <0x00054ff4> { _kmem_cache_free + 0x34 }
>      Source : <0x00054fce> { _kmem_cache_free + 0xe } IF CC JUMP pcrel (BP)
>   15 Target : <0x00054fc0> { _kmem_cache_free + 0x0 }
>      Source : <0x00053330> { _delete_vma + 0xa8 } JUMP.L
> Kernel Stack
> Stack info:
>  SP: [0x0569ff24] <0x0569ff24> /* kernel dynamic memory (maybe user-space) */
>  Memory from 0x0569ff20 to 056a0000
> 0569ff20: 00000001 [04e8da5a] 00008000  00000000  00000000  056a0000  04e8da5a  04e8da5a 
> 0569ff40: 04eb9eea  ffa00dce  02003025  04ea09c5  057f523f  04ea09c4  057f523e  00000000 
> 0569ff60: 00000000  00000000  00000000  00000000  00000000  00000000  00000001  00000000 
> 0569ff80: 00000000  00000000  00000000  00000000  00000000  00000000  00000000  00000000 
> 0569ffa0: 0566f5bc  057f8000  057f8000  00000001  04ec0170  056ffcf8  056ffd04  057f9800 
> 0569ffc0: 04d1d498  057f9800  057f8fe4  057f8ef0  00000001  057f928c  00000001  00000001 
> 0569ffe0: 057f9800  00000000  00000008  00000007  00000001  00000001  00000001 <00002806>
> Return addresses in stack:
>     address : <0x00002806> { _show_cpuinfo + 0x2d2 }
> Modules linked in:
> Kernel panic - not syncing: Kernel exception
> ---[ end Kernel panic - not syncing: Kernel exception
> 
> 
> Signed-off-by: Steven Miao <realmz6@xxxxxxxxx>

Acked-by: Davidlohr Bueso <davidlohr@xxxxxx>

Sorry for the late reply. I'm glad we're getting the vmacache tested on
nommu systems -- something I hadn't been able to do.

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