dmesg 程序崩溃调试2
- dmesg命令基于缓冲区打印信息
dmesg -c可以清除该内存信息
清除后demsg 命令不显示任何信息,但可以到/var/log/dmesg查看信息- dmesg |tail 20
dmesg |head 20
dmesg |grep sda
dmesg |grep tty
dmesg |grep memory
dmesg |grep DMA
dmesg |grep usb- [root@localhost var]# dmesg | more
- Linux version .. (root@localhost.localdomain) (gcc version .. (Red Hat ..-))
- # SMP Sun Sep :: PDT
- Command line: ro root=LABEL=/ rhgb quiet
- KERNEL supported cpus:
- Intel GenuineIntel
- AMD AuthenticAMD
- Centaur CentaurHauls
- BIOS-provided physical RAM map:
- BIOS-e820: - 000000000009f400 (usable)
- BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
- BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved)
- BIOS-e820: 00000000000dc000 - (reserved)
- BIOS-e820: - 0000000057ee0000 (usable)
- BIOS-e820: 0000000057ee0000 - 0000000057eff000 (ACPI data)
- BIOS-e820: 0000000057eff000 - 0000000057f00000 (ACPI NVS)
- BIOS-e820: 0000000057f00000 - (usable)
- BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
- BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
- BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
- BIOS-e820: 00000000fffe0000 - (reserved)
- DMI present.
- Phoenix BIOS detected: BIOS may corrupt low RAM, working around it.
- e820 update range: - (usable) ==> (reserved)
- last_pfn = 0x58000 max_arch_pfn = 0x400000000
- MTRR default type: uncachable
- MTRR fixed ranges enabled:
- -9FFFF write-back
- A0000-BFFFF uncachable
- C0000-CBFFF write-protect
- CC000-EFFFF uncachable
- F0000-FFFFF write-protect
- [root@localhost var]# dmesg | less
- Linux version .. (root@localhost.localdomain) (gcc version .. (Red Hat ..-))
- # SMP Sun Sep :: PDT
- Command line: ro root=LABEL=/ rhgb quiet
- KERNEL supported cpus:
- Intel GenuineIntel
- AMD AuthenticAMD
- Centaur CentaurHauls
- BIOS-provided physical RAM map:
- BIOS-e820: - 000000000009f400 (usable)
- BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
- BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved)
- BIOS-e820: 00000000000dc000 - (reserved)
- BIOS-e820: - 0000000057ee0000 (usable)
- BIOS-e820: 0000000057ee0000 - 0000000057eff000 (ACPI data)
- BIOS-e820: 0000000057eff000 - 0000000057f00000 (ACPI NVS)
- BIOS-e820: 0000000057f00000 - (usable)
- BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
- BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
- BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
- BIOS-e820: 00000000fffe0000 - (reserved)
- DMI present.
- Phoenix BIOS detected: BIOS may corrupt low RAM, working around it.
- e820 update range: - (usable) ==> (reserved)
- last_pfn = 0x58000 max_arch_pfn = 0x400000000
- MTRR default type: uncachable
- MTRR fixed ranges enabled:
- -9FFFF write-back
- A0000-BFFFF uncachable
- C0000-CBFFF write-protect
- CC000-EFFFF uncachable
- F0000-FFFFF write-protect
- [root@localhost var]# dmesg | tail
- Bluetooth: L2CAP socket layer initialized
- Bluetooth: RFCOMM TTY layer initialized
- Bluetooth: RFCOMM socket layer initialized
- Bluetooth: RFCOMM ver .
- Bluetooth: HIDP (Human Interface Emulation) ver .
- eth0: no IPv6 routers present
- hdc: task_pio_intr: status=0x51 { DriveReady SeekComplete Error }
- hdc: task_pio_intr: error=0x04 { AbortedCommand }
- hdc: possibly failed opcode: 0xec
- xx[]: segfault at ip sp 00007fff206b7d60 error in xx[+]
- [root@localhost var]# dmesg | grep ttyS*
- console [tty0] enabled
- serial8250: ttyS0 at I/O 0x3f8 (irq = ) is a 16550A
- serial8250: ttyS1 at I/O 0x2f8 (irq = ) is a 16550A
- :0a: ttyS0 at I/O 0x3f8 (irq = ) is a 16550A
- :0b: ttyS1 at I/O 0x2f8 (irq = ) is a 16550A
- You have new mail in /var/spool/mail/root
- dmesg -c 清除缓存
- tail -n 20 /var/log/dmesg
- [root@localhost log]# tail -n /var/log/dmesg
- Floppy drive(s): fd0 is .44M
- FDC is a post-
- ide-cd driver .
- ide-cd: hdc: ATAPI 1X DVD-ROM DVD-R/RAM CD-R/RW drive, 32kB Cache
- Uniform CD-ROM driver Revision: .
- sd :::: Attached scsi generic sg0 type
- lp0: using parport0 (interrupt-driven).
- lp0: console ready
- NET: Registered protocol family
- lo: Disabled Privacy Extensions
- md: Autodetecting RAID arrays.
- md: Scanned and added devices.
- md: autorun ...
- md: ... autorun DONE.
- device-mapper: multipath: version .. loaded
- EXT3 FS on sda2, internal journal
- kjournald starting. Commit interval seconds
- EXT3 FS on sda1, internal journal
- EXT3-fs: mounted filesystem with writeback data mode.
- Adding 2064344k swap on /dev/sda3. Priority:- extents: across:2064344k
- [root@localhost log]# tail -n messages
- May :: localhost avahi-daemon[]: Server startup complete. Host name is localhost.local. Local service cookie is .
- May :: localhost avahi-daemon[]: Service "SFTP File Transfer on localhost" (/services/sftp-ssh.service) successfully established.
- May :: localhost smartd[]: smartd version . [x86_64-redhat-linux-gnu] Copyright (C) - Bruce Allen
- May :: localhost smartd[]: Home page is http://smartmontools.sourceforge.net/
- May :: localhost smartd[]: Opened configuration file /etc/smartd.conf
- May :: localhost smartd[]: Configuration file /etc/smartd.conf was parsed, found DEVICESCAN, scanning devices
- May :: localhost smartd[]: Device: /dev/hdc, opened
- May :: localhost smartd[]: Device: /dev/hdc, not ATA, no IDENTIFY DEVICE Structure
- May :: localhost kernel: hdc: task_pio_intr: status=0x51 { DriveReady SeekComplete Error }
- May :: localhost kernel: hdc: task_pio_intr: error=0x04 { AbortedCommand }
- May :: localhost kernel: hdc: possibly failed opcode: 0xec
- May :: localhost smartd[]: Device: /dev/sda, opened
- May :: localhost smartd[]: Device: /dev/sda, IE (SMART) not enabled, skip device Try 'smartctl -s on /dev/sda' to turn on SMART features
- May :: localhost smartd[]: Monitoring ATA and SCSI devices
- May :: localhost smartd[]: smartd has fork()ed into background mode. New PID=.
- May :: localhost gdm[]: gdm_config_parse: Logdir /var/log/gdm does not exist or isn't a directory. Using ServAuthDir /var/gdm.
- May 28 22:42:25 localhost pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0 Not Found
- May 28 22:42:25 localhost last message repeated 3 times
- May 28 22:43:45 localhost kernel: xx[4107]: segfault at 0 ip 0000000000400454 sp 00007fff206b7d60 error 6 in xx[400000+1000]
- May 28 22:45:06 localhost logger: Oracle Configuration Manager failed to establish a connection to Oracle. Reconfigure using /opt/oracle/112/ccr/bin/configCCR
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