手动触发内核Panic
- sudo su
- 在串口debug port执行：dmesg -w
- echo c > /proc/sysrq-trigger
- 在串口debug port信息：
[...省略] [ 105.863431] sysrq: SysRq : Trigger a crash [ 105.867620] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 105.875935] pgd = 997cb3a6 [ 105.863431] sysrq: SysRq : Trigger a crash [ 105.867620] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 105.87593[ 105.891486] [00000000] *pgd=280b0003, *pmd=fbe97003 [ 105.897059] Internal error: Oops: a07 [#1] SMP ARM [ 105.901927] Modules linked in: fuse xt_conntrack ipt_MASQUERADE nf_conntrack_netlink nft_counter xt_addrtype nft_compat cmac nft_chain_nat_ipv4 nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bnep nf_tables nfnetlink br_netfilter bridge hci_uart btbcm serdev overlay 8021q garp stp llc rfcomm bluetooth ecdh_generic at24 binfmt_misc evdev brcmfmac brcmutil sha256_generic cfg80211 rfkill raspberrypi_hwmon hwmon snd_bcm2835(C) snd_pcm snd_timer gpio_keys snd i2c_bcm2835 bcm2835_codec(C) bcm2835_v4l2(C) v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_dma_contig v4l2_common videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev media vc_sm_cma(C) rpivid_mem uio_pdrv_genirq uio fixed i2c_dev usb_f_ecm g_ether usb_f_rndis u_ether libcomposite dwc2 udc_core nfsd ip_tables x_tables [ 105.974701] ipv6 [ 105.976669] CPU: 3 PID: 1343 Comm: bash Tainted: G C 4.19.71-v7l #1 [ 105.984351] Hardware name: BCM2835 [ 105.987819] PC is at sysrq_handle_crash+0x2c/0x34 [ 105.992596] LR is at __handle_sysrq+0x8c/0x16c [ 105.997106] pc : [<c06a392c>] lr : [<c06a42ec>] psr: 60000013 [ 106.003466] sp : e8f83e40 ip : e8f83e50 fp : e8f83e4c [ 106.008769] r10: 00000004 r9 : 00000000 r8 : c10607fc [ 106.014072] r7 : 00000000 r6 : 00000003 r5 : 00000063 r4 : c1010678 [ 106.020696] r3 : 00000000 r2 : 00000001 r1 : 00000000 r0 : 00000063 [ 106.027322] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 106.034564] Control: 30c5383d Table: 296d0fc0 DAC: 55555555 [ 106.040398] Process bash (pid: 1343, stack limit = 0xecd5d744) [ 106.046318] Stack: (0xe8f83e40 to 0xe8f84000) [ 106.050743] 3e40: e8f83e74 e8f83e50 c06a42ec c06a390c 00000002 c06a4830 00000000 c0423ea8 [ 106.059045] 3e60: b4c01999 00000000 e8f83e8c e8f83e78 c06a4878 c06a426c ef10a200 c06a4830 [ 106.067346] 3e80: e8f83eac e8f83e90 c0423f18 c06a483c c1004d88 e7545f00 e8f83f60 c0423ea8 [ 106.075648] 3ea0: e8f83f24 e8f83eb0 c03b0688 c0423eb4 5e12fb12 098967fc 5e13d9b1 00000000 [ 106.083948] 3ec0: 00000800 00000000 f00000c8 c1004d88 00000a07 c0993bf4 00000000 ef83dd80 [ 106.092249] 3ee0: e8f83f04 e8f83ef0 c0993bf4 c02932f0 00000000 ef83dd80 e8f83f24 b4c01999 [ 106.100551] 3f00: 00000002 e7545f00 01093d88 e8f83f60 00000000 00000000 e8f83f54 e8f83f28 [ 106.108852] 3f20: c03b0998 c03b064c 00000004 c03d1d14 e7545f00 c1004d88 e7545f00 01093d88 [ 106.117153] 3f40: 00000000 00000000 e8f83f94 e8f83f58 c03b0c78 c03b08f0 00000000 00000000 [ 106.125453] 3f60: 00000000 00000000 60000010 b4c01999 00000002 01093d88 b6f14d90 00000004 [ 106.133754] 3f80: c02011c4 e8f82000 e8f83fa4 e8f83f98 c03b0d04 c03b0c10 00000000 e8f83fa8 [ 106.142054] 3fa0: c0201000 c03b0cf8 00000002 01093d88 00000001 01093d88 00000002 00000000 [ 106.150355] 3fc0: 00000002 01093d88 b6f14d90 00000004 01093d88 00000002 001042a8 00000000 [ 106.158655] 3fe0: 0000006c bee0e338 b6e337b8 b6e8f944 60000010 00000001 00000000 00000000 [ 106.166967] [<c06a392c>] (sysrq_handle_crash) from [<c06a42ec>] (__handle_sysrq+0x8c/0x16c) [ 106.175449] [<c06a42ec>] (__handle_sysrq) from [<c06a4878>] (write_sysrq_trigger+0x48/0x58) [ 106.183933] [<c06a4878>] (write_sysrq_trigger) from [<c0423f18>] (proc_reg_write+0x70/0x98) [ 106.192419] [<c0423f18>] (proc_reg_write) from [<c03b0688>] (__vfs_write+0x48/0x170) [ 106.200283] [<c03b0688>] (__vfs_write) from [<c03b0998>] (vfs_write+0xb4/0x1c8) [ 106.207705] [<c03b0998>] (vfs_write) from [<c03b0c78>] (ksys_write+0x74/0xe8) [ 106.214951] [<c03b0c78>] (ksys_write) from [<c03b0d04>] (sys_write+0x18/0x1c) [ 106.222199] [<c03b0d04>] (sys_write) from [<c0201000>] (ret_fast_syscall+0x0/0x28) [ 106.229881] Exception stack(0xe8f83fa8 to 0xe8f83ff0) [ 106.235010] 3fa0: 00000002 01093d88 00000001 01093d88 00000002 00000000 [ 106.243312] 3fc0: 00000002 01093d88 b6f14d90 00000004 01093d88 00000002 001042a8 00000000 [ 106.251610] 3fe0: 0000006c bee0e338 b6e337b8 b6e8f944 [ 106.256742] Code: e3a02001 e5832000 f57ff04e e3a03000 (e5c32000) [ 106.263018] ---[ end trace c08befe48aa7f291 ]--- [ 106.267713] Kernel panic - not syncing: Fatal exception [ 106.267731] CPU2: stopping [ 106.267745] CPU: 2 PID: 434 Comm: rs:main Q:Reg Tainted: G D C 4.19.71-v7l #1 [ 106.267752] Hardware name: BCM2835 [ 106.267783] [<c0212c74>] (unwind_backtrace) from [<c020d2cc>] (show_stack+0x20/0x24) [ 106.267801] [<c020d2cc>] (show_stack) from [<c097ce30>] (dump_stack+0xcc/0x110) [ 106.267819] [<c097ce30>] (dump_stack) from [<c02110c8>] (handle_IPI+0x368/0x3a0) [ 106.267834] [<c02110c8>] (handle_IPI) from [<c020226c>] (gic_handle_irq+0x84/0x88) [ 106.267846] [<c020226c>] (gic_handle_irq) from [<c02019bc>] (__irq_svc+0x5c/0x7c) [ 106.267854] Exception stack(0xe9c47c78 to 0xe9c47cc0) [ 106.267862] 7c60: 7fffffff 00000000 [ 106.267873] 7c80: b4c01999 b4c01999 c1010658 7fffffff ffffe000 00000002 c1004d88 f492926c [ 106.267882] 7ca0: c1004d88 e9c47d04 e9c46000 e9c47cc8 00000000 c0995da4 60000013 ffffffff [ 106.267898] [<c02019bc>] (__irq_svc) from [<c0995da4>] (__down+0xa0/0xf4) [ 106.267913] [<c0995da4>] (__down) from [<c0278620>] (down+0x54/0x5c) [ 106.267928] [<c0278620>] (down) from [<c027d590>] (console_lock+0x20/0x44) [ 106.267945] [<c027d590>] (console_lock) from [<c06b310c>] (do_con_write.part.13+0x40/0x900) [ 106.267963] [<c06b310c>] (do_con_write.part.13) from [<c06b3a80>] (con_write+0x48/0x94) [ 106.267978] [<c06b3a80>] (con_write) from [<c069b5a8>] (n_tty_write+0x390/0x4b8) [ 106.267991] [<c069b5a8>] (n_tty_write) from [<c0697284>] (tty_write+0x164/0x354) [ 106.268003] [<c0697284>] (tty_write) from [<c03b0688>] (__vfs_write+0x48/0x170) [ 106.268016] [<c03b0688>] (__vfs_write) from [<c03b0998>] (vfs_write+0xb4/0x1c8) [ 106.268027] [<c03b0998>] (vfs_write) from [<c03b0c78>] (ksys_write+0x74/0xe8) [ 106.268038] [<c03b0c78>] (ksys_write) from [<c03b0d04>] (sys_write+0x18/0x1c) [ 106.268051] [<c03b0d04>] (sys_write) from [<c0201000>] (ret_fast_syscall+0x0/0x28) [ 106.268058] Exception stack(0xe9c47fa8 to 0xe9c47ff0) [ 106.268067] 7fa0: 00000087 b60400d8 0000000f b60400d8 00000087 00000000 [ 106.268077] 7fc0: 00000087 b60400d8 0000000f 00000004 000ac848 00000901 b60400d8 000ac98c [ 106.268085] 7fe0: 00000002 b5efe238 00000000 b6eaa1bc [ 106.268093] CPU0: stopping [ 106.268118] CPU: 0 PID: 105 Comm: systemd-journal Tainted: G D C 4.19.71-v7l #1 [ 106.268124] Hardware name: BCM2835 [ 106.268149] [<c0212c74>] (unwind_backtrace) from [<c020d2cc>] (show_stack+0x20/0x24) [ 106.268166] [<c020d2cc>] (show_stack) from [<c097ce30>] (dump_stack+0xcc/0x110) [ 106.268182] [<c097ce30>] (dump_stack) from [<c02110c8>] (handle_IPI+0x368/0x3a0) [ 106.268197] [<c02110c8>] (handle_IPI) from [<c020226c>] (gic_handle_irq+0x84/0x88) [ 106.268210] [<c020226c>] (gic_handle_irq) from [<c0201d0c>] (__irq_usr+0x4c/0x60) [ 106.268217] Exception stack(0xec5f9fb0 to 0xec5f9ff8) [ 106.268227] 9fa0: 00dce89c 00d7b5fc ffffff85 554f535f [ 106.268237] 9fc0: 5f454352 4f4e4f4d 494e4f54 49545f43 5453454d 00d7b5d8 befdf314 00d7b5d8 [ 106.268246] 9fe0: 0000001c befdf204 34373035 b6e39858 00000010 ffffffff [ 106.268254] CPU1: stopping [ 106.268267] CPU: 1 PID: 1310 Comm: dmesg Tainted: G D C 4.19.71-v7l #1 [ 106.268273] Hardware name: BCM2835 [ 106.268294] [<c0212c74>] (unwind_backtrace) from [<c020d2cc>] (show_stack+0x20/0x24) [ 106.268312] [<c020d2cc>] (show_stack) from [<c097ce30>] (dump_stack+0xcc/0x110) [ 106.268328] [<c097ce30>] (dump_stack) from [<c02110c8>] (handle_IPI+0x368/0x3a0) [ 106.268342] [<c02110c8>] (handle_IPI) from [<c020226c>] (gic_handle_irq+0x84/0x88) [ 106.268354] [<c020226c>] (gic_handle_irq) from [<c0201d0c>] (__irq_usr+0x4c/0x60) [ 106.268361] Exception stack(0xe75a5fb0 to 0xe75a5ff8) [ 106.268371] 5fa0: 00000332 014afee8 00000332 00000000 [ 106.268381] 5fc0: 00000332 014afee8 b6f1ad90 00000004 014afee8 00000332 be8a2ba8 0002d06e [ 106.268390] 5fe0: 0000006c be8a29a8 b6e397b8 b6e95944 60000010 ffffffff [ 106.633384] ---[ end Kernel panic - not syncing: Fatal exception ]---
- 为树莓派编译Kdump kernel
- Configuring the kernel
- sudo apt-get install kdump-tools
- 安装失败，会提示内核不支持
- arch/arm/configs/bcm2711_defconfig
- make CROSS_COMPILE=arm-linux-gnueabihf- menuconfig
- CONFIG_DEBUG_INFO
- CONFIG_CRASH_DUMP
- CONFIG_PROC_VMCORE
- KEXEC
- 默认不支持kdump