OK, so i worked out mips kexec needs an .elf file. So, i got the kernel .elf from the targets build. It is the same kernel that is running in the board, so in theory, kexecing it should just restart the kernel.
So, i scp vmlinux.elf to /tmp run: # kexec /tmp/vmlinux.elf and it crashes, same as if i run kexec -l. It is complaining that the kernel is attempting to over-write its own memory. Which would make sense, except i would expect kexec to handle that properly. What am i doing wrong? Output from the command: Modified cmdline: Unable to find /proc/device-tree/chosen/[linux,]stdout-path, printing from purgatory is disabled [ 135.527029] kexec command line truncated to 256 bytes [ 135.532110] usercopy: Kernel memory overwrite attempt detected to kernel text (offset 81828, size 256)! [ 135.541512] Kernel bug detected[#1]: [ 135.545080] CPU: 2 PID: 2020 Comm: kexec Not tainted 5.4.124 #0 [ 135.550971] $ 0 : 00000000 00000001 0000005b 00000000 [ 135.556181] $ 4 : 8101c34c 8101c34c 81021070 000001b0 [ 135.561389] $ 8 : 00000000 74657366 38313820 202c3832 [ 135.566596] $12 : 656e696c ffffff7f 00000001 75727420 [ 135.571806] $16 : 800153a4 00000100 00000000 800154a4 [ 135.577014] $20 : 0041e02c 80010000 00000000 00000000 [ 135.582222] $24 : 00000002 802a8db0 [ 135.587431] $28 : 8f340000 8f341e50 80550000 8012ecc4 [ 135.592640] Hi : 00000122 [ 135.595505] Lo : d1768000 [ 135.598399] epc : 8012ecc4 usercopy_abort+0x94/0x98 [ 135.603430] ra : 8012ecc4 usercopy_abort+0x94/0x98 [ 135.608455] Status: 11007c03 KERNEL EXL IE [ 135.612625] Cause : 50800024 (ExcCode 09) [ 135.616615] PrId : 0001992f (MIPS 1004Kc) [ 135.620688] Modules linked in: mt7915e mt76 mac80211 cfg80211 hwmon crc_ccitt compat leds_gpio gpio_button_hotplug zram zsmalloc [ 135.632238] Process kexec (pid: 2020, threadinfo=ed102de2, task=6523d5dc, tls=77ed1ec8) [ 135.640201] Stack : 8e092c00 804db438 80523508 804db560 804d4284 804d4284 804d4284 00013fa4 [ 135.648529] 00000100 8e092c00 00000000 8012ee1c 804c65bc 8f341eb4 0041e02c 80064a84 [ 135.656856] 00000100 8e092c00 38e38e39 00000100 80015378 8e092c00 80010000 80014c9c [ 135.665184] 8f341eb0 00000100 00000006 804c65ba 8e092c00 806c8fe8 00000000 8e092c20 [ 135.673511] 00000000 00000003 00000000 80097ae4 00000000 80109640 60d1c076 00000000 [ 135.681837] ... [ 135.684275] Call Trace: [ 135.686714] [<8012ecc4>] usercopy_abort+0x94/0x98 [ 135.691406] [<8012ee1c>] __check_object_size+0x154/0x1c4 [ 135.696714] [<80014c9c>] machine_kexec_prepare+0x124/0x2c4 [ 135.702189] [<80097ae4>] sys_kexec_load+0x268/0x39c [ 135.707049] [<800135d8>] syscall_common+0x34/0x58 [ 135.711738] Code: afa30010 0c019299 2484b4dc <000c000d> 3c028053 8c422da0 1c40006c 00000000 27bdffd0 [ 135.721456] [ 135.723231] ---[ end trace cb64d01840ff96a3 ]--- [ 135.727845] Kernel panic - not syncing: Fatal exception [ 135.733082] Rebooting in 3 seconds.. _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
