[FS#3277] malta/mipseb64:

[OpenWrt Bugs]

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FS#3277 - malta/mipseb64:
User who did this - Tony Ambardar (guidosarducci)

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Still seeing the same error after updating to current openwrt commit b59a98b009b9. Enabling debug of procd init shows a little more information.


 ./scripts/qemustart malta be64 -append "init_debug=4"

[...]

[    1.264652] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[    1.276184] scsi 1:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ PQ: 0 ANSI: 5
[    1.311226] Freeing unused kernel memory: 21628K
[    1.311469] This architecture does not have kernel memory protection.
[    1.311787] Run /init as init process
[    1.418543] init: Console is alive
[    1.436103] init: Ping
[    1.447138] init: Ping
[    1.457733] init: Ping
[    1.468352] init: Ping
[    1.478950] init: Ping
[    1.489642] init: Ping
[    1.500256] init: Ping
[    1.506097] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    1.511427] init: Ping
[    1.516345] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    1.522048] init: Ping
[    1.525605] init: - preinit -
[    1.529807] init: Launched preinit instance, pid=505
[    1.535329] do_page_fault(): sending SIGSEGV to init for invalid read access from 0000000000000360
[    1.535755] epc = 0000000000000360 in init[aaab9d8000+4000]
[    1.536552] ra  = 000000fffc2f05f0 in
[    1.538997] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    1.540118] Rebooting in 1 seconds..


Looking at the [[https://lxr.openwrt.org/source/procd/initd/init.c|procd code]], the main init seems to start OK, then forks kmodloader which also completes without error. The subsequent code does:
uloop_init();
preinit();
uloop_run();

Looking at the [[https://lxr.openwrt.org/source/procd/initd/preinit.c#L125|preinit() code]], it appears to fork plugd:
/sbin/procd -h /etc/hotplug-preinit.json
and then fork a preinit instance:
/bin/sh /etc/preinit
before printing a DEBUG message and returning. The above seems to have worked.

The kernel panic is immediately after, and the logged "exitcode=0x0000000b" is:
EAGAIN 11 Resource temporarily unavailable

Perhaps there's an issue with one of the forked process, or during uloop_run().
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3277#comment8650

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