mt7622: belkin-rt3200: r22602-42eeb22450: Kernel panic: kernel stack overflow

[Petr Štetiar]

Hi,

I've just noticed, that daily CI runtime testing job on belkin-rt3200
failed[1] due to following:

 Insufficient stack space to handle exception!
 ESR: 0x0000000096000047 -- DABT (current EL)
 FAR: 0xffffffc008c47fe0
 Task stack:     [0xffffffc008c48000..0xffffffc008c4c000]
 IRQ stack:      [0xffffffc008008000..0xffffffc00800c000]
 Overflow stack: [0xffffff801feb00a0..0xffffff801feb10a0]
 CPU: 1 PID: 1 Comm: swapper/0 Tainted: G S                5.15.107 #0
 Hardware name: Linksys E8450 (DT)
 pstate: 800000c5 (Nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : dequeue_entity+0x0/0x250
 lr : dequeue_task_fair+0x98/0x290
 sp : ffffffc008c48030
 x29: ffffffc008c48030 x28: 0000000000000001 x27: ffffff801feb6380
 x26: 0000000000000001 x25: ffffff801feb6300 x24: ffffff8000068000
 x23: 0000000000000001 x22: 0000000000000009 x21: 0000000000000000
 x20: ffffff801feb6380 x19: ffffff8000068080 x18: 0000000017a740a6
 x17: ffffffc008bae748 x16: ffffffc008bae6d8 x15: ffffffffffffffff
 x14: ffffffffffffffff x13: 0000000000000000 x12: 0000000f00000101
 x11: 0000000000000449 x10: 0000000000000127 x9 : 0000000000000000
 x8 : 0000000000000125 x7 : 0000000000116da1 x6 : 0000000000116da1
 x5 : 00000000001165a1 x4 : ffffff801feb6e00 x3 : 0000000000000000
 x2 : 0000000000000009 x1 : ffffff8000068080 x0 : ffffff801feb6380
 Kernel panic - not syncing: kernel stack overflow
 SMP: stopping secondary CPUs
 SMP: failed to stop secondary CPUs 0-1
 Kernel Offset: disabled
 CPU features: 0x00003000,00000802
 Memory Limit: none

Last working version was r22580-e11d00d44c[2], and first failing version was
yesterday 1416b9bbe9, so possibly the regression was introduced in one of the
following commits:

 1416b9bbe9d3 tools/dwarves: update to 1.25
 9931188edcbc kernel: fix up qrtr packaging after 5.15.107 bump
 f4989239cc91 kernel: bump 5.15 to 5.15.107
 89f6ac5fd1ad tools/cmake: update to 3.26.3
 ab3f151aa874 mwlwifi: update to version 10.3.9.0-20230311
 5ec781c4448b bmips: pci-bcm6348: load IO resource from DT ranges
 16b0cbbde057 bmips: drop unneeded ath9k fixup
 db4f158c0330 bmips: hg556a: switch to kmod-owl-loader
 36150ff6ffb2 tools/bzip2: add `bzip2` binaries
 b691362d1dbe Revert "tools/bzip2: add `bzip2` binaries"
 f7f47b136991 mac80211: ath11k: replace 160MHz fix with upstream pending one
 4ab4b9ea818d build: fix incorrect initramfs gzip compression
 69bc620180d2 build: fix incorrect initramfs bzip2 compression
 394d7134ec42 tools/bzip2: add `bzip2` binaries
 5264296ce480 ath79: mikrotik: update kernel on NAND using Yafut
 27acf2413e91 yafut: add a kernel update tool for MikroTik NAND
 fa4dc86e9808 kernel: backport MEMREAD ioctl
 e722b667c5a5 mac80211: update to v6.1.24

1. https://ynezz.gitlab.io/-/openwrt-device-runtime-testing/-/jobs/4153023579/artifacts/console_belkin-rt3200-initramfs.txt
2. https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/4137718871

Cheers,

Petr