Flatcar 2023-12-11-2151 ISO image - Panicking on QEMU

[retpolanne]

Description

The image flatcar_production_iso_image.iso is panicking on QEMU.

flatcar_production_iso_image.iso

Impact

Can't start the iso on QEMU, making it unusable with Packer, for example.

Environment and steps to reproduce

1. Set-up: QEMU 8.1.3
2. Task: /usr/local/bin/qemu-system-x86_64 -name flatcar -m 512M -device "virtio-net,netdev=user.0" -smp 1 -machine "type=pc,accel=hvf,highmem=off" -netdev "user,id=user.0,hostfwd=tcp::3540-:22" -cpu host -serial stdio -display none -kernel /Volumes/CDROM/flatcar/vmlinuz -initrd /Volumes/CDROM/flatcar/cpio.gz -append "flatcar.autologin console=ttyS0"
3. Action(s):
4. Error:

[    0.538528] Mem-Info:
[    0.539261] active_anon:417 inactive_anon:13785 isolated_anon:0
[    0.539261]  active_file:0 inactive_file:0 isolated_file:0
[    0.539261]  unevictable:0 dirty:0 writeback:0
[    0.539261]  slab_reclaimable:1812 slab_unreclaimable:1342
[    0.539261]  mapped:0 shmem:14211 pagetables:3 bounce:0
[    0.539261]  kernel_misc_reclaimable:0
[    0.539261]  free:9136 free_pcp:349 free_cma:0
[    0.550388] Node 0 active_anon:1668kB inactive_anon:55140kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:56844kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:576kB pagetables:12kB all_unreclaimable? no
[    0.559336] Node 0 DMA free:15360kB min:180kB low:224kB high:268kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[    0.567336] lowmem_reserve[]: 0 96 96 96
[    0.568668] Node 0 DMA32 free:21184kB min:1164kB low:1452kB high:1740kB reserved_highatomic:0KB active_anon:1668kB inactive_anon:55140kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:507776kB managed:98336kB mlocked:0kB bounce:0kB free_pcp:1396kB local_pcp:1396kB free_cma:0kB
[    0.577292] lowmem_reserve[]: 0 0 0 0
[    0.578524] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15360kB
[    0.582380] Node 0 DMA32: 1*4kB (U) 2*8kB (U) 9*16kB (UME) 5*32kB (UE) 0*64kB 1*128kB (E) 1*256kB (E) 4*512kB (UME) 0*1024kB 1*2048kB (U) 4*4096kB (UM) = 21188kB
[    0.586768] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[    0.589393] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[    0.591916] 14211 total pagecache pages
[    0.593087] 0 pages in swap cache
[    0.594138] Swap cache stats: add 0, delete 0, find 0/0
[    0.595708] Free swap  = 0kB
[    0.596635] Total swap = 0kB
[    0.597582] 130942 pages RAM
[    0.598422] 0 pages HighMem/MovableOnly
[    0.599687] 102518 pages reserved
[    0.600751] 0 pages hwpoisoned
[    0.601702] Kernel panic - not syncing: 
[    0.602964] CPU: 0 PID: 43 Comm: kworker/u2:1 Not tainted 5.15.142-flatcar #1
[    0.605115] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
[    0.608533] Workqueue: events_unbound async_run_entry_fn
[    0.610134] Call Trace:
[    0.610887]  <TASK>
[    0.611538]  dump_stack_lvl+0x45/0x5b
[    0.612665]  panic+0x105/0x2e9
[    0.613585]  panic_show_mem+0x68/0x68
[    0.614699]  do_populate_rootfs+0x2d/0x100
[    0.615932]  async_run_entry_fn+0x2e/0x110
[    0.617227]  process_one_work+0x21e/0x3b0
[    0.618468]  worker_thread+0x4a/0x3e0
[    0.619541]  ? process_one_work+0x3b0/0x3b0
[    0.620842]  kthread+0x118/0x140
[    0.621822]  ? set_kthread_struct+0x50/0x50
[    0.623084]  ret_from_fork+0x22/0x30
[    0.624162]  </TASK>
[    0.625028] Kernel Offset: 0x25000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[    0.628163] Rebooting in 60 seconds..

Expected behavior

Flatcar should boot.

Additional information

I tried using the vmlinuz and cpio.gz from the iso so I could get the kernel panic trace, but it also fails with the iso image as a CDROM.

[retpolanne]

Oops, just found the problem. 512M doesn't seem enough for this image. Increased it to 1024M and it booted :)