Hey so this is totally still happening on kernel 5.8.0-53. Just got this serial console capture:


babylon login: [1457468.880947] BUG: stack guard page was hit at 000000007aef1a4a (stack is 00000000af9c61cd..000000007ccda653)
[1457468.880948] kernel stack overflow (double-fault): 0000 [#1] SMP NOPTI
[1457468.880948] CPU: 3 PID: 512 Comm: md0_raid6 Tainted: P           OE     5.8.0-53-generic #60-Ubuntu
[1457468.880949] Hardware name: Gigabyte Technology Co., Ltd. B550M AORUS PRO/B550M AORUS PRO, BIOS F13h 04/23/2021
[1457468.880949] RIP: 0010:slab_free_freelist_hook+0x35/0x120
[1457468.880950] Code: 89 d5 41 54 49 89 f4 53 48 89 fb 48 83 ec 08 48 8b 02 4c 8b 36 48 c7 06 00 00 00 00 48 c7 02 00 00 00 00 48 85 c0 49 0f 44 c6 <48> 89 45 d0 eb 06 4c 3b 7d d0 74 5d 8b 53 20 4d 89 f7 49 8d 34 16
[1457468.880951] RSP: 0018:ffffbcda805efff8 EFLAGS: 00010246
[1457468.880952] RAX: ffff9bfb8ccc42a0 RBX: ffff9bfcdb407800 RCX: 0000000000000001
[1457468.880952] RDX: ffffbcda805f0040 RSI: ffffbcda805f0038 RDI: ffff9bfcdb407800
[1457468.880953] RBP: ffffbcda805f0028 R08: 0000000000000001 R09: ffffffff90841600
[1457468.880953] R10: ffff9bfb8ccc4f40 R11: 0000000000000001 R12: ffffbcda805f0038
[1457468.880953] R13: ffffbcda805f0040 R14: ffff9bfb8ccc42a0 R15: ffff9bf766967940
[1457468.880954] FS:  0000000000000000(0000) GS:ffff9bfcdeac0000(0000) knlGS:0000000000000000
[1457468.880954] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1457468.880955] CR2: ffffbcda805effe8 CR3: 00000003a65ee000 CR4: 0000000000340ee0
[1457468.880955] Call Trace:
[1457468.880955]  ? mempool_kfree+0xe/0x10
[1457468.880956]  ? kfree+0xb8/0x220
[1457468.880956]  ? mempool_kfree+0xe/0x10
[1457468.880956]  ? mempool_free+0x2f/0x80
[1457468.880956]  ? md_end_io+0x4b/0x70
[1457468.880957]  ? bio_endio+0xe6/0x150
[1457468.880957]  ? bio_chain_endio+0x2d/0x40
[1457468.880957]  ? md_end_io+0x5d/0x70
[1457468.880958]  ? bio_endio+0xe6/0x150
[1457468.880958]  ? bio_chain_endio+0x2d/0x40
[1457468.880958]  ? md_end_io+0x5d/0x70
[1457468.880959]  ? bio_endio+0xe6/0x150
[1457468.880959]  ? bio_chain_endio+0x2d/0x40
[1457468.880959]  ? md_end_io+0x5d/0x70
[1457468.880959]  ? bio_endio+0xe6/0x150
[1457468.880960]  ? bio_chain_endio+0x2d/0x40
[1457468.880960]  ? md_end_io+0x5d/0x70
[1457468.880960]  ? bio_endio+0xe6/0x150
[1457468.880960]  ? bio_chain_endio+0x2d/0x40
[1457468.880961]  ? md_end_io+0x5d/0x70
[1457468.880961]  ? bio_endio+0xe6/0x150
[1457468.880961]  ? bio_chain_endio+0x2d/0x40
[1457468.880962]  ? md_end_io+0x5d/0x70
[1457468.880962]  ? bio_endio+0xe6/0x150
[1457468.880962]  ? bio_chain_endio+0x2d/0x40
[1457468.880962]  ? md_end_io+0x5d/0x70
[1457468.880963]  ? bio_endio+0xe6/0x150
[1457468.880963]  ? bio_chain_endio+0x2d/0x40
[1457468.880963]  ? md_end_io+0x5d/0x70
[1457468.880963]  ? bio_endio+0xe6/0x150
[1457468.880964]  ? bio_chain_endio+0x2d/0x40
[1457468.880964]  ? md_end_io+0x5d/0x70
[1457468.880964]  ? bio_endio+0xe6/0x150
[1457468.880965]  ? bio_chain_endio+0x2d/0x40
[1457468.880965]  ? md_end_io+0x5d/0x70
[1457468.880965]  ? bio_endio+0xe6/0x150
[1457468.880965]  ? bio_chain_endio+0x2d/0x40
[1457468.880966]  ? md_end_io+0x5d/0x70
[1457468.880966]  ? bio_endio+0xe6/0x150
[1457468.880966]  ? bio_chain_endio+0x2d/0x40
[1457468.880966]  ? md_end_io+0x5d/0x70
[1457468.880967]  ? bio_endio+0xe6/0x150
[1457468.880967]  ? bio_chain_endio+0x2d/0x40
[1457468.880967]  ? md_end_io+0x5d/0x70
[1457468.880968]  ? bio_endio+0xe6/0x150
[1457468.880968]  ? bio_chain_endio+0x2d/0x40
[1457468.880968]  ? md_end_io+0x5d/0x70
[1457468.880968]  ? bio_endio+0xe6/0x150
[1457468.880969]  ? bio_chain_endio+0x2d/0x40
[1457468.880969]  ? md_end_io+0x5d/0x70
[1457468.880969]  ? bio_endio+0xe6/0x150
[1457468.880969]  ? bio_chain_endio+0x2d/0x40
[1457468.880970]  ? md_end_io+0x5d/0x70
[1457468.880970]  ? bio_endio+0xe6/0x150
[1457468.880970]  ? bio_chain_endio+0x2d/0x40
[1457468.880971]  ? md_end_io+0x5d/0x70
[1457468.880971]  ? bio_endio+0xe6/0x150
[1457468.880971]  ? bio_chain_endio+0x2d/0x40
[1457468.880971]  ? md_end_io+0x5d/0x70
[1457468.880972]  ? bio_endio+0xe6/0x150
[1457468.880972]  ? bio_chain_endio+0x2d/0x40
[1457468.880972]  ? md_end_io+0x5d/0x70
[1457468.880972]  ? bio_endio+0xe6/0x150
[1457468.880973]  ? bio_chain_endio+0x2d/0x40
[1457468.880973]  ? md_end_io+0x5d/0x70
[1457468.880973]  ? bio_endio+0xe6/0x150
[1457468.880973]  ? bio_chain_endio+0x2d/0x40
[1457468.880974]  ? md_end_io+0x5d/0x70
[1457468.880974]  ? bio_endio+0xe6/0x150
[1457468.880974]  ? bio_chain_endio+0x2d/0x40
[1457468.880975]  ? md_end_io+0x5d/0x70
[1457468.880975]  ? bio_endio+0xe6/0x150
[1457468.880975]  ? bio_chain_endio+0x2d/0x40
[1457468.880975]  ? md_end_io+0x5d/0x70
[1457468.880976]  ? bio_endio+0xe6/0x150
[1457468.880976]  ? bio_chain_endio+0x2d/0x40
[1457468.880976]  ? md_end_io+0x5d/0x70
[1457468.880976]  ? bio_endio+0xe6/0x150
[1457468.880977]  ? bio_chain_endio+0x2d/0x40
[1457468.880977]  ? md_end_io+0x5d/0x70
[1457468.880977]  ? bio_endio+0xe6/0x150
[1457468.880978]  ? bio_chain_endio+0x2d/0x40
[1457468.880978]  ? md_end_io+0x5d/0x70
[1457468.880978]  ? bio_endio+0xe6/0x150
[1457468.880978]  ? bio_chain_endio+0x2d/0x40
[1457468.880979]  ? md_end_io+0x5d/0x70
[1457468.880979]  ? bio_endio+0xe6/0x150
[1457468.880979]  ? bio_chain_endio+0x2d/0x40
[1457468.880979]  ? md_end_io+0x5d/0x70
[1457468.880980]  ? bio_endio+0xe6/0x150
[1457468.880980]  ? bio_chain_endio+0x2d/0x40
[1457468.880980]  ? md_end_io+0x5d/0x70
[1457468.880981]  ? bio_endio+0xe6/0x150
[1457468.880981]  ? bio_chain_endio+0x2d/0x40
[1457468.880981]  ? md_end_io+0x5d/0x70
[1457468.880981]  ? bio_endio+0xe6/0x150
[1457468.880982]  ? bio_chain_endio+0x2d/0x40
[1457468.880982]  ? md_end_io+0x5d/0x70
[1457468.880982]  ? bio_endio+0xe6/0x150
[1457468.880982]  ? bio_chain_endio+0x2d/0x40
[1457468.880983]  ? md_end_io+0x5d/0x70
[1457468.880983]  ? bio_endio+0xe6/0x150
[1457468.880983]  ? bio_chain_endio+0x2d/0x40
[1457468.880984]  ? md_end_io+0x5d/0x70
[1457468.880984]  ? bio_endio+0xe6/0x150
[1457468.880984]  ? bio_chain_endio+0x2d/0x40
[1457468.880984]  ? md_end_io+0x5d/0x70
[1457468.880985]  ? bio_endio+0xe6/0x150
[1457468.880985]  ? bio_chain_endio+0x2d/0x40
[1457468.880985]  ? md_end_io+0x5d/0x70
[1457468.880985]  ? bio_endio+0xe6/0x150
[1457468.880986]  ? bio_chain_endio+0x2d/0x40
[1457468.880986]  ? md_end_io+0x5d/0x70
[1457468.880986]  ? bio_endio+0xe6/0x150
[1457468.880987]  ? bio_chain_endio+0x2d/0x40
[1457468.880987]  ? md_end_io+0x5d/0x70
[1457468.880987]  ? bio_endio+0xe6/0x150
[1457468.880987]  ? bio_chain_endio+0x2d/0x40
[1457468.880988]  ? md_end_io+0x5d/0x70
[1457468.880988]  ? bio_endio+0xe6/0x150
[1457468.880988]  ? bio_chain_endio+0x2d/0x40
[1457468.880988]  ? md_end_io+0x5d/0x70
[1457468.880989]  ? bio_endio+0xe6/0x150
[1457468.880989]  ? bio_chain_endio+0x2d/0x40
[1457468.880989]  ? md_end_io+0x5d/0x70
[1457468.880989]  ? bio_endio+0xe6/0x150
[1457468.880990]  ? bio_chain_endio+0x2d/0x40
[1457468.880990]  ? md_end_io+0x5d/0x70
[1457468.880990]  ? bio_endio+0xe6/0x150
[1457468.880991]  ? bio_chain_endio+0x2d/0x40
[1457468.880991]  ? md_end_io+0x5d/0x70
[1457468.880991]  ? bio_endio+0xe6/0x150
[1457468.880991]  ? bio_chain_endio+0x2d/0x40
[1457468.880992]  ? md_end_io+0x5d/0x70
[1457468.880992]  ? bio_endio+0xe6/0x150
[1457468.880992]  ? bio_chain_endio+0x2d/0x40
[1457468.880992]  ? md_end_io+0x5d/0x70
[1457468.880993]  ? bio_endio+0xe6/0x150
[1457468.880993]  ? bio_chain_endio+0x2d/0x40
[1457468.880993]  ? md_end_io+0x5d/0x70
[1457468.880994]  ? bio_endio+0xe6/0x150
[1457468.880994]  ? bio_chain_endio+0x2d/0x40
[1457468.880994]  ? md_end_io+0x5d/0x70
[1457468.880994]  ? bio_endio+0xe6/0x150
[1457468.880995]  ? bio_chain_endio+0x2d/0x40
[1457468.880995]  ? md_end_io+0x5d/0x70
[1457468.880995]  ? bio_endio+0xe6/0x150
[1457468.880995]  ? bio_chain_endio+0x2d/0x40
[1457468.880996]  ? md_end_io+0x5d/0x70
[1457468.880996]  ? bio_endio+0xe6/0x150
[1457468.880996]  ? bio_chain_endio+0x2d/0x40
[1457468.880997]  ? md_end_io+0x5d/0x70
[1457468.880997]  ? bio_endio+0xe6/0x150
[1457468.880997]  ? bio_chain_endio+0x2d/0x40
[1457468.880997]  ? md_end_io+0x5d/0x70
[1457468.880998]  ? bio_endio+0xe6/0x150
[1457468.880998]  ? bio_chain_endio+0x2d/0x40
[1457468.880998]  ? md_end_io+0x5d/0x70
[1457468.880998]  ? bio_endio+0xe6/0x150
[1457468.880999]  ? bio_chain_endio+0x2d/0x40
[1457468.880999]  ? md_end_io+0x5d/0x70
[1457468.880999]  ? bio_endio+0xe6/0x150
[1457468.881000]  ? bio_chain_endio+0x2d/0x40
[1457468.881000]  ? md_end_io+0x5d/0x70
[1457468.881000]  ? bio_endio+0xe6/0x150
[1457468.881000]  ? bio_chain_endio+0x2d/0x40
[1457468.881001]  ? md_end_io+0x5d/0x70
[1457468.881001]  ? bio_endio+0xe6/0x150
[1457468.881001]  ? bio_chain_endio+0x2d/0x40
[1457468.881001]  ? md_end_io+0x5d/0x70
[1457468.881002]  ? bio_endio+0xe6/0x150
[1457468.881002]  ? bio_chain_endio+0x2d/0x40
[1457468.881002]  ? md_end_io+0x5d/0x70
[1457468.881003]  ? bio_endio+0xe6/0x150
[1457468.881003]  ? bio_chain_endio+0x2d/0x40
[1457468.881003]  ? md_end_io+0x5d/0x70
[1457468.881003]  ? bio_endio+0xe6/0x150
[1457468.881004]  ? bio_chain_endio+0x2d/0x40
[1457468.881004]  ? md_end_io+0x5d/0x70
[1457468.881004]  ? bio_endio+0xe6/0x150
[1457468.881004]  ? bio_chain_endio+0x2d/0x40
[1457468.881005]  ? md_end_io+0x5d/0x70
[1457468.881005]  ? bio_endio+0xe6/0x150
[1457468.881005]  ? bio_chain_endio+0x2d/0x40
[1457468.881006]  ? md_end_io+0x5d/0x70
[1457468.881006]  ? bio_endio+0xe6/0x150
[1457468.881006]  ? bio_chain_endio+0x2d/0x40
[1457468.881006]  ? md_end_io+0x5d/0x70
[1457468.881007]  ? bio_endio+0xe6/0x150
[1457468.881007]  ? bio_chain_endio+0x2d/0x40
[1457468.881007]  ? md_end_io+0x5d/0x70
[1457468.881007]  ? bio_endio+0xe6/0x150
[1457468.881008]  ? bio_chain_endio+0x2d/0x40
[1457468.881008]  ? md_end_io+0x5d/0x70
[1457468.881008]  ? bio_endio+0xe6/0x150
[1457468.881009]  ? bio_chain_endio+0x2d/0x40
[1457468.881009]  ? md_end_io+0x5d/0x70
[1457468.881009]  ? bio_endio+0xe6/0x150
[1457468.881009]  ? bio_chain_endio+0x2d/0x40
[1457468.881010]  ? md_end_io+0x5d/0x70
[1457468.881010]  ? bio_endio+0xe6/0x150
[1457468.881010]  ? bio_chain_endio+0x2d/0x40
[1457468.881010]  ? md_end_io+0x5d/0x70
[1457468.881011]  ? bio_endio+0xe6/0x150
[1457468.881011]  ? bio_chain_endio+0x2d/0x40
[1457468.881011]  ? md_end_io+0x5d/0x70
[1457468.881011]  ? bio_endio+0xe6/0x150
[1457468.881012]  ? bio_chain_endio+0x2d/0x40
[1457468.881012]  ? md_end_io+0x5d/0x70
[1457468.881012]  ? bio_endio+0xe6/0x150
[1457468.881013]  ? bio_chain_endio+0x2d/0x40
[1457468.881013]  ? md_end_io+0x5d/0x70
[1457468.881013]  ? bio_endio+0xe6/0x150
[1457468.881013]  ? bio_chain_endio+0x2d/0x40
[1457468.881014]  ? md_end_io+0x5d/0x70
[1457468.881014]  ? bio_endio+0xe6/0x150
[1457468.881014]  ? bio_chain_endio+0x2d/0x40
[1457468.881014]  ? md_end_io+0x5d/0x70
[1457468.881015]  ? bio_endio+0xe6/0x150
[1457468.881015]  ? bio_chain_endio+0x2d/0x40
[1457468.881015]  ? md_end_io+0x5d/0x70
[1457468.881016]  ? bio_endio+0xe6/0x150
[1457468.881016]  ? bio_chain_endio+0x2d/0x40
[1457468.881016]  ? md_end_io+0x5d/0x70
[1457468.881016]  ? bio_endio+0xe6/0x150
[1457468.881017]  ? bio_chain_endio+0x2d/0x40
[1457468.881017]  ? md_end_io+0x5d/0x70
[1457468.881017]  ? bio_endio+0xe6/0x150
[1457468.881017]  ? bio_chain_endio+0x2d/0x40
[1457468.881018]  ? md_end_io+0x5d/0x70
[1457468.881018]  ? bio_endio+0xe6/0x150
[1457468.881018]  ? bio_chain_endio+0x2d/0x40
[1457468.881019]  ? md_end_io+0x5d/0x70
[1457468.881019]  ? bio_endio+0xe6/0x150
[1457468.881019]  ? bio_chain_endio+0x2d/0x40
[1457468.881019]  ? md_end_io+0x5d/0x70
[1457468.881020]  ? bio_endio+0xe6/0x150
[1457468.881020]  ? bio_chain_endio+0x2d/0x40
[1457468.881020]  ? md_end_io+0x5d/0x70
[1457468.881020]  ? bio_endio+0xe6/0x150
[1457468.881021]  ? bio_chain_endio+0x2d/0x40
[1457468.881021]  ? md_end_io+0x5d/0x70
[1457468.881021]  ? bio_endio+0xe6/0x150
[1457468.881022]  ? bio_chain_endio+0x2d/0x40
[1457468.881022]  ? md_end_io+0x5d/0x70
[1457468.881022]  ? bio_endio+0xe6/0x150
[1457468.881022]  ? bio_chain_endio+0x2d/0x40
[1457468.881023]  ? md_end_io+0x5d/0x70
[1457468.881023]  ? bio_endio+0xe6/0x150
[1457468.881023]  ? bio_chain_endio+0x2d/0x40
[1457468.881023]  ? md_end_io+0x5d/0x70
[1457468.881024]  ? bio_endio+0xe6/0x150
[1457468.881024]  ? bio_chain_endio+0x2d/0x40
[1457468.881024]  ? md_end_io+0x5d/0x70
[1457468.881025]  ? bio_endio+0xe6/0x150
[1457468.881025]  ? bio_chain_endio+0x2d/0x40
[1457468.881025]  ? md_end_io+0x5d/0x70
[1457468.881025]  ? bio_endio+0xe6/0x150
[1457468.881026]  ? bio_chain_endio+0x2d/0x40
[1457468.881026]  ? md_end_io+0x5d/0x70
[1457468.881026]  ? bio_endio+0xe6/0x150
[1457468.881026]  ? bio_chain_endio+0x2d/0x40
[1457468.881027]  ? md_end_io+0x5d/0x70
[1457468.881027]  ? bio_endio+0xe6/0x150
[1457468.881027]  ? bio_chain_endio+0x2d/0x40
[1457468.881028]  ? md_end_io+0x5d/0x70
[1457468.881028]  ? bio_endio+0xe6/0x150
[1457468.881028]  ? bio_chain_endio+0x2d/0x40
[1457468.881028]  ? md_end_io+0x5d/0x70
[1457468.881029]  ? bio_endio+0xe6/0x150
[1457468.881029]  ? bio_chain_endio+0x2d/0x40
[1457468.881029]  ? md_end_io+0x5d/0x70
[1457468.881029]  ? bio_endio+0xe6/0x150
[1457468.881030]  ? bio_chain_endio+0x2d/0x40
[1457468.881030]  ? md_end_io+0x5d/0x70
[1457468.881030]  ? bio_endio+0xe6/0x150
[1457468.881030]  ? bi
[1457468.881031] Lost 306 message(s)!
[    0.000000] Linux version 5.8.0-53-generic (buildd@lgw01-amd64-020) (gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 2.35.1) #60-Ubuntu SMP Thu May 6 07:46:32 UTC 2021 (Ubuntu 5.8.0-53.60-generic 5.8.18)
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-5.8.0-53-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro console=tty1 console=ttyS0,115200 processor.max_cstate=5 rcu_nocbs=0-15