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<0>[  268.689622] Kernel panic - not syncing: DMAR hardware is malfunctioning
<0>[  268.690814] Kernel Offset: disabled
<4>[  268.691746] CPU: 0 PID: 1 Comm: systemd-shutdow Tainted: G     U  W         5.5.0-rc4-CI-CI_DRM_7666+ #1
<4>[  268.692702] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP, BIOS ICLSFWR1.R00.3234.A01.1906141750 06/14/2019
<4>[  268.693719] Call Trace:
<4>[  268.694661]  dump_stack+0x71/0x9b
<4>[  268.695624]  panic+0x132/0x2d3
<4>[  268.696588]  iommu_disable_translation+0x7b/0x80
<4>[  268.697532]  intel_iommu_shutdown+0x75/0x90
<4>[  268.698545]  native_machine_restart+0x22/0x40
<4>[  268.699457]  __do_sys_reboot+0x184/0x1f0
<4>[  268.700491]  ? task_work_run+0x6e/0xb0
<4>[  268.701471]  ? lockdep_hardirqs_off+0x79/0xd0
<4>[  268.702507]  ? trace_hardirqs_off_thunk+0x1a/0x1c
<4>[  268.703406]  do_syscall_64+0x4f/0x220
<4>[  268.704323]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4>[  268.705350] RIP: 0033:0x7f633c101839
<4>[  268.706368] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
<4>[  268.707437] RSP: 002b:00007ffdacf1add8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a9
<4>[  268.708547] RAX: ffffffffffffffda RBX: 0000562c818fc040 RCX: 00007f633c101839
<4>[  268.709663] RDX: 00000000a1b2c3d4 RSI: 0000000028121969 RDI: 00000000fee1dead
<4>[  268.710742] RBP: 00007ffdacf1ae40 R08: 0000000000000000 R09: 00007ffdacf1aee0
<4>[  268.711771] R10: 0000562c818fc040 R11: 0000000000000246 R12: 00007ffdacf1ae48
<4>[  268.712826] R13: 0000000000000000 R14: 0000001b00000004 R15: 00007ffdacf1b138