Public bug reported:
kernel get stucks at boot if console=ttyS* is specified in the kernel
cmdline and that serial HW isn't available on the system.
Reproduced with:
4.4 (from Xenial), 4.15 (from Bionic), 5.4 (native, Focal) and 5.7-next
(mainline)
Removing the non-existent 'console=ttyS*' parameter fixes the situation.
I tested it using KVM/qemu, but it has been brought to my attention that
it was reproducible in VMware as well.
I think it is safe to say that it is unlikely to be specifics to a
certain virtualization technology type.
Didn't test on baremetal yet.
** Affects: linux (Ubuntu)
Importance: High
Assignee: Guilherme G. Piccoli (gpiccoli)
Status: Confirmed
** Tags: seg sts
** Tags added: seg sts
** Description changed:
kernel get stucks at boot if console=ttyS* is specified in the kernel
cmdling and that serial HW isn't available on the system.
- Reproduced using Ubuntu kernel (Bionic/v4.15) and mainline kernel v5.6
- for now.
+ Reproduced with:
+ 4.4 (from Xenial), 4.15 (from Bionic), 5.4 (native, Focal) and 5.7-next
(mainline)
Removing the non-existent 'console=ttyS*' fixes the situation.
I tested it using KVM/qemu, but it has been brought to my attention that
it was reproducible in VMware as well.
I think it is safe to say that it is unlikely to be specifics to a
certain virtualization technology type.
Didn't test on baremetal, but I would suspect the same behaviour (until
I'm proving wrong).
** Description changed:
kernel get stucks at boot if console=ttyS* is specified in the kernel
- cmdling and that serial HW isn't available on the system.
+ cmdline and that serial HW isn't available on the system.
Reproduced with:
4.4 (from Xenial), 4.15 (from Bionic), 5.4 (native, Focal) and 5.7-next
(mainline)
Removing the non-existent 'console=ttyS*' fixes the situation.
I tested it using KVM/qemu, but it has been brought to my attention that
it was reproducible in VMware as well.
I think it is safe to say that it is unlikely to be specifics to a
certain virtualization technology type.
Didn't test on baremetal, but I would suspect the same behaviour (until
I'm proving wrong).
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https://bugs.launchpad.net/bugs/1879987
Title:
kernel get stuck at boot if specified 'console=ttyS* ' doesn't exist.
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