[ 11.928059] Serial: 8250/16550 driver $revision: 1.90 $ 4 ports, IRQ sharing enabled
[ 11.931106] pnp: Device 00:0b activated
[ 11.931701] 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 11.933461] ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11
[ 11.933522] ACPI: PCI Interrupt 0000:00:0a.1[A] -> Link [LNKC] -> GSI 11 (level, low) -> IRQ 11



OTHER HANG POINT

[ 15.766383] Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
[ 15.780084] pnp: Device 00:0f activated.
[ 15.780510] 00:0f: ttyS0 at I/O 0x3f8 (irq=4) is a 16550A
[ 15.781322] PCI: Found IRQ 11 for device 0000:00:0a.1
[ 15.781396] PCI: Sharing IRQ 11 with 0000:00:0a.0