Hi all,
On Wed, 13 Jan 2021 16:29:48 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> After merging the iomem-mmap-vs-gup tree, today's linux-next boot test
> (powerpc pseries_le_defconfig) failed like this:
>
> EEH: pSeries platform initialized
> PCI: Probing PCI hardware
> BUG: Kernel NULL pointer dereference on write at 0x00000030
> Faulting instruction address: 0xc00000000013bf4c
> Oops: Kernel access of bad area, sig: 11 [#1]
> LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc3 #2
> NIP: c00000000013bf4c LR: c0000000007a9ee8 CTR: 0000000000000000
> REGS: c0000000063a3610 TRAP: 0380 Not tainted (5.11.0-rc3)
> MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 84002440 XER: 00000000
> CFAR: c0000000007a9ee4 IRQMASK: 0
> GPR00: c0000000007a9ee8 c0000000063a38b0 c0000000013d8100 c000000006061300
> GPR04: 0000000000000000 0000000000000b20 c000000000f11738 000000000000ffff
> GPR08: c0000000007a7ab0 0000000000000000 c0000000007a7a40 2d6770696f730000
> GPR12: 0000000000000000 c0000000015b0000 c000000000013120 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR24: c000000006210de8 c000000006167120 c000000006620b20 0000000000000000
> GPR28: c000000006167120 0000000000000180 c000000006061300 c000000006167000
> NIP [c00000000013bf4c] iomem_get_mapping+0x1c/0x30
> LR [c0000000007a9ee8] pci_create_legacy_files+0xa8/0x1c0
> Call Trace:
> [c0000000063a38b0] [c0000000007a9e84] pci_create_legacy_files+0x44/0x1c0 (unreliable)
> [c0000000063a3930] [c000000000795198] pci_register_host_bridge+0x288/0x510
> [c0000000063a3a60] [c000000000795514] pci_create_root_bus+0xf4/0x150
> [c0000000063a3ac0] [c00000000006d424] pcibios_scan_phb+0xe4/0x270
> [c0000000063a3b70] [c000000001010b40] pcibios_init+0x8c/0x128
> [c0000000063a3bf0] [c000000000012b70] do_one_initcall+0x60/0x2c0
> [c0000000063a3cc0] [c0000000010046b4] kernel_init_freeable+0x2e8/0x380
> [c0000000063a3da0] [c000000000013144] kernel_init+0x2c/0x168
> [c0000000063a3e10] [c00000000000dff0] ret_from_kernel_thread+0x5c/0x6c
> Instruction dump:
> 7c634850 4e800020 60000000 60000000 60420000 3c4c012a 3842c1d0 7c0802a6
> 60000000 3d22000d e929caf8 7c2004ac <e8690030> 4e800020 60000000 60000000
> ---[ end trace 77f55ece72f02708 ]---
>
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> Caused by commit
>
> 85482fbab59e ("PCI: Revoke mappings like devmem")
>
> Reverting that commit fixes the boot, so I have done that for today.
I am still reverting this commit.
--
Cheers,
Stephen Rothwell
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