On Tue, Nov 30, 2021 at 06:46:22PM +1100, Stephen Rothwell wrote:
> Hi all,
>
> After merging the akpm tree, today's linux-next boot test (powerpc
> pseries_le_defconfig) failed like this:
>
> [ 0.025828][ T0] pid_max: default: 32768 minimum: 301
> [ 0.028445][ T0] Mount-cache hash table entries: 8192 (order: 0, 65536 bytes, linear)
> [ 0.028636][ T0] Mountpoint-cache hash table entries: 8192 (order: 0, 65536 bytes, linear)
> [ 0.055344][ T0] BUG: Unable to handle kernel data access on write at 0x2000000b7
> [ 0.056649][ T0] Faulting instruction address: 0xc00000000057435c
> [ 0.057458][ T0] Oops: Kernel access of bad area, sig: 11 [#1]
> [ 0.057734][ T0] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
> [ 0.058250][ T0] Modules linked in:
> [ 0.058816][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc3 #2
> [ 0.059410][ T0] NIP: c00000000057435c LR: c000000000577f54 CTR: 0000000000000003
> [ 0.059608][ T0] REGS: c000000002787a80 TRAP: 0380 Not tainted (5.16.0-rc3)
> [ 0.059999][ T0] MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 44000288 XER: 20000000
> [ 0.060654][ T0] CFAR: c000000000574464 IRQMASK: 0
> [ 0.060654][ T0] GPR00: c000000000577f54 c000000002787d20 c000000002788500 c00000000252d5e8
> [ 0.060654][ T0] GPR04: c000000000e42500 c00000000252d5e8 0000000000000000 c0000000073a02c9
> [ 0.060654][ T0] GPR08: c000000000e42380 c000000000f89d48 c00000000274f700 ffffffffffffffff
> [ 0.060654][ T0] GPR12: 0000000000000000 c000000002970000 0000000000000000 0000000000000000
> [ 0.060654][ T0] GPR16: 0000000002bf00d0 000000000135bfd8 0000000000000000 0000000000000000
> [ 0.060654][ T0] GPR20: c00000000252d6e8 c00000000252d740 0000000000000006 0000000000000000
> [ 0.060654][ T0] GPR24: 0000000000000000 0000000000000002 c000000002662eb8 c00000000252d5e8
> [ 0.060654][ T0] GPR28: 00000002000000b7 c000000001004108 0000000000000000 c00000000252d5c0
> [ 0.062938][ T0] NIP [c00000000057435c] count_subheaders.part.0+0x9c/0x2b0
> [ 0.064395][ T0] LR [c000000000577f54] __register_sysctl_paths+0x64/0x320
> [ 0.065201][ T0] Call Trace:
> [ 0.065521][ T0] [c000000002787dc0] [c000000000577f54] __register_sysctl_paths+0x64/0x320
> [ 0.065960][ T0] [c000000002787e40] [c0000000005782a4] __register_sysctl_base+0x34/0x50
> [ 0.066570][ T0] [c000000002787e60] [c0000000020259bc] sysctl_init_bases+0x34/0x74
> [ 0.066960][ T0] [c000000002787e90] [c000000002041744] proc_sys_init+0x54/0x68
> [ 0.067306][ T0] [c000000002787eb0] [c0000000020410dc] proc_root_init+0xb8/0xdc
> [ 0.067763][ T0] [c000000002787ed0] [c0000000020044fc] start_kernel+0x838/0x8cc
> [ 0.068171][ T0] [c000000002787f90] [c00000000000d39c] start_here_common+0x1c/0x600
> [ 0.068782][ T0] Instruction dump:
> [ 0.069295][ T0] f821ff61 eab40018 2c350000 418201c8 e9350000 2c290000 4182020c 3b000000
> [ 0.069694][ T0] 3a600000 eb950018 2c3c0000 41820198 <e93c0000> 2c290000 418201dc 3b200000
> [ 0.071747][ T0] ---[ end trace df5d37c8b563422a ]---
> [ 0.071967][ T0]
> [ 1.073058][ T0] Kernel panic - not syncing: Attempted to kill the idle task!
>
> Bisected to commit
>
> f00ff38c1dfa ("sysctl: add and use base directory declarer and registration helper")
>
> I have reverted that complete 6 patch series for today.
I'll be trying to reproduce and fix, thanks for the report!
Luis
