On Thu, 24 Nov 2022 09:37:27 +0100, Christophe Leroy wrote:
> test_bpf tail call tests end up as:
>
> test_bpf: #0 Tail call leaf jited:1 85 PASS
> test_bpf: #1 Tail call 2 jited:1 111 PASS
> test_bpf: #2 Tail call 3 jited:1 145 PASS
> test_bpf: #3 Tail call 4 jited:1 170 PASS
> test_bpf: #4 Tail call load/store leaf jited:1 190 PASS
> test_bpf: #5 Tail call load/store jited:1
> BUG: Unable to handle kernel data access on write at 0xf1b4e000
> Faulting instruction address: 0xbe86b710
> Oops: Kernel access of bad area, sig: 11 [#1]
> BE PAGE_SIZE=4K MMU=Hash PowerMac
> Modules linked in: test_bpf(+)
> CPU: 0 PID: 97 Comm: insmod Not tainted 6.1.0-rc4+ #195
> Hardware name: PowerMac3,1 750CL 0x87210 PowerMac
> NIP: be86b710 LR: be857e88 CTR: be86b704
> REGS: f1b4df20 TRAP: 0300 Not tainted (6.1.0-rc4+)
> MSR: 00009032 <EE,ME,IR,DR,RI> CR: 28008242 XER: 00000000
> DAR: f1b4e000 DSISR: 42000000
> GPR00: 00000001 f1b4dfe0 c11d2280 00000000 00000000 00000000 00000002 00000000
> GPR08: f1b4e000 be86b704 f1b4e000 00000000 00000000 100d816a f2440000 fe73baa8
> GPR16: f2458000 00000000 c1941ae4 f1fe2248 00000045 c0de0000 f2458030 00000000
> GPR24: 000003e8 0000000f f2458000 f1b4dc90 3e584b46 00000000 f24466a0 c1941a00
> NIP [be86b710] 0xbe86b710
> LR [be857e88] __run_one+0xec/0x264 [test_bpf]
> Call Trace:
> [f1b4dfe0] [00000002] 0x2 (unreliable)
> Instruction dump:
> XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
> XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
> ---[ end trace 0000000000000000 ]---
>
> [...]
Applied to powerpc/fixes.
[1/1] powerpc/bpf/32: Fix Oops on tail call tests
https://git.kernel.org/powerpc/c/89d21e259a94f7d5582ec675aa445f5a79f347e4
cheers
