[BUG] audit/powerpc: WARNING at kernel/auditsc.c:1995 (__audit_syscall_entry) during BPF kselftests (test_progs)

Hi all,

IBM CI has reported a kernel warning triggered in 
__audit_syscall_entry() on a PowerPC 64 (ppc64le, POWER9 pSeries guest) 
system while running the BPF kselftest suite (test_progs).

Environment:


Kernel version: 7.3.0-rc3-g238650ef6c7c (PREEMPT)
Architecture: ppc64le (POWER9 - IBM,8375-42A pSeries / phyp)
Workload: BPF selftests (tools/testing/selftests/bpf/test_progs)


Problem Description:


During syscall entry processing (system_call_exception -> 
syscall_enter_audit -> __audit_syscall_entry), the kernel hit 
WARN_ON(context->context != AUDIT_CTX_UNUSED) at kernel/auditsc.c:1995, 
indicating that the task's audit context was not reset to 
AUDIT_CTX_UNUSED prior to entering the new syscall.

Trace:


[ 1371.387510] ------------[ cut here ]------------
[ 1371.387528] WARNING: kernel/auditsc.c:1995 at 
__audit_syscall_entry+0x50/0x1b0, CPU#17: test_progs/49616
[ 1371.387539] Modules linked in: dm_verity(E) dm_bufio(E) 
reed_solomon(E) livepatch_sample(EK) tun(E) vrf(E) 8021q(E) garp(E) 
mrp(E) stp(E) llc(E) veth(E) bonding(E) tls(E) rfkill(E) nft_fib_inet(E) 
nft_fib_ipv4(E) nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) 
nf_reject_ipv4(E) nf_reject_ipv6(E) nft_reject(E) nft_ct(E) 
nft_chain_nat(E) hvcs(E) hvcserver(E) pseries_rng(E) vmx_crypto(E) sg(E) 
drm(E) fuse(E) drm_panel_orientation_quirks(E) xfs(E) sr_mod(E) 
nvme_tcp(E) sd_mod(E) cdrom(E) nvme_fabrics(E) nvme_core(E) ibmvscsi(E) 
ibmveth(E) scsi_transport_srp(E) dm_mirror(E) dm_region_hash(E) 
dm_log(E) dm_mod(E) [last unloaded: bpf_test_modorder_x(OE)]
[ 1371.387607] CPU: 17 UID: 0 PID: 49616 Comm: test_progs Tainted: G    
        OE K     7.3.0-rc3-g238650ef6c7c #1 PREEMPT
[ 1371.387616] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE, [K]=LIVEPATCH
[ 1371.387620] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 
0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries
[ 1371.387626] NIP:  c0000000003e70d0 LR: c000000000352080 CTR: 
c00000000000cf00
[ 1371.387631] REGS: c00000000beafaa0 TRAP: 0700   Tainted: G      OE K  
     (7.3.0-rc3-g238650ef6c7c)
[ 1371.387637] MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 
48002824  XER: 20040084
[ 1371.387650] CFAR: c00000000035207c IRQMASK: 0
                GPR00: c000000000034958 c00000000beafd40 
c0000000020eb200 c0000000345f4800
                GPR04: 00007fffe2a31184 0000000000000081 
000000007fffffff 0000000000000000
                GPR08: 0000000000000000 0000000000000001 
0000000000000001 00000000000000dd
                GPR12: 0000000000000000 c00000002e99b300 
0000000000000000 0000000000000000
                GPR16: 0000000000000000 0000000000000000 
0000000000000000 0000000000000000
                GPR20: 0000000000000000 0000000000000000 
0000000000000000 0000000000000000
                GPR24: 0000000000000000 0000000000000000 
0000000000000000 c0000000345f4800
                GPR28: 0000000000000000 00000000000000dd 
00000000000000dd c000000138e0c000
[ 1371.387710] NIP [c0000000003e70d0] __audit_syscall_entry+0x50/0x1b0
[ 1371.387715] LR [c000000000352080] syscall_enter_audit+0x90/0xd0
[ 1371.387722] Call Trace:
[ 1371.387725] [c00000000beafd40] [c000000000937050] 
selinux_task_getpgid+0x80/0xa0 (unreliable)
[ 1371.387735] [c00000000beafda0] [c00000000beafde0] 0xc00000000beafde0
[ 1371.387741] [c00000000beafe00] [c000000000034958] 
system_call_exception+0x448/0x480
[ 1371.387749] [c00000000beafe50] [c00000000000d05c] 
system_call_vectored_common+0x15c/0x2ec
[ 1371.387757] ---- interrupt: 3000 at 0x7fffab74cbf0


Please let me know if additional logs, config, or repro details are needed.

Regards,

Venkat.