Following kernel warning is seen while booting 5.13.0-rc7-next-20210625
on POWER9 LPAR.
[ 40.573592] ------------[ cut here ]------------
[ 40.573604] WARNING: CPU: 6 PID: 4743 at arch/powerpc/kernel/interrupt.c:518 interrupt_exit_kernel_prepare+0x280/0x2a0
[ 40.573614] Modules linked in: dm_mod bonding nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set rfkill nf_tables libcrc32c nfnetlink sunrpc pseries_rng xts uio_pdrv_genirq uio vmx_crypto sch_fq_codel ip_tables ext4 mbcache jbd2 sd_mod t10_pi sg ibmvscsi ibmveth scsi_transport_srp fuse
[ 40.573649] CPU: 6 PID: 4743 Comm: dracut-install Not tainted 5.13.0-rc7-next-20210625 #1
[ 40.573655] NIP: c000000000032990 LR: c00000000000c958 CTR: 000000000048dd1c
[ 40.573660] REGS: c0000000414db640 TRAP: 0700 Not tainted (5.13.0-rc7-next-20210625)
[ 40.573664] MSR: 8000000000021033 <SF,ME,IR,DR,RI,LE> CR: 28044288 XER: 00000000
[ 40.573674] CFAR: c0000000000327a4 IRQMASK: 1
GPR00: c00000000000c958 c0000000414db8e0 c0000000029bbd00 c0000000414db9a0
GPR04: 8000000000001033 0000000000000093 0000000000000048 ffffffffffffffbf
GPR08: 0000000000000008 0000000000000000 0000000000000003 0000000000000010
GPR12: 0000000000004000 c000000005587a00 0000000101dc15a8 0000000101dc1590
GPR16: 0000000101dc05a8 00007fffc7abe353 00007fffb7926740 0000000000000000
GPR20: 00007fffc7ab7ae0 fffffffffffff000 0000000000000006 c000000043cbbc00
GPR24: 0000000000000000 000001003da495d0 0000000000000000 0000000000000000
GPR28: 0000000000000000 fcffffffffffffff 0000000000000000 c0000000414db9a0
[ 40.573725] NIP [c000000000032990] interrupt_exit_kernel_prepare+0x280/0x2a0
[ 40.573730] LR [c00000000000c958] interrupt_return_srr_user_restart+0x34/0x118
[ 40.573736] Call Trace:
[ 40.573738] [c0000000414db8e0] [c000000043cbbc00] 0xc000000043cbbc00 (unreliable)
[ 40.573744] [c0000000414db930] [c00000000000c958] interrupt_return_srr_user_restart+0x34/0x118
[ 40.573751] --- interrupt: 300 at strnlen_user+0x74/0x240
[ 40.573756] NIP: c00000000070ccf4 LR: c00000000048a460 CTR: 000000000003fffe
[ 40.573760] REGS: c0000000414db9a0 TRAP: 0300 Not tainted (5.13.0-rc7-next-20210625)
[ 40.573764] MSR: 8000000000001033 <SF,ME,IR,DR,RI,LE> CR: 48044228 XER: 20040000
[ 40.573774] CFAR: c00000000048a45c DAR: 000001003da495d0 DSISR: 40000000 IRQMASK: 0
GPR00: c00000000048a44c c0000000414dbc40 c0000000029bbd00 0000000000000000
GPR04: 0000000000200000 0000000000000030 c000000043cbbc00 000001003da495d0
GPR08: a8aaaaaaaaaaaaaa bcffffffffffffff 000001003da495d0 0000000000000000
GPR12: 0000000000004000 c000000005587a00 0000000101dc15a8 0000000101dc1590
GPR16: 0000000101dc05a8 00007fffc7abe353 00007fffb7926740 0000000000000000
GPR20: 00007fffc7ab7ae0 fffffffffffff000 0000000000000006 c000000043cbbc00
GPR24: 0000000000000000 000001003da495d0 0000000000000000 0000000000000000
GPR28: 0000000000000000 c000000043b6a000 c000000043cbbc00 0000000000000000
[ 40.573826] NIP [c00000000070ccf4] strnlen_user+0x74/0x240
[ 40.573830] LR [c00000000048a460] copy_strings.isra.42+0xb0/0x350
[ 40.573835] --- interrupt: 300
[ 40.573838] [c0000000414dbc40] [c00000007d7c0000] 0xc00000007d7c0000 (unreliable)
[ 40.573843] [c0000000414dbc70] [c00000000048a44c] copy_strings.isra.42+0x9c/0x350
[ 40.573849] [c0000000414dbd10] [c00000000048b60c] do_execveat_common.isra.44+0x1fc/0x240
[ 40.573855] [c0000000414dbd80] [c00000000048b6a4] sys_execve+0x54/0x70
[ 40.573860] [c0000000414dbdb0] [c0000000000322c0] system_call_exception+0x150/0x2d0
[ 40.573865] [c0000000414dbe10] [c00000000000c464] system_call_common+0xf4/0x258
[ 40.573871] --- interrupt: c00 at 0x7fffb76db8a8
[ 40.573875] NIP: 00007fffb76db8a8 LR: 00007fffb76dc488 CTR: 0000000000000000
[ 40.573878] REGS: c0000000414dbe80 TRAP: 0c00 Not tainted (5.13.0-rc7-next-20210625)
[ 40.573883] MSR: 800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 28044283 XER: 00000000
[ 40.573895] IRQMASK: 0
GPR00: 000000000000000b 00007fffc7ab7a00 00007fffb77f7300 00007fffc7ab7a20
GPR04: 00007fffc7ab7ae0 00007fffc7ab8b50 0000000000007063 0000000000000000
GPR08: ffff800038540059 0000000000000000 0000000000000000 0000000000000000
GPR12: 0000000000000000 00007fffb792d720 0000000101dc15a8 0000000101dc1590
GPR16: 0000000101dc05a8 00007fffc7abe353 00007fffb7926740 00007fffc7ab7a20
GPR20: 00007fffb7926740 000000000000002f 0000000000000000 0000000000000013
GPR24: 0000000000000003 00007fffc7abffa7 0000000000000001 00007fffc7ab8b50
GPR28: 00007fffc7ab7ae0 00007fffc7abffb0 0000000101dc1378 00007fffc7ab7a20
[ 40.573943] NIP [00007fffb76db8a8] 0x7fffb76db8a8
[ 40.573947] LR [00007fffb76dc488] 0x7fffb76dc488
[ 40.573950] --- interrupt: c00
[ 40.573952] Instruction dump:
[ 40.573955] 71290001 892d0933 61290001 992d0933 4082000c 392d0918 7c20492a 4bfe36dd
[ 40.573964] 60000000 4bfffe34 60000000 60000000 <0fe00000> 4bfffe14 60000000 60000000
[ 40.573973] ---[ end trace 604b708523af26f5 ]—
I cannot consistently recreate this problem.
next-20210624 was good.
Last patch that touched this code was 6eaaf9de3599.
Thanks
-Sachin
