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(Postfix) with ESMTP; Thu, 1 Jun 2023 10:46:54 +0000 (GMT) From: Sachin Sant Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.500.231\)) Subject: WARN at kernel/sched/core.c:5358 (kthread_end_lazy_tlb_mm) Message-Id: Date: Thu, 1 Jun 2023 16:16:43 +0530 To: linuxppc-dev X-Mailer: Apple Mail (2.3731.500.231) X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: mYNYI3lrSvQ52vgJP9gM-vzaciXvA4Bk X-Proofpoint-GUID: xaJAlDQbVfMYXcbI5JtPKAU_Le48AQhS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-01_07,2023-05-31_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=918 impostorscore=0 spamscore=0 clxscore=1011 phishscore=0 suspectscore=0 bulkscore=0 malwarescore=0 mlxscore=0 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2306010095 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Nick Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" While compiling a kernel on a IBM Power system booted with 6.4.0-rc4-next-20230601 following warning is observed [ 276.351697] ------------[ cut here ]------------ [ 276.351709] WARNING: CPU: 27 PID: 9237 at kernel/sched/core.c:5358 = kthread_end_lazy_tlb_mm+0x90/0xa0 [ 276.351719] Modules linked in: dm_mod nft_fib_inet nft_fib_ipv4 = nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 = nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 = nf_defrag_ipv4 bonding tls rfkill ip_set nf_tables nfnetlink sunrpc = pseries_rng aes_gcm_p10_crypto xfs libcrc32c sd_mod sr_mod t10_pi = crc64_rocksoft_generic cdrom crc64_rocksoft crc64 sg ibmvscsi = scsi_transport_srp ibmveth vmx_crypto fuse [ 276.351752] CPU: 27 PID: 9237 Comm: cc1 Kdump: loaded Not tainted = 6.4.0-rc4-next-20230601 #1 [ 276.351756] Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 = 0xf000006 of:IBM,FW1030.20 (NH1030_058) hv:phyp pSeries [ 276.351759] NIP: c0000000001b8c10 LR: c0000000000a8d54 CTR: = c00000000046ec00 [ 276.351763] REGS: c0000000dce337d0 TRAP: 0700 Not tainted = (6.4.0-rc4-next-20230601) [ 276.351766] MSR: 8000000000029033 CR: = 24002228 XER: 00000000 [ 276.351774] CFAR: c0000000001b8ba0 IRQMASK: 0 [ 276.351774] GPR00: = c0000000000a8d54 c0000000dce33a70 c0000000014a1800 c000000007852a00 [ = 276.351774] GPR04: 0000000000000001 ffffffffffffffff 0000000000000000 = c000000007852f78 [ 276.351774] GPR08: 0000000000000000 = 0000000000000000 0000000000000000 0000000024002428 [ 276.351774] = GPR12: c0000000a032b608 c00000135faa5b00 0000000000000000 = 0000000000000000 [ 276.351774] GPR16: 0000000000000000 = 0000000000000000 0000000000000000 0000000000000000 [ 276.351774] = GPR20: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000 [ 276.351774] GPR24: 0000000000000000 = 0000000000000000 0000000000000000 c000000007852a70 [ 276.351774] = GPR28: 0000000000000000 0000000000000000 000000000000001b = c000000007852a00 [ 276.351810] NIP [c0000000001b8c10] = kthread_end_lazy_tlb_mm+0x90/0xa0 [ 276.351814] LR [c0000000000a8d54] exit_lazy_flush_tlb+0xf4/0x110 [ 276.351818] Call Trace: [ 276.351820] [c0000000dce33a70] [0000000000000001] 0x1 (unreliable) [ 276.351825] [c0000000dce33ab0] [c0000000000a8fbc] = flush_type_needed+0x24c/0x260 [ 276.351829] [c0000000dce33af0] [c0000000000a91a8] = __flush_all_mm+0x48/0x2c0 [ 276.351833] [c0000000dce33b40] [c0000000004d6dcc] = tlb_finish_mmu+0x16c/0x230 [ 276.351839] [c0000000dce33b70] [c0000000004d2a2c] = exit_mmap+0x17c/0x4c0 [ 276.351844] [c0000000dce33c90] [c000000000159120] __mmput+0x60/0x1e0 [ 276.351849] [c0000000dce33cc0] [c0000000001689cc] exit_mm+0xdc/0x170 [ 276.351853] [c0000000dce33d00] [c000000000168cec] do_exit+0x28c/0x580 [ 276.351857] [c0000000dce33db0] [c00000000016922c] = do_group_exit+0x4c/0xc0 [ 276.351861] [c0000000dce33df0] [c0000000001692c8] = sys_exit_group+0x28/0x30 [ 276.351866] [c0000000dce33e10] [c000000000034adc] = system_call_exception+0x13c/0x340 [ 276.351871] [c0000000dce33e50] [c00000000000d05c] = system_call_vectored_common+0x15c/0x2ec [ 276.351876] --- interrupt: 3000 at 0x7fffa330c2c4 [ 276.351879] NIP: 00007fffa330c2c4 LR: 0000000000000000 CTR: = 0000000000000000 [ 276.351882] REGS: c0000000dce33e80 TRAP: 3000 Not tainted = (6.4.0-rc4-next-20230601) [ 276.351885] MSR: 800000000280f033 = CR: 44002422 XER: 00000000 [ 276.351894] IRQMASK: 0 [ 276.351894] GPR00: 00000000000000ea = 00007fffed1a4ca0 00007fffa3a77e00 0000000000000000 [ 276.351894] = GPR04: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000 [ 276.351894] GPR08: 0000000000000000 = 0000000000000000 0000000000000000 0000000000000000 [ 276.351894] = GPR12: 0000000000000000 00007fffa3a7cac0 0000000000000000 = 0000000000000000 [ 276.351894] GPR16: 0000000000000000 = 0000000000000000 0000000000000000 0000000000000000 [ 276.351894] = GPR20: 0000000000000000 0000000000000000 000000000000003a = 0000000000000001 [ 276.351894] GPR24: 00007fffa34423c0 = 0000000000000000 00007fffa3440a38 0000000000000000 [ 276.351894] = GPR28: 0000000000000001 00007fffa3a75e48 fffffffffffff000 = 0000000000000000 [ 276.351928] NIP [00007fffa330c2c4] 0x7fffa330c2c4 [ 276.351930] LR [0000000000000000] 0x0 [ 276.351932] --- interrupt: 3000 [ 276.351935] Code: 38210020 e8010010 7c0803a6 4e800020 0fe00000 = 60000000 60000000 60000000 4e800020 60000000 60000000 60000000 = <0fe00000> 60000000 60000000 60000000 [ 276.351946] ---[ end trace = 0000000000000000 ]=E2=80=94 Git bisect points to following code change: commit 253808d464bf472c66d299faa3d8ffb65149f4da lazy tlb: consolidate lazy tlb mm switching - Sachin