-----Original Message----- From: juri.lelli@redhat.com juri.lelli@redhat.com Sent: Friday, March 14, 2025 6:06 PM To: Ma, Jiping Jiping.Ma2@windriver.com Cc: gregkh@linuxfoundation.org; peterz@infradead.org; sashal@kernel.org; stable@vger.kernel.org; wander@redhat.com; mingo@redhat.com; vincent.guittot@linaro.org; dietmar.eggemann@arm.com; rostedt@goodmis.org; bsegall@google.com; mgorman@suse.de; vschneid@redhat.com; linux-kernel@vger.kernel.org; jiping.ma2@windirvier.com; Tao, Yue Yue.Tao@windriver.com Subject: Re: sched/deadline: warning in migrate_enable for boosted tasks

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Hello,

On 14/03/25 04:02, Ma, Jiping wrote:

Hi, All

We encounter this kernel warning, it looks similar with the one you are discussing [PATCH 6.6 331/356] sched/deadline: Fix warning in migrate_enable for boosted tasks - Greg Kroah-Hartmanhttps://lore.kernel.org/all/20241212144257.639344223@linuxfoundation.org/. Do you have any idea for the issue?

kernel: warning [ 998.494702] WARNING: CPU: 19 PID: 217 at kernel/sched/deadline.c:277 dequeue_task_dl+0x16c/0x1f0 kernel: warning [ 998.494705] Modules linked in: iptable_nat ceph netfs macvlan igb_uio(O) uio nbd rbd libceph dns_resolver nf_conntrack_netlink nfnetlink_queue xt_NFQUEUE xt_set xt_multiport ipt_rpfilter ip6t_rpfilter ip_set_hash_net ip_set_hash_ip ip_set veth wireguard libchacha20poly1305 chacha_x86_64 poly1305_x86_64 curve25519_x86_64 libcurve25519_generic libchacha xt_nat xt_MASQUERADE xt_mark ipt_REJECT nf_reject_ipv4 nft_chain_nat nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_comment vfio_pci vfio_pci_core binfmt_misc iscsi_target_mod target_core_mod drbd dm_crypt trusted asn1_encoder xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge virtio_net net_failover failover nfsd auth_rpcgss nfs_acl lockd grace overlay 8021q garp stp mrp llc xfs vfio_iommu_type1 vfio sctp ip6_udp_tunnel udp_tunnel xprtrdma(O) svcrdma(O) rpcrdma(O) nvmet_rdma(O) nvme_rdma(O) ib_srp(O) ib_isert(O) ib_iser(O) rdma_rxe(O) mlx5_ib(O) mlx5_core(O) mlxfw(O) mlxdevm(O) psample tls macsec rdma_ucm(O) rdma_cm(O) iw_cm(O) kernel: warning [ 998.494748] ib_uverbs(O) ib_ucm(O) ib_cm(O) lru_cache libcrc32c fuse drm sunrpc efivarfs ip_tables ext4 mbcache jbd2 dm_multipath dm_mod sd_mod t10_pi crc64_rocksoft_generic crc64_rocksoft crc64 iTCO_wdt wmi_bmof iTCO_vendor_support dell_smbios dell_wmi_descriptor ledtrig_audio rfkill video intel_uncore_frequency intel_uncore_frequency_common x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul bnxt_re(O) crc32_pclmul crc32c_intel ghash_clmulni_intel sha512_ssse3 ib_core(O) rapl mlx_compat(O) uas intel_cstate intel_uncore acpi_ipmi mei_me ahci i2c_i801 bnxt_en(O) usb_storage i2c_smbus intel_pch_thermal mei libahci intel_vsec wmi ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter iavf(O) i40e(O) ice(O) [last unloaded: drbd] kernel: warning [ 998.494781] CPU: 19 PID: 217 Comm: ktimers/19 Kdump: loaded Tainted: G W O 6.6.0-1-rt-amd64 #1 Debian 6.6.52-1.stx.95 kernel: warning [ 998.494783] Hardware name: Dell Inc. PowerEdge XR11/0P2RNT, BIOS 1.15.2 09/10/2024 kernel: warning [ 998.494784] RIP: 0010:dequeue_task_dl+0x16c/0x1f0 kernel: warning [ 998.494786] Code: 48 c7 c7 e0 eb 89 ae c6 05 fd a2 6d 01 01 e8 9b ac f9 ff 0f 0b eb 81 48 c7 c7 c5 39 83 ae c6 05 e7 a2 6d 01 01 e8 84 ac f9 ff <0f> 0b 48 8b 83 28 09 00 00 49 39 c5 0f 83 53 ff ff ff 48 c7 83 28 kernel: warning [ 998.494788] RSP: 0000:ff32fa3140adbca8 EFLAGS: 00010082 kernel: warning [ 998.494790] RAX: 0000000000000000 RBX: ff2ef1f93faf23c0 RCX: ff2ef1f93fae0608 kernel: warning [ 998.494791] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ff2ef1f93fae0600 kernel: warning [ 998.494793] RBP: ff2ef1e9c19eaf80 R08: 0000000000000000 R09: ff32fa3140adbc30 kernel: warning [ 998.494794] R10: 0000000000000001 R11: 0000000000000015 R12: 000000000000000e kernel: warning [ 998.494795] R13: 0000000000000000 R14: 00000000ffffffff R15: 000000000000000e kernel: warning [ 998.494796] FS: 0000000000000000(0000) GS:ff2ef1f93fac0000(0000) knlGS:0000000000000000 kernel: warning [ 998.494798] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: warning [ 998.494799] CR2: 00000000181b50a0 CR3: 000000063db68005 CR4: 0000000000771ee0 kernel: warning [ 998.494801] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kernel: warning [ 998.494802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kernel: warning [ 998.494803] PKRU: 55555554 kernel: warning [ 998.494804] Call Trace: kernel: warning [ 998.494805] <TASK> kernel: warning [ 998.494805] ? __warn+0x89/0x140 kernel: warning [ 998.494808] ? dequeue_task_dl+0x16c/0x1f0 kernel: warning [ 998.494810] ? report_bug+0x198/0x1b0 kernel: warning [ 998.494814] ? handle_bug+0x3c/0x70 kernel: warning [ 998.494816] ? exc_invalid_op+0x18/0x70 kernel: warning [ 998.494818] ? asm_exc_invalid_op+0x1a/0x20 kernel: warning [ 998.494821] ? dequeue_task_dl+0x16c/0x1f0 kernel: warning [ 998.494823] ? dequeue_task_dl+0x16c/0x1f0 kernel: warning [ 998.494825] rt_mutex_setprio+0x240/0x460 kernel: warning [ 998.494828] rt_mutex_slowunlock+0x143/0x280 kernel: warning [ 998.494831] ? __pfx_mce_timer_fn+0x10/0x10 kernel: warning [ 998.494833] mce_timer_fn+0x90/0xe0 kernel: warning [ 998.494835] ? __pfx_mce_timer_fn+0x10/0x10 kernel: warning [ 998.494837] call_timer_fn+0x24/0x130 kernel: warning [ 998.494840] expire_timers+0xd3/0x1c0

Not sure it's the same issue. Stacktrace looks different. Anyway, are you maybe able to verify if the issue is still reproducible with latest v6.6-rt stable (v6.6.78-rt51 at the time of writing)?

Looks like you are on v6.6-rt, thus the question.

-------Yes, we use v6.6.52-rt. It is not easy to reproduce. We will try to test it with v6.6.78-rt51.

Thanks, Juri