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Message-ID: <43bcc782-4aa5-4957-a5ab-73184da29147@linux.ibm.com>
Date: Wed, 4 Jun 2025 13:52:46 +0200
From: Zaslonko Mikhail <zaslonko@...ux.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-s390@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Heiko Carstens <hca@...ux.ibm.com>
Subject: kernel/sched/core: WARNING when migrating to an offline CPU
Hi Peter,
This WARN_ON has been introduced by you a while ago:
https://lore.kernel.org/all/20170907150614.094206976@infradead.org/
It seems we had a hit on s390 recently followed by a kernel panic while running stress tests on Fedora42 with the latest kernel.
Not sure we can reproduce it easily since the stress workload varies each time.
[248217.530550] ------------[ cut here ]------------
[248217.530560] WARNING: CPU: 76 PID: 469721 at kernel/sched/core.c:3334 set_task_cpu+0x1e2/0x200
[248217.530567] Modules linked in: algif_hash af_alg 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 mlx5_ib ib_uverbs ib_core mlx5_vdpa vdpa vringh vhost_iotlb ip_set nf_tables mlx5_core s390_trng vfio_ccw mdev eadm_sch vfio_iommu_type1 vfio sch_fq_codel drm i2c_core loop configfs drm_panel_orientation_quirks nfnetlink ctcm fsm zfcp scsi_transport_fc uvdevice diag288_wdt hmac_s390 ghash_s390 prng aes_s390 des_s390 libdes sha3_512_s390 sha3_256_s390 sha512_s390 sha256_s390 sha1_s390 sha_common paes_s390 crypto_engine pkey_cca pkey_ep11 zcrypt rng_core pkey_pckmo pkey autofs4 ecdsa_generic ecc
[248217.530624] CPU: 76 UID: 0 PID: 469721 Comm: stress-ng-timer Not tainted 6.16.0-20250526.rc0.git4.b871b0f876d9.63.fc42.s390x #1 NONE
[248217.530629] Hardware name: IBM 9175 ME1 701 (LPAR)
[248217.530631] Krnl PSW : 0404c00180000000 00000289d49b07f6 (set_task_cpu+0x1e6/0x200)
[248217.530636] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
[248217.530639] Krnl GPRS: 0000000000000000 0000000000000000 00000289d62cdd28 000000000000000a
[248217.530642] 00000289d62e8e50 00000289d62ca198 000000fbffffffff 0000000000000001
[248217.530644] 7d48be6d37ef83d1 001f522f9b4dfbe0 000000000000000a 000000e88736a300
[248217.530647] 000003ffa65acfa8 000000fb00000000 00000209e8f6fcb8 00000209e8f6fc70
[248217.530654] Krnl Code: 00000289d49b07ea: af000000 mc 0,0
00000289d49b07ee: a7f4ff32 brc 15,00000289d49b0652
#00000289d49b07f2: af000000 mc 0,0
>00000289d49b07f6: bf13b678 icm %r1,3,1656(%r11)
00000289d49b07fa: a784ff43 brc 8,00000289d49b0680
00000289d49b07fe: af000000 mc 0,0
00000289d49b0802: a7f4ff3f brc 15,00000289d49b0680
00000289d49b0806: 0707 bcr 0,%r7
[248217.530794] Call Trace:
[248217.530798] [<00000289d49b07f6>] set_task_cpu+0x1e6/0x200
[248217.530803] ([<00000289d49d0f7e>] dequeue_task_dl+0x14e/0x1a0)
[248217.530806] [<00000289d49cc48c>] push_dl_task+0x1ac/0x220
[248217.530808] [<00000289d49cdba8>] dl_task_timer+0x178/0x1d0
[248217.530811] [<00000289d4a355ea>] __hrtimer_run_queues+0x17a/0x2e0
[248217.530814] [<00000289d4a36820>] hrtimer_interrupt+0x130/0x2a0
[248217.530817] [<00000289d49177f2>] do_IRQ+0x42/0x70
[248217.530820] [<00000289d491795a>] do_irq_async+0x5a/0x80
[248217.530823] [<00000289d5709dcc>] do_ext_irq+0xac/0x170
[248217.530827] [<00000289d5715e9a>] ext_int_handler+0xc2/0xe8
[248217.530830] [<00000289d4bc8380>] __rseq_handle_notify_resume+0x60/0x170
[248217.530834] [<00000289d491353c>] arch_do_signal_or_restart+0x1ac/0x320
[248217.530836] [<00000289d570a0d2>] syscall_exit_to_user_mode+0x122/0x230
[248217.530840] [<00000289d5709a9a>] __do_syscall+0x14a/0x250
[248217.530843] [<00000289d57157ce>] system_call+0x6e/0x90
[248217.530845] Last Breaking-Event-Address:
[248217.530846] [<00000289d49b0674>] set_task_cpu+0x64/0x200
[248217.530851] ---[ end trace 0000000000000000 ]---
[248217.902560] Fallback order for Node 0: 0
[248217.902563] Built 1 zonelists, mobility grouping on. Total pages: 279779194
[248217.902568] Policy zone: Normal
[248220.564502] fixpoint divide exception: 0009 ilc:2 [#1]SMP
[248220.564511] Modules linked in: algif_hash af_alg 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 mlx5_ib ib_uverbs ib_core mlx5_vdpa vdpa vringh vhost_iotlb ip_set nf_tables mlx5_core s390_trng vfio_ccw mdev eadm_sch vfio_iommu_type1 vfio sch_fq_codel drm i2c_core loop configfs drm_panel_orientation_quirks nfnetlink ctcm fsm zfcp scsi_transport_fc uvdevice diag288_wdt hmac_s390 ghash_s390 prng aes_s390 des_s390 libdes sha3_512_s390 sha3_256_s390 sha512_s390 sha256_s390 sha1_s390 sha_common paes_s390 crypto_engine pkey_cca pkey_ep11 zcrypt rng_core pkey_pckmo pkey autofs4 ecdsa_generic ecc
[248220.564558] CPU: 10 UID: 0 PID: 809915 Comm: stress-ng-cpu-s Tainted: G W 6.16.0-20250526.rc0.git4.b871b0f876d9.63.fc42.s390x #1 NONE
[248220.564562] Tainted: [W]=WARN
[248220.564563] Hardware name: IBM 9175 ME1 701 (LPAR)
[248220.564564] Krnl PSW : 0404e00180000000 00000289d49cb02a (task_non_contending+0x13a/0x340)
[248220.564569] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
[248220.564571] Krnl GPRS: 0000000000000001 0000000000000030 0000000000000000 00000000000001a1
[248220.564573] 00000000000001a0 0000000000006666 0000000000006666 00000289d670c1e0
[248220.564575] 00000289d5c92da8 00000289d62e7d38 000000fb00000000 000000e88736a630
[248220.564576] 000003ff97a2cfa8 0000020900000047 00000289d49cb022 00000209ec89fc50
[248220.564582] Krnl Code: 00000289d49cb01c: c0e5ffffeef2 brasl %r14,00000289d49c8e00
00000289d49cb022: b9140056 lgfr %r5,%r6
#00000289d49cb026: b90d0042 dsgr %r4,%r2
>00000289d49cb02a: e32070f80004 lg %r2,248(%r7)
00000289d49cb030: c4a800c80ab0 lgrl %r10,00000289d62cc590
00000289d49cb036: b9090026 sgr %r2,%r6
00000289d49cb03a: e32070f80024 stg %r2,248(%r7)
00000289d49cb040: c42800c81264 lgrl %r2,00000289d62cd508
[248220.564630] Call Trace:
[248220.564633] [<00000289d49cb02a>] task_non_contending+0x13a/0x340
[248220.564637] ([<00000289d49cb022>] task_non_contending+0x132/0x340)
[248220.564640] [<00000289d49cb35e>] switched_from_dl+0x12e/0x180
[248220.564643] [<00000289d49acf44>] check_class_changed+0x44/0xa0
[248220.564646] [<00000289d49d315e>] __sched_setscheduler+0x30e/0x990
[248220.564648] [<00000289d49d38dc>] sched_setscheduler+0x7c/0x90
[248220.564650] [<00000289d49d395a>] do_sched_setscheduler+0x6a/0x130
[248220.564652] [<00000289d49d3c2c>] __s390x_sys_sched_setscheduler+0x3c/0x60
[248220.564654] [<00000289d5709a86>] __do_syscall+0x136/0x250
[248220.564657] [<00000289d57157ce>] system_call+0x6e/0x90
[248220.564661] Last Breaking-Event-Address:
[248220.564661] [<00000289d49c8ea2>] dl_bw_cpus+0xa2/0xd0
[248220.564666] Kernel panic - not syncing: Fatal exception: panic_on_oops
Thanks,
Mikhail
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