Re: WARN with 5.12.17

[Oleksandr Natalenko]

Hello.

On sobota 17. července 2021 13:28:53 CEST Chris Rankin wrote:
> I have noticed this WARNING when running 5.12.17. Rebuilding the
> entire kernel after a "make clean" has not helped.
> 
> Cheers,
> Chris
> 
> [  138.553764] ------------[ cut here ]------------
> [  138.553776] WARNING: CPU: 0 PID: 2311 at
> kernel/rcu/tree_plugin.h:297 rcu_note_context_switch+0x2f/0x2b1
> [  138.553799] Modules linked in: uinput hdaps ip6t_REJECT
> nf_reject_ipv6 ip6table_filter ip6_tables xt_state xt_conntrack
> nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c xt_tcpudp
> ipt_REJECT nf_reject_ipv4 iptable_filter sunrpc coretemp ppdev
> kvm_intel kvm irqbypass snd_seq_dummy snd_seq_oss snd_emu10k1_synth
> snd_emux_synth iwl3945 joydev evdev snd_seq_midi_emul i2c_i801
> snd_seq_virmidi iwlegacy pcspkr i2c_smbus snd_seq_midi
> snd_seq_midi_event mac80211 cfg80211 snd_hda_codec_hdmi
> snd_hda_codec_analog snd_hda_codec_generic snd_emu10k1 snd_hda_intel
> snd_intel_dspcfg snd_util_mem libarc4 snd_hda_codec snd_ac97_codec
> ac97_bus snd_rawmidi snd_hda_core thinkpad_acpi snd_seq snd_hwdep
> snd_seq_device snd_pcm nvram ledtrig_audio snd_hrtimer
> platform_profile snd_timer rfkill tiny_power_button parport_pc ac
> battery snd parport video acpi_cpufreq soundcore button sch_fq_codel
> binfmt_misc fuse ip_tables x_tables usbhid ext4 crc32c_generic crc16
> mbcache jbd2 usb_storage sd_mod sr_mod cdrom
> [  138.554028]  pata_acpi radeon i2c_algo_bit drm_ttm_helper ttm
> pcmcia drm_kms_helper ata_piix ahci libahci syscopyarea sysfillrect
> sysimgblt fb_sys_fops cec libata rc_core drm serio_raw scsi_mod
> uhci_hcd e1000e yenta_socket pcmcia_rsrc pcmcia_core ptp ehci_pci
> ehci_hcd drm_panel_orientation_quirks pps_core 8250 8250_base
> serial_mctrl_gpio serial_core msr sha256_generic sha1_generic ipv6
> crc_ccitt
> [  138.554135] CPU: 0 PID: 2311 Comm: gdbus Not tainted 5.12.17 #2
> [  138.554143] Hardware name: LENOVO 8742C4G/8742C4G, BIOS 7IET38WW
> (1.19 ) 03/22/2011
> [  138.554149] RIP: 0010:rcu_note_context_switch+0x2f/0x2b1
> [  138.554160] Code: 2c 25 00 6d 01 00 41 54 49 c7 c4 80 24 02 00 55
> 53 89 fb 65 4c 03 25 fe d1 f7 7e 40 84 ff 75 0c 41 83 bd 1c 03 00 00
> 00 7e 02 <0f> 0b 65 48 8b 04 25 00 6d 01 00 83 b8 1c 03 00 00 00 0f 8e
> 28 02
> [  138.554167] RSP: 0000:ffffc900028efc80 EFLAGS: 00010002
> [  138.554176] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
> 0000000000000102 [  138.554181] RDX: 0000000081c09214 RSI: ffffea0000fa65c0
> RDI: 0000000000000000 [  138.554188] RBP: ffffc900028efce0 R08:
> 0000000000000000 R09: ffffea0000fa65c0 [  138.554194] R10: ffffc900028efc68
> R11: 0000000000000003 R12: ffff88807dc22480 [  138.554199] R13:
> ffff888056416a00 R14: 0000000000000000 R15: 0000000000000000 [  138.554205]
> FS:  00007f94411ab640(0000) GS:ffff88807dc00000(0000)
> knlGS:0000000000000000
> [  138.554213] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  138.554219] CR2: 00007f9453ea6f78 CR3: 000000005489e000 CR4:
> 00000000000006f0 [  138.554225] Call Trace:
> [  138.554236]  __schedule+0x5e/0x4df
> [  138.554250]  schedule+0x88/0xb5
> [  138.554258]  io_schedule+0xd/0x2f
> [  138.554266]  wait_on_page_bit_common+0x1b6/0x249
> [  138.554277]  ? filemap_get_read_batch+0x133/0x133
> [  138.554286]  __lock_page_or_retry+0x38/0x79
> [  138.554295]  do_swap_page+0x230/0x4c4
> [  138.554306]  __handle_mm_fault+0x40b/0xa30
> [  138.554317]  handle_mm_fault+0x11e/0x1ea
> [  138.554327]  exc_page_fault+0x2bd/0x4cc
> [  138.554335]  ? asm_exc_page_fault+0x8/0x30
> [  138.554344]  asm_exc_page_fault+0x1e/0x30
> [  138.554351] RIP: 0033:0x7f9452a9ea17
> [  138.554359] Code: 89 c2 48 3d 00 f0 ff ff 77 d0 48 83 c4 08 5d 41
> 5c c3 90 f3 0f 1e fa 41 54 49 89 f4 55 89 fd 48 83 ec 08 48 8b 05 29
> b4 0f 00 <48> 8b 80 b8 02 00 00 48 85 c0 74 2d ff d0 48 63 d0 48 81 fa
> 00 f0
> [  138.554367] RSP: 002b:00007f94411aa970 EFLAGS: 00010202
> [  138.554374] RAX: 00007f9453ea6cc0 RBX: 0000000000000000 RCX:
> 00007f94411aa9c0 [  138.554380] RDX: 00007f94411aa9c8 RSI: 00007f94411aa9d0
> RDI: 0000000000000001 [  138.554386] RBP: 0000000000000001 R08:
> 00007f94411aa9d0 R09: 0000000000000002 [  138.554392] R10: 0000000000000020
> R11: 0000000000000293 R12: 00007f94411aa9d0 [  138.554397] R13:
> 00007f9453c18b60 R14: 00007f9434001410 R15: 000055b519b81690 [  138.554407]
> ---[ end trace 16c264fd475c3beb ]---

There's another report against v5.13.2 [2], I've Cc'ed you there. Let's 
discuss this matter in that thread.

Thanks.

-- 
Oleksandr Natalenko (post-factum)