Hello. On sobota 17. července 2021 22:22:08 CEST Chris Clayton wrote: > I checked the output from dmesg yesterday and found the following warning: > > [Fri Jul 16 09:15:29 2021] ------------[ cut here ]------------ > [Fri Jul 16 09:15:29 2021] WARNING: CPU: 11 PID: 2701 at > kernel/rcu/tree_plugin.h:359 rcu_note_context_switch+0x37/0x3d0 [Fri Jul 16 > 09:15:29 2021] Modules linked in: uas hidp rfcomm bnep xt_MASQUERADE > iptable_nat nf_nat xt_LOG nf_log_syslog xt_limit xt_multiport xt_conntrack > iptable_filter btusb btintel wmi_bmof uvcvideo videobuf2_vmalloc > videobuf2_memops videobuf2_v4l2 videobuf2_common coretemp hwmon > snd_hda_codec_hdmi x86_pkg_temp_thermal snd_hda_codec_realtek > snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg > snd_hda_codec snd_hwdep snd_hda_core i2c_i801 i2c_smbus iwlmvm mac80211 > iwlwifi i915 mei_me mei cfg80211 intel_lpss_pci intel_lpss wmi > nf_conntrack_ftp xt_helper nf_conntrack nf_defrag_ipv4 tun > [Fri Jul 16 09:15:29 2021] CPU: 11 PID: 2701 Comm: lpqd Not tainted 5.13.2 > #1 [Fri Jul 16 09:15:29 2021] Hardware name: Notebook > NP50DE_DB /NP50DE_DB , BIOS 1.07.04 02/17/2020 > [Fri Jul 16 09:15:29 2021] RIP: 0010:rcu_note_context_switch+0x37/0x3d0 > [Fri Jul 16 09:15:29 2021] Code: 02 00 e8 ec a0 6c 00 89 c0 65 4c 8b 2c 25 > 00 6d 01 00 48 03 1c c5 80 56 e1 b6 40 84 ed 75 0d 41 8b 95 04 03 00 00 85 > d2 7e 02 <0f> 0b 65 48 8b 04 25 00 6d 01 00 8b 80 04 03 00 00 85 c0 7e 0a > 41 [Fri Jul 16 09:15:29 2021] RSP: 0000:ffffb5d483837c70 EFLAGS: 00010002 > [Fri Jul 16 09:15:29 2021] RAX: 000000000000000b RBX: ffff9b77806e1d80 RCX: > 0000000000000100 [Fri Jul 16 09:15:29 2021] RDX: 0000000000000001 RSI: > ffffffffb6d82ead RDI: ffffffffb6da5e4e [Fri Jul 16 09:15:29 2021] RBP: > 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [Fri Jul 16 > 09:15:29 2021] R10: 000000067bce4fff R11: 0000000000000000 R12: > ffff9b77806e1100 [Fri Jul 16 09:15:29 2021] R13: ffff9b734a833a00 R14: > ffff9b734a833a00 R15: 0000000000000000 [Fri Jul 16 09:15:29 2021] FS: > 00007fccbfc5fe40(0000) GS:ffff9b77806c0000(0000) knlGS:0000000000000000 > [Fri Jul 16 09:15:29 2021] CS: 0010 DS: 0000 ES: 0000 CR0: > 0000000080050033 [Fri Jul 16 09:15:29 2021] CR2: 00007fccc2db7290 CR3: > 00000003fb0b8002 CR4: 00000000007706e0 [Fri Jul 16 09:15:29 2021] PKRU: > 55555554 > [Fri Jul 16 09:15:29 2021] Call Trace: > [Fri Jul 16 09:15:29 2021] __schedule+0x86/0x810 > [Fri Jul 16 09:15:29 2021] schedule+0x40/0xe0 > [Fri Jul 16 09:15:29 2021] io_schedule+0x3d/0x60 > [Fri Jul 16 09:15:29 2021] wait_on_page_bit_common+0x129/0x390 > [Fri Jul 16 09:15:29 2021] ? __filemap_set_wb_err+0x10/0x10 > [Fri Jul 16 09:15:29 2021] __lock_page_or_retry+0x13f/0x1d0 > [Fri Jul 16 09:15:29 2021] do_swap_page+0x335/0x5b0 > [Fri Jul 16 09:15:29 2021] __handle_mm_fault+0x444/0xb20 > [Fri Jul 16 09:15:29 2021] handle_mm_fault+0x5c/0x170 > [Fri Jul 16 09:15:29 2021] ? find_vma+0x5b/0x70 > [Fri Jul 16 09:15:29 2021] exc_page_fault+0x1ab/0x610 > [Fri Jul 16 09:15:29 2021] ? fpregs_assert_state_consistent+0x19/0x40 > [Fri Jul 16 09:15:29 2021] ? asm_exc_page_fault+0x8/0x30 > [Fri Jul 16 09:15:29 2021] asm_exc_page_fault+0x1e/0x30 > [Fri Jul 16 09:15:29 2021] RIP: 0033:0x7fccc2d3c520 > [Fri Jul 16 09:15:29 2021] Code: 68 4c 00 00 00 e9 20 fb ff ff ff 25 7a ad > 07 00 68 4d 00 00 00 e9 10 fb ff ff ff 25 72 ad 07 00 68 4e 00 00 00 e9 00 > fb ff ff <ff> 25 6a ad 07 00 68 4f 00 00 00 e9 f0 fa ff ff ff 25 62 ad 07 > 00 [Fri Jul 16 09:15:29 2021] RSP: 002b:00007ffebd529048 EFLAGS: 00010293 > [Fri Jul 16 09:15:29 2021] RAX: 0000000000000001 RBX: 00007fccc46e2890 RCX: > 0000000000000010 [Fri Jul 16 09:15:29 2021] RDX: 0000000000000010 RSI: > 0000000000000000 RDI: 00007fccc46e2890 [Fri Jul 16 09:15:29 2021] RBP: > 000056264f1dd4a0 R08: 000056264f21aba0 R09: 000056264f1f58a0 [Fri Jul 16 > 09:15:29 2021] R10: 0000000000000007 R11: 0000000000000246 R12: > 000056264f21ac00 [Fri Jul 16 09:15:29 2021] R13: 000056264f1e0a30 R14: > 00007ffebd529080 R15: 00000000000dd87b [Fri Jul 16 09:15:29 2021] ---[ end > trace c8b06e067d8b0fc2 ]--- > > At the time the warning was issued I was creating a (weekly) backup of my > linux system (home-brewed based on the guidance from Linux From Scratch). > My backup routine is completed by copying the archive files (created with > dar) and a directory that contains about 7000 source and binary rpm files > to an external USB drive. I didn't spot the warning until later in the day, > so I'm not sure exactly where I was in my backup process. > > I haven't seen this warning before. Consequently, I don;t know how easy (or > otherwise) it is to reproduce. > > Let me know if I can provide any additional diagnostics, but please cc me as > I'm not subscribed. Confirming the same for me with v5.13.2, and cross-referencing another report [1] against v5.12.17. Also Cc'ing relevant people on this. Thanks. [1] https://lore.kernel.org/lkml/CAK2bqVK0Q9YcpakE7_Rc6nr-E4e2GnMOgi5jJj=_Eh_1kEHLHA@xxxxxxxxxxxxxx/ -- Oleksandr Natalenko (post-factum)
