Linux 6.7-rc1+: WARNING at drivers/xen/evtchn.c:167 evtchn_interrupt

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

While testing 6.7-rc3 on Qubes OS I found several warning like in the
subject in dom0 log. I see them when running 6.7-rc1 too. I'm not sure
what exactly triggers the issue, but my guess would be unbinding an
event channel from userspace (closing vchan connection).

Specific message:

[   83.973377] ------------[ cut here ]------------
[   83.975523] Interrupt for port 77, but apparently not enabled; per-user 
00000000a0e9f1d1
[   83.979083] WARNING: CPU: 1 PID: 2432 at drivers/xen/evtchn.c:167 
evtchn_interrupt+0xb6/0xc0 [xen_evtchn]
[   83.982869] Modules linked in: joydev intel_rapl_msr intel_rapl_common 
snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg 
snd_intel_sdw_acpi ppdev snd_hda_codec snd_hda_core snd_hwdep snd_seq 
snd_seq_device snd_pcm parport_pc parport pcspkr snd_timer snd e1000e i2c_piix4 
soundcore fuse loop xenfs dm_thin_pool dm_persistent_data dm_bio_prison 
crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic 
ghash_clmulni_intel sha512_ssse3 sha256_ssse3 sha1_ssse3 virtio_scsi bochs 
serio_raw drm_vram_helper xhci_pci xhci_pci_renesas floppy drm_ttm_helper 
xhci_hcd ttm ata_generic pata_acpi qemu_fw_cfg virtio_console xen_privcmd 
xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn scsi_dh_rdac 
scsi_dh_emc scsi_dh_alua uinput dm_multipath
[   84.019753] CPU: 1 PID: 2432 Comm: qrexec-client Not tainted 
6.7.0-0.rc3.1.qubes.1.fc37.x86_64 #1
[   84.027045] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
[   84.033828] RIP: e030:evtchn_interrupt+0xb6/0xc0 [xen_evtchn]
[   84.037814] Code: ba 01 00 00 00 be 1d 00 00 00 48 8d bb 88 00 00 00 e8 ce 
93 27 c1 eb b4 8b 76 20 48 89 da 48 c7 c7 70 52 21 c0 e8 0a 5c f0 c0 <0f> 0b e9 
61 ff ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90
[   84.048932] RSP: e02b:ffffc90041e7fd60 EFLAGS: 00010082
[   84.051252] RAX: 0000000000000000 RBX: ffff888104fc9a80 RCX: 0000000000000027
[   84.054569] RDX: ffff88813ff21608 RSI: 0000000000000001 RDI: ffff88813ff21600
[   84.057606] RBP: ffff88810522a280 R08: 0000000000000000 R09: ffffc90041e7fbf8
[   84.060864] R10: 0000000000000003 R11: ffffffff82f460c8 R12: ffff888105d5b6a4
[   84.064043] R13: ffff888105d5b760 R14: ffff88810522a280 R15: ffff888105d5b600
[   84.066598] FS:  000075ee3eb8ed40(0000) GS:ffff88813ff00000(0000) 
knlGS:0000000000000000
[   84.069251] CS:  10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
[   84.071293] CR2: 00007b86fa0f0f5c CR3: 0000000106e18000 CR4: 0000000000040660
[   84.073911] Call Trace:
[   84.074746]  <TASK>
[   84.075471]  ? evtchn_interrupt+0xb6/0xc0 [xen_evtchn]
[   84.077448]  ? __warn+0x81/0x130
[   84.078671]  ? evtchn_interrupt+0xb6/0xc0 [xen_evtchn]
[   84.080507]  ? report_bug+0x171/0x1a0
[   84.081830]  ? prb_read_valid+0x1b/0x30
[   84.083682]  ? handle_bug+0x41/0x70
[   84.084952]  ? exc_invalid_op+0x17/0x70
[   84.086314]  ? asm_exc_invalid_op+0x1a/0x20
[   84.088520]  ? evtchn_interrupt+0xb6/0xc0 [xen_evtchn]
[   84.090300]  __free_irq+0x114/0x2b0
[   84.091478]  free_irq+0x32/0x70
[   84.092522]  unbind_from_irqhandler+0x31/0xb0
[   84.094035]  evtchn_release+0x2b/0xa0 [xen_evtchn]
[   84.095643]  __fput+0x9a/0x2c0
[   84.096734]  __x64_sys_close+0x3d/0x80
[   84.097995]  do_syscall_64+0x63/0xe0
[   84.099188]  ? __vm_munmap+0xbb/0x150
[   84.100431]  ? syscall_exit_work+0x103/0x130
[   84.101854]  ? syscall_exit_to_user_mode+0x2b/0x40
[   84.103509]  ? do_syscall_64+0x6f/0xe0
[   84.104757]  ? syscall_exit_to_user_mode+0x2b/0x40
[   84.106350]  ? do_syscall_64+0x6f/0xe0
[   84.107587]  ? exit_to_user_mode_prepare+0xbc/0xd0
[   84.109180]  entry_SYSCALL_64_after_hwframe+0x6e/0x76
[   84.110863] RIP: 0033:0x75ee3ed15a0a
[   84.111999] Code: 00 00 0f 05 48 3d 00 f0 ff ff 77 44 c3 0f 1f 00 48 83 ec 
18 89 7c 24 0c e8 33 bc f8 ff 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 
f0 ff ff 77 36 89 d7 89 44 24 0c e8 93 bc f8 ff 8b 44 24
[   84.118267] RSP: 002b:00007ffff0ad0f70 EFLAGS: 00000293 ORIG_RAX: 
0000000000000003
[   84.120756] RAX: ffffffffffffffda RBX: 000055d3d8f70970 RCX: 000075ee3ed15a0a
[   84.123675] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000f
[   84.126012] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   84.128366] R10: 000075ee3ec31468 R11: 0000000000000293 R12: 0000000000000000
[   84.130699] R13: 0000000000000000 R14: 00007ffff0ad2eaa R15: 000055d3d8f6f2a0
[   84.133050]  </TASK>
[   84.133810] ---[ end trace 0000000000000000 ]---

Full log: https://openqa.qubes-os.org/tests/86647/logfile?filename=serial0.txt

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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