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SubjectWARNING at switch_mm_irqs_off, followed by frozen machine
Date
Hi,

Yesterday my computer with kernel version 5.7.2 was frozen badly enough
that hard reset was necessary (did not react to SysRq keys). Upon
checking logs I found following warning and information from the time
just before resetting it.

Computer has AMD Ryzen 7 2700, Asus B450 motherboard.

5.8-rc1 encountered BUG() and did not boot (iommu and smp_processor_id()
called from wrong context, I'll see if I can catch log somehow).

kernel: [ 1166.739530] ------------[ cut here ]------------
kernel: [ 1166.739539] WARNING: CPU: 4 PID: 0 at
switch_mm_irqs_off+0x3ef/0x4a0
kernel: [ 1166.739540] Modules linked in: nf_tables(E) nfnetlink(E)
binfmt_misc(E) nls_ascii(E) nls_cp437(E) vfat(E) fat(E) snd_hda_cod
ec_realtek(E) snd_hda_codec_generic(E) ledtrig_audio(E)
snd_hda_codec_hdmi(E) snd_usb_audio(E) snd_hda_intel(E)
snd_intel_dspcfg(E) snd_usbmidi_lib(E) snd_hda_cod
ec(E) snd_rawmidi(E) snd_hda_core(E) snd_hwdep(E) snd_seq_device(E)
mc(E) snd_pcm_oss(E) amdgpu(E) snd_mixer_oss(E) gpu_sched(E) snd_pcm(E)
ttm(E) snd_timer(E) jo
ydev(E) drm_kms_helper(E) snd(E) cec(E) soundcore(E) eeepc_wmi(E)
asus_wmi(E) fb_sys_fops(E) syscopyarea(E) battery(E) edac_mce_amd(E)
sparse_keymap(E) sysfillrec
t(E) sysimgblt(E) i2c_algo_bit(E) kvm_amd(E) video(E) kvm(E)
irqbypass(E) 8250(E) ccp(E) wmi_bmof(E) sg(E) 8250_base(E) r8169(E)
serial_mctrl_gpio(E) rng_core(E)
crct10dif_pclmul(E) realtek(E) serial_core(E) crc32_pclmul(E) libphy(E)
ghash_clmulni_intel(E) aesni_intel(E) wmi(E) i2c_piix4(E) k10temp(E)
crypto_simd(E) cryptd
(E) efi_pstore(E) glue_helper(E) efivars(E) acpi_cpufreq(E) button(E)
kernel: [ 1166.739583]  nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E)
grace(E) parport_pc(E) drm(E) sunrpc(E) ppdev(E) lp(E) agpgart(E) pa
rport(E) efivarfs(E) ip_tables(E) x_tables(E) autofs4(E) raid10(E)
raid456(E) libcrc32c(E) async_raid6_recov(E) async_memcpy(E) async_pq(E)
async_xor(E) xor(E) async_tx(E) raid6_pq(E) raid1(E) raid0(E)
multipath(E) linear(E) md_mod(E) evdev(E) input_leds(E) hid_generic(E)
usbhid(E) hid(E) crc32c_intel(E) xhci_pci(E) xhci_hcd(E) sd_mod(E)
usbcore(E) t10_pi(E) gpio_amdpt(E) gpio_generic(E)
kernel: [ 1166.739613] CPU: 4 PID: 0 Comm: swapper/4 Tainted:
G            E     5.7.2 #2
kernel: [ 1166.739614] Hardware name: System manufacturer System Product
Name/TUF B450-PLUS GAMING, BIOS 2008 12/06/2019
kernel: [ 1166.739618] RIP: 0010:switch_mm_irqs_off+0x3ef/0x4a0
kernel: [ 1166.739621] Code: 00 00 0f 84 be fc ff ff b9 49 00 00 00 b8
01 00 00 00 31 d2 0f 30 48 8b 86 68 03 00 00 65 48 89 05 fe 9e fb 7e e9
9c fc ff ff <0f> 0b f0 4c 0f ab ad 00 04 00 00 e9 3b fe ff ff b9 49 00
00 00 b8
kernel: [ 1166.739623] RSP: 0018:ffffc90000147e48 EFLAGS: 00210086
kernel: [ 1166.739624] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000000
kernel: [ 1166.739626] RDX: ffff88871e43c001 RSI: ffff88871e43c0c0 RDI:
ffff8886fdede440
kernel: [ 1166.739627] RBP: ffff8886fdede440 R08: 0000000000000001 R09:
ffff8887f3b5d140
kernel: [ 1166.739628] R10: 000000000000025f R11: 0000000000000018 R12:
ffff8886fdede440
kernel: [ 1166.739629] R13: 0000000000000004 R14: ffff88871e43c0c0 R15:
0000000000000000
kernel: [ 1166.739631] FS:  0000000000000000(0000)
GS:ffff8887fe900000(0000) knlGS:0000000000000000
kernel: [ 1166.739632] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: [ 1166.739633] CR2: 00003d9b09447000 CR3: 000000071e4e0000 CR4:
00000000001406e0
kernel: [ 1166.739635] Call Trace:
kernel: [ 1166.739643]  __schedule+0x1cd/0x5e0
kernel: [ 1166.739647]  schedule_idle+0x28/0x40
kernel: [ 1166.739651]  do_idle+0x149/0x1f0
kernel: [ 1166.739655]  cpu_startup_entry+0x19/0x20
kernel: [ 1166.739659]  start_secondary+0x170/0x1c0
kernel: [ 1166.739663]  secondary_startup_64+0xa4/0xb0
kernel: [ 1166.739667] ---[ end trace 8c88a1b8567786da ]---

--

 - Ilkka Prusi


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