Date:   Fri, 16 Jun 2023 01:25:33 -0400
From:   Hamza Mahfooz <someguy@...ective-light.com>
To:     kvm@...r.kernel.org
Cc:     regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: KVM page-fault on Kernel 6.3.8

I am seeing the following page-fault on the latest stable kernel:

BUG: unable to handle page fault for address: ffffb4ff0cd20034
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 10002a067 P4D 10002a067 PUD 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 7 PID: 2675 Comm: CPU 7/KVM Not tainted 6.3.8-arch1-1 #1 
a1d299e746aebdb27c523dd3bd94aba6f54915c7
Hardware name: ASUS System Product Name/ProArt X670E-CREATOR WIFI, BIOS 
1303 04/27/2023
RIP: 0010:try_grab_folio+0x14f/0x370
Code: 83 f8 04 75 6f 44 89 ee 4c 89 e7 e8 6b bc 0b 00 84 c0 74 60 4c 8b 
63 08 41 f6 c4 01 0f 85 b0 01 00 00 0f 1f 44 00 00 49 89 dc <41> 8b 44 
24 34 85 c0 0f 88 f8 00 00 00 41 8b 44 24 34 85 c0 74 58
RSP: 0018:ffff9fa98504b948 EFLAGS: 00010086
RAX: 0000000000000002 RBX: fffff4ff0cd21480 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000001 RDI: fffff4ff0cd21480
RBP: 0000000000000000 R08: ffff8b2edb510980 R09: 00007f5624253000
R10: 80000003348008e7 R11: 00007f5624253000 R12: ffffb4ff0cd20000
R13: 0000000000000001 R14: 0000000000000003 R15: 0000000000000001
FS: 00007f548a7fc6c0(0000) GS:ffff8b35f83c0000(0000) 
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffb4ff0cd20034 CR3: 0000000113e70000 CR4: 0000000000750ee0
PKRU: 55555554
Call Trace:
 <TASK>
 ? __die+0x23/0x70
 ? page_fault_oops+0x171/0x4e0
 ? exc_page_fault+0x172/0x180
 ? asm_exc_page_fault+0x26/0x30
 ? try_grab_folio+0x14f/0x370
 internal_get_user_pages_fast+0x883/0x1150
 __iov_iter_get_pages_alloc+0xdd/0x780
 ? kmem_cache_alloc+0x16f/0x330
 ? bio_associate_blkg_from_css+0xcd/0x340
 iov_iter_get_pages+0x1d/0x40
 bio_iov_iter_get_pages+0xa1/0x480
 __blkdev_direct_IO_async+0xc5/0x1b0
 blkdev_read_iter+0x127/0x1d0
 aio_read+0x132/0x210
 ? io_submit_one+0x46a/0x8b0
 io_submit_one+0x46a/0x8b0
 ? kvm_arch_vcpu_put+0x128/0x190 [kvm 
711ceda1c40511ce22d1f99f4e9e574def76b25e]
 ? kvm_arch_vcpu_ioctl_run+0x579/0x1770 [kvm 
711ceda1c40511ce22d1f99f4e9e574def76b25e]
 __x64_sys_io_submit+0xad/0x190
 do_syscall_64+0x5d/0x90
 ? __x64_sys_ioctl+0xac/0xd0
 ? syscall_exit_to_user_mode+0x1b/0x40
 ? do_syscall_64+0x6c/0x90
 ? syscall_exit_to_user_mode+0x1b/0x40
 ? do_syscall_64+0x6c/0x90
 ? syscall_exit_to_user_mode+0x1b/0x40
 ? do_syscall_64+0x6c/0x90
 ? syscall_exit_to_user_mode+0x1b/0x40
 ? do_syscall_64+0x6c/0x90
 ? do_syscall_64+0x6c/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f57ac0912ed
Code: 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 
f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 
f0 ff ff 73 01 c3 48 8b 0d 3b 7a 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007f5427ab97b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f548a7fc1d0 RCX: 00007f57ac0912ed
RDX: 00007f5427ab9800 RSI: 0000000000000001 RDI: 00007f57a9d24000
RBP: 00007f57a9d24000 R08: 0000000000000001 R09: 0000000000000001
R10: 00007f54740044f0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000004 R14: 00007f5427ab9800 R15: 000000000000000e
 </TASK>
Modules linked in: hid_playstation led_class_multicolor ff_memless tun 
snd_seq_dummy snd_hrtimer snd_seq xt_CHECKSUM xt_MASQUERADE 
xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp nft_compat 
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 
nf_tables libcrc32c nfnetlink bridge stp llc vfat fat 
snd_hda_codec_realtek snd_hda_codec_generic mt7921e snd_hda_codec_hdmi 
mt7921_common snd_usb_audio intel_rapl_msr mt76_connac_lib 
snd_hda_intel intel_rapl_common snd_intel_dspcfg mt76 snd_usbmidi_lib 
btusb snd_intel_sdw_acpi edac_mce_amd snd_rawmidi btrtl snd_hda_codec 
btbcm snd_seq_device btintel snd_hda_core kvm_amd mc snd_hwdep 
eeepc_wmi btmtk snd_pcm asus_wmi kvm mac80211 bluetooth ledtrig_audio 
atlantic snd_timer i8042 sparse_keymap libarc4 ecdh_generic rapl 
platform_profile serio intel_wmi_thunderbolt i2c_piix4 wmi_bmof pcspkr 
k10temp thunderbolt snd igc ucsi_acpi macsec soundcore cfg80211 
typec_ucsi mousedev joydev typec roles rfkill gpio_amdpt acpi_cpufreq 
gpio_generic mac_hid dm_multipath
 crypto_user fuse loop bpf_preload ip_tables x_tables ext4 
crc32c_generic crc16 mbcache jbd2 dm_crypt cbc encrypted_keys trusted 
asn1_encoder tee dm_mod hid_logitech_hidpp hid_logitech_dj usbhid 
amdgpu crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni 
polyval_generic i2c_algo_bit drm_ttm_helper gf128mul nvme 
ghash_clmulni_intel ttm sha512_ssse3 drm_buddy aesni_intel gpu_sched 
crypto_simd nvme_core drm_display_helper cryptd ccp xhci_pci cec 
nvme_common xhci_pci_renesas video wmi vfio_pci vfio_pci_core irqbypass 
vfio_iommu_type1 vfio iommufd
CR2: ffffb4ff0cd20034
---[ end trace 0000000000000000 ]---
RIP: 0010:try_grab_folio+0x14f/0x370
Code: 83 f8 04 75 6f 44 89 ee 4c 89 e7 e8 6b bc 0b 00 84 c0 74 60 4c 8b 
63 08 41 f6 c4 01 0f 85 b0 01 00 00 0f 1f 44 00 00 49 89 dc <41> 8b 44 
24 34 85 c0 0f 88 f8 00 00 00 41 8b 44 24 34 85 c0 74 58
RSP: 0018:ffff9fa98504b948 EFLAGS: 00010086
RAX: 0000000000000002 RBX: fffff4ff0cd21480 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000001 RDI: fffff4ff0cd21480
RBP: 0000000000000000 R08: ffff8b2edb510980 R09: 00007f5624253000
R10: 80000003348008e7 R11: 00007f5624253000 R12: ffffb4ff0cd20000
R13: 0000000000000001 R14: 0000000000000003 R15: 0000000000000001
FS: 00007f548a7fc6c0(0000) GS:ffff8b35f83c0000(0000) 
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffb4ff0cd20034 CR3: 0000000113e70000 CR4: 0000000000750ee0
PKRU: 55555554
note: CPU 7/KVM[2675] exited with irqs disabled

It seems to appear randomly, so bisecting it would probably be
difficult. Also, as far as I can tell it seems to be a recent
regression (i.e. it was introduced in one of the 6.3.y releases).

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