Message-ID: <larwoziyxystxbkavav2fuainmhydann7sujeieqvbck4s6zxt@hlx23jjuontu>
Date: Mon, 15 Jul 2024 08:05:58 +0000
From: Daniel Gomez <da.gomez@...sung.com>
To: Zorro Lang <zlang@...hat.com>
CC: "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"fstests@...r.kernel.org" <fstests@...r.kernel.org>, "Darrick J. Wong"
	<djwong@...nel.org>
Subject: Re: [Bug report]: fstests g/388 crash on ext4, BUG: kernel NULL
 pointer dereference, address: 0000000000000000

On Sun, Jul 14, 2024 at 11:46:24AM GMT, Zorro Lang wrote:
> Hi,
> 
> A weird kernel panic on ext4 happened when I tried to test a
> fstests patchset:
> https://lore.kernel.org/fstests/20240712093341.ftesijixy2yrjlxx@dell-per750-06-vm-08.rhts.eng.pek2.redhat.com/T/#med4b8d2fe14ef627519d84474b4cd1a25d386f75
> 
> its 4nd one:
> https://lore.kernel.org/fstests/20240712093341.ftesijixy2yrjlxx@dell-per750-06-vm-08.rhts.eng.pek2.redhat.com/T/#m5627037d617e9bc41b12bb7cc3f54fe4fb238dc6
> brings in lots of test failures, that might be a test bug.
> 
> But besides that, an ext4 kernel panic was triggered with this
> patchset (I can't reproduce it without this patchset). Looks like
> an error was triggered by another error, so I decided to report out.
> 
> With this patchset, the generic/388 rarely(~1%) hit below panic[1], the
> .full output as [0]. I'm not sure if it's a hidden ext4 bug, so send
> to ext4 list to get a review.

Thanks Zorro for testing the patch set and for the report.

As I mentioned to Ted earlier, my assumption is that we are now including
the default ext* mount options for the scratch device, which we hadn't done
previously. Can you confirm if removing them 'fixes' the test?

> 
> Thanks,
> Zorro
> 
> 
> [0]
> Creating filesystem with 3932160 4k blocks and 983040 inodes
> Filesystem UUID: b9690547-c193-4a82-b0df-4682bd621d3f
> Superblock backups stored on blocks: 
> 	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
> 
> Allocating group tables:   0/120␈␈␈␈␈␈␈       ␈␈␈␈␈␈␈done                            
> Writing inode tables:   0/120␈␈␈␈␈␈␈       ␈␈␈␈␈␈␈done                            
> Creating journal (16384 blocks): done
> Writing superblocks and filesystem accounting information:   0/120␈␈␈␈␈␈␈       ␈␈␈␈␈␈␈done
> 
> seed = 1721442161
> seed = 1721536124
> seed = 1721158986
> seed = 1720946557
> seed = 1721227174
> seed = 1721752477
> seed = 1721267087
> seed = 1721329675
> seed = 1721263635
> seed = 1721309164
> seed = 1721144436
> seed = 1721492144
> seed = 1721512519
> seed = 1720725632
> cycle mount failed
> 
> [1]
> [35310.777927] run fstests generic/388 at 2024-07-13 21:12:06
> [35312.098738] EXT4-fs (sda2): mounted filesystem 6fedaf97-5fe1-4d3d-868d-5ad4900db404 r/w with ordered data mode. Quota mode: none.
> [35312.124292] EXT4-fs (sda2): shut down requested (1)
> [35312.129211] Aborting journal on device sda2-8.
> [35312.147925] EXT4-fs (sda2): unmounting filesystem 6fedaf97-5fe1-4d3d-868d-5ad4900db404.
> [35312.486599] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35312.524885] EXT4-fs (sda2): shut down requested (2)
> [35312.529803] Aborting journal on device sda2-8.
> [35313.280289] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35313.353971] EXT4-fs (sda2): recovery complete
> [35313.359705] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35315.399337] EXT4-fs (sda2): shut down requested (2)
> [35315.404250] Aborting journal on device sda2-8.
> [35316.683330] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35316.764573] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35316.771480] EXT4-fs (sda2): write access will be enabled during recovery
> [35317.049655] EXT4-fs (sda2): recovery complete
> [35317.055129] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35317.080533] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35317.165130] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35319.203680] EXT4-fs (sda2): shut down requested (2)
> [35319.208606] Aborting journal on device sda2-8.
> [35320.521093] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35320.603849] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35320.611211] EXT4-fs (sda2): write access will be enabled during recovery
> [35320.993602] EXT4-fs (sda2): recovery complete
> [35320.999013] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35321.025053] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35321.119319] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35323.157897] EXT4-fs (sda2): shut down requested (2)
> [35323.162810] Aborting journal on device sda2-8.
> [35324.496257] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35324.575773] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35324.582695] EXT4-fs (sda2): write access will be enabled during recovery
> [35324.717245] EXT4-fs (sda2): recovery complete
> [35324.723102] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35324.748295] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35324.817159] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35324.855518] EXT4-fs (sda2): shut down requested (2)
> [35324.860423] Aborting journal on device sda2-8.
> [35324.867025] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=393645
> [35324.867280] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=786642
> [35324.868330] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=131526
> [35324.868593] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=131938
> [35324.878133] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=394150
> [35324.883455] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=786642
> [35324.916255] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=786642
> [35325.610405] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35325.662638] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35325.669550] EXT4-fs (sda2): write access will be enabled during recovery
> [35325.687756] EXT4-fs (sda2): recovery complete
> [35325.694064] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35325.719752] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35325.770603] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35326.809758] EXT4-fs (sda2): shut down requested (2)
> [35326.814670] Aborting journal on device sda2-8.
> [35327.823794] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35328.283170] EXT4-fs (sda2): 1 orphan inode deleted
> [35328.288002] EXT4-fs (sda2): recovery complete
> [35328.294197] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35329.333283] EXT4-fs (sda2): shut down requested (2)
> [35329.338200] Aborting journal on device sda2-8.
> [35330.341614] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35330.912577] EXT4-fs (sda2): 1 truncate cleaned up
> [35330.917347] EXT4-fs (sda2): recovery complete
> [35330.923052] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35331.962748] EXT4-fs (sda2): shut down requested (2)
> [35331.967667] Aborting journal on device sda2-8.
> [35333.031590] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35333.147943] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35333.154863] EXT4-fs (sda2): write access will be enabled during recovery
> [35333.577648] EXT4-fs (sda2): recovery complete
> [35333.583083] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35333.611173] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35333.706016] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35333.803908] EXT4-fs warning (device sda2): ext4_convert_unwritten_extents_endio:3720: Inode (132935) finished: extent logical block 733, len 66; IO logical block 758, len 26
> [35335.746179] EXT4-fs (sda2): shut down requested (2)
> [35335.751095] Aborting journal on device sda2-8.
> [35337.014618] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35337.098961] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35337.106293] EXT4-fs (sda2): write access will be enabled during recovery
> [35337.361488] EXT4-fs (sda2): recovery complete
> [35337.366906] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35337.392378] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35337.472254] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35338.512258] EXT4-fs (sda2): shut down requested (2)
> [35338.517251] Aborting journal on device sda2-8.
> [35339.596659] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35339.660376] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35339.667282] EXT4-fs (sda2): write access will be enabled during recovery
> [35340.055893] EXT4-fs (sda2): recovery complete
> [35340.061309] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35340.086643] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35340.180932] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35341.220716] EXT4-fs (sda2): shut down requested (2)
> [35341.225633] Aborting journal on device sda2-8.
> [35342.243570] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35342.672960] EXT4-fs (sda2): recovery complete
> [35342.678447] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35343.300000] EXT4-fs warning (device sda2): ext4_convert_unwritten_extents_endio:3720: Inode (133749) finished: extent logical block 144, len 101; IO logical block 175, len 31
> [35343.717912] EXT4-fs (sda2): shut down requested (2)
> [35343.722824] Aborting journal on device sda2-8.
> [35344.767987] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35344.876771] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
> [35344.883673] EXT4-fs (sda2): write access will be enabled during recovery
> [35345.260916] EXT4-fs (sda2): recovery complete
> [35345.266320] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 ro with ordered data mode. Quota mode: none.
> [35345.291510] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35345.383234] EXT4-fs (sda2): mounted filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2 r/w with ordered data mode. Quota mode: none.
> [35345.422241] EXT4-fs (sda2): shut down requested (2)
> [35345.427163] Aborting journal on device sda2-8.
> [35345.431675] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=394420
> [35345.431678] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=264308
> [35345.433372] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=789092
> [35345.434998] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=263942
> [35345.435030] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=263942
> [35345.435048] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=263942
> [35345.436064] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=133331
> [35345.436251] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=264675
> [35345.437159] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=264710
> [35345.437251] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=133579
> [35345.437281] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=133579
> [35345.437301] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=133579
> [35345.438368] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=263983
> [35345.439129] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=263949
> [35345.439894] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=131950
> [35345.441211] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=264682
> [35345.442818] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=132288
> [35345.443412] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=132494
> [35345.443556] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=132490
> [35345.444855] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=395376
> [35345.446132] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=132705
> [35345.446580] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=395370
> [35345.449679] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=394044
> [35345.450739] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=788856
> [35345.450766] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=788856
> [35345.452532] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=786827
> [35345.454651] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=788873
> [35345.655294] SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=sda2 ino=395839
> [35346.176336] EXT4-fs (sda2): unmounting filesystem 23005ea9-4b8d-4f4d-a3d8-9eb88399cde2.
> [35346.243173] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [35346.250140] #PF: supervisor instruction fetch in kernel mode
> [35346.255799] #PF: error_code(0x0010) - not-present page
> [35346.260938] PGD 1140f35067 P4D 0 
> [35346.264267] Oops: Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI
> [35346.269665] CPU: 11 PID: 379238 Comm: mount Kdump: loaded Not tainted 6.10.0-rc7+ #1
> [35346.277405] Hardware name: Dell Inc. PowerEdge R750/0PJ80M, BIOS 1.5.4 12/17/2021
> [35346.284883] RIP: 0010:0x0
> [35346.287512] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
> [35346.294035] RSP: 0018:ffa000002e0ef6c8 EFLAGS: 00010246
> [35346.299260] RAX: 0000000000000000 RBX: ff110015601db830 RCX: ffffffff81fa6fea
> [35346.306393] RDX: 1ffffffff0888c6f RSI: ffd400004f2556c0 RDI: ff110015601dba70
> [35346.313527] RBP: ffd400004f2556c0 R08: 0000000000000000 R09: fffa7c0009e4aad8
> [35346.320661] R10: ffd400004f2556c7 R11: 0000000000000000 R12: 0000000000000060
> [35346.327792] R13: ff11001323c64a50 R14: 0000000000000000 R15: 0000000000000000
> [35346.334925] FS:  00007fd5de6e6800(0000) GS:ff11002032400000(0000) knlGS:0000000000000000
> [35346.343011] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [35346.348758] CR2: ffffffffffffffd6 CR3: 0000001320da6001 CR4: 0000000000771ef0
> [35346.355890] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [35346.363023] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [35346.370156] PKRU: 55555554
> [35346.372867] Call Trace:
> [35346.375319]  <TASK>
> [35346.377426]  ? __die+0x20/0x70
> [35346.380493]  ? page_fault_oops+0x116/0x230
> [35346.384602]  ? __pfx_page_fault_oops+0x10/0x10
> [35346.389048]  ? _raw_spin_unlock+0x29/0x50
> [35346.393072]  ? rcu_is_watching+0x11/0xb0
> [35346.397006]  ? exc_page_fault+0x59/0xe0
> [35346.400854]  ? asm_exc_page_fault+0x22/0x30
> [35346.405049]  ? folio_mark_dirty+0x2a/0xf0
> [35346.409072]  __ext4_block_zero_page_range+0x50c/0x7b0 [ext4]
> [35346.414809]  ext4_truncate+0xcd3/0x1210 [ext4]
> [35346.419312]  ? ext4_process_orphan+0xe3/0x3a0 [ext4]
> [35346.424349]  ? __pfx_ext4_truncate+0x10/0x10 [ext4]
> [35346.429288]  ? __pfx_down_write+0x10/0x10
> [35346.433301]  ? ext4_inode_is_fast_symlink+0x125/0x2f0 [ext4]
> [35346.439021]  ext4_process_orphan+0x132/0x3a0 [ext4]
> [35346.443961]  ext4_orphan_cleanup+0x611/0xeb0 [ext4]
> [35346.448904]  ? __pfx_ext4_orphan_cleanup+0x10/0x10 [ext4]
> [35346.454359]  ? is_module_address+0x34/0x70
> [35346.458464]  __ext4_fill_super+0x2824/0x46e0 [ext4]
> [35346.463412]  ? __pfx___ext4_fill_super+0x10/0x10 [ext4]
> [35346.468695]  ? __kmalloc_large_node+0x10c/0x1c0
> [35346.473237]  ? rcu_is_watching+0x11/0xb0
> [35346.477165]  ext4_fill_super+0x22a/0x7c0 [ext4]
> [35346.481758]  get_tree_bdev+0x304/0x560
> [35346.485515]  ? __pfx_ext4_fill_super+0x10/0x10 [ext4]
> [35346.490622]  ? __pfx_get_tree_bdev+0x10/0x10
> [35346.494895]  ? security_sb_eat_lsm_opts+0x44/0x80
> [35346.499611]  vfs_get_tree+0x87/0x350
> [35346.503198]  do_new_mount+0x2a0/0x5f0
> [35346.506863]  ? __pfx_do_new_mount+0x10/0x10
> [35346.511049]  ? security_capable+0x53/0xa0
> [35346.515064]  path_mount+0x2d5/0x1520
> [35346.518644]  ? __pfx_path_mount+0x10/0x10
> [35346.522653]  ? user_path_at_empty+0x45/0x60
> [35346.526843]  __x64_sys_mount+0x1fe/0x270
> [35346.530775]  ? __pfx___x64_sys_mount+0x10/0x10
> [35346.535222]  do_syscall_64+0x8c/0x180
> [35346.538894]  ? __pfx_map_id_up+0x10/0x10
> [35346.542821]  ? __pfx_do_mkdirat+0x10/0x10
> [35346.546834]  ? ktime_get_coarse_real_ts64+0x130/0x170
> [35346.551890]  ? from_kgid_munged+0x84/0x110
> [35346.555996]  ? rcu_is_watching+0x11/0xb0
> [35346.559920]  ? lockdep_hardirqs_on_prepare+0x179/0x400
> [35346.565061]  ? do_syscall_64+0x98/0x180
> [35346.568899]  ? lockdep_hardirqs_on+0x78/0x100
> [35346.573259]  ? do_syscall_64+0x98/0x180
> [35346.577099]  ? clear_bhb_loop+0x45/0xa0
> [35346.580938]  ? clear_bhb_loop+0x45/0xa0
> [35346.584776]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> [35346.589829] RIP: 0033:0x7fd5de50f03e
> [35346.593407] Code: 48 8b 0d e5 ad 0e 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b2 ad 0e 00 f7 d8 64 89 01 48
> [35346.612155] RSP: 002b:00007ffc6fe2ccc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
> [35346.619720] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd5de50f03e
> [35346.626853] RDX: 000055e41568f630 RSI: 000055e41568f6b0 RDI: 000055e41568f690
> [35346.633984] RBP: 000055e41568f400 R08: 000055e41568f650 R09: 00007ffc6fe2b9f0
> [35346.641118] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> [35346.648251] R13: 000055e41568f630 R14: 000055e41568f690 R15: 000055e41568f400
> [35346.655388]  </TASK>
> [35346.657583] Modules linked in: ext4 mbcache jbd2 intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common i10nm_edac nfit x86_pkg_temp_thermal intel_powerclamp rfkill mlx5_ib coretemp dax_hmem cxl_acpi kvm_intel ib_uverbs mgag200 acpi_power_meter cxl_core iTCO_wdt i2c_algo_bit macsec mei_me dell_smbios iTCO_vendor_support drm_shmem_helper ipmi_ssif sunrpc dcdbas kvm rapl intel_cstate intel_uncore intel_th_gth wmi_bmof dell_wmi_descriptor einj pcspkr ib_core isst_if_mbox_pci drm_kms_helper isst_if_mmio mei intel_th_pci i2c_i801 isst_if_common ipmi_si i2c_smbus intel_vsec intel_pch_thermal acpi_ipmi intel_th ipmi_devintf ipmi_msghandler drm fuse xfs libcrc32c sd_mod t10_pi sg mlx5_core mlxfw crct10dif_pclmul crc32_pclmul crc32c_intel ahci tls libahci ghash_clmulni_intel psample dimlib megaraid_sas tg3 libata pci_hyperv_intf wmi
> [35346.733230] CR2: 0000000000000000
> [35346.736548] ---[ end trace 0000000000000000 ]---
> [35346.807404] RIP: 0010:0x0
> [35346.810031] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
> [35346.816557] RSP: 0018:ffa000002e0ef6c8 EFLAGS: 00010246
> [35346.821784] RAX: 0000000000000000 RBX: ff110015601db830 RCX: ffffffff81fa6fea
> [35346.828915] RDX: 1ffffffff0888c6f RSI: ffd400004f2556c0 RDI: ff110015601dba70
> [35346.836049] RBP: ffd400004f2556c0 R08: 0000000000000000 R09: fffa7c0009e4aad8
> [35346.843182] R10: ffd400004f2556c7 R11: 0000000000000000 R12: 0000000000000060
> [35346.850314] R13: ff11001323c64a50 R14: 0000000000000000 R15: 0000000000000000
> [35346.857447] FS:  00007fd5de6e6800(0000) GS:ff11002032400000(0000) knlGS:0000000000000000
> [35346.865532] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [35346.871277] CR2: ffffffffffffffd6 CR3: 0000001320da6001 CR4: 0000000000771ef0
> [35346.878410] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [35346.885543] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [35346.892675] PKRU: 55555554
> [35346.895390] note: mount[379238] exited with irqs disabled
> [35347.014675] EXT4-fs (sda3): unmounting filesystem bfceea3a-021b-46b0-944b-87e2d6693f83.
> 

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