5fbc7c59fd22c5a6531b40b0759624b680a95e52 in ubuntu_btrfs_kernel_fixes triggers system hang on X/B i386

[Po-Hsu Lin]

I think this is identical to bug 1812845

Run 5fbc7c59fd22c5a6531b40b0759624b680a95e52 test in ubuntu_btrfs_kernel_fixes on an i386 system will make the SUT hang.

This test will:
1. Create a 5-disk RAID5
2. Corrupt one of the device
3. Mount the FS as degraded
4. run btrfs scrub

In bug 1812845 it just skipped step 2 and 3, and Andrea's patch states that this is caused by finish_parity_scrub(), so I think they're the same. If that's the case we should disable this test for now.

This is the last thing we can see from the syslog:

Mar 22 10:45:14 onza kernel: [12628.790147] Invoking test 5fbc7c59fd22c5a6531b40b0759624b680a95e52
Mar 22 10:45:15 onza kernel: [12629.635268] BTRFS: device fsid 7031ed1d-0a3e-41dd-8cca-348d4e8ab82a devid 1 transid 5 /dev/loop0
Mar 22 10:45:15 onza kernel: [12629.759316] BTRFS: device fsid 7031ed1d-0a3e-41dd-8cca-348d4e8ab82a devid 2 transid 5 /dev/loop1
Mar 22 10:45:15 onza kernel: [12629.902400] BTRFS: device fsid 7031ed1d-0a3e-41dd-8cca-348d4e8ab82a devid 3 transid 5 /dev/loop2
Mar 22 10:45:15 onza kernel: [12630.031103] BTRFS: device fsid 7031ed1d-0a3e-41dd-8cca-348d4e8ab82a devid 4 transid 5 /dev/loop3
Mar 22 10:45:15 onza kernel: [12630.202480] BTRFS: device fsid 7031ed1d-0a3e-41dd-8cca-348d4e8ab82a devid 5 transid 5 /dev/loop4
Mar 22 10:45:16 onza kernel: [12631.419614] BTRFS info (device loop4): allowing degraded mounts
Mar 22 10:45:16 onza kernel: [12631.419619] BTRFS info (device loop4): disk space caching is enabled
Mar 22 10:45:16 onza kernel: [12631.419622] BTRFS info (device loop4): has skinny extents
Mar 22 10:45:16 onza kernel: [12631.419624] BTRFS info (device loop4): flagging fs with big metadata feature
Mar 22 10:45:16 onza kernel: [12631.420993] BTRFS warning (device loop4): devid 2 uuid f81e256a-ab46-4948-aa3d-3e8d0234fa9b is missing
Mar 22 10:45:16 onza kernel: [12631.421888] BTRFS info (device loop4): creating UUID tree
Mar 22 10:45:17 onza kernel: [12631.574478] ------------[ cut here ]------------
Mar 22 10:45:17 onza kernel: [12631.574482] kernel BUG at /build/linux-qJwW2z/linux-4.15.0/mm/highmem.c:350!
Mar 22 10:45:17 onza kernel: [12631.630790] invalid opcode: 0000 [#1] SMP
Mar 22 10:45:18 onza kernel: [12631.662771] Modules linked in: btrfs zstd_compress gpio_ich intel_powerclamp coretemp kvm_intel dcdbas kvm ipmi_ssif irqbypass input_leds joydev intel_cstate i7core_edac ipmi_si ipmi_devintf lpc_ich acpi_power_meter ipmi_msghandler shpchp mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear mgag200 i2c_algo_bit ttm drm_kms_helper hid_generic syscopyarea sysfillrect sysimgblt fb_sys_fops usbhid hid mpt3sas drm pata_acpi bnx2 raid_class scsi_transport_sas wmi [last unloaded: zstd_compress]
Mar 22 10:45:18 onza kernel: [12632.153647] CPU: 1 PID: 3852 Comm: kworker/u16:4 Not tainted 4.15.0-46-generic #49-Ubuntu
Mar 22 10:45:18 onza kernel: [12632.219025] Hardware name: Dell Inc. PowerEdge R310/05XKKK, BIOS 1.11.0 09/18/2012
Mar 22 10:45:18 onza kernel: [12632.279533] Workqueue: btrfs-rmw btrfs_rmw_helper [btrfs]
Mar 22 10:45:18 onza kernel: [12632.322819] EIP: kunmap_high+0xaa/0xb0
Mar 22 10:45:18 onza kernel: [12632.352697] EFLAGS: 00010246 CPU: 1
Mar 22 10:45:18 onza kernel: [12632.380572] EAX: 00000028 EBX: fffff000 ECX: 00000001 EDX: 00000000
Mar 22 10:45:18 onza kernel: [12632.430629] ESI: 00000005 EDI: 00000000 EBP: d3669e50 ESP: d3669e4c
Mar 22 10:45:18 onza kernel: [12632.480686] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Mar 22 10:45:18 onza kernel: [12632.523881] CR0: 80050033 CR2: b542effc CR3: 17e16000 CR4: 000006f0
Mar 22 10:45:18 onza kernel: [12632.573938] Call Trace:
Mar 22 10:45:18 onza kernel: [12632.593428] kunmap+0x3e/0x50
Mar 22 10:45:18 onza kernel: [12632.617106] finish_parity_scrub+0x24d/0x570 [btrfs]
Mar 22 10:45:18 onza kernel: [12632.656764] validate_rbio_for_parity_scrub+0xc2/0xd0 [btrfs]
Mar 22 10:45:18 onza kernel: [12632.702800] scrub_parity_work+0x24a/0x260 [btrfs]
Mar 22 10:45:18 onza kernel: [12632.741072] normal_work_helper+0x7d/0x2f0 [btrfs]
Mar 22 10:45:18 onza kernel: [12632.779343] btrfs_rmw_helper+0x10/0x20 [btrfs]
Mar 22 10:45:18 onza kernel: [12632.815498] process_one_work+0x1b9/0x3d0
Mar 22 10:45:18 onza kernel: [12632.847459] worker_thread+0x37/0x420
Mar 22 10:45:18 onza kernel: [12632.876717] kthread+0xf0/0x110
Mar 22 10:45:18 onza kernel: [12632.901744] ? process_one_work+0x3d0/0x3d0
Mar 22 10:45:18 onza kernel: [12632.935164] ? kthread_create_worker_on_cpu+0x20/0x20
Mar 22 10:45:18 onza kernel: [12632.975448] ret_from_fork+0x2e/0x38
Mar 22 10:45:18 onza kernel: [12633.004009] Code: 2c ee ff 58 8b 5d fc c9 c3 90 8d b4 26 00 00 00 00 a1 a0 d1 c4 d7 31 c9 3d a0 d1 c4 d7 0f 95 c1 eb bc 8d b4 26 00 00 00 00 0f 0b <0f> 0b 8d 74 26 00 66 66 66 66 90 55 89 e5 56 53 31 db e8 2f ef
Mar 22 10:45:18 onza kernel: [12633.154375] EIP: kunmap_high+0xaa/0xb0 SS:ESP: 0068:d3669e4c
Mar 22 10:45:18 onza kernel: [12633.199643] ---[ end trace 84af65c59f943315 ]---

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-46-generic 4.15.0-46.49
ProcVersionSignature: User Name 4.15.0-46.49-generic 4.15.18
Uname: Linux 4.15.0-46-generic i686
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Mar 22 10:54 seq
 crw-rw---- 1 root audio 116, 33 Mar 22 10:54 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Fri Mar 22 10:55:57 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Dell Inc. PowerEdge R310
PciMultimedia:

ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic root=UUID=6aaa11f6-d386-4c0c-b4b8-38e6c408980a ro console=ttyS0,1152008n1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-46-generic N/A
 linux-backports-modules-4.15.0-46-generic N/A
 linux-firmware 1.173.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/18/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.11.0
dmi.board.name: 05XKKK
dmi.board.vendor: Dell Inc.
dmi.board.version: A05
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.11.0:bd09/18/2012:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R310
dmi.sys.vendor: Dell Inc.

[Po-Hsu Lin (cypressyew)]

Test passed on:
T-AMD64 / T-i386 / T-ARM64 / T-P8
X-AMD64 / X-ARM64 / X-P8 / X-s390x
B-ARM64 / B-ARM64 / B-P8 (B-amd64 was not tested yet)
C-i386 / C-ARM64 / C-P8 (C-amd64 was not tested yet)
D-i386 / D-ARM64 / D-P8 (D-amd64 was not tested yet)

Failed on
X-i386
B-i386

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Po-Hsu Lin (cypressyew)]

I have built a test kernel with the patch in bug 1812845, yes it's waiting for the same fix.

For now this test has been disabled.
https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=0707ddf3762e8d05a3f8e98f45a6e89d1a3c41eb

Will need to re-enable it when we have the fix applied.