[LU-12755] CPU soft lockup on mkfs.lustre

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Affects Version/s: Upstream
• Labels: hang mkfs.lustre
• Environment: Red Hat 7.7 on VMware ; Red Hat 7.7 on HPE ProLiant DL380 Gen10 ; Red Hat 7.7 on HPE Synergy 480 Gen10

Epic/Theme

Lustre-2.12.57

• Severity: 3

Epic

hang server

• Assignee: Jian Yu
• Reporter: Tamas Kazinczy (Inactive)

Description

After successfully creating packages for Red Hat 7.7

(e.g. lustre-2.12.57_35_g55a7e2d-1.el7.x86_64.rpm)

I get CPU soft lockups when trying to create an MGS with LDISKFS backend.

NMI watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [mkfs.lustre:31220]

More details from log:

Sep  6 10:41:00 mgs1 kernel: Call Trace:Sep  6 10:41:00 mgs1 kernel: [<ffffffff9bd73365>] queued_spin_lock_slowpath+0xb/0xf
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9bd81ad0>] _raw_spin_lock+0x20/0x30
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b865e2e>] igrab+0x1e/0x60
Sep  6 10:41:00 mgs1 kernel: [<ffffffffc06bd88b>] ldiskfs_quota_off+0x3b/0x130 [ldiskfs]
Sep  6 10:41:00 mgs1 kernel: [<ffffffffc06c091d>] ldiskfs_put_super+0x4d/0x400 [ldiskfs]
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b84b13d>] generic_shutdown_super+0x6d/0x100
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b84b5b7>] kill_block_super+0x27/0x70
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b84b91e>] deactivate_locked_super+0x4e/0x70
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b84c0a6>] deactivate_super+0x46/0x60
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b86abff>] cleanup_mnt+0x3f/0x80
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b86ac92>] __cleanup_mnt+0x12/0x20
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b6c1c0b>] task_work_run+0xbb/0xe0
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9b62cc65>] do_notify_resume+0xa5/0xc0
Sep  6 10:41:00 mgs1 kernel: [<ffffffff9bd8c23b>] int_signal+0x12/0x17
Sep  6 10:41:00 mgs1 kernel: Code: 47 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 66 90 b9 01 00 00 00 8b 17 85 d2 74 0d 83 fa 03 74 08 f3 90 <8b> 17 85 d2 75 f3 89 d0 f0 0f b1 0f 39 c2 75 e3 5d 66 90 c3 0f

I also tried to go for an MDS/MGS pair on the DL380 but mkfs.lustre got stuck the same way 

as seen on VMware.