https://bugzilla.kernel.org/show_bug.cgi?id=213877
Bug ID: 213877
Summary: Mount multiple SMR block devices exceed certain number
cause system non-response
Product: File System
Version: 2.5
Kernel Version: Linux DT1 5.13.4-200.fc34.x86_64 #1 SMP Tue Jul 20
20:27:29 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: f2fs
Assignee: [email protected]
Reporter: [email protected]
Regression: No
[1.] One-line summary of the problem:
Mount multiple SMR block devices exceed certain number cause system
non-response
[2.] Full description of the problem/report:
Created some F2FS on SMR devices (mkfs.f2fs -m), then mounted in sequence. Each
device is the same Model: HGST HSH721414AL (Size 14TB).
Empirically, found that when the amount of SMR device * 1.5Gb > System RAM, the
system ran out of memory and hung. No dmesg output. For example, 24 SMR Disk
need 24*1.5GB = 36GB. A system with 32G RAM can only mount 21 devices, the 22nd
device will be a reproducible cause of system hang.
The number of SMR devices with other FS mounted on this system does not
interfere with the result above.
[3.] Keywords (i.e., modules, networking, kernel):
F2FS, SMR, Memory
[4.] Kernel information
[4.1.] Kernel version (uname -a):
Linux 5.13.4-200.fc34.x86_64 #1 SMP Tue Jul 20 20:27:29 UTC 2021 x86_64 x86_64
x86_64 GNU/Linux
[4.2.] Kernel .config file:
Default Fedora 34 with f2fs-tools-1.14.0-2.fc34.x86_64
[5.] Most recent kernel version which did not have the bug:
None
[6.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/admin-guide/oops-tracing.rst)
None
[7.] A small shell script or example program which triggers the
problem (if possible)
mount /dev/sdX /mnt/0X
[8.] Memory consumption
With 24 * 14T SMR Block device with F2FS
free -g
total used free shared buff/cache available
Mem: 46 36 0 0 10 10
Swap: 0 0 0
With 3 * 14T SMR Block device with F2FS
free -g
total used free shared buff/cache
available
Mem: 7 5 0 0 1
1
Swap: 7 0 7
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