** Changed in: kunpeng920/upstream-kernel
Milestone: None => linux-v5.5
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https://bugs.launchpad.net/bugs/1854550
Title:
[scsi-1130]scsi: scsi_transport_sas: Fix memory leak when removing
devices
Status in kunpeng920:
Triaged
Status in kunpeng920 ubuntu-18.04 series:
Invalid
Status in kunpeng920 ubuntu-18.04-hwe series:
Triaged
Status in kunpeng920 ubuntu-19.04 series:
Won't Fix
Status in kunpeng920 ubuntu-19.10 series:
Won't Fix
Status in kunpeng920 ubuntu-20.04 series:
Triaged
Status in kunpeng920 upstream-kernel series:
Fix Committed
Status in linux package in Ubuntu:
Triaged
Bug description:
"[Steps to reproduce]
Enable memleak, and do as follows:
root@(none)$ echo 0 >
/sys/devices/platform/HISI0162:01/host0/port-0:0/expander-0:0/port-0:0:10/phy-0:0:10/sas_phy/phy-0:0:10/enable
[ 79.857888] hisi_sas_v2_hw HISI0162:01: dev[7:1] is gone
root@(none)$ echo scan > /sys/kernel/debug/kmemleak
[ 131.656603] kmemleak: 3 new suspected memory leaks (see
/sys/kernel/debug/kmemleak)
root@(none)$ more /sys/kernel/debug/kmemleak
unreferenced object 0xffff041da5c66000 (size 256):
comm ""kworker/u128:1"", pid 549, jiffies 4294898543 (age 113.728s)
hex dump (first 32 bytes):
00 5e c6 a5 1d 04 ff ff 01 00 00 00 00 00 00 00 .^..............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<(____ptrval____)>] kmem_cache_alloc+0x188/0x260
[<(____ptrval____)>] bsg_setup_queue+0x48/0x1a8
[<(____ptrval____)>] sas_rphy_add+0x108/0x2d0
[<(____ptrval____)>] sas_probe_devices+0x168/0x208
[<(____ptrval____)>] sas_discover_domain+0x660/0x9c8
[<(____ptrval____)>] process_one_work+0x3f8/0x690
[<(____ptrval____)>] worker_thread+0x70/0x6a0
[<(____ptrval____)>] kthread+0x1b8/0x1c0
[<(____ptrval____)>] ret_from_fork+0x10/0x18
unreferenced object 0xffff041d8c075400 (size 128):
comm ""kworker/u128:1"", pid 549, jiffies 4294898543 (age 113.728s)
hex dump (first 32 bytes):
00 40 25 97 1d 00 ff ff 00 00 00 00 00 00 00 00 .@%.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<(____ptrval____)>] __kmalloc_node+0x1a8/0x2c8
[<(____ptrval____)>] blk_mq_realloc_tag_set_tags.part.70+0x48/0xd8
[<(____ptrval____)>] blk_mq_alloc_tag_set+0x1dc/0x530
[<(____ptrval____)>] bsg_setup_queue+0xe8/0x1a8
[<(____ptrval____)>] sas_rphy_add+0x108/0x2d0
[<(____ptrval____)>] sas_probe_devices+0x168/0x208
[<(____ptrval____)>] sas_discover_domain+0x660/0x9c8
[<(____ptrval____)>] process_one_work+0x3f8/0x690
[<(____ptrval____)>] worker_thread+0x70/0x6a0
[<(____ptrval____)>] kthread+0x1b8/0x1c0
[<(____ptrval____)>] ret_from_fork+0x10/0x18
unreferenced object 0xffff041da5c65e00 (size 256):
comm ""kworker/u128:1"", pid 549, jiffies 4294898543 (age 113.728s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<(____ptrval____)>] __kmalloc_node+0x1a8/0x2c8
[<(____ptrval____)>] blk_mq_alloc_tag_set+0x254/0x530
[<(____ptrval____)>] bsg_setup_queue+0xe8/0x1a8
[<(____ptrval____)>] sas_rphy_add+0x108/0x2d0
[<(____ptrval____)>] sas_probe_devices+0x168/0x208
[<(____ptrval____)>] sas_discover_domain+0x660/0x9c8
[<(____ptrval____)>] process_one_work+0x3f8/0x690
[<(____ptrval____)>] worker_thread+0x70/0x6a0
[<(____ptrval____)>] kthread+0x1b8/0x1c0
[<(____ptrval____)>] ret_from_fork+0x10/0x18
root@(none)$
[solution]
Fix by doing the queue removal in one place - in sas_rphy_remove() -
instead of unregistering the queue in sas_rphy_remove() and finally
cleaning up the queue in calling blk_cleanup_queue() from
sas_end_device_release() or sas_expander_release().
Function bsg_remove_queue() can handle a NULL pointer q, so remove the
precheck in sas_rphy_remove().
"
scsi: scsi_transport_sas: Fix memory leak when removing devices
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