[bug report][mpt3sas] kmemleak observed after system boots up

[Yi Zhang <yi.zhang@xxxxxxxxxx>]

Hi

I found this kmemleak after the system boots up on 6.12-rc2, please
help check it and let me know if you need any info/test for it,
thanks.


# lspci | grep -i mpt
0006:01:00.0 Serial Attached SCSI controller: Broadcom / LSI
Fusion-MPT 12GSAS/PCIe Secure SAS38xx

# cat  /sys/kernel/debug/kmemleak
unreferenced object 0xffff0000e2db5600 (size 192):
  comm "hardirq", pid 0, jiffies 4294939685
  hex dump (first 32 bytes):
    00 56 db e2 00 00 ff ff 00 56 db e2 00 00 ff ff  .V.......V......
    00 00 00 48 00 00 00 00 18 56 db e2 00 00 ff ff  ...H.....V......
  backtrace (crc 242ab20e):
    [<ffffd02433c58b40>] kmemleak_alloc+0xb8/0xe0
    [<ffffd02431e0acf4>] __kmalloc_noprof+0x2c4/0x3e0
    [<ffffd023f574ed40>] alloc_fw_event_work+0x28/0x90 [mpt3sas]
    [<ffffd023f577467c>] mpt3sas_scsih_event_callback+0x114/0xd80 [mpt3sas]
    [<ffffd023f573046c>] _base_async_event.isra.0+0x104/0x6a8 [mpt3sas]
    [<ffffd023f5731f10>] _base_process_reply_queue+0x480/0x13a0 [mpt3sas]
    [<ffffd023f573347c>] _base_interrupt+0xa4/0xf8 [mpt3sas]
    [<ffffd0243176dea8>] __handle_irq_event_percpu+0x140/0x390
    [<ffffd0243176e280>] handle_irq_event+0xb8/0x200
    [<ffffd0243177cb04>] handle_fasteoi_irq+0x21c/0x9b0
    [<ffffd0243176b610>] generic_handle_domain_irq+0x80/0xb8
    [<ffffd024325db6fc>] __gic_handle_irq_from_irqson.isra.0+0x3cc/0x6d8
    [<ffffd02431430214>] gic_handle_irq+0x4c/0xb8

(gdb) l *(mpt3sas_scsih_event_callback+0x114)
0x5467c is in mpt3sas_scsih_event_callback
(drivers/scsi/mpt3sas/mpt3sas_scsih.c:10992).
10987 default: /* ignore the rest */
10988 return 1;
10989 }
10990
10991 sz = le16_to_cpu(mpi_reply->EventDataLength) * 4;
10992 fw_event = alloc_fw_event_work(sz);
10993 if (!fw_event) {
10994 ioc_err(ioc, "failure at %s:%d/%s()!\n",
10995 __FILE__, __LINE__, __func__);
10996 return 1;

-- 
Best Regards,
  Yi Zhang