On Thu, 24 Jul 2025 15:31:51 +0530, Nilay Shroff wrote:
> The kmemleak reports memory leaks related to elevator resources that
> were originally allocated in the ->init_hctx() method. The following
> leak traces are observed after running blktests block/040:
>
> unreferenced object 0xffff8881b82f7400 (size 512):
> comm "check", pid 68454, jiffies 4310588881
> 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 (crc 5bac8b34):
> __kvmalloc_node_noprof+0x55d/0x7a0
> sbitmap_init_node+0x15a/0x6a0
> kyber_init_hctx+0x316/0xb90
> blk_mq_init_sched+0x419/0x580
> elevator_switch+0x18b/0x630
> elv_update_nr_hw_queues+0x219/0x2c0
> __blk_mq_update_nr_hw_queues+0x36a/0x6f0
> blk_mq_update_nr_hw_queues+0x3a/0x60
> 0xffffffffc09ceb80
> 0xffffffffc09d7e0b
> configfs_write_iter+0x2b1/0x470
> vfs_write+0x527/0xe70
> ksys_write+0xff/0x200
> do_syscall_64+0x98/0x3c0
> entry_SYSCALL_64_after_hwframe+0x76/0x7e
> unreferenced object 0xffff8881b82f6000 (size 512):
> comm "check", pid 68454, jiffies 4310588881
> 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 (crc 5bac8b34):
> __kvmalloc_node_noprof+0x55d/0x7a0
> sbitmap_init_node+0x15a/0x6a0
> kyber_init_hctx+0x316/0xb90
> blk_mq_init_sched+0x419/0x580
> elevator_switch+0x18b/0x630
> elv_update_nr_hw_queues+0x219/0x2c0
> __blk_mq_update_nr_hw_queues+0x36a/0x6f0
> blk_mq_update_nr_hw_queues+0x3a/0x60
> 0xffffffffc09ceb80
> 0xffffffffc09d7e0b
> configfs_write_iter+0x2b1/0x470
> vfs_write+0x527/0xe70
> ksys_write+0xff/0x200
> do_syscall_64+0x98/0x3c0
> entry_SYSCALL_64_after_hwframe+0x76/0x7e
> unreferenced object 0xffff8881b82f5800 (size 512):
> comm "check", pid 68454, jiffies 4310588881
> 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 (crc 5bac8b34):
> __kvmalloc_node_noprof+0x55d/0x7a0
> sbitmap_init_node+0x15a/0x6a0
> kyber_init_hctx+0x316/0xb90
> blk_mq_init_sched+0x419/0x580
> elevator_switch+0x18b/0x630
> elv_update_nr_hw_queues+0x219/0x2c0
> __blk_mq_update_nr_hw_queues+0x36a/0x6f0
> blk_mq_update_nr_hw_queues+0x3a/0x60
> 0xffffffffc09ceb80
> 0xffffffffc09d7e0b
> configfs_write_iter+0x2b1/0x470
> vfs_write+0x527/0xe70
>
> [...]
Applied, thanks!
[1/1] block: restore two stage elevator switch while running nr_hw_queue update
commit: 5989bfe6ac6bf230c2c84e118c786be0ed4be3f4
Best regards,
--
Jens Axboe
