BUG: memory leak unreferenced object 0xffff88811937d800 (size 2048): comm "syz-executor455", pid 6924, jiffies 4294985718 (age 168.490s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 ............... backtrace: [<00000000e6798fd8>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] [<00000000e6798fd8>] slab_post_alloc_hook mm/slab.h:522 [inline] [<00000000e6798fd8>] slab_alloc mm/slab.c:3319 [inline] [<00000000e6798fd8>] __do_kmalloc mm/slab.c:3653 [inline] [<00000000e6798fd8>] __kmalloc+0x169/0x300 mm/slab.c:3664 [<00000000a68aec59>] kmalloc include/linux/slab.h:557 [inline] [<00000000a68aec59>] bio_alloc_bioset+0x1b8/0x2c0 block/bio.c:440 [<00000000bf01f7b4>] bio_kmalloc include/linux/bio.h:405 [inline] [<00000000bf01f7b4>] bio_copy_user_iov+0x112/0x4b0 block/bio.c:1263 [<0000000068bc0de1>] __blk_rq_map_user_iov block/blk-map.c:73 [inline] [<0000000068bc0de1>] blk_rq_map_user_iov+0xc6/0x2b0 block/blk-map.c:142 [<0000000059c10c31>] blk_rq_map_user+0x71/0xb0 block/blk-map.c:172 [<000000004420be9a>] sg_start_req drivers/scsi/sg.c:1813 [inline] [<000000004420be9a>] sg_common_write.isra.0+0x619/0xa10 drivers/scsi/sg.c:809 [<000000006d7022ff>] sg_write.part.0+0x325/0x570 drivers/scsi/sg.c:709 [<0000000015b7ad78>] sg_write+0x44/0x64 drivers/scsi/sg.c:617 [<000000007709985c>] __vfs_write+0x43/0xa0 fs/read_write.c:494 [<00000000f60147df>] vfs_write fs/read_write.c:558 [inline] [<00000000f60147df>] vfs_write+0xee/0x210 fs/read_write.c:542 [<00000000dac82000>] ksys_write+0x7c/0x130 fs/read_write.c:611 [<00000000df2979c8>] __do_sys_write fs/read_write.c:623 [inline] [<00000000df2979c8>] __se_sys_write fs/read_write.c:620 [inline] [<00000000df2979c8>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620 [<00000000b8baff0b>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:296 [<00000000085eb524>] entry_SYSCALL_64_after_hwframe+0x44/0xa9