Hello
I found the kmemleak issue after blktests nvme/tcp tests on the latest
linux-block/for-next, please help check it and let me know if you need
any info/testing for it, thanks.
# dmesg | grep kmemleak
[ 2580.572467] kmemleak: 92 new suspected memory leaks (see
/sys/kernel/debug/kmemleak)
# cat kmemleak.log
unreferenced object 0xffff8885a1abe740 (size 32):
comm "kworker/40:1H", pid 799, jiffies 4296062986
hex dump (first 32 bytes):
c2 4a 4a 04 00 ea ff ff 00 00 00 00 00 10 00 00 .JJ.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 6328eade):
[<ffffffffa7f2657c>] __kmalloc+0x37c/0x480
[<ffffffffa86a9b1f>] sgl_alloc_order+0x7f/0x360
[<ffffffffc261f6c5>] lo_read_simple+0x1d5/0x5b0 [loop]
[<ffffffffc26287ef>] 0xffffffffc26287ef
[<ffffffffc262a2c4>] 0xffffffffc262a2c4
[<ffffffffc262a881>] 0xffffffffc262a881
[<ffffffffa76adf3c>] process_one_work+0x89c/0x19f0
[<ffffffffa76b0813>] worker_thread+0x583/0xd20
[<ffffffffa76ce2a3>] kthread+0x2f3/0x3e0
[<ffffffffa74a804d>] ret_from_fork+0x2d/0x70
[<ffffffffa7406e4a>] ret_from_fork_asm+0x1a/0x30
unreferenced object 0xffff88a8b03647c0 (size 16):
comm "kworker/40:1H", pid 799, jiffies 4296062986
hex dump (first 16 bytes):
c0 4a 4a 04 00 ea ff ff 00 10 00 00 00 00 00 00 .JJ.............
backtrace (crc 860ce62b):
[<ffffffffa7f2657c>] __kmalloc+0x37c/0x480
[<ffffffffc261f805>] lo_read_simple+0x315/0x5b0 [loop]
[<ffffffffc26287ef>] 0xffffffffc26287ef
[<ffffffffc262a2c4>] 0xffffffffc262a2c4
[<ffffffffc262a881>] 0xffffffffc262a881
[<ffffffffa76adf3c>] process_one_work+0x89c/0x19f0
[<ffffffffa76b0813>] worker_thread+0x583/0xd20
[<ffffffffa76ce2a3>] kthread+0x2f3/0x3e0
[<ffffffffa74a804d>] ret_from_fork+0x2d/0x70
[<ffffffffa7406e4a>] ret_from_fork_asm+0x1a/0x30
(gdb) l *(lo_read_simple+0x1d5)
0x66c5 is in lo_read_simple (drivers/block/loop.c:284).
279 struct bio_vec bvec;
280 struct req_iterator iter;
281 struct iov_iter i;
282 ssize_t len;
283
284 rq_for_each_segment(bvec, rq, iter) {
285 iov_iter_bvec(&i, ITER_DEST, &bvec, 1, bvec.bv_len);
286 len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
287 if (len < 0)
288 return len;
(gdb) l *(lo_read_simple+0x315)
0x6805 is in lo_read_simple (./include/linux/bio.h:120).
115 iter->bi_sector += bytes >> 9;
116
117 if (bio_no_advance_iter(bio))
118 iter->bi_size -= bytes;
119 else
120 bvec_iter_advance_single(bio->bi_io_vec, iter, bytes);
121 }
122
123 void __bio_advance(struct bio *, unsigned bytes);
124
--
Best Regards,
Yi Zhang
