memory leak in blk_iolatency

memory leak in blk_iolatency_init
Status: upstream: reported C repro on 2021/09/13 23:28
Reported-by: syzbot+01321b15cc98e6bf96d6@syzkaller.appspotmail.com
Fix commit: 6f5ddde41069 blkcg: fix memory leak in blk_iolatency_init
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 82d, last: 31d

Sample crash report:

BUG: memory leak
unreferenced object 0xffff888104729800 (size 96):
  comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
  hex dump (first 32 bytes):
    00 49 c9 85 ff ff ff ff e0 b0 8b 03 81 88 ff ff  .I..............
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
    [<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
    [<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
    [<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
    [<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
    [<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
    [<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
    [<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
    [<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
    [<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
    [<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
    [<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
    [<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888104729400 (size 96):
  comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
  hex dump (first 32 bytes):
    00 49 c9 85 ff ff ff ff 90 a8 8b 03 81 88 ff ff  .I..............
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
    [<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
    [<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
    [<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
    [<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
    [<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
    [<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
    [<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
    [<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
    [<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
    [<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
    [<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
    [<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888104767e00 (size 96):
  comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
  hex dump (first 32 bytes):
    00 49 c9 85 ff ff ff ff 40 a0 8b 03 81 88 ff ff  .I......@.......
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
    [<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
    [<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
    [<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
    [<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
    [<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
    [<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
    [<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
    [<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
    [<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
    [<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
    [<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
    [<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888104767500 (size 96):
  comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
  hex dump (first 32 bytes):
    00 49 c9 85 ff ff ff ff 60 31 88 03 81 88 ff ff  .I......`1......
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
    [<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
    [<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
    [<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
    [<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
    [<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
    [<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
    [<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
    [<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
    [<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
    [<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
    [<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
    [<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory

Crashes (38):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/10/23 18:57	upstream	9c0c4d24ac00	282f03fb	.config	log	report	syz	C	memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/31 14:52	upstream	180eca540ae0	098b5d53	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/30 15:15	upstream	f25a5481af12	098b5d53	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/30 11:29	upstream	f25a5481af12	098b5d53	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/30 05:51	upstream	f25a5481af12	098b5d53	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/30 00:15	upstream	f25a5481af12	098b5d53	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/29 08:25	upstream	411a44c24a56	2353a3ec	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/28 17:27	upstream	1fc596a56b33	be531bb4	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/28 08:26	upstream	1fc596a56b33	be531bb4	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/28 07:51	upstream	1fc596a56b33	be531bb4	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/28 07:01	upstream	1fc596a56b33	be531bb4	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/28 01:06	upstream	d25f27432f80	373bf66b	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/27 15:27	upstream	d25f27432f80	373bf66b	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/26 23:04	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/26 21:09	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/26 09:57	upstream	c2b43854aad9	c1132b49	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/26 02:29	upstream	c2b43854aad9	c1132b49	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 18:41	upstream	87066fdd2e30	4f0000ee	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 17:40	upstream	87066fdd2e30	4f0000ee	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 16:46	upstream	87066fdd2e30	4f0000ee	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 15:23	upstream	87066fdd2e30	4f0000ee	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 12:31	upstream	87066fdd2e30	4f0000ee	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/25 01:55	upstream	6c62666d8879	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/23 22:55	upstream	9c0c4d24ac00	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/23 13:38	upstream	9c0c4d24ac00	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/23 05:47	upstream	64222515138e	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/23 00:10	upstream	64222515138e	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/22 22:18	upstream	64222515138e	282f03fb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/22 15:06	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/22 09:32	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/21 09:43	upstream	8e37395c3a5d	f111d03b	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/21 09:07	upstream	8e37395c3a5d	f111d03b	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/20 21:14	upstream	8e37395c3a5d	418a00eb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/20 12:53	upstream	d9abdee5fd5a	418a00eb	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/19 15:19	upstream	519d81956ee2	24dc29db	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/19 14:04	upstream	519d81956ee2	24dc29db	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/10/19 05:05	upstream	519d81956ee2	24dc29db	.config	log	report	syz		memory leak in blk_iolatency_init
ci-upstream-gce-leak	2021/09/09 23:20	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	syz		memory leak in blk_iolatency_init