random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:328 [inline]
BUG: KASAN: use-after-free in work_is_static_object+0x39/0x40 kernel/workqueue.c:442
Read of size 8 at addr ffff8801b9061e20 by task kworker/1:1/40

CPU: 1 PID: 40 Comm: kworker/1:1 Not tainted 4.18.0-rc3-next-20180709+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 constant_test_bit arch/x86/include/asm/bitops.h:328 [inline]
 work_is_static_object+0x39/0x40 kernel/workqueue.c:442
 debug_object_activate+0x2fc/0x690 lib/debugobjects.c:508
 debug_work_activate kernel/workqueue.c:491 [inline]
 __queue_work+0x1ca/0x1410 kernel/workqueue.c:1380
 queue_work_on+0x19a/0x1e0 kernel/workqueue.c:1486
 queue_work include/linux/workqueue.h:512 [inline]
 schedule_work include/linux/workqueue.h:570 [inline]
 p9_poll_mux net/9p/trans_fd.c:628 [inline]
 p9_poll_workfn+0x55e/0x6d0 net/9p/trans_fd.c:1107
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415

Allocated by task 4479:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
 kmalloc include/linux/slab.h:513 [inline]
 kzalloc include/linux/slab.h:707 [inline]
 p9_fd_open net/9p/trans_fd.c:796 [inline]
 p9_fd_create+0x1a7/0x3f0 net/9p/trans_fd.c:1036
 p9_client_create+0x915/0x16c9 net/9p/client.c:1062
 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400
 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
 legacy_get_tree+0x118/0x440 fs/fs_context.c:659
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1751
 do_new_mount fs/namespace.c:2567 [inline]
 do_mount+0x6c1/0x1fb0 fs/namespace.c:2889
 ksys_mount+0x12d/0x140 fs/namespace.c:3105
 __do_sys_mount fs/namespace.c:3119 [inline]
 __se_sys_mount fs/namespace.c:3116 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3116
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4479:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 p9_fd_close+0x416/0x5b0 net/9p/trans_fd.c:893
 p9_client_create+0xac2/0x16c9 net/9p/client.c:1076
 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400
 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
 legacy_get_tree+0x118/0x440 fs/fs_context.c:659
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1751
 do_new_mount fs/namespace.c:2567 [inline]
 do_mount+0x6c1/0x1fb0 fs/namespace.c:2889
 ksys_mount+0x12d/0x140 fs/namespace.c:3105
 __do_sys_mount fs/namespace.c:3119 [inline]
 __se_sys_mount fs/namespace.c:3116 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3116
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801b9061d00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 288 bytes inside of
 512-byte region [ffff8801b9061d00, ffff8801b9061f00)
The buggy address belongs to the page:
page:ffffea0006e41840 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0006d29508 ffffea0006bef748 ffff8801da800940
raw: 0000000000000000 ffff8801b9061080 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b9061d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b9061d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801b9061e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8801b9061e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b9061f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================