binder: 4887:4889 transaction failed 29189/-22, size 72-24 line 3014
binder: undelivered TRANSACTION_ERROR: 29189
==================================================================
BUG: KASAN: use-after-free in disk_unblock_events+0x55/0x60 block/genhd.c:1543
Read of size 8 at addr ffff8800b9f4da68 by task syz-executor.0/2123

CPU: 0 PID: 2123 Comm: syz-executor.0 Not tainted 4.4.174+ #4
 0000000000000000 4bed670844cebe9f ffff8800a848f730 ffffffff81aad1a1
 0000000000000000 ffffea0002e7d200 ffff8800b9f4da68 0000000000000008
 0000000000000000 ffff8800a848f768 ffffffff81490120 0000000000000000
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81490120>] print_address_description+0x6f/0x21b mm/kasan/report.c:252
 [<ffffffff81490358>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81490358>] kasan_report mm/kasan/report.c:408 [inline]
 [<ffffffff81490358>] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393
 [<ffffffff81484ed4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81a82965>] disk_unblock_events+0x55/0x60 block/genhd.c:1543
 [<ffffffff8154efcc>] __blkdev_get+0x70c/0xdf0 fs/block_dev.c:1297
 [<ffffffff81551938>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1353
 [<ffffffff8155219a>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1508
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Allocated by task 2123:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81483f22>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81483f22>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81483f22>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
 [<ffffffff81484197>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
 [<ffffffff814801a3>] kmem_cache_alloc_trace+0x123/0x2d0 mm/slub.c:2642
 [<ffffffff81a81b50>] kmem_cache_alloc_node_trace include/linux/slab.h:367 [inline]
 [<ffffffff81a81b50>] kmalloc_node include/linux/slab.h:514 [inline]
 [<ffffffff81a81b50>] kzalloc_node include/linux/slab.h:631 [inline]
 [<ffffffff81a81b50>] alloc_disk_node+0x50/0x3c0 block/genhd.c:1282
 [<ffffffff81a81edb>] alloc_disk+0x1b/0x20 block/genhd.c:1274
 [<ffffffff81d436d0>] loop_add+0x380/0x830 drivers/block/loop.c:1857
 [<ffffffff81d43f44>] loop_probe+0x154/0x180 drivers/block/loop.c:1963
 [<ffffffff81d0efb1>] kobj_lookup+0x221/0x410 drivers/base/map.c:124
 [<ffffffff81a7fe3c>] get_gendisk+0x3c/0x2e0 block/genhd.c:689
 [<ffffffff8154ec5c>] __blkdev_get+0x39c/0xdf0 fs/block_dev.c:1193
 [<ffffffff81551938>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1353
 [<ffffffff8155219a>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1508
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Freed by task 2123:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81484820>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81484820>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81484820>] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589
 [<ffffffff81481c44>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff81481c44>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff81481c44>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff81481c44>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff81a80375>] disk_release+0x255/0x330 block/genhd.c:1118
 [<ffffffff81cf785d>] device_release+0x7d/0x220 drivers/base/core.c:247
 [<ffffffff81ab309c>] kobject_cleanup lib/kobject.c:643 [inline]
 [<ffffffff81ab309c>] kobject_release lib/kobject.c:672 [inline]
 [<ffffffff81ab309c>] kref_sub include/linux/kref.h:73 [inline]
 [<ffffffff81ab309c>] kref_put include/linux/kref.h:98 [inline]
 [<ffffffff81ab309c>] kobject_put+0x14c/0x260 lib/kobject.c:689
 [<ffffffff81a7e013>] put_disk+0x23/0x30 block/genhd.c:1346
 [<ffffffff8154ef2c>] __blkdev_get+0x66c/0xdf0 fs/block_dev.c:1290
 [<ffffffff81551938>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1353
 [<ffffffff8155219a>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1508
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

The buggy address belongs to the object at ffff8800b9f4d500
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1384 bytes inside of
 2048-byte region [ffff8800b9f4d500, ffff8800b9f4dd00)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at ffffea000fd7aa40
IP: [<ffffffff814891ba>] constant_test_bit arch/x86/include/asm/bitops.h:311 [inline]
IP: [<ffffffff814891ba>] PageLocked include/linux/page-flags.h:209 [inline]
IP: [<ffffffff814891ba>] migration_entry_to_page include/linux/swapops.h:129 [inline]
IP: [<ffffffff814891ba>] __migration_entry_wait+0xea/0x1e0 mm/migrate.c:221
PGD 21f7fa067 PUD 21f7f9067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2124 Comm: syz-executor.5 Not tainted 4.4.174+ #4
task: ffff8800bbbe2f80 task.stack: ffff8801c3730000
RIP: 0010:[<ffffffff814891ba>]  [<ffffffff814891ba>] constant_test_bit arch/x86/include/asm/bitops.h:311 [inline]
RIP: 0010:[<ffffffff814891ba>]  [<ffffffff814891ba>] PageLocked include/linux/page-flags.h:209 [inline]
RIP: 0010:[<ffffffff814891ba>]  [<ffffffff814891ba>] migration_entry_to_page include/linux/swapops.h:129 [inline]
RIP: 0010:[<ffffffff814891ba>]  [<ffffffff814891ba>] __migration_entry_wait+0xea/0x1e0 mm/migrate.c:221
RSP: 0000:ffff8801c3737ce8  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 000000000000001f RCX: 0000000000001e1c
RDX: 1ffffd4001faf548 RSI: ffffffff81489181 RDI: ffffffff8142ac50
RBP: ffff8801c3737d08 R08: 0000000000000001 R09: ffff8800bbbe3890
R10: ffffffff83a2c5d0 R11: 0000000000000000 R12: ffff8800b48193c8
R13: ffffea000fd7aa40 R14: ffff8801d8b1da40 R15: ffff8800b48193c8
FS:  0000000002833940(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffea000fd7aa40 CR3: 00000001c3724000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 00000000a7c1d000 ffff8800000002b8 00003ffffffff000 ffff8801d8b1da40
 ffff8801c3737d40 ffffffff814893e1 ffff8801c3737e98 ffff8800a7c1d2b8
 ffffc00000000c50 ffffffff8142ac50 0000000000000000 ffff8801c3737ec0
Call Trace:
 [<ffffffff814893e1>] migration_entry_wait+0x131/0x160 mm/migrate.c:245
 [<ffffffff8143c588>] do_swap_page mm/memory.c:2552 [inline]
 [<ffffffff8143c588>] handle_pte_fault mm/memory.c:3349 [inline]
 [<ffffffff8143c588>] __handle_mm_fault mm/memory.c:3474 [inline]
 [<ffffffff8143c588>] handle_mm_fault+0x28b8/0x3140 mm/memory.c:3503
 [<ffffffff810aaa4e>] __do_page_fault+0x28e/0x7f0 arch/x86/mm/fault.c:1243
 [<ffffffff810ab008>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1306
 [<ffffffff82719e35>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:1064
Code: 00 00 00 ea ff ff 49 21 d5 49 c1 e5 06 49 01 c5 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 db 00 00 00 <49> 8b 45 00 a8 01 0f 84 a9 00 00 00 e8 25 04 e8 ff 49 8d 5d 1c 
RIP  [<ffffffff814891ba>] constant_test_bit arch/x86/include/asm/bitops.h:311 [inline]
RIP  [<ffffffff814891ba>] PageLocked include/linux/page-flags.h:209 [inline]
RIP  [<ffffffff814891ba>] migration_entry_to_page include/linux/swapops.h:129 [inline]
RIP  [<ffffffff814891ba>] __migration_entry_wait+0xea/0x1e0 mm/migrate.c:221
 RSP <ffff8801c3737ce8>
CR2: ffffea000fd7aa40
---[ end trace 02d36a80d7331cfc ]---