==================================================================
BUG: KASAN: use-after-free in wb_put_many include/linux/backing-dev-defs.h:250 [inline]
BUG: KASAN: use-after-free in wb_put include/linux/backing-dev-defs.h:268 [inline]
BUG: KASAN: use-after-free in inode_detach_wb include/linux/writeback.h:251 [inline]
BUG: KASAN: use-after-free in bdev_evict_inode+0x3c3/0x410 fs/block_dev.c:834
Read of size 8 at addr ffff888146534060 by task syz-executor.0/16232
CPU: 1 PID: 16232 Comm: syz-executor.0 Not tainted 5.14.0-rc5-next-20210816-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
wb_put_many include/linux/backing-dev-defs.h:250 [inline]
wb_put include/linux/backing-dev-defs.h:268 [inline]
inode_detach_wb include/linux/writeback.h:251 [inline]
bdev_evict_inode+0x3c3/0x410 fs/block_dev.c:834
evict+0x2ed/0x6b0 fs/inode.c:590
iput_final fs/inode.c:1670 [inline]
iput.part.0+0x539/0x850 fs/inode.c:1696
iput+0x58/0x70 fs/inode.c:1686
device_release+0x9f/0x240 drivers/base/core.c:2195
kobject_cleanup lib/kobject.c:705 [inline]
kobject_release lib/kobject.c:736 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c8/0x540 lib/kobject.c:753
put_device+0x1b/0x30 drivers/base/core.c:3466
put_disk block/genhd.c:1336 [inline]
blk_cleanup_disk+0x6b/0x80 block/genhd.c:1352
loop_remove drivers/block/loop.c:2415 [inline]
loop_control_remove drivers/block/loop.c:2463 [inline]
loop_control_ioctl+0x3db/0x450 drivers/block/loop.c:2495
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f381487c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffec4c45aef R14: 00007f381487c300 R15: 0000000000022000
Allocated by task 1:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
bdi_alloc+0x43/0x180 mm/backing-dev.c:810
__alloc_disk_node+0x6e/0x500 block/genhd.c:1268
__blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3147
loop_add+0x324/0x940 drivers/block/loop.c:2344
loop_init+0x1f4/0x216 drivers/block/loop.c:2575
do_one_initcall+0x103/0x650 init/main.c:1292
do_initcall_level init/main.c:1367 [inline]
do_initcalls init/main.c:1383 [inline]
do_basic_setup init/main.c:1402 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1604
kernel_init+0x1a/0x1d0 init/main.c:1496
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Freed by task 16232:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1681 [inline]
slab_free_freelist_hook+0x7e/0x190 mm/slub.c:1706
slab_free mm/slub.c:3450 [inline]
kfree+0xe4/0x530 mm/slub.c:4510
kref_put include/linux/kref.h:65 [inline]
bdi_put+0x72/0xa0 mm/backing-dev.c:976
disk_release+0x7b/0x270 block/genhd.c:1087
device_release+0x9f/0x240 drivers/base/core.c:2195
kobject_cleanup lib/kobject.c:705 [inline]
kobject_release lib/kobject.c:736 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c8/0x540 lib/kobject.c:753
put_device+0x1b/0x30 drivers/base/core.c:3466
put_disk block/genhd.c:1336 [inline]
blk_cleanup_disk+0x6b/0x80 block/genhd.c:1352
loop_remove drivers/block/loop.c:2415 [inline]
loop_control_remove drivers/block/loop.c:2463 [inline]
loop_control_ioctl+0x3db/0x450 drivers/block/loop.c:2495
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348
insert_work+0x48/0x370 kernel/workqueue.c:1332
__queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
__queue_delayed_work+0x1c8/0x270 kernel/workqueue.c:1645
mod_delayed_work_on+0xdd/0x220 kernel/workqueue.c:1719
mod_delayed_work include/linux/workqueue.h:537 [inline]
wb_shutdown+0x178/0x230 mm/backing-dev.c:360
bdi_unregister+0x180/0x5a0 mm/backing-dev.c:947
del_gendisk+0x57e/0x6f0 block/genhd.c:614
loop_remove drivers/block/loop.c:2414 [inline]
loop_control_remove drivers/block/loop.c:2463 [inline]
loop_control_ioctl+0x3b5/0x450 drivers/block/loop.c:2495
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Second to last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348
insert_work+0x48/0x370 kernel/workqueue.c:1332
__queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1461 [inline]
__run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
The buggy address belongs to the object at ffff888146534000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 96 bytes inside of
4096-byte region [ffff888146534000, ffff888146535000)
The buggy address belongs to the page:
page:ffffea0005194c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x146530
head:ffffea0005194c00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 dead000000000100 dead000000000122 ffff888010c42140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 7566764109, free_ts 0
prep_new_page mm/page_alloc.c:2424 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4151
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5373
alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2033
alloc_pages+0x29f/0x300 mm/mempolicy.c:2183
alloc_slab_page mm/slub.c:1744 [inline]
allocate_slab mm/slub.c:1881 [inline]
new_slab+0x319/0x490 mm/slub.c:1944
___slab_alloc+0x8b9/0xf50 mm/slub.c:2961
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3048
slab_alloc_node mm/slub.c:3139 [inline]
slab_alloc mm/slub.c:3181 [inline]
kmem_cache_alloc_trace+0x305/0x3c0 mm/slub.c:3198
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_uevent_env+0x240/0x1650 lib/kobject_uevent.c:524
disk_uevent+0x124/0x480 block/genhd.c:391
register_disk block/genhd.c:468 [inline]
device_add_disk+0x940/0xcd0 block/genhd.c:551
add_disk include/linux/genhd.h:222 [inline]
brd_alloc+0x484/0x6b0 drivers/block/brd.c:413
brd_init+0x16f/0x276 drivers/block/brd.c:496
do_one_initcall+0x103/0x650 init/main.c:1292
do_initcall_level init/main.c:1367 [inline]
do_initcalls init/main.c:1383 [inline]
do_basic_setup init/main.c:1402 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1604
kernel_init+0x1a/0x1d0 init/main.c:1496
page_owner free stack trace missing
Memory state around the buggy address:
ffff888146533f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888146533f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888146534000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888146534080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888146534100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: ff c3 inc %ebx
2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
9: 00 00 00
c: 0f 1f 40 00 nopl 0x0(%rax)
10: 48 89 f8 mov %rdi,%rax
13: 48 89 f7 mov %rsi,%rdi
16: 48 89 d6 mov %rdx,%rsi
19: 48 89 ca mov %rcx,%rdx
1c: 4d 89 c2 mov %r8,%r10
1f: 4d 89 c8 mov %r9,%r8
22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
27: 0f 05 syscall
29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
2f: 73 01 jae 0x32
31: c3 retq
32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx
39: f7 d8 neg %eax
3b: 64 89 01 mov %eax,%fs:(%rcx)
3e: 48 rex.W