[moderation] [block?] KASAN: slab-use-after-free Read in update_io_ticks (4)
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syzbot
Mar 7, 2026, 7:26:23 AM (23 hours ago) Mar 7
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10da18d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb
dashboard link: https://syzkaller.appspot.com/bug?extid=9eefac3fe5d5022c349e
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-af4e9ef3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/162b63d580f6/vmlinux-af4e9ef3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1a13a91475a2/bzImage-af4e9ef3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9eefac...@syzkaller.appspotmail.com
I/O error, dev loop0, sector 50 op 0x0:(READ) flags 0x800000 phys_seg 1 prio class 2
==================================================================
BUG: KASAN: slab-use-after-free in update_io_ticks+0xa9/0x280 block/blk-core.c:1028
Read of size 8 at addr ffff888031f11728 by task kworker/u4:7/1040
CPU: 0 UID: 0 PID: 1040 Comm: kworker/u4:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: loop0 loop_workfn
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
update_io_ticks+0xa9/0x280 block/blk-core.c:1028
blk_account_io_done+0x18b/0x7b0 block/blk-mq.c:1082
__blk_mq_end_request_acct block/blk-mq.c:1156 [inline]
__blk_mq_end_request+0x2ae/0x630 block/blk-mq.c:1162
lo_rw_aio_complete drivers/block/loop.c:337 [inline]
lo_rw_aio+0xcde/0xf00 drivers/block/loop.c:409
do_req_filebacked drivers/block/loop.c:435 [inline]
loop_handle_cmd drivers/block/loop.c:1925 [inline]
loop_process_work+0x958/0x11a0 drivers/block/loop.c:1960
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 4711:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4863
bdev_alloc_inode+0x29/0x90 block/bdev.c:380
alloc_inode+0x6a/0x1b0 fs/inode.c:347
new_inode+0x22/0x170 fs/inode.c:1185
bdev_alloc+0x26/0x380 block/bdev.c:477
add_partition+0x1c3/0x8e0 block/partitions/core.c:327
blk_add_partition block/partitions/core.c:565 [inline]
blk_add_partitions block/partitions/core.c:634 [inline]
bdev_disk_changed+0xbab/0x1550 block/partitions/core.c:694
blkdev_get_whole+0x380/0x510 block/bdev.c:764
bdev_open+0x31e/0xd30 block/bdev.c:973
bdev_file_open_by_dev+0x1be/0x240 block/bdev.c:1075
disk_scan_partitions+0x1c1/0x2c0 block/genhd.c:387
blkdev_common_ioctl+0x1ce4/0x3250 block/ioctl.c:719
blkdev_ioctl+0x528/0x740 block/ioctl.c:798
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6143 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6273
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3131 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
destroy_inode fs/inode.c:402 [inline]
evict+0x95b/0xb10 fs/inode.c:870
device_release+0x9e/0x1d0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x560 lib/kobject.c:737
bdev_disk_changed+0x292/0x1550 block/partitions/core.c:675
__loop_clr_fd drivers/block/loop.c:1164 [inline]
lo_release+0x547/0x840 drivers/block/loop.c:1751
bdev_release+0x536/0x650 block/bdev.c:-1
blkdev_release+0x15/0x20 block/fops.c:705
__fput+0x44f/0xa70 fs/file_table.c:469
fput_close_sync+0x11f/0x240 fs/file_table.c:574
__do_sys_close fs/open.c:1509 [inline]
__se_sys_close fs/open.c:1494 [inline]
__x64_sys_close+0x7e/0x110 fs/open.c:1494
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888031f11700
which belongs to the cache bdev_cache of size 2776
The buggy address is located 40 bytes inside of
freed 2776-byte region [ffff888031f11700, ffff888031f121d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31f10
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888044b7b281
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff888030414b40 dead000000000122 0000000000000000
raw: 0000000000000000 00000008000b000b 00000000f5000000 ffff888044b7b281
head: 04fff00000000040 ffff888030414b40 dead000000000122 0000000000000000
head: 0000000000000000 00000008000b000b 00000000f5000000 ffff888044b7b281
head: 04fff00000000003 ffffea0000c7c401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 15439559208, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3269 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3458
new_slab mm/slub.c:3516 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7153
refill_sheaf mm/slub.c:2818 [inline]
__pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4592
alloc_from_pcs mm/slub.c:4695 [inline]
slab_alloc_node mm/slub.c:4829 [inline]
kmem_cache_alloc_lru_noprof+0x37c/0x640 mm/slub.c:4863
bdev_alloc_inode+0x29/0x90 block/bdev.c:380
alloc_inode+0x6a/0x1b0 fs/inode.c:347
new_inode+0x22/0x170 fs/inode.c:1185
bdev_alloc+0x26/0x380 block/bdev.c:477
__alloc_disk_node+0x11d/0x5b0 block/genhd.c:1465
__blk_alloc_disk+0x105/0x1d0 block/genhd.c:1519
pmem_attach_disk+0x4d1/0xe10 drivers/nvdimm/pmem.c:509
nvdimm_bus_probe+0x331/0x6c0 drivers/nvdimm/bus.c:91
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
page_owner free stack trace missing
Memory state around the buggy address:
ffff888031f11600: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff888031f11680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888031f11700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888031f11780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888031f11800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10da18d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb
dashboard link: https://syzkaller.appspot.com/bug?extid=9eefac3fe5d5022c349e
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-af4e9ef3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/162b63d580f6/vmlinux-af4e9ef3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1a13a91475a2/bzImage-af4e9ef3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9eefac...@syzkaller.appspotmail.com
I/O error, dev loop0, sector 50 op 0x0:(READ) flags 0x800000 phys_seg 1 prio class 2
==================================================================
BUG: KASAN: slab-use-after-free in update_io_ticks+0xa9/0x280 block/blk-core.c:1028
Read of size 8 at addr ffff888031f11728 by task kworker/u4:7/1040
CPU: 0 UID: 0 PID: 1040 Comm: kworker/u4:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: loop0 loop_workfn
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
update_io_ticks+0xa9/0x280 block/blk-core.c:1028
blk_account_io_done+0x18b/0x7b0 block/blk-mq.c:1082
__blk_mq_end_request_acct block/blk-mq.c:1156 [inline]
__blk_mq_end_request+0x2ae/0x630 block/blk-mq.c:1162
lo_rw_aio_complete drivers/block/loop.c:337 [inline]
lo_rw_aio+0xcde/0xf00 drivers/block/loop.c:409
do_req_filebacked drivers/block/loop.c:435 [inline]
loop_handle_cmd drivers/block/loop.c:1925 [inline]
loop_process_work+0x958/0x11a0 drivers/block/loop.c:1960
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 4711:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4863
bdev_alloc_inode+0x29/0x90 block/bdev.c:380
alloc_inode+0x6a/0x1b0 fs/inode.c:347
new_inode+0x22/0x170 fs/inode.c:1185
bdev_alloc+0x26/0x380 block/bdev.c:477
add_partition+0x1c3/0x8e0 block/partitions/core.c:327
blk_add_partition block/partitions/core.c:565 [inline]
blk_add_partitions block/partitions/core.c:634 [inline]
bdev_disk_changed+0xbab/0x1550 block/partitions/core.c:694
blkdev_get_whole+0x380/0x510 block/bdev.c:764
bdev_open+0x31e/0xd30 block/bdev.c:973
bdev_file_open_by_dev+0x1be/0x240 block/bdev.c:1075
disk_scan_partitions+0x1c1/0x2c0 block/genhd.c:387
blkdev_common_ioctl+0x1ce4/0x3250 block/ioctl.c:719
blkdev_ioctl+0x528/0x740 block/ioctl.c:798
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6143 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6273
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3131 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
destroy_inode fs/inode.c:402 [inline]
evict+0x95b/0xb10 fs/inode.c:870
device_release+0x9e/0x1d0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x560 lib/kobject.c:737
bdev_disk_changed+0x292/0x1550 block/partitions/core.c:675
__loop_clr_fd drivers/block/loop.c:1164 [inline]
lo_release+0x547/0x840 drivers/block/loop.c:1751
bdev_release+0x536/0x650 block/bdev.c:-1
blkdev_release+0x15/0x20 block/fops.c:705
__fput+0x44f/0xa70 fs/file_table.c:469
fput_close_sync+0x11f/0x240 fs/file_table.c:574
__do_sys_close fs/open.c:1509 [inline]
__se_sys_close fs/open.c:1494 [inline]
__x64_sys_close+0x7e/0x110 fs/open.c:1494
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888031f11700
which belongs to the cache bdev_cache of size 2776
The buggy address is located 40 bytes inside of
freed 2776-byte region [ffff888031f11700, ffff888031f121d8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31f10
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888044b7b281
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff888030414b40 dead000000000122 0000000000000000
raw: 0000000000000000 00000008000b000b 00000000f5000000 ffff888044b7b281
head: 04fff00000000040 ffff888030414b40 dead000000000122 0000000000000000
head: 0000000000000000 00000008000b000b 00000000f5000000 ffff888044b7b281
head: 04fff00000000003 ffffea0000c7c401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 15439559208, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3269 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3458
new_slab mm/slub.c:3516 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7153
refill_sheaf mm/slub.c:2818 [inline]
__pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4592
alloc_from_pcs mm/slub.c:4695 [inline]
slab_alloc_node mm/slub.c:4829 [inline]
kmem_cache_alloc_lru_noprof+0x37c/0x640 mm/slub.c:4863
bdev_alloc_inode+0x29/0x90 block/bdev.c:380
alloc_inode+0x6a/0x1b0 fs/inode.c:347
new_inode+0x22/0x170 fs/inode.c:1185
bdev_alloc+0x26/0x380 block/bdev.c:477
__alloc_disk_node+0x11d/0x5b0 block/genhd.c:1465
__blk_alloc_disk+0x105/0x1d0 block/genhd.c:1519
pmem_attach_disk+0x4d1/0xe10 drivers/nvdimm/pmem.c:509
nvdimm_bus_probe+0x331/0x6c0 drivers/nvdimm/bus.c:91
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
page_owner free stack trace missing
Memory state around the buggy address:
ffff888031f11600: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff888031f11680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888031f11700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888031f11780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888031f11800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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