I/O error, dev loop0, sector 2424 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 ================================================================== BUG: KASAN: slab-use-after-free in update_io_ticks+0x9a/0x260 block/blk-core.c:1018 Read of size 8 at addr ffff88803215e7a8 by task kworker/u4:11/3027 CPU: 0 UID: 0 PID: 3027 Comm: kworker/u4:11 Not tainted 6.16.0-syzkaller-12250-gc30a13538d9f #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: loop0 loop_workfn Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 update_io_ticks+0x9a/0x260 block/blk-core.c:1018 blk_account_io_done+0x19b/0x780 block/blk-mq.c:1055 __blk_mq_end_request_acct block/blk-mq.c:1129 [inline] __blk_mq_end_request+0x2af/0x600 block/blk-mq.c:1135 lo_rw_aio_complete drivers/block/loop.c:327 [inline] lo_rw_aio+0xd75/0xfa0 drivers/block/loop.c:401 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1910 [inline] loop_process_work+0x835/0xf90 drivers/block/loop.c:1945 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5362: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_lru_noprof+0x1c6/0x3d0 mm/slub.c:4248 bdev_alloc_inode+0x29/0x90 block/bdev.c:364 alloc_inode+0x67/0x1b0 fs/inode.c:346 new_inode+0x22/0x170 fs/inode.c:1145 bdev_alloc+0x26/0x380 block/bdev.c:461 add_partition+0x1c3/0x8e0 block/partitions/core.c:326 blk_add_partition block/partitions/core.c:564 [inline] blk_add_partitions block/partitions/core.c:633 [inline] bdev_disk_changed+0xb50/0x14b0 block/partitions/core.c:693 loop_reread_partitions drivers/block/loop.c:439 [inline] loop_set_status+0x85a/0xb40 drivers/block/loop.c:1265 lo_ioctl+0x9af/0x1d00 drivers/block/loop.c:-1 blkdev_ioctl+0x5a8/0x6d0 block/ioctl.c:705 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 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:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4782 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x283/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 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:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243 destroy_inode fs/inode.c:401 [inline] evict+0x847/0x9c0 fs/inode.c:834 device_release+0x99/0x1c0 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+0x22b/0x480 lib/kobject.c:737 blkdev_release+0x15/0x20 block/fops.c:699 __fput+0x449/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803215e780 which belongs to the cache bdev_cache of size 2792 The buggy address is located 40 bytes inside of freed 2792-byte region [ffff88803215e780, ffff88803215f268) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32158 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888052e26701 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801bed7280 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800b000b 00000000f5000000 ffff888052e26701 head: 04fff00000000040 ffff88801bed7280 dead000000000122 0000000000000000 head: 0000000000000000 00000000800b000b 00000000f5000000 ffff888052e26701 head: 04fff00000000003 ffffea0000c85601 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 11814848371, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] kmem_cache_alloc_lru_noprof+0x288/0x3d0 mm/slub.c:4248 bdev_alloc_inode+0x29/0x90 block/bdev.c:364 alloc_inode+0x67/0x1b0 fs/inode.c:346 new_inode+0x22/0x170 fs/inode.c:1145 bdev_alloc+0x26/0x380 block/bdev.c:461 __alloc_disk_node+0x11c/0x540 block/genhd.c:1464 __blk_mq_alloc_disk+0x196/0x340 block/blk-mq.c:4451 nbd_dev_add+0x46c/0xae0 drivers/block/nbd.c:1943 nbd_init+0x168/0x1f0 drivers/block/nbd.c:2680 do_one_initcall+0x233/0x820 init/main.c:1269 page_owner free stack trace missing Memory state around the buggy address: ffff88803215e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88803215e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803215e780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803215e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803215e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================