operation not supported error, dev loop0, sector 0 op 0x9:(WRITE_ZEROES) flags 0x10000800 phys_seg 0 prio class 0 ================================================================== BUG: KASAN: slab-use-after-free in update_io_ticks+0xa6/0x2d0 block/blk-core.c:996 Read of size 8 at addr ffff8880177c5c28 by task kworker/u4:0/11 CPU: 0 UID: 0 PID: 11 Comm: kworker/u4:0 Not tainted 6.11.0-rc5-syzkaller-00069-ga18093afa393 #0 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_rootcg_workfn Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 update_io_ticks+0xa6/0x2d0 block/blk-core.c:996 blk_account_io_done+0x207/0x7d0 block/blk-mq.c:992 __blk_mq_end_request_acct block/blk-mq.c:1031 [inline] __blk_mq_end_request+0x2bc/0x620 block/blk-mq.c:1037 loop_handle_cmd drivers/block/loop.c:1927 [inline] loop_process_work+0x1c16/0x2180 drivers/block/loop.c:1945 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5111: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4056 bdev_alloc_inode+0x28/0x60 block/bdev.c:322 alloc_inode fs/inode.c:263 [inline] new_inode_pseudo fs/inode.c:1073 [inline] new_inode+0x6e/0x310 fs/inode.c:1092 bdev_alloc+0x26/0x380 block/bdev.c:413 add_partition+0x1bb/0x890 block/partitions/core.c:321 blk_add_partition block/partitions/core.c:556 [inline] blk_add_partitions block/partitions/core.c:623 [inline] bdev_disk_changed+0xb21/0x13d0 block/partitions/core.c:683 loop_reread_partitions drivers/block/loop.c:534 [inline] loop_set_status+0x70d/0x900 drivers/block/loop.c:1303 lo_ioctl+0xcc2/0x1f60 blkdev_ioctl+0x580/0x6b0 block/ioctl.c:676 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 16: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3106 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210 destroy_inode fs/inode.c:318 [inline] evict+0x88b/0x950 fs/inode.c:729 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 blkdev_release+0x15/0x20 block/fops.c:638 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880177c5c00 which belongs to the cache bdev_cache of size 2784 The buggy address is located 40 bytes inside of freed 2784-byte region [ffff8880177c5c00, ffff8880177c66e0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x177c0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888016374280 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800b000b 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888016374280 dead000000000122 0000000000000000 head: 0000000000000000 00000000800b000b 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea00005df001 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 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_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 1, tgid 1 (swapper/0), ts 11775558956, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4056 bdev_alloc_inode+0x28/0x60 block/bdev.c:322 alloc_inode fs/inode.c:263 [inline] new_inode_pseudo fs/inode.c:1073 [inline] new_inode+0x6e/0x310 fs/inode.c:1092 bdev_alloc+0x26/0x380 block/bdev.c:413 __alloc_disk_node+0x12b/0x580 block/genhd.c:1356 __blk_mq_alloc_disk+0x24b/0x3e0 block/blk-mq.c:4202 nbd_dev_add+0x515/0xc70 drivers/block/nbd.c:1847 nbd_init+0x210/0x2c0 drivers/block/nbd.c:2583 do_one_initcall+0x248/0x880 init/main.c:1267 page_owner free stack trace missing Memory state around the buggy address: ffff8880177c5b00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8880177c5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880177c5c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880177c5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880177c5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================