================================================================== BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005 Read of size 8 at addr ffff88801fe0ffa8 by task kworker/u8:6/2422 CPU: 1 PID: 2422 Comm: kworker/u8:6 Not tainted 6.9.0-rc2-next-20240403-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: writeback wb_workfn (flush-7:2) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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 __lock_acquire+0x78/0x1fd0 kernel/locking/lockdep.c:5005 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] wb_writeback+0x66f/0xd30 fs/fs-writeback.c:2160 wb_do_writeback fs/fs-writeback.c:2274 [inline] wb_workfn+0x410/0x1090 fs/fs-writeback.c:2314 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 1: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_node_trace_noprof+0x1d3/0x300 mm/slub.c:4112 kmalloc_node_noprof include/linux/slab.h:677 [inline] sbitmap_queue_init_node+0x1ca/0x4c0 lib/sbitmap.c:428 bt_alloc block/blk-mq-tag.c:542 [inline] blk_mq_init_bitmaps block/blk-mq-tag.c:554 [inline] blk_mq_init_tags+0x109/0x270 block/blk-mq-tag.c:585 blk_mq_alloc_rq_map block/blk-mq.c:3352 [inline] blk_mq_alloc_map_and_rqs+0xc5/0x970 block/blk-mq.c:3820 __blk_mq_alloc_map_and_rqs block/blk-mq.c:3842 [inline] __blk_mq_alloc_rq_maps block/blk-mq.c:4352 [inline] blk_mq_alloc_set_map_and_rqs+0x19c/0x830 block/blk-mq.c:4383 blk_mq_alloc_tag_set+0x7b4/0xf40 block/blk-mq.c:4555 loop_add+0x40e/0xba0 drivers/block/loop.c:2028 loop_init+0x17a/0x230 drivers/block/loop.c:2275 do_one_initcall+0x248/0x880 init/main.c:1258 do_initcall_level+0x157/0x210 init/main.c:1320 do_initcalls+0x3f/0x80 init/main.c:1336 kernel_init_freeable+0x435/0x5d0 init/main.c:1569 kernel_init+0x1d/0x2b0 init/main.c:1458 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 The buggy address belongs to the object at ffff88801fe0f800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 936 bytes to the right of allocated 1024-byte region [ffff88801fe0f800, ffff88801fe0fc00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fe08 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000040(head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000040 ffff888015041dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff80000000040 ffff888015041dc0 dead000000000122 0000000000000000 head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff80000000003 ffffea00007f8201 ffffea00007f8248 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 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, tgid -1414704850 (swapper/0), ts 1, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3615 __slab_alloc+0x58/0xa0 mm/slub.c:3705 __slab_alloc_node mm/slub.c:3758 [inline] slab_alloc_node mm/slub.c:3936 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4095 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] loop_add+0xde/0xba0 drivers/block/loop.c:1994 loop_init+0x17a/0x230 drivers/block/loop.c:2275 do_one_initcall+0x248/0x880 init/main.c:1258 do_initcall_level+0x157/0x210 init/main.c:1320 do_initcalls+0x3f/0x80 init/main.c:1336 kernel_init_freeable+0x435/0x5d0 init/main.c:1569 kernel_init+0x1d/0x2b0 init/main.c:1458 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 page_owner free stack trace missing Memory state around the buggy address: ffff88801fe0fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fe0ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801fe0ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801fe10000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fe10080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================