================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:775 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x57/0x1f0 net/bluetooth/sco.c:89 Write of size 4 at addr ffff88817da94080 by task kworker/0:1/38 CPU: 0 PID: 38 Comm: kworker/0:1 Not tainted 6.3.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x3d/0x60 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0xc4/0x620 mm/kasan/report.c:430 kasan_report+0xdc/0x110 mm/kasan/report.c:536 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0x143/0x190 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:775 [inline] sco_sock_timeout+0x57/0x1f0 net/bluetooth/sco.c:89 process_one_work+0x850/0x1270 kernel/workqueue.c:2390 worker_thread+0xf1/0xdd0 kernel/workqueue.c:2537 kthread+0x22c/0x2b0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 2326: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc+0x5d/0x160 mm/slab_common.c:980 kmalloc include/linux/slab.h:584 [inline] sk_prot_alloc+0x14f/0x210 net/core/sock.c:2040 sk_alloc+0x30/0x580 net/core/sock.c:2093 sco_sock_alloc.constprop.0+0x22/0x2f0 net/bluetooth/sco.c:506 sco_sock_create+0xb3/0x160 net/bluetooth/sco.c:545 bt_sock_create+0x11e/0x250 net/bluetooth/af_bluetooth.c:132 __sock_create+0x1fd/0x460 net/socket.c:1545 sock_create net/socket.c:1596 [inline] __sys_socket_create net/socket.c:1633 [inline] __sys_socket+0x114/0x1b0 net/socket.c:1661 __do_sys_socket net/socket.c:1674 [inline] __se_sys_socket net/socket.c:1672 [inline] __x64_sys_socket+0x6d/0xb0 net/socket.c:1672 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 2327: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xab/0x320 mm/slub.c:3800 sk_prot_free net/core/sock.c:2076 [inline] __sk_destruct+0x4a5/0x6b0 net/core/sock.c:2168 sco_sock_release+0x130/0x280 net/bluetooth/sco.c:1275 __sock_release+0xbb/0x280 net/socket.c:653 sock_close+0x13/0x20 net/socket.c:1395 __fput+0x1e3/0x9b0 fs/file_table.c:321 task_work_run+0x114/0x1f0 kernel/task_work.c:179 get_signal+0x194/0x1f00 kernel/signal.c:2635 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0xc3/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88817da94000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88817da94000, ffff88817da94800) The buggy address belongs to the physical page: page:ffffea0005f6a400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88817da96000 pfn:0x17da90 head:ffffea0005f6a400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=2) raw: 0100000000010200 ffff888100042000 ffffea000438b210 ffffea0004239c10 raw: ffff88817da96000 0000000000080007 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 1277, tgid 1277 (klogd), ts 7386005285, free_ts 6062958026 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x281/0x2f0 mm/page_alloc.c:2546 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0xc0a/0x41a0 mm/page_alloc.c:4326 __alloc_pages+0x1d0/0x470 mm/page_alloc.c:5592 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x24e/0x360 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x7e8/0xf30 mm/slub.c:3193 __slab_alloc.constprop.0+0x4d/0x90 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x144/0x390 mm/slub.c:3491 kmalloc_trace+0x25/0xb0 mm/slab_common.c:1061 kmalloc include/linux/slab.h:580 [inline] syslog_print+0xf0/0x460 kernel/printk/printk.c:1562 do_syslog+0x212/0x3c0 kernel/printk/printk.c:1741 __do_sys_syslog kernel/printk/printk.c:1833 [inline] __se_sys_syslog kernel/printk/printk.c:1831 [inline] __x64_sys_syslog+0x6f/0xb0 kernel/printk/printk.c:1831 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1454 [inline] free_pcp_prepare+0x4de/0xa50 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page+0x1c/0x460 mm/page_alloc.c:3483 free_contig_range+0xa1/0x150 mm/page_alloc.c:9532 destroy_args+0x4fc/0x6b0 mm/debug_vm_pgtable.c:1023 debug_vm_pgtable+0x1a00/0x2d20 mm/debug_vm_pgtable.c:1403 do_one_initcall+0xcd/0x350 init/main.c:1310 do_initcall_level init/main.c:1383 [inline] do_initcalls init/main.c:1399 [inline] do_basic_setup init/main.c:1418 [inline] kernel_init_freeable+0x53c/0x890 init/main.c:1638 kernel_init+0x1a/0x1c0 init/main.c:1526 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88817da93f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88817da94000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88817da94080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88817da94100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88817da94180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================