================================================================== BUG: KASAN: double-free in slab_free mm/slub.c:3534 [inline] BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4562 CPU: 0 PID: 4143 Comm: syz-executor.0 Not tainted 6.0.0-rc6-syzkaller-00046-gaa1df3a360a0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462 ____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xe2/0x580 mm/slub.c:4562 io_clean_op+0x581/0xb10 io_uring/io_uring.c:1706 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1312 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1350 io_submit_flush_completions io_uring/io_uring.c:171 [inline] ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1010 tctx_task_work+0x153/0x420 io_uring/io_uring.c:1094 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 get_signal+0x1c3/0x2610 kernel/signal.c:2634 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f25f668a669 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f25f7743168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 00000000000040b2 RBX: 00007f25f67abf80 RCX: 00007f25f668a669 RDX: 0000000000000000 RSI: 00000000000040b2 RDI: 0000000000000003 RBP: 00007f25f66e5560 R08: 0000000020000000 R09: 0000000000000008 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca833dfcf R14: 00007f25f7743300 R15: 0000000000022000 Allocated by task 4143: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:605 [inline] io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1597 io_msg_alloc_async io_uring/net.c:138 [inline] io_msg_alloc_async_prep io_uring/net.c:147 [inline] io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1620 io_submit_sqe io_uring/io_uring.c:2144 [inline] io_submit_sqes+0xf69/0x1d10 io_uring/io_uring.c:2283 __do_sys_io_uring_enter+0xac6/0x2380 io_uring/io_uring.c:3224 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4143: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xe2/0x580 mm/slub.c:4562 io_send_zc_cleanup+0x141/0x190 io_uring/net.c:916 io_clean_op+0xf4/0xb10 io_uring/io_uring.c:1691 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1312 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1350 io_submit_flush_completions io_uring/io_uring.c:171 [inline] ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1010 tctx_task_work+0x153/0x420 io_uring/io_uring.c:1094 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 get_signal+0x1c3/0x2610 kernel/signal.c:2634 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888016865800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff888016865800, ffff888016865a00) The buggy address belongs to the physical page: page:ffffea00005a1900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16864 head:ffffea00005a1900 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011841c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2968, tgid 2968 (udevd), ts 80588086489, free_ts 78568556659 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2f2/0x380 mm/slub.c:4955 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1257 [inline] alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:409 [inline] kobject_uevent_env+0xc2e/0x1640 lib/kobject_uevent.c:593 kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208 uevent_store+0x20/0x50 drivers/base/core.c:2509 dev_attr_store+0x50/0x80 drivers/base/core.c:2211 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x3f8/0x610 fs/kernfs/file.c:354 call_write_iter include/linux/fs.h:2189 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3293 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:422 alloc_skb include/linux/skbuff.h:1257 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] __vhci_create_device+0x83/0x7d0 drivers/bluetooth/hci_vhci.c:300 vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline] vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:531 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff888016865700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888016865780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888016865800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888016865880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888016865900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================