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usb 1-1: USB disconnect, device number 20 ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:902 [inline] BUG: KASAN: use-after-free in enqueue_timer+0xae/0x480 kernel/time/timer.c:588 Write of size 8 at addr ffff88811ef5c8e0 by task kworker/1:2/60 CPU: 1 PID: 60 Comm: kworker/1:2 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:314 hlist_add_head include/linux/list.h:902 [inline] enqueue_timer+0xae/0x480 kernel/time/timer.c:588 __mod_timer+0x79f/0xb30 kernel/time/timer.c:-1 schedule_timeout+0x127/0x2e0 kernel/time/timer.c:1919 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common+0x26b/0x420 kernel/sched/completion.c:117 wait_for_completion_timeout+0xe/0x10 kernel/sched/completion.c:157 usb_start_wait_urb+0x166/0x2f0 drivers/usb/core/message.c:63 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x241/0x3f0 drivers/usb/core/message.c:153 get_port_status drivers/usb/core/hub.c:597 [inline] hub_ext_port_status+0x100/0x6b0 drivers/usb/core/hub.c:614 hub_port_status drivers/usb/core/hub.c:636 [inline] hub_port_debounce+0x53/0x250 drivers/usb/core/hub.c:4685 hub_port_debounce_be_stable drivers/usb/core/hub.h:173 [inline] hub_port_connect drivers/usb/core/hub.c:5406 [inline] hub_port_connect_change drivers/usb/core/hub.c:5695 [inline] port_event drivers/usb/core/hub.c:5861 [inline] hub_event+0x1b1d/0x4480 drivers/usb/core/hub.c:5943 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> Allocated by task 10817: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] hci_alloc_dev_priv+0x27/0x1ba0 net/bluetooth/hci_core.c:3775 hci_alloc_dev include/net/bluetooth/hci_core.h:1257 [inline] hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:638 [inline] hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:716 [inline] hci_uart_tty_ioctl+0x40c/0xa70 drivers/bluetooth/hci_ldisc.c:772 tty_ioctl+0x8dc/0xc60 drivers/tty/tty_io.c:2819 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:860 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 10814: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 hci_release_dev+0x1364/0x14b0 net/bluetooth/hci_core.c:4094 bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:85 device_release+0x96/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:713 [inline] kobject_release lib/kobject.c:744 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x18a/0x270 lib/kobject.c:761 put_device+0x1f/0x30 drivers/base/core.c:3530 hci_free_dev+0x1c/0x20 net/bluetooth/hci_core.c:3895 hci_uart_tty_close+0x1a3/0x220 drivers/bluetooth/hci_ldisc.c:552 tty_ldisc_close drivers/tty/tty_ldisc.c:474 [inline] tty_ldisc_kill+0x101/0x1e0 drivers/tty/tty_ldisc.c:629 tty_ldisc_release+0x1a5/0x200 drivers/tty/tty_ldisc.c:803 tty_release_struct+0x29/0xe0 drivers/tty/tty_io.c:1708 tty_release+0xcad/0x1320 drivers/tty/tty_io.c:1880 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e5/0xc60 kernel/workqueue.c:1539 queue_work_on+0xd2/0x140 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] hci_cmd_timeout+0x183/0x1f0 net/bluetooth/hci_core.c:2788 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e5/0xc60 kernel/workqueue.c:1539 delayed_work_timer_fn+0x61/0x80 kernel/workqueue.c:1664 call_timer_fn+0x38/0x290 kernel/time/timer.c:1457 expire_timers kernel/time/timer.c:1497 [inline] __run_timers+0x667/0x9a0 kernel/time/timer.c:1773 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1786 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq kernel/softirq.c:621 [inline] invoke_softirq kernel/softirq.c:443 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 The buggy address belongs to the object at ffff88811ef5c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2272 bytes inside of 8192-byte region [ffff88811ef5c000, ffff88811ef5e000) The buggy address belongs to the page: page:ffffea00047bd600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811ef58000 pfn:0x11ef58 head:ffffea00047bd600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004704208 ffffea000456f208 ffff888100043500 raw: ffff88811ef58000 0000000000020001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7737, ts 364249727901, free_ts 363979525887 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc+0x16a/0x2c0 mm/slub.c:4432 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_node include/linux/slab.h:642 [inline] alloc_callchain_buffers kernel/events/callchain.c:90 [inline] get_callchain_buffers+0x15b/0x370 kernel/events/callchain.c:134 check_helper_call+0x47d4/0x5530 kernel/bpf/verifier.c:6768 do_check+0x6108/0xea60 kernel/bpf/verifier.c:11405 do_check_common+0xff5/0x19a0 kernel/bpf/verifier.c:13478 do_check_main kernel/bpf/verifier.c:13541 [inline] bpf_check+0x32a0/0xf280 kernel/bpf/verifier.c:14112 bpf_prog_load+0x1042/0x1550 kernel/bpf/syscall.c:2328 __sys_bpf+0x4c3/0x730 kernel/bpf/syscall.c:4633 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5884 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] free_partial mm/slub.c:4305 [inline] __kmem_cache_shutdown+0x435/0x490 mm/slub.c:4330 shutdown_cache mm/slab_common.c:466 [inline] kmem_cache_destroy+0x50/0x140 mm/slab_common.c:512 p9_client_destroy+0x3a9/0x3f0 net/9p/client.c:1110 v9fs_session_close+0x4e/0x1c0 fs/9p/v9fs.c:501 v9fs_kill_super+0x5c/0x90 fs/9p/vfs_super.c:226 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x446/0x500 fs/namespace.c:1148 __cleanup_mnt+0x19/0x20 fs/namespace.c:1155 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 Memory state around the buggy address: ffff88811ef5c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811ef5c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811ef5c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811ef5c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811ef5c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/11/01 08:52 | android13-5.15-lts | 1edb21e89ce4 | 2c50b6a9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-android-5-15 | KASAN: use-after-free Write in enqueue_timer |