================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x2f/0x120 lib/list_debug.c:46 Read of size 8 at addr ffff8881256df208 by task kworker/0:8/499 CPU: 0 PID: 499 Comm: kworker/0:8 Not tainted 5.10.227-syzkaller-00554-g550d1177dc67 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events binder_deferred_func Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 __list_del_entry_valid+0x2f/0x120 lib/list_debug.c:46 __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] binder_dequeue_work_head_ilocked drivers/android/binder.c:515 [inline] binder_release_work+0xcd/0x680 drivers/android/binder.c:5126 binder_deferred_release drivers/android/binder.c:6278 [inline] binder_deferred_func+0x1847/0x1bc0 drivers/android/binder.c:6313 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 1914: 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:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] binder_request_freeze_notification drivers/android/binder.c:3867 [inline] binder_thread_write+0x9ce/0x6c70 drivers/android/binder.c:4495 binder_ioctl_write_read+0x216/0x6a80 drivers/android/binder.c:5411 binder_ioctl+0x314/0x1e00 drivers/android/binder.c:5727 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 499: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 binder_free_ref+0x128/0x260 drivers/android/binder.c:1453 binder_deferred_release drivers/android/binder.c:6273 [inline] binder_deferred_func+0x171c/0x1bc0 drivers/android/binder.c:6313 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff8881256df200 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of 64-byte region [ffff8881256df200, ffff8881256df240) The buggy address belongs to the page: page:ffffea000495b7c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1256df flags: 0x4000000000000200(slab) raw: 4000000000000200 ffffea000440e880 0000000b0000000b ffff888100043800 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x116cc0(GFP_USER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY), pid 284, ts 44557044579, free_ts 44547833453 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc+0x204/0x330 mm/slub.c:4029 kmalloc include/linux/slab.h:557 [inline] inotify_handle_inode_event+0x17f/0x4d0 fs/notify/inotify/inotify_fsnotify.c:95 fsnotify_handle_inode_event fs/notify/fsnotify.c:274 [inline] fsnotify_handle_event fs/notify/fsnotify.c:321 [inline] send_to_group fs/notify/fsnotify.c:375 [inline] fsnotify+0x1a6a/0x20f0 fs/notify/fsnotify.c:552 __fsnotify_parent+0x465/0x6c0 fs/notify/fsnotify.c:243 fsnotify_parent include/linux/fsnotify.h:68 [inline] fsnotify_file include/linux/fsnotify.h:118 [inline] fsnotify_close include/linux/fsnotify.h:343 [inline] __fput+0x23e/0x7b0 fs/file_table.c:267 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page+0x9e/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 free_pages+0x7c/0x90 mm/page_alloc.c:5429 _pgd_free arch/x86/mm/pgtable.c:420 [inline] pgd_free+0x17d/0x190 arch/x86/mm/pgtable.c:476 mm_free_pgd kernel/fork.c:675 [inline] __mmdrop+0xb0/0x490 kernel/fork.c:726 mmdrop include/linux/sched/mm.h:49 [inline] finish_task_switch+0x1e6/0x5a0 kernel/sched/core.c:3903 context_switch kernel/sched/core.c:4049 [inline] __schedule+0xbee/0x1330 kernel/sched/core.c:4804 schedule+0x13d/0x1d0 kernel/sched/core.c:4882 schedule_hrtimeout_range_clock+0x228/0x370 kernel/time/hrtimer.c:2214 schedule_hrtimeout_range+0x2a/0x40 kernel/time/hrtimer.c:2261 poll_schedule_timeout fs/select.c:243 [inline] do_select+0x143e/0x16c0 fs/select.c:606 core_sys_select+0x572/0x6e0 fs/select.c:680 do_pselect fs/select.c:762 [inline] __do_sys_pselect6 fs/select.c:803 [inline] __se_sys_pselect6+0x322/0x3f0 fs/select.c:794 __x64_sys_pselect6+0xe5/0x100 fs/select.c:794 do_syscall_64+0x34/0x70 Memory state around the buggy address: ffff8881256df100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881256df180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881256df200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8881256df280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881256df300: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc ================================================================== general protection fault, probably for non-canonical address 0xf207fc3e2000003e: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x904001f1000001f0-0x904001f1000001f7] CPU: 0 PID: 499 Comm: kworker/0:8 Tainted: G B 5.10.227-syzkaller-00554-g550d1177dc67 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events binder_deferred_func RIP: 0010:__list_del_entry_valid+0x75/0x120 lib/list_debug.c:59 Code: 1e 48 85 db 74 68 4d 85 ff 74 74 48 ba 00 01 00 00 00 00 ad de 48 39 d3 74 76 48 83 c2 22 49 39 d7 74 7e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 ac 90 51 ff 49 8b 17 4c 39 f2 75 RSP: 0018:ffffc90000dd7c20 EFLAGS: 00010a02 RAX: 1208003e2000003e RBX: ffff88810c092c00 RCX: ffffffff8256c799 RDX: dead000000000122 RSI: 0000000000000286 RDI: ffff8881256df200 RBP: ffffc90000dd7c40 R08: ffffffff813e2a3b R09: 0000000000000003 R10: fffffbfff0e11248 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881256df200 R14: ffff8881256df200 R15: 904001f1000001f3 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000012424b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] binder_dequeue_work_head_ilocked drivers/android/binder.c:515 [inline] binder_release_work+0xcd/0x680 drivers/android/binder.c:5126 binder_deferred_release drivers/android/binder.c:6278 [inline] binder_deferred_func+0x1847/0x1bc0 drivers/android/binder.c:6313 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace d75a0d3fd71dc508 ]--- RIP: 0010:__list_del_entry_valid+0x75/0x120 lib/list_debug.c:59 Code: 1e 48 85 db 74 68 4d 85 ff 74 74 48 ba 00 01 00 00 00 00 ad de 48 39 d3 74 76 48 83 c2 22 49 39 d7 74 7e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 ac 90 51 ff 49 8b 17 4c 39 f2 75 RSP: 0018:ffffc90000dd7c20 EFLAGS: 00010a02 RAX: 1208003e2000003e RBX: ffff88810c092c00 RCX: ffffffff8256c799 RDX: dead000000000122 RSI: 0000000000000286 RDI: ffff8881256df200 RBP: ffffc90000dd7c40 R08: ffffffff813e2a3b R09: 0000000000000003 R10: fffffbfff0e11248 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881256df200 R14: ffff8881256df200 R15: 904001f1000001f3 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000012424b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 85 db test %rbx,%rbx 3: 74 68 je 0x6d 5: 4d 85 ff test %r15,%r15 8: 74 74 je 0x7e a: 48 ba 00 01 00 00 00 movabs $0xdead000000000100,%rdx 11: 00 ad de 14: 48 39 d3 cmp %rdx,%rbx 17: 74 76 je 0x8f 19: 48 83 c2 22 add $0x22,%rdx 1d: 49 39 d7 cmp %rdx,%r15 20: 74 7e je 0xa0 22: 4c 89 f8 mov %r15,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 ac 90 51 ff call 0xff5190e4 38: 49 8b 17 mov (%r15),%rdx 3b: 4c 39 f2 cmp %r14,%rdx 3e: 75 .byte 0x75