================================================================== BUG: KASAN: use-after-free in task_work_run+0x1b4/0x270 kernel/task_work.c:178 Read of size 8 at addr ffff88805b0e9c18 by task syz-executor.1/24097 CPU: 0 PID: 24097 Comm: syz-executor.1 Not tainted 6.1.0-rc4-syzkaller-01120-gee748cd95e3a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 task_work_run+0x1b4/0x270 kernel/task_work.c:178 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb3d/0x2a30 kernel/exit.c:820 do_group_exit+0xd4/0x2a0 kernel/exit.c:950 get_signal+0x21b1/0x2440 kernel/signal.c:2858 arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8c29c8b639 Code: Unable to access opcode bytes at 0x7f8c29c8b60f. RSP: 002b:00007f8c28fff218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f8c29dabf88 RCX: 00007f8c29c8b639 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f8c29dabf8c RBP: 00007f8c29dabf80 R08: 00007ffc9a5df080 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f8c29dabf8c R13: 00007ffc9a4a7d8f R14: 00007f8c28fff300 R15: 0000000000022000 Allocated by task 24097: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x304/0x410 mm/slub.c:3443 perf_event_alloc.part.0+0x69/0x3bc0 kernel/events/core.c:11626 perf_event_alloc kernel/events/core.c:12175 [inline] __do_sys_perf_event_open+0x4ae/0x32e0 kernel/events/core.c:12273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 24097: kasan_save_stack+0x22/0x40 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:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0xee/0x5c0 mm/slub.c:3683 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 put_event kernel/events/core.c:5095 [inline] perf_event_release_kernel+0x6f6/0x940 kernel/events/core.c:5210 perf_release+0x37/0x50 kernel/events/core.c:5220 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 task_work_add+0x7f/0x2c0 kernel/task_work.c:48 event_sched_out+0xe35/0x1190 kernel/events/core.c:2294 __perf_remove_from_context+0x8b/0xc40 kernel/events/core.c:2359 event_function+0x2a2/0x3e0 kernel/events/core.c:254 remote_function kernel/events/core.c:92 [inline] remote_function+0x122/0x1b0 kernel/events/core.c:72 __flush_smp_call_function_queue+0x205/0x9a0 kernel/smp.c:630 __sysvec_call_function_single+0xce/0x4e0 arch/x86/kernel/smp.c:248 sysvec_call_function_single+0x92/0xc0 arch/x86/kernel/smp.c:243 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:657 The buggy address belongs to the object at ffff88805b0e97c0 which belongs to the cache perf_event of size 1392 The buggy address is located 1112 bytes inside of 1392-byte region [ffff88805b0e97c0, ffff88805b0e9d30) The buggy address belongs to the physical page: page:ffffea00016c3a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b0e8 head:ffffea00016c3a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880120c23c0 raw: 0000000000000000 0000000080150015 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 19743, tgid 19737 (syz-executor.1), ts 222945417932, free_ts 222944909859 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5555 __alloc_pages_node include/linux/gfp.h:223 [inline] alloc_slab_page mm/slub.c:1796 [inline] allocate_slab+0x80/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] kmem_cache_alloc_node+0x191/0x410 mm/slub.c:3443 perf_event_alloc.part.0+0x69/0x3bc0 kernel/events/core.c:11626 perf_event_alloc kernel/events/core.c:12175 [inline] __do_sys_perf_event_open+0x4ae/0x32e0 kernel/events/core.c:12273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2586 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x2b4/0x3d0 mm/slub.c:3422 ptlock_alloc mm/memory.c:5842 [inline] ptlock_init include/linux/mm.h:2336 [inline] pmd_ptlock_init include/linux/mm.h:2422 [inline] pgtable_pmd_page_ctor include/linux/mm.h:2458 [inline] pmd_alloc_one include/asm-generic/pgalloc.h:129 [inline] __pmd_alloc+0xc3/0x5d0 mm/memory.c:5294 pmd_alloc include/linux/mm.h:2286 [inline] __handle_mm_fault+0x8c8/0x3a40 mm/memory.c:5057 handle_mm_fault+0x1cc/0x780 mm/memory.c:5218 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff88805b0e9b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b0e9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b0e9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b0e9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b0e9d00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc 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