================================================================== BUG: KASAN: use-after-free in tracing_open_file_tr+0x18a/0x330 kernel/trace/trace.c:4898 Read of size 8 at addr ffff888122c73480 by task syz-executor382/605 CPU: 0 PID: 605 Comm: syz-executor382 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351 tracing_open_file_tr+0x18a/0x330 kernel/trace/trace.c:4898 do_dentry_open+0x885/0x11f0 fs/open.c:884 vfs_open+0x73/0x80 fs/open.c:1017 do_open fs/namei.c:3633 [inline] path_openat+0x2699/0x2f30 fs/namei.c:3790 do_filp_open+0x1ee/0x420 fs/namei.c:3817 do_sys_openat2+0x15e/0x820 fs/open.c:1343 do_sys_open fs/open.c:1359 [inline] __do_sys_openat fs/open.c:1375 [inline] __se_sys_openat fs/open.c:1370 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1370 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f97163f5639 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff489847c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f97163f5639 RDX: 0000000000000002 RSI: 0000200000000140 RDI: 00000000ffffff9c RBP: 6665636172742f2e R08: 0000000000000009 R09: 0000000000000009 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000639e R13: 00007fff489847dc R14: 00007fff489847f0 R15: 0000200000000008 Allocated by task 605: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:334 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x166/0x320 mm/slub.c:3408 trace_create_new_event+0x8c/0x3a0 kernel/trace/trace_events.c:2951 __trace_add_new_event kernel/trace/trace_events.c:2983 [inline] __add_event_to_tracers kernel/trace/trace_events.c:3709 [inline] trace_add_event_call+0x96/0x140 kernel/trace/trace_events.c:3024 trace_probe_register_event_call+0x35a/0x3f0 kernel/trace/trace_probe.c:1138 __trace_eprobe_create+0x14b9/0x1690 kernel/trace/trace_eprobe.c:1062 trace_probe_create+0xd5/0x140 kernel/trace/trace_probe.c:1244 eprobe_dyn_event_create+0x1c/0x20 kernel/trace/trace_eprobe.c:66 create_dyn_event+0xbb/0x150 kernel/trace/trace_dynevent.c:152 trace_parse_run_command+0x1c6/0x2e0 kernel/trace/trace.c:10252 dyn_event_write+0x34/0x40 kernel/trace/trace_dynevent.c:262 vfs_write+0x3fb/0xd00 fs/read_write.c:582 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 602: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] kmem_cache_free+0x12d/0x300 mm/slub.c:3737 event_file_put+0xcf/0x150 kernel/trace/trace_events.c:-1 remove_event_file_dir+0x400/0x4c0 kernel/trace/trace_events.c:1160 remove_event_from_tracers kernel/trace/trace_events.c:2653 [inline] event_remove kernel/trace/trace_events.c:2688 [inline] __trace_remove_event_call+0x245/0x540 kernel/trace/trace_events.c:3037 probe_remove_event_call kernel/trace/trace_events.c:3074 [inline] trace_remove_event_call+0x1d3/0x2b0 kernel/trace/trace_events.c:3094 trace_probe_unregister_event_call kernel/trace/trace_probe.h:334 [inline] unregister_trace_eprobe kernel/trace/trace_eprobe.c:96 [inline] eprobe_dyn_event_release+0x149/0x2b0 kernel/trace/trace_eprobe.c:109 dyn_events_release_all kernel/trace/trace_dynevent.c:227 [inline] dyn_event_open+0x208/0x2d0 kernel/trace/trace_dynevent.c:251 do_dentry_open+0x885/0x11f0 fs/open.c:884 vfs_open+0x73/0x80 fs/open.c:1017 do_open fs/namei.c:3633 [inline] path_openat+0x2699/0x2f30 fs/namei.c:3790 do_filp_open+0x1ee/0x420 fs/namei.c:3817 do_sys_openat2+0x15e/0x820 fs/open.c:1343 do_sys_open fs/open.c:1359 [inline] __do_sys_creat fs/open.c:1437 [inline] __se_sys_creat fs/open.c:1431 [inline] __x64_sys_creat+0x8e/0xb0 fs/open.c:1431 x64_sys_call+0x116/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:86 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888122c73438 which belongs to the cache trace_event_file of size 88 The buggy address is located 72 bytes inside of 88-byte region [ffff888122c73438, ffff888122c73490) The buggy address belongs to the physical page: page:ffffea00048b1cc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x122c73 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff88810004d500 raw: 0000000000000000 0000000080220022 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 517, tgid 517 (syz-executor382), ts 25239230439, free_ts 25231344132 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x1a8/0x320 mm/slub.c:3408 trace_create_new_event+0x8c/0x3a0 kernel/trace/trace_events.c:2951 __trace_add_new_event kernel/trace/trace_events.c:2983 [inline] __add_event_to_tracers kernel/trace/trace_events.c:3709 [inline] trace_add_event_call+0x96/0x140 kernel/trace/trace_events.c:3024 trace_probe_register_event_call+0x35a/0x3f0 kernel/trace/trace_probe.c:1138 __trace_eprobe_create+0x14b9/0x1690 kernel/trace/trace_eprobe.c:1062 trace_probe_create+0xd5/0x140 kernel/trace/trace_probe.c:1244 eprobe_dyn_event_create+0x1c/0x20 kernel/trace/trace_eprobe.c:66 create_dyn_event+0xbb/0x150 kernel/trace/trace_dynevent.c:152 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3773 release_pages+0xc7e/0xce0 mm/swap.c:1053 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:316 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1b2/0x380 mm/mmu_gather.c:361 exit_mmap+0x41d/0xc10 mm/mmap.c:3393 __mmput+0x92/0x340 kernel/fork.c:1321 mmput+0x4b/0x150 kernel/fork.c:1345 exit_mm kernel/exit.c:575 [inline] do_exit+0xa62/0x29f0 kernel/exit.c:883 do_group_exit+0x21b/0x2e0 kernel/exit.c:1040 __do_sys_exit_group kernel/exit.c:1051 [inline] __se_sys_exit_group kernel/exit.c:1049 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1049 x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888122c73380: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888122c73400: fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb >ffff888122c73480: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ^ ffff888122c73500: fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ffff888122c73580: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fc ==================================================================