================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 64 at addr ffff888132add510 by task syz.2.917/3609 CPU: 1 PID: 3609 Comm: syz.2.917 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x44/0x70 mm/kasan/shadow.c:66 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline] bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334 bpf_prog_000f949dc4761d6a+0x28/0x3d bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:put_ctx+0x164/0x1a0 kernel/events/core.c:1220 Code: 00 44 89 e6 e8 3d aa da ff 45 85 e4 7e 38 e8 13 a6 da ff 48 81 c3 10 01 00 00 48 89 df 48 c7 c6 70 2d 99 81 e8 8d 39 c6 ff 5b <41> 5c 41 5e 41 5f 5d c3 e8 ef a5 da ff 4c 89 f7 be 03 00 00 00 e8 RSP: 0018:ffffc90000777bb8 EFLAGS: 00000287 RAX: ffffffff8196c842 RBX: ffff8881325acc00 RCX: 0000000000080000 RDX: ffffc9000225d000 RSI: 000000000000002d RDI: 000000000000002e RBP: ffffc90000777bd0 R08: ffff8881325accc3 R09: 1ffff110264b5998 R10: dffffc0000000000 R11: ffffed10264b5999 R12: 0000000040042408 R13: dffffc0000000000 R14: ffff8881325accc0 R15: 0000000000000004 perf_event_ctx_unlock kernel/events/core.c:1322 [inline] perf_ioctl+0x140e/0x1e70 kernel/events/core.c:5838 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 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: 0033:0x7f923d99c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f923e8e0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f923dc15fa0 RCX: 00007f923d99c819 RDX: 0000000000000005 RSI: 0000000040042408 RDI: 0000000000000006 RBP: 00007f923da32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f923dc16038 R14: 00007f923dc15fa0 R15: 00007fffe39773b8 Allocated by task 3609: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline] bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51 stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline] __se_sys_bpf kernel/bpf/syscall.c:5107 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 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 ffff888132add500 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888132add500, ffff888132add540) The buggy address belongs to the physical page: page:ffffea0004cab740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132add flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004593e40 dead000000000003 ffff888100042780 raw: 0000000000000000 0000000000200020 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 390, tgid 389 (syz.2.23), ts 31893848691, free_ts 31780187908 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3d0 mm/slub.c:2020 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc+0xa1/0x1e0 mm/slab_common.c:951 kmalloc include/linux/slab.h:568 [inline] allocate_probes kernel/tracepoint.c:109 [inline] func_add kernel/tracepoint.c:205 [inline] tracepoint_add_func+0x291/0x8f0 kernel/tracepoint.c:338 tracepoint_probe_register_prio kernel/tracepoint.c:511 [inline] tracepoint_probe_register+0x5a/0x90 kernel/tracepoint.c:531 trace_event_reg+0x159/0x270 kernel/trace/trace_events.c:680 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x455/0x960 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x240/0x2e0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8e/0x120 kernel/events/core.c:10036 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1578 [inline] free_pcp_prepare mm/page_alloc.c:1652 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618 free_unref_page+0x95/0x540 mm/page_alloc.c:3716 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6014 bpf_ringbuf_free kernel/bpf/ringbuf.c:231 [inline] ringbuf_map_free+0xbf/0x110 kernel/bpf/ringbuf.c:240 bpf_map_free_deferred+0x105/0x1c0 kernel/bpf/syscall.c:637 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888132add400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888132add480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888132add500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888132add580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888132add600: 00 00 00 00 05 fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 00 44 89 e6 add %al,-0x1a(%rcx,%rcx,4) 4: e8 3d aa da ff call 0xffdaaa46 9: 45 85 e4 test %r12d,%r12d c: 7e 38 jle 0x46 e: e8 13 a6 da ff call 0xffdaa626 13: 48 81 c3 10 01 00 00 add $0x110,%rbx 1a: 48 89 df mov %rbx,%rdi 1d: 48 c7 c6 70 2d 99 81 mov $0xffffffff81992d70,%rsi 24: e8 8d 39 c6 ff call 0xffc639b6 29: 5b pop %rbx * 2a: 41 5c pop %r12 <-- trapping instruction 2c: 41 5e pop %r14 2e: 41 5f pop %r15 30: 5d pop %rbp 31: c3 ret 32: e8 ef a5 da ff call 0xffdaa626 37: 4c 89 f7 mov %r14,%rdi 3a: be 03 00 00 00 mov $0x3,%esi 3f: e8 .byte 0xe8