From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f79.google.com (mail-oa1-f79.google.com [209.85.160.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B3F63EF0DE for ; Thu, 19 Mar 2026 17:27:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773941247; cv=none; b=B6Bee4GKKZ0I8qt2VrKrbe4zNylc0jBSIf3dyu3UJemi4r5LFkK0Bjzug4eZofXPRrdI5NMDUYoAFnQH17aPNrWVSzECzpVZ52QmNv6GjSo+HCI6UixVEhcgU/G0vMj4WWSFftU2mD+QFyJBU4Qlvw+hJGSO/LYeYd+PeqA5kHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773941247; c=relaxed/simple; bh=Ds5fowKxusoVZ881S4ea3LZnL395zPO+K6XJGETEnRY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=UDnvpxX0QBTrC7EX0ImFk5egAiD4frXjF53L0OqYApBz4vbtA4x99rcANc3v4UBn3iHnqaphkyBO/4a5GG/4RpnQbu/2gMfO/4AyFX2+zL0lvb62eLQo3kwaTosJPBT4892Qr2Fhlr3GNP99zx5Yjmg2c06vFTDKruTv7IXiZOE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f79.google.com with SMTP id 586e51a60fabf-4171fdb5a67so10336443fac.0 for ; Thu, 19 Mar 2026 10:27:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773941240; x=1774546040; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=HRkEc4XliWZIb+ZbjM5vjMJz0ZRaz8Ne4UApCAxF2qQ=; b=QXxt50xMIm5451/d81n4U2z75Jq38s1tTanlyf4tOsM4zOfZu9sGgMWlrJ3/p4GSUA nbibmOjmSEpjIyOw3eikxExSi4JknzyO2EZ29tWdAFLhAEB6gwHJC9rCk6Ml54Ut6aBs 9zt5Y2hR8J4lExM7/C7q3Ugc9MELooHJGAjvvEza8boE7+tkBgpPMcmFlTNqmTBDIx9X htgHb3PompFO8GXgG+SAHLCYX/OSIC8sypXp3MBfBOSfBDCthU8r4T+2I9jc6CheKMcw 7zZaE4uBP3ga1fnjotew1BdYwK0dczTdyrI9LNNzvskXWI7eJjUbt42MK5PjVUwkG4m2 fzFA== X-Forwarded-Encrypted: i=1; AJvYcCV85tAhcWg1EGWQfdzhkLGXw8AsXJlYm2ytLQO1yCKUxnPvVsOUWJVcKYE9FExoPSZhHHG3Qj1aLH7X3ewj/flj5qI=@vger.kernel.org X-Gm-Message-State: AOJu0Ywz+azcVEiYg8cEMh8uh3VIvkZVnRvjGOI2fvvmBhB54fXWRzmu 1PDb6Fk1RSle4z2NM7wqx43xtgKmrsVtmp8yCxBo1AvBf91TLoQfJ7RPCb14n2ZbSbsUsCPQnQP UTNm2aVjZ2LO80eXvVxhn/ziz2LPfBpVfariulyZujEZL5f+UPCGedjeldvw= Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:620:b0:67c:2204:945c with SMTP id 006d021491bc7-67c22f95bb2mr214636eaf.54.1773941240261; Thu, 19 Mar 2026 10:27:20 -0700 (PDT) Date: Thu, 19 Mar 2026 10:27:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bc31f8.050a0220.18f14c.0051.GAE@google.com> Subject: [syzbot] [bpf?] [trace?] KASAN: slab-use-after-free Read in bpf_trace_run4 (2) From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, martin.lau@linux.dev, mathieu.desnoyers@efficios.com, mattbobrowski@google.com, mhiramat@kernel.org, rostedt@goodmis.org, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b29fb8829bff Merge tag 'v7.0-rc3-ksmbd-server-fixes' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12ab575a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb dashboard link: https://syzkaller.appspot.com/bug?extid=ca51b6e7e751edd6bbfd compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b29fb882.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4fd392c86ab5/vmlinux-b29fb882.xz kernel image: https://storage.googleapis.com/syzbot-assets/32f95fb6f35f/bzImage-b29fb882.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca51b6e7e751edd6bbfd@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run4+0xe6/0x850 kernel/trace/bpf_trace.c:2131 Read of size 8 at addr ffff8880361a0318 by task udevd/5299 CPU: 0 UID: 0 PID: 5299 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run4+0xe6/0x850 kernel/trace/bpf_trace.c:2131 __traceiter_mm_page_alloc+0x3d/0x60 include/trace/events/kmem.h:180 __do_trace_mm_page_alloc include/trace/events/kmem.h:180 [inline] trace_mm_page_alloc+0x149/0x180 include/trace/events/kmem.h:180 __alloc_frozen_pages_noprof+0x1de/0x380 mm/page_alloc.c:5272 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2503 swap_cache_alloc_folio+0xd5/0x240 mm/swap_state.c:571 swap_cluster_readahead+0x369/0x690 mm/swap_state.c:749 swapin_readahead+0x196/0xc50 mm/swap_state.c:924 do_swap_page+0x56f/0x5a20 mm/memory.c:4802 handle_pte_fault mm/memory.c:6320 [inline] __handle_mm_fault mm/memory.c:6455 [inline] handle_mm_fault+0x12d2/0x3310 mm/memory.c:6624 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x55f04dab55f0 Code: c0 0f 85 0e 19 00 00 4c 8b 73 18 c7 44 24 28 00 00 00 00 49 89 dc 4c 8d 3d e9 95 02 00 4c 89 34 24 66 0f 1f 84 00 00 00 00 00 <41> 0f b6 1e 80 fb 35 0f 87 e3 01 00 00 0f b6 c3 49 63 04 87 4c 01 RSP: 002b:00007fff48a349c0 EFLAGS: 00010206 RAX: 000055f051ea3770 RBX: 0000000000000034 RCX: 0000000000000063 RDX: 0000000000000381 RSI: 000055f051eb5b50 RDI: 000055f051ecfdae RBP: 000055f052096b80 R08: 000055f04daf2100 R09: 000055f04daf2140 R10: 0000000000000000 R11: 0000000000000000 R12: 000055f051eb5270 R13: 000055f051eb02c0 R14: 000055f051ea4574 R15: 000055f04dadebcc Allocated by task 5326: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5383 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] bpf_raw_tp_link_attach+0x278/0x700 kernel/bpf/syscall.c:4264 bpf_raw_tracepoint_open+0x1b2/0x220 kernel/bpf/syscall.c:4312 __sys_bpf+0x846/0x950 kernel/bpf/syscall.c:6270 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 15: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2692 [inline] slab_free mm/slub.c:6168 [inline] kfree+0x1c1/0x630 mm/slub.c:6486 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 bpf_link_put_direct kernel/bpf/syscall.c:3323 [inline] bpf_link_release+0x6b/0x80 kernel/bpf/syscall.c:3330 __fput+0x44f/0xa70 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x70f/0x23c0 kernel/exit.c:976 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118 get_signal+0x1284/0x1330 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x176/0x620 kernel/entry/common.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 The buggy address belongs to the object at ffff8880361a0300 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 24 bytes inside of freed 192-byte region [ffff8880361a0300, ffff8880361a03c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880361a0400 pfn:0x361a0 flags: 0x4fff00000000200(workingset|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000200 ffff88801ac413c0 ffffea0000d7ce90 ffffea0000e14e90 raw: ffff8880361a0400 000000080010000f 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 922, tgid 922 (kworker/0:3), ts 22003490640, free_ts 22003061349 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3296 [inline] allocate_slab+0x77/0x660 mm/slub.c:3485 new_slab mm/slub.c:3543 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7178 __pcs_replace_empty_main+0x2f9/0x5e0 mm/slub.c:-1 alloc_from_pcs mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:4854 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] virtio_gpu_array_alloc+0x26/0xc0 drivers/gpu/drm/virtio/virtgpu_gem.c:170 virtio_gpu_update_dumb_bo drivers/gpu/drm/virtio/virtgpu_plane.c:171 [inline] virtio_gpu_primary_plane_update+0x38d/0x13a0 drivers/gpu/drm/virtio/virtgpu_plane.c:265 drm_atomic_helper_commit_planes+0x60f/0xec0 drivers/gpu/drm/drm_atomic_helper.c:3038 drm_atomic_helper_commit_tail+0x5f/0x500 drivers/gpu/drm/drm_atomic_helper.c:1989 commit_tail+0x29a/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:2074 drm_atomic_helper_commit+0xa6e/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2312 drm_atomic_commit+0x246/0x2b0 drivers/gpu/drm/drm_atomic.c:1775 drm_atomic_helper_dirtyfb+0xdec/0xf80 drivers/gpu/drm/drm_damage_helper.c:183 drm_fbdev_shmem_helper_fb_dirty+0x160/0x2d0 drivers/gpu/drm/drm_fbdev_shmem.c:117 page last free pid 70 tgid 70 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 ___free_pages_bulk mm/kasan/shadow.c:333 [inline] __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline] __kasan_populate_vmalloc+0x137/0x1d0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124 alloc_thread_stack_node kernel/fork.c:355 [inline] dup_task_struct+0x228/0x9a0 kernel/fork.c:924 copy_process+0x508/0x3cf0 kernel/fork.c:2050 kernel_clone+0x248/0x8e0 kernel/fork.c:2654 user_mode_thread+0x110/0x180 kernel/fork.c:2730 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880361a0200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880361a0280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880361a0300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880361a0380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880361a0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup