Hello, syzbot found the following issue on: HEAD commit: c02d24a5af66 Add linux-next specific files for 20241003 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1404ab9f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=94f9caf16c0af42d dashboard link: https://syzkaller.appspot.com/bug?extid=80b36e60457a005e0530 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10f633d0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1204ab9f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/641e642c9432/disk-c02d24a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/98aaf20c29e0/vmlinux-c02d24a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/c23099f2d86b/bzImage-c02d24a5.xz The issue was bisected to: commit d0a38fad51cc70ab3dd3c59b54d8079ac19220b9 Author: Feng Tang <feng.tang@xxxxxxxxx> Date: Wed Sep 11 06:45:34 2024 +0000 mm/slub: Improve redzone check and zeroing for krealloc() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16da4d27980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15da4d27980000 console output: https://syzkaller.appspot.com/x/log.txt?x=11da4d27980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+80b36e60457a005e0530@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: d0a38fad51cc ("mm/slub: Improve redzone check and zeroing for krealloc()") ================================================================== BUG: KFENCE: memory corruption in skb_kfree_head net/core/skbuff.c:1086 [inline] BUG: KFENCE: memory corruption in skb_free_head net/core/skbuff.c:1098 [inline] BUG: KFENCE: memory corruption in pskb_expand_head+0x4fc/0x1380 net/core/skbuff.c:2307 Corrupted memory at 0xffff88823be221c0 [ 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 ] (in kfence-#16): skb_kfree_head net/core/skbuff.c:1086 [inline] skb_free_head net/core/skbuff.c:1098 [inline] pskb_expand_head+0x4fc/0x1380 net/core/skbuff.c:2307 __skb_cow include/linux/skbuff.h:3702 [inline] skb_cow_head include/linux/skbuff.h:3736 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:354 [inline] __vlan_insert_tag include/linux/if_vlan.h:400 [inline] skb_vlan_push+0x319/0x8d0 net/core/skbuff.c:6324 ____bpf_skb_vlan_push net/core/filter.c:3193 [inline] bpf_skb_vlan_push+0x215/0x8e0 net/core/filter.c:3183 bpf_prog_73b0c961a278ad0e+0x5b/0x60 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:433 bpf_prog_test_run_skb+0xc97/0x1820 net/bpf/test_run.c:1094 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f kfence-#16: 0xffff88823be22000-0xffff88823be221bf, size=448, cache=kmalloc-512 allocated by task 5407 on cpu 0 at 90.755534s (0.100574s ago): kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] bpf_test_init+0xe1/0x180 net/bpf/test_run.c:669 bpf_prog_test_run_skb+0x2bb/0x1820 net/bpf/test_run.c:1000 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f freed by task 5407 on cpu 0 at 90.755621s (0.144394s ago): skb_kfree_head net/core/skbuff.c:1086 [inline] skb_free_head net/core/skbuff.c:1098 [inline] pskb_expand_head+0x4fc/0x1380 net/core/skbuff.c:2307 __skb_cow include/linux/skbuff.h:3702 [inline] skb_cow_head include/linux/skbuff.h:3736 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:354 [inline] __vlan_insert_tag include/linux/if_vlan.h:400 [inline] skb_vlan_push+0x319/0x8d0 net/core/skbuff.c:6324 ____bpf_skb_vlan_push net/core/filter.c:3193 [inline] bpf_skb_vlan_push+0x215/0x8e0 net/core/filter.c:3183 bpf_prog_73b0c961a278ad0e+0x5b/0x60 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:433 bpf_prog_test_run_skb+0xc97/0x1820 net/bpf/test_run.c:1094 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline] __se_sys_bpf kernel/bpf/syscall.c:5739 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5407 Comm: syz-executor182 Not tainted 6.12.0-rc1-next-20241003-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ================================================================== --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
