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From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] bpf: Prep patches for static stack liveness. https://lore.kernel.org/all/20260401021635.34636-1-alexei.starovoitov@gmail.com * [PATCH bpf-next 1/6] bpf: Do register range validation early * [PATCH bpf-next 2/6] bpf: Sort subprogs in topological order after check_cfg() * [PATCH bpf-next 3/6] selftests/bpf: Add tests for subprog topological ordering * [PATCH bpf-next 4/6] bpf: Add compute_const_regs() and prune_dead_branches() passes * [PATCH bpf-next 5/6] bpf: Move verifier helpers to header * [PATCH bpf-next 6/6] bpf: Add helper and kfunc stack access size resolution and found the following issue: UBSAN: array-index-out-of-bounds in do_check Full report is available here: https://ci.syzbot.org/series/3bdef783-321d-4d8d-9fbb-fd61f6cd92d5 *** UBSAN: array-index-out-of-bounds in do_check tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 0eeb0094ba0321f0927806857b5f01c1577bc245 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/925251e6-c091-44e6-a321-22bd3bffd780/config can: raw protocol can: broadcast manager protocol can: netlink gateway - max_hops=1 can: SAE J1939 can: isotp protocol (max_pdu_size 8300) Bluetooth: RFCOMM TTY layer initialized Bluetooth: RFCOMM socket layer initialized Bluetooth: RFCOMM ver 1.11 Bluetooth: BNEP (Ethernet Emulation) ver 1.3 Bluetooth: BNEP filters: protocol multicast Bluetooth: BNEP socket layer initialized Bluetooth: HIDP (Human Interface Emulation) ver 1.2 Bluetooth: HIDP socket layer initialized NET: Registered PF_RXRPC protocol family Key type rxrpc registered Key type rxrpc_s registered NET: Registered PF_KCM protocol family lec:lane_module_init: lec.c: initialized mpoa:atm_mpoa_init: mpc.c: initialized l2tp_core: L2TP core driver, V2.0 l2tp_ppp: PPPoL2TP kernel driver, V2.0 l2tp_ip: L2TP IP encapsulation support (L2TPv3) l2tp_netlink: L2TP netlink interface l2tp_eth: L2TP ethernet pseudowire support (L2TPv3) l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3) NET: Registered PF_PHONET protocol family 8021q: 802.1Q VLAN Support v1.8 sctp: Hash tables configured (bind 32/56) NET: Registered PF_RDS protocol family Registered RDS/infiniband transport Registered RDS/tcp transport tipc: Activated (version 2.0.0) NET: Registered PF_TIPC protocol family tipc: Started in single node mode smc: adding smcd device lo without pnetid NET: Registered PF_SMC protocol family 9pnet: Installing 9P2000 support NET: Registered PF_CAIF protocol family NET: Registered PF_IEEE802154 protocol family Key type dns_resolver registered Key type ceph registered libceph: loaded (mon/osd proto 15/24) batman_adv: B.A.T.M.A.N. advanced 2025.5 (compatibility version 15) loaded openvswitch: Open vSwitch switching datapath NET: Registered PF_VSOCK protocol family mpls_gso: MPLS GSO support IPI shorthand broadcast: enabled sched_clock: Marking stable (25300061146, 122105816)->(25454415888, -32248926) registered taskstats version 1 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/bpf/verifier.c:21704:16 index 10 is out of range for type 'u32[10]' (aka 'unsigned int[10]') CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 ubsan_epilogue+0xa/0x30 __ubsan_handle_out_of_bounds+0xe8/0xf0 do_check+0x77a1/0x11d50 do_check_common+0x21ea/0x2dc0 bpf_check+0x242f/0x1cd90 bpf_prog_load+0x1484/0x1ae0 __sys_bpf+0x618/0x950 kern_sys_bpf+0x185/0x700 load+0x488/0xad0 do_one_initcall+0x250/0x8d0 do_initcall_level+0x104/0x190 do_initcalls+0x59/0xa0 kernel_init_freeable+0x2a6/0x3e0 kernel_init+0x1d/0x1d0 ret_from_fork+0x51e/0xb90 ret_from_fork_asm+0x1a/0x30 ---[ end trace ]--- *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported. The email will later be sent to: [alexei.starovoitov@gmail.com andrii@kernel.org bpf@vger.kernel.org daniel@iogearbox.net eddyz87@gmail.com martin.lau@kernel.org memxor@gmail.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid