linux-kernel - [syzbot ci] Re: make vmalloc gfp flags usage more apparent

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Message-ID: <69123b72.a70a0220.22f260.0105.GAE@google.com>
Date: Mon, 10 Nov 2025 11:22:26 -0800
From: syzbot ci <syzbot+ci9989da8336cb2bc7@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, hch@...radead.org, hch@....de, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, urezki@...il.com, 
	vishal.moola@...il.com
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: make vmalloc gfp flags usage more apparent

syzbot ci has tested the following series

[v1] make vmalloc gfp flags usage more apparent
https://lore.kernel.org/all/20251110160457.61791-1-vishal.moola@gmail.com
* [PATCH 1/4] mm/vmalloc: warn on invalid vmalloc gfp flags
* [PATCH 2/4] mm/vmalloc: Add a helper to optimize vmalloc allocation gfps
* [PATCH 3/4] mm/vmalloc: cleanup large_gfp in vm_area_alloc_pages()
* [PATCH 4/4] mm/vmalloc: cleanup gfp flag use in new_vmap_block()

and found the following issue:
WARNING: kmalloc bug in bpf_prog_alloc_no_stats

Full report is available here:
https://ci.syzbot.org/series/488ab7c0-de91-4749-bbb2-ca76c3fb798b

***

WARNING: kmalloc bug in bpf_prog_alloc_no_stats

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      02dafa01ec9a00c3758c1c6478d82fe601f5f1ba
arch:      amd64
compiler:  Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config:    https://ci.syzbot.org/builds/2334ae39-552d-4ca2-8562-7adc18ce2cb0/config

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 2025.4 (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 (21550045890, 115271513)->(21677757748, -12440345)
registered taskstats version 1
------------[ cut here ]------------
Unexpected gfp: 0x100000 (__GFP_HARDWALL). Fixing up to gfp: 0xdc0 (GFP_KERNEL|__GFP_ZERO). Fix your code!
WARNING: CPU: 1 PID: 1 at mm/vmalloc.c:3936 vmalloc_fix_flags+0x9c/0xe0
Modules linked in:
CPU: 1 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
RIP: 0010:vmalloc_fix_flags+0x9c/0xe0
Code: 81 e6 1f 52 fe ff 89 74 24 30 81 e3 e0 ad 01 00 89 5c 24 20 90 48 c7 c7 80 b9 76 8b 4c 89 fa 89 d9 4d 89 f0 e8 85 31 6e ff 90 <0f> 0b 90 90 8b 44 24 20 48 c7 04 24 0e 36 e0 45 4b c7 04 2c 00 00
RSP: 0000:ffffc90000066d60 EFLAGS: 00010246
RAX: 50a201fad922ca00 RBX: 0000000000000dc0 RCX: ffff888160a80000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000066df8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba678 R12: 1ffff9200000cdac
R13: dffffc0000000000 R14: ffffc90000066d80 R15: ffffc90000066d90
FS:  0000000000000000(0000) GS:ffff8882a9f32000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000dd38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __vmalloc_noprof+0xf2/0x120
 bpf_prog_alloc_no_stats+0x4a/0x4d0
 bpf_prog_alloc+0x3c/0x1a0
 bpf_prog_load+0x735/0x19e0
 __sys_bpf+0x507/0x860
 kern_sys_bpf+0x17d/0x6b0
 load+0x39e/0x940
 do_one_initcall+0x236/0x820
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x334/0x4b0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>


***

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@...kaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.