[moderation/CI] Re: bpf: Support non-linear skbs for BPF_PROG_TEST_RUN

[syzbot ci]

syzbot ci has tested the following series

[v2] bpf: Support non-linear skbs for BPF_PROG_TEST_RUN
https://lore.kernel.org/all/cover.1757862238....@gmail.com
* [PATCH bpf-next v2 1/4] bpf: Refactor cleanup of bpf_prog_test_run_skb
* [PATCH bpf-next v2 2/4] bpf: Craft non-linear skbs in BPF_PROG_TEST_RUN
* [PATCH bpf-next v2 3/4] selftests/bpf: Support non-linear flag in test loader
* [PATCH bpf-next v2 4/4] selftests/bpf: Test direct packet access on non-linear skbs

and found the following issue:
kernel BUG in bpf_test_init

Full report is available here:
https://ci.syzbot.org/series/23791187-8fc0-4c8a-bebc-3909e311c11e

***

kernel BUG in bpf_test_init

tree: bpf-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
base: a578b54a8ad282dd739e4d1f4e8352fc8ac1c4a0
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/037e1e74-be70-4216-ad05-430c2deea0bb/config
C repro: https://ci.syzbot.org/findings/adf84c1c-28ba-48f5-9638-8339635cebe5/c_repro
syz repro: https://ci.syzbot.org/findings/adf84c1c-28ba-48f5-9638-8339635cebe5/syz_repro

------------[ cut here ]------------
kernel BUG at arch/x86/mm/physaddr.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6014 Comm: syz.0.17 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:__phys_addr+0x173/0x180 arch/x86/mm/physaddr.c:28
Code: e8 02 2a 4b 00 48 c7 c7 50 d1 fa 8d 48 89 de 4c 89 f2 e8 e0 2f 8b 03 e9 4d ff ff ff e8 e6 29 4b 00 90 0f 0b e8 de 29 4b 00 90 <0f> 0b e8 d6 29 4b 00 90 0f 0b 0f 1f 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900032d7b68 EFLAGS: 00010293
RAX: ffffffff81749722 RBX: 00006180047f3080 RCX: ffff8881079b9cc0
RDX: 0000000000000000 RSI: 0000000000000061 RDI: 0000000000000000
RBP: 00000000000000db R08: ffff88811fcc20da R09: 0000000000000000
R10: ffff88811fcc2000 R11: ffffed1023f9841c R12: 00000000000000db
R13: 00000000000000db R14: 0000000000000028 R15: 0000000000000061
FS: 000055557464c500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001f984000 CR4: 00000000000006f0
Call Trace:
<TASK>
virt_to_folio include/linux/mm.h:1180 [inline]
kfree+0x77/0x440 mm/slub.c:4886
bpf_test_init+0x1ba/0x220 net/bpf/test_run.c:686
bpf_prog_test_run_skb+0x2c8/0x1700 net/bpf/test_run.c:1039
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4590
__sys_bpf+0x581/0x870 kernel/bpf/syscall.c:6047
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f502198eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd90d34788 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5021bd5fa0 RCX: 00007f502198eba9
RDX: 0000000000000050 RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f5021a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5021bd5fa0 R14: 00007f5021bd5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__phys_addr+0x173/0x180 arch/x86/mm/physaddr.c:28
Code: e8 02 2a 4b 00 48 c7 c7 50 d1 fa 8d 48 89 de 4c 89 f2 e8 e0 2f 8b 03 e9 4d ff ff ff e8 e6 29 4b 00 90 0f 0b e8 de 29 4b 00 90 <0f> 0b e8 d6 29 4b 00 90 0f 0b 0f 1f 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900032d7b68 EFLAGS: 00010293
RAX: ffffffff81749722 RBX: 00006180047f3080 RCX: ffff8881079b9cc0
RDX: 0000000000000000 RSI: 0000000000000061 RDI: 0000000000000000
RBP: 00000000000000db R08: ffff88811fcc20da R09: 0000000000000000
R10: ffff88811fcc2000 R11: ffffed1023f9841c R12: 00000000000000db
R13: 00000000000000db R14: 0000000000000028 R15: 0000000000000061
FS: 000055557464c500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001f984000 CR4: 00000000000006f0


***

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: syz...@syzkaller.appspotmail.com

---
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If the report looks fine to you, reply with:
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[Aleksandr Nogikh]

#syz upstream

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