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Date: Mon, 24 Aug 2026 15:48:15 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8cca2f.dbb3a75c.7844.0010.GAE@google.com> Subject: [moderation/CI] Re: swiotlb: avoid swiotlb copy on network sockets From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v2] swiotlb: avoid swiotlb copy on network sockets https://lore.kernel.org/all/20260824152932.1583506-1-lrizzo@google.com * [PATCH v2 1/5] swiotlb: enforce pool nareas and nslabs invariants * [PATCH v2 2/5] swiotlb/mm: Implement SWIOTLB nocopy page allocator * [PATCH v2 3/5] net/swiotlb: Track bounce device per socket * [PATCH v2 4/5] net: Divert socket allocations to SWIOTLB for nocopy TX * [PATCH v2 5/5] swiotlb: Implement RX nocopy with fast recycling eviction and found the following issue: general protection fault in page_pool_put_unrefed_netmem Full report is available here: https://ci.syzbot.org/series/b17756c4-983f-4d7a-8415-3da06c0dda99 *** general protection fault in page_pool_put_unrefed_netmem tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvald= s/linux base: 0a0d1d55dad570724bf8c7ea83409639cfb4be9b arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp= 1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/20e51ca2-88da-4674-9797-a62c6474309= 5/config syz repro: https://ci.syzbot.org/findings/4385dd7f-d1fc-4627-ad19-6862c780a= 90c/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc= 0000000082: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000410-0x0000000000000417] CPU: 0 UID: 0 PID: 5836 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:swiotlb_addr_in_default_pool include/linux/swiotlb.h:177 [inline] RIP: 0010:swiotlb_is_nocopy_addr include/linux/swiotlb.h:184 [inline] RIP: 0010:__page_pool_put_page net/core/page_pool.c:851 [inline] RIP: 0010:page_pool_put_unrefed_netmem+0x22a/0xd20 net/core/page_pool.c:930 Code: 5c 63 00 00 89 c5 31 ff 89 c6 e8 61 17 04 f8 85 ed 0f 84 07 08 00 00 = e8 54 12 04 f8 49 81 c4 10 04 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 7= 4 08 4c 89 e7 e8 37 c7 73 f8 4d 8b 24 24 4d 85 e4 RSP: 0018:ffffc900039df230 EFLAGS: 00010206 RAX: 0000000000000082 RBX: 0000000000000000 RCX: ffff888160efda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff89c3aca5 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8ed5a4e0 R12: 0000000000000410 R13: dffffc0000000000 R14: ffffea0004450300 R15: 0000000004450300 FS: 00007f08f83e86c0(0000) GS:ffff88818d6fc000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd455a8fe8 CR3: 00000001134ac000 CR4: 00000000000006f0 Call Trace: page_pool_put_netmem include/net/page_pool/helpers.h:343 [inline] page_pool_put_full_netmem include/net/page_pool/helpers.h:373 [inline] napi_pp_put_page+0x133/0x1e0 net/core/skbuff.c:1036 skb_pp_recycle net/core/skbuff.c:1047 [inline] skb_free_head net/core/skbuff.c:1091 [inline] skb_release_data+0x8c3/0xab0 net/core/skbuff.c:1122 skb_release_all net/core/skbuff.c:1197 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1211 llc_rcv+0x77a/0xcb0 net/llc/llc_input.c:-1 __netif_receive_skb_list_ptype net/core/dev.c:6312 [inline] __netif_receive_skb_list_core+0x784/0x830 net/core/dev.c:6354 __netif_receive_skb_list net/core/dev.c:6406 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6497 netif_receive_skb_list+0x67/0x480 net/core/dev.c:6549 xdp_recv_frames net/bpf/test_run.c:268 [inline] xdp_test_run_batch net/bpf/test_run.c:349 [inline] bpf_test_run_xdp_live+0x1875/0x1c20 net/bpf/test_run.c:378 bpf_prog_test_run_xdp+0x7d8/0x11d0 net/bpf/test_run.c:1463 bpf_prog_test_run+0x2c5/0x340 kernel/bpf/syscall.c:4804 __sys_bpf+0xa22/0xd90 kernel/bpf/syscall.c:6385 __do_sys_bpf kernel/bpf/syscall.c:6486 [inline] __se_sys_bpf kernel/bpf/syscall.c:6483 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6483 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08f759e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f08f83e8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f08f7825fa0 RCX: 00007f08f759e0d9 RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a RBP: 00007f08f7635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f08f7826038 R14: 00007f08f7825fa0 R15: 00007fffc4c69778 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:swiotlb_addr_in_default_pool include/linux/swiotlb.h:177 [inline] RIP: 0010:swiotlb_is_nocopy_addr include/linux/swiotlb.h:184 [inline] RIP: 0010:__page_pool_put_page net/core/page_pool.c:851 [inline] RIP: 0010:page_pool_put_unrefed_netmem+0x22a/0xd20 net/core/page_pool.c:930 Code: 5c 63 00 00 89 c5 31 ff 89 c6 e8 61 17 04 f8 85 ed 0f 84 07 08 00 00 = e8 54 12 04 f8 49 81 c4 10 04 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 7= 4 08 4c 89 e7 e8 37 c7 73 f8 4d 8b 24 24 4d 85 e4 RSP: 0018:ffffc900039df230 EFLAGS: 00010206 RAX: 0000000000000082 RBX: 0000000000000000 RCX: ffff888160efda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff89c3aca5 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8ed5a4e0 R12: 0000000000000410 R13: dffffc0000000000 R14: ffffea0004450300 R15: 0000000004450300 FS: 00007f08f83e86c0(0000) GS:ffff88818d6fc000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd455a8fe8 CR3: 00000001134ac000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 00 00 add %al,(%rax) 2: 89 c5 mov %eax,%ebp 4: 31 ff xor %edi,%edi 6: 89 c6 mov %eax,%esi 8: e8 61 17 04 f8 call 0xf804176e d: 85 ed test %ebp,%ebp f: 0f 84 07 08 00 00 je 0x81c 15: e8 54 12 04 f8 call 0xf804126e 1a: 49 81 c4 10 04 00 00 add $0x410,%r12 21: 4c 89 e0 mov %r12,%rax 24: 48 c1 e8 03 shr $0x3,%rax * 28: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruct= ion 2d: 74 08 je 0x37 2f: 4c 89 e7 mov %r12,%rdi 32: e8 37 c7 73 f8 call 0xf873c76e 37: 4d 8b 24 24 mov (%r12),%r12 3b: 4d 85 e4 test %r12,%r12 *** 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 fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported. 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