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006d021491bc7-699ab57164amr5015199eaf.1.1778413518490; Sun, 10 May 2026 04:45:18 -0700 (PDT) Date: Sun, 10 May 2026 04:45:18 -0700 In-Reply-To: <67e8340baa2c2772def267a801c8d5b201444d49.1778382236.git.caoruide123@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a006fce.a00a0220.1c3806.000f.GAE@google.com> Subject: [syzbot ci] Re: net: nsh: limit recursive GSO redispatch From: syzbot ci To: bird@lzu.edu.cn, caoruide123@gmail.com, davem@davemloft.net, jbenc@redhat.com, lkp@intel.com, lx24@stu.ynu.edu.cn, matttbe@kernel.org, n05ec@lzu.edu.cn, netdev@vger.kernel.org, tomapufckgml@gmail.com, yifanwucs@gmail.com, yuantan098@gmail.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v2] net: nsh: limit recursive GSO redispatch https://lore.kernel.org/all/67e8340baa2c2772def267a801c8d5b201444d49.1778382236.git.caoruide123@gmail.com * [PATCH net v2 1/1] net: nsh: limit recursive GSO redispatch and found the following issue: BUG: using __this_cpu_read() in preemptible code in nsh_gso_segment Full report is available here: https://ci.syzbot.org/series/cb23e640-2f7a-42e1-8bad-7249684b1cd5 *** BUG: using __this_cpu_read() in preemptible code in nsh_gso_segment tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git base: 496c0c4c53bbe1bad97e82cd12103df61a6e459d 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/a7e3d1e1-97c4-4876-99c8-658c4cef49c5/config syz repro: https://ci.syzbot.org/findings/62ca20c2-7c78-4820-b695-f63b15eaf738/syz_repro BUG: using __this_cpu_read() in preemptible [00000000] code: syz.1.18/5860 caller is dev_xmit_recursion include/linux/netdevice.h:3625 [inline] caller is nsh_gso_segment+0x535/0xed0 net/nsh/nsh.c:110 CPU: 0 UID: 0 PID: 5860 Comm: syz.1.18 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 lib/dump_stack.c:120 check_preemption_disabled+0xd3/0xe0 lib/smp_processor_id.c:47 dev_xmit_recursion include/linux/netdevice.h:3625 [inline] nsh_gso_segment+0x535/0xed0 net/nsh/nsh.c:110 skb_mac_gso_segment+0x31c/0x690 net/core/gso.c:53 __skb_gso_segment+0x376/0x540 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0xa21/0x14a0 net/core/dev.c:4039 validate_xmit_skb_list net/core/dev.c:4089 [inline] __dev_direct_xmit+0x1b4/0x750 net/core/dev.c:4922 dev_direct_xmit include/linux/netdevice.h:3431 [inline] packet_xmit+0x1b4/0x320 net/packet/af_packet.c:285 packet_snd net/packet/af_packet.c:3082 [inline] packet_sendmsg+0x3c81/0x4fb0 net/packet/af_packet.c:3114 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] __sys_sendto+0x672/0x710 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2268 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd6a99cdd9 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 ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd6b903028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcd6ac15fa0 RCX: 00007fcd6a99cdd9 RDX: 00000000000100a6 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007fcd6aa32d69 R08: 0000200000000140 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd6ac16038 R14: 00007fcd6ac15fa0 R15: 00007fff57a83608 BUG: using __this_cpu_add() in preemptible [00000000] code: syz.1.18/5860 caller is dev_xmit_recursion_inc include/linux/netdevice.h:3631 [inline] caller is nsh_gso_segment+0x57d/0xed0 net/nsh/nsh.c:113 CPU: 0 UID: 0 PID: 5860 Comm: syz.1.18 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 lib/dump_stack.c:120 check_preemption_disabled+0xd3/0xe0 lib/smp_processor_id.c:47 dev_xmit_recursion_inc include/linux/netdevice.h:3631 [inline] nsh_gso_segment+0x57d/0xed0 net/nsh/nsh.c:113 skb_mac_gso_segment+0x31c/0x690 net/core/gso.c:53 __skb_gso_segment+0x376/0x540 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0xa21/0x14a0 net/core/dev.c:4039 validate_xmit_skb_list net/core/dev.c:4089 [inline] __dev_direct_xmit+0x1b4/0x750 net/core/dev.c:4922 dev_direct_xmit include/linux/netdevice.h:3431 [inline] packet_xmit+0x1b4/0x320 net/packet/af_packet.c:285 packet_snd net/packet/af_packet.c:3082 [inline] packet_sendmsg+0x3c81/0x4fb0 net/packet/af_packet.c:3114 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] __sys_sendto+0x672/0x710 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2268 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd6a99cdd9 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 ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd6b903028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcd6ac15fa0 RCX: 00007fcd6a99cdd9 RDX: 00000000000100a6 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007fcd6aa32d69 R08: 0000200000000140 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd6ac16038 R14: 00007fcd6ac15fa0 R15: 00007fff57a83608 BUG: using __this_cpu_add() in preemptible [00000000] code: syz.1.18/5860 caller is dev_xmit_recursion_dec include/linux/netdevice.h:3636 [inline] caller is nsh_gso_segment+0x59f/0xed0 net/nsh/nsh.c:115 CPU: 0 UID: 0 PID: 5860 Comm: syz.1.18 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 lib/dump_stack.c:120 check_preemption_disabled+0xd3/0xe0 lib/smp_processor_id.c:47 dev_xmit_recursion_dec include/linux/netdevice.h:3636 [inline] nsh_gso_segment+0x59f/0xed0 net/nsh/nsh.c:115 skb_mac_gso_segment+0x31c/0x690 net/core/gso.c:53 __skb_gso_segment+0x376/0x540 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0xa21/0x14a0 net/core/dev.c:4039 validate_xmit_skb_list net/core/dev.c:4089 [inline] __dev_direct_xmit+0x1b4/0x750 net/core/dev.c:4922 dev_direct_xmit include/linux/netdevice.h:3431 [inline] packet_xmit+0x1b4/0x320 net/packet/af_packet.c:285 packet_snd net/packet/af_packet.c:3082 [inline] packet_sendmsg+0x3c81/0x4fb0 net/packet/af_packet.c:3114 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] __sys_sendto+0x672/0x710 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2268 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd6a99cdd9 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 ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd6b903028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcd6ac15fa0 RCX: 00007fcd6a99cdd9 RDX: 00000000000100a6 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007fcd6aa32d69 R08: 0000200000000140 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd6ac16038 R14: 00007fcd6ac15fa0 R15: 00007fff57a83608 *** 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.