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AKwUvBz0Ao0DExtTdfzBq+L8y13P7CJWjEGdxO6STrEhcySQfaJyVLfm4HQvBIS5jhG8SfuD09hJQleLLo+Xpac=@vger.kernel.org X-Gm-Message-State: AFuF++mb5f79p60O6b6YLETOdVAfOUpSJw1QtSUbgRzvSYwJJFHDNDNF uQfZjlwaTGzcwjNRMFTFykUhU53x7RQxYfZFpqDjHZK1JYB0q1/8wvp6sYPmj7MVevS8XX+zwIE bUkDjAvorZgAInTEoLCyQD5+meT6i0mgKvHxrITMu/BxM4WJpyds65olzTvI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b0e:b0:6b8:ef7d:e17e with SMTP id 006d021491bc7-6c0bcbb6772mr452238eaf.51.1789073074993; Thu, 10 Sep 2026 13:44:34 -0700 (PDT) Date: Thu, 10 Sep 2026 13:44:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa316b2.f81106d8.2ab401.0014.GAE@google.com> Subject: [syzbot] [net?] BUG: using smp_processor_id() in preemptible code in sk_skb_reason_drop From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, nhorman@tuxdriver.com, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1545c871580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30 dashboard link: https://syzkaller.appspot.com/bug?extid=dc57fd6722deb17e92af compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f6fe01580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17ab2c8e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7171282977df/disk-50d05c7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/eb180d9b54d5/vmlinux-50d05c7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/ff1f279b8f9e/bzImage-50d05c7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dc57fd6722deb17e92af@syzkaller.appspotmail.com BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor/5601 caller is net_dm_packet_trace_kfree_skb_hit+0xdf/0x350 net/core/drop_monitor.c:519 CPU: 0 UID: 0 PID: 5601 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 check_preemption_disabled+0xcd/0xd0 lib/smp_processor_id.c:47 net_dm_packet_trace_kfree_skb_hit+0xdf/0x350 net/core/drop_monitor.c:519 __do_trace_kfree_skb include/trace/events/skb.h:24 [inline] trace_kfree_skb+0x1d1/0x210 include/trace/events/skb.h:24 __sk_skb_reason_drop net/core/skbuff.c:1231 [inline] sk_skb_reason_drop+0xdd/0x110 net/core/skbuff.c:1249 tcp_data_queue+0xb80/0x5fa0 net/ipv4/tcp_input.c:5709 tcp_rcv_established+0xe45/0x2910 net/ipv4/tcp_input.c:6689 tcp_v4_do_rcv+0x959/0x13f0 net/ipv4/tcp_ipv4.c:1854 sk_backlog_rcv include/net/sock.h:1192 [inline] __release_sock+0x28e/0x3d0 net/core/sock.c:3263 release_sock+0x1be/0x290 net/core/sock.c:3862 tcp_recvmsg+0x106/0x540 net/ipv4/tcp.c:2946 sock_recvmsg_nosec net/socket.c:1153 [inline] sock_recvmsg+0x166/0x1e0 net/socket.c:1173 sock_read_iter+0x233/0x300 net/socket.c:1242 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x59e/0xa90 fs/read_write.c:574 ksys_read+0x156/0x270 fs/read_write.c:716 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: 0033:0x7f32ab5392d7 Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffceb322d90 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000555568ab5540 RCX: 00007f32ab5392d7 RDX: 0000000000000004 RSI: 00007ffceb322dec RDI: 0000000000000003 RBP: 00007ffceb323290 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 R13: 00007ffceb322dec R14: 00007ffceb322e80 R15: 0000000000000000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup