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006d021491bc7-69998d0e2cemr1605172eaf.38.1778075310189; Wed, 06 May 2026 06:48:30 -0700 (PDT) Date: Wed, 06 May 2026 06:48:30 -0700 In-Reply-To: <69ea344f.a00a0220.17a17.0040.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69fb46ae.a00a0220.387fc1.0002.GAE@google.com> Subject: Re: [syzbot] [rdma] general protection fault in kernel_sock_shutdown (4) From: syzbot To: akpm@linux-foundation.org, arjan@linux.intel.com, davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, jgg@ziepe.ca, kuba@kernel.org, kuni1840@gmail.com, kuniyu@google.com, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, yanjun.zhu@linux.dev, zyjzyj2000@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 74fe02ce122a Merge tag 'wq-for-7.1-rc2-fixes' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16e895ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=59da38148f3a3d24 dashboard link: https://syzkaller.appspot.com/bug?extid=d8f76778263ab65c2b21 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a613ba580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-74fe02ce.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c0a591d96864/vmlinux-74fe02ce.xz kernel image: https://storage.googleapis.com/syzbot-assets/9f94fb623cd1/bzImage-74fe02ce.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 3 UID: 0 PID: 5986 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:kernel_sock_shutdown+0x47/0x70 net/socket.c:3785 Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 33 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 68 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 1a 49 8b 44 24 68 89 ee 48 89 df 5b 5d 41 5c ff e0 RSP: 0018:ffffc9000391f180 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88802a2a0040 RCX: ffffffff8b8b72bd RDX: 000000000000000d RSI: ffffffff89553b32 RDI: 0000000000000068 RBP: 0000000000000002 R08: 0000000000000001 R09: fffff52000723dfc R10: ffffc9000391efe7 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880311b8000 R14: 0000000000000002 R15: 0000000000000018 FS: 00007f602d1fe6c0(0000) GS:ffff8880d6675000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561c522a6000 CR3: 000000002e99e000 CR4: 0000000000352ef0 Call Trace: udp_tunnel_sock_release+0x68/0x80 net/ipv4/udp_tunnel_core.c:202 rxe_release_udp_tunnel drivers/infiniband/sw/rxe/rxe_net.c:294 [inline] rxe_sock_put+0xae/0x130 drivers/infiniband/sw/rxe/rxe_net.c:639 rxe_net_del+0x83/0x120 drivers/infiniband/sw/rxe/rxe_net.c:660 rxe_dellink+0x15/0x20 drivers/infiniband/sw/rxe/rxe.c:254 nldev_dellink+0x289/0x3c0 drivers/infiniband/core/nldev.c:1849 rdma_nl_rcv_msg+0x392/0x6f0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2cb/0x410 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752 __sys_sendmsg+0x170/0x220 net/socket.c:2784 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f602db9cdd9 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:00007f602d1fe028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f602de16090 RCX: 00007f602db9cdd9 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000007 RBP: 00007f602dc32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f602de16128 R14: 00007f602de16090 R15: 00007ffc1d89c428 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kernel_sock_shutdown+0x47/0x70 net/socket.c:3785 Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 33 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 68 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 1a 49 8b 44 24 68 89 ee 48 89 df 5b 5d 41 5c ff e0 RSP: 0018:ffffc9000391f180 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88802a2a0040 RCX: ffffffff8b8b72bd RDX: 000000000000000d RSI: ffffffff89553b32 RDI: 0000000000000068 RBP: 0000000000000002 R08: 0000000000000001 R09: fffff52000723dfc R10: ffffc9000391efe7 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880311b8000 R14: 0000000000000002 R15: 0000000000000018 FS: 00007f602d1fe6c0(0000) GS:ffff8880d6675000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561c522a6000 CR3: 000000002e99e000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: fc cld 1: ff lcall (bad) 2: df 48 89 fisttps -0x77(%rax) 5: fa cli 6: 48 c1 ea 03 shr $0x3,%rdx a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) e: 75 33 jne 0x43 10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 17: fc ff df 1a: 4c 8b 63 20 mov 0x20(%rbx),%r12 1e: 49 8d 7c 24 68 lea 0x68(%r12),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 1a jne 0x4a 30: 49 8b 44 24 68 mov 0x68(%r12),%rax 35: 89 ee mov %ebp,%esi 37: 48 89 df mov %rbx,%rdi 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: 41 5c pop %r12 3e: ff e0 jmp *%rax --- 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.