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e9e14a558f8ab-39c476977d9mr637255ab.0.1723492144182; Mon, 12 Aug 2024 12:49:04 -0700 (PDT) Date: Mon, 12 Aug 2024 12:49:04 -0700 In-Reply-To: <20240812092841.3289430-1-lizhi.xu@windriver.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000007070d061f81c9b6@google.com> Subject: Re: [syzbot] [net?] [s390?] general protection fault in smc_diag_dump_proto From: syzbot To: linux-kernel@vger.kernel.org, lizhi.xu@windriver.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in smc_diag_dump_proto Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 6159 Comm: syz.0.21 Not tainted 6.10.0-syzkaller-09703-gd7e78951a8b8-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline] RIP: 0010:__smc_diag_dump net/smc/smc_diag.c:89 [inline] RIP: 0010:smc_diag_dump_proto+0x709/0x3270 net/smc/smc_diag.c:217 Code: 08 48 89 df e8 f8 0d 9d f6 48 8b 44 24 28 4c 8d 68 14 48 8b 1b 48 83 c3 0e 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 0f b6 04 38 84 c0 0f 85 46 1b 00 00 0f b7 1b 66 c1 c3 08 4c 89 RSP: 0018:ffffc9000358eb00 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000e RCX: ffff888069659e00 RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000 RBP: ffffc9000358ef90 R08: ffffffff8990c562 R09: 1ffff1100eef084b R10: dffffc0000000000 R11: ffffed100eef084c R12: 1ffff1100eef08e0 R13: ffff8880777f0014 R14: ffff888077784200 R15: dffffc0000000000 FS: 00007fddae9ea6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddae9e9fa8 CR3: 00000000736f2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smc_diag_dump+0x59/0xa0 net/smc/smc_diag.c:236 netlink_dump+0x647/0xd80 net/netlink/af_netlink.c:2325 __netlink_dump_start+0x59f/0x780 net/netlink/af_netlink.c:2440 netlink_dump_start include/linux/netlink.h:339 [inline] smc_diag_handler_dump+0x1ab/0x250 net/smc/smc_diag.c:251 sock_diag_rcv_msg+0x3dc/0x5f0 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_sendmsg+0x134/0x200 net/socket.c:768 splice_to_socket+0xa13/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd77/0x1900 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fddadb75f19 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:00007fddae9ea048 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fddadd06038 RCX: 00007fddadb75f19 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fddadbe4e68 R08: 0000000080000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fddadd06038 R15: 00007ffc243501f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline] RIP: 0010:__smc_diag_dump net/smc/smc_diag.c:89 [inline] RIP: 0010:smc_diag_dump_proto+0x709/0x3270 net/smc/smc_diag.c:217 Code: 08 48 89 df e8 f8 0d 9d f6 48 8b 44 24 28 4c 8d 68 14 48 8b 1b 48 83 c3 0e 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 0f b6 04 38 84 c0 0f 85 46 1b 00 00 0f b7 1b 66 c1 c3 08 4c 89 RSP: 0018:ffffc9000358eb00 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000e RCX: ffff888069659e00 RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000 RBP: ffffc9000358ef90 R08: ffffffff8990c562 R09: 1ffff1100eef084b R10: dffffc0000000000 R11: ffffed100eef084c R12: 1ffff1100eef08e0 R13: ffff8880777f0014 R14: ffff888077784200 R15: dffffc0000000000 FS: 00007fddae9ea6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddae9e9fa8 CR3: 00000000736f2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 48 89 or %cl,-0x77(%rax) 3: df e8 fucomip %st(0),%st 5: f8 clc 6: 0d 9d f6 48 8b or $0x8b48f69d,%eax b: 44 24 28 rex.R and $0x28,%al e: 4c 8d 68 14 lea 0x14(%rax),%r13 12: 48 8b 1b mov (%rbx),%rbx 15: 48 83 c3 0e add $0xe,%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 27: fc ff df * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 46 1b 00 00 jne 0x1b7d 37: 0f b7 1b movzwl (%rbx),%ebx 3a: 66 c1 c3 08 rol $0x8,%bx 3e: 4c rex.WR 3f: 89 .byte 0x89 Tested on: commit: d7e78951 Merge tag 'net-6.11-rc0' of git://git.kernel... git tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=137931c5980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a6f4e2cb79bdcd45 dashboard link: https://syzkaller.appspot.com/bug?extid=f69bfae0a4eb29976e44 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1363c96d980000