Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 UID: 0 PID: 6234 Comm: syz.4.223 Not tainted 6.11.0-rc5-syzkaller-00079-g928f79a188aa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline] RIP: 0010:__smc_diag_dump.constprop.0+0x401/0x23d0 net/smc/smc_diag.c:89 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f1 1d 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 76 18 49 8d 7e 0e 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 8a RSP: 0018:ffffc9000487ef28 EFLAGS: 00010213 RAX: dffffc0000000000 RBX: ffff888041750000 RCX: ffffc9000a28e000 RDX: 0000000000000001 RSI: ffffffff8ab8e0e9 RDI: 000000000000000e RBP: ffff88807d5d8000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000001 R11: ffffffff93d26280 R12: ffff8880605d5590 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888041750500 FS: 00007f7a39bff6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef0506f78 CR3: 000000005db74000 CR4: 0000000000350ef0 Call Trace: smc_diag_dump_proto+0x26d/0x420 net/smc/smc_diag.c:217 smc_diag_dump+0x84/0x90 net/smc/smc_diag.c:236 netlink_dump+0x555/0xcc0 net/netlink/af_netlink.c:2325 __netlink_dump_start+0x6ca/0x970 net/netlink/af_netlink.c:2440 netlink_dump_start include/linux/netlink.h:339 [inline] smc_diag_handler_dump+0x1fb/0x240 net/smc/smc_diag.c:251 __sock_diag_cmd net/core/sock_diag.c:249 [inline] sock_diag_rcv_msg+0x43a/0x790 net/core/sock_diag.c:287 netlink_rcv_skb+0x16e/0x440 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x53f/0x7f0 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_sendmsg+0x3ce/0x470 net/socket.c:768 splice_to_socket+0xab2/0x1040 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0x148f/0x1f90 fs/splice.c:1354 __do_splice+0x327/0x360 fs/splice.c:1436 __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice fs/splice.c:1634 [inline] __x64_sys_splice+0x1d2/0x260 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7a38d79ef9 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:00007f7a39bff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f7a38f16058 RCX: 00007f7a38d79ef9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f7a38de793e R08: 0000000080000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7a38f16058 R15: 00007fff71e33248 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.constprop.0+0x401/0x23d0 net/smc/smc_diag.c:89 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f1 1d 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 76 18 49 8d 7e 0e 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 8a RSP: 0018:ffffc9000487ef28 EFLAGS: 00010213 RAX: dffffc0000000000 RBX: ffff888041750000 RCX: ffffc9000a28e000 RDX: 0000000000000001 RSI: ffffffff8ab8e0e9 RDI: 000000000000000e RBP: ffff88807d5d8000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000001 R11: ffffffff93d26280 R12: ffff8880605d5590 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888041750500 FS: 00007f7a39bff6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef0506f78 CR3: 000000005db74000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 48 89 fa mov %rdi,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 f1 1d 00 00 jne 0x1e02 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 4d 8b 76 18 mov 0x18(%r14),%r14 1f: 49 8d 7e 0e lea 0xe(%r14),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 01 add $0x1,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 8a .byte 0x8a