Hello, syzbot found the following issue on: HEAD commit: 0dbcac3a6dbb Merge tag 'mlx5-fixes-2023-06-16' of git://gi.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=168647cf280000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec dashboard link: https://syzkaller.appspot.com/bug?extid=2da1965168e7dbcba136 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7a5b8a7805df/disk-0dbcac3a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7aea10826aef/vmlinux-0dbcac3a.xz kernel image: https://storage.googleapis.com/syzbot-assets/d2e6c04c44a8/bzImage-0dbcac3a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2da1965168e7dbcba136@xxxxxxxxxxxxxxxxxxxxxxxxx infiniband syz2: set active infiniband syz2: added wg2 general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 20166 Comm: syz-executor.2 Not tainted 6.4.0-rc6-syzkaller-00218-g0dbcac3a6dbb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:flush_send_queue drivers/infiniband/sw/rxe/rxe_comp.c:600 [inline] RIP: 0010:rxe_completer+0x25c7/0x3d80 drivers/infiniband/sw/rxe/rxe_comp.c:659 Code: 80 3c 02 00 0f 85 7e 10 00 00 4c 8b ad 88 03 00 00 49 8d 45 30 48 89 c2 48 89 04 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 80 11 00 00 49 8d 45 2c 45 8b RSP: 0018:ffffc90004ebe938 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffffed10087e4000 RCX: ffffc900103f7000 RDX: 0000000000000006 RSI: ffffffff877fcaf5 RDI: ffff888043f20388 RBP: ffff888043f20000 R08: 0000000000000000 R09: ffff888043f2055b R10: ffffed10087e40ab R11: 1ffffffff21a70e1 R12: 0000000000000246 R13: 0000000000000000 R14: ffff888043f201a0 R15: 0000000000000000 FS: 00007f94b8e21700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2db24000 CR3: 000000007e0d8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> rxe_qp_do_cleanup+0x1c1/0x820 drivers/infiniband/sw/rxe/rxe_qp.c:771 execute_in_process_context+0x3b/0x150 kernel/workqueue.c:3473 __rxe_cleanup+0x21e/0x370 drivers/infiniband/sw/rxe/rxe_pool.c:233 rxe_create_qp+0x3f6/0x5f0 drivers/infiniband/sw/rxe/rxe_verbs.c:583 create_qp+0x5ac/0x970 drivers/infiniband/core/verbs.c:1235 ib_create_qp_kernel+0xa1/0x310 drivers/infiniband/core/verbs.c:1346 ib_create_qp include/rdma/ib_verbs.h:3743 [inline] create_mad_qp+0x177/0x380 drivers/infiniband/core/mad.c:2905 ib_mad_port_open drivers/infiniband/core/mad.c:2986 [inline] ib_mad_init_device+0xf40/0x1a90 drivers/infiniband/core/mad.c:3077 add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:721 enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1332 ib_register_device drivers/infiniband/core/device.c:1420 [inline] ib_register_device+0x8b1/0xbc0 drivers/infiniband/core/device.c:1366 rxe_register_device+0x302/0x3e0 drivers/infiniband/sw/rxe/rxe_verbs.c:1486 rxe_net_add+0x90/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:534 rxe_newlink+0xf0/0x1b0 drivers/infiniband/sw/rxe/rxe.c:197 nldev_newlink+0x332/0x5e0 drivers/infiniband/core/nldev.c:1731 rdma_nl_rcv_msg+0x371/0x6a0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2fc/0x440 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f94b808c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f94b8e21168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f94b81abf80 RCX: 00007f94b808c389 RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 00007f94b80d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe6f1226cf R14: 00007f94b8e21300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:flush_send_queue drivers/infiniband/sw/rxe/rxe_comp.c:600 [inline] RIP: 0010:rxe_completer+0x25c7/0x3d80 drivers/infiniband/sw/rxe/rxe_comp.c:659 Code: 80 3c 02 00 0f 85 7e 10 00 00 4c 8b ad 88 03 00 00 49 8d 45 30 48 89 c2 48 89 04 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 80 11 00 00 49 8d 45 2c 45 8b RSP: 0018:ffffc90004ebe938 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffffed10087e4000 RCX: ffffc900103f7000 RDX: 0000000000000006 RSI: ffffffff877fcaf5 RDI: ffff888043f20388 RBP: ffff888043f20000 R08: 0000000000000000 R09: ffff888043f2055b R10: ffffed10087e40ab R11: 1ffffffff21a70e1 R12: 0000000000000246 R13: 0000000000000000 R14: ffff888043f201a0 R15: 0000000000000000 FS: 00007f94b8e21700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2db24000 CR3: 000000007e0d8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 0f 85 7e 10 00 00 jne 0x1088 a: 4c 8b ad 88 03 00 00 mov 0x388(%rbp),%r13 11: 49 8d 45 30 lea 0x30(%r13),%rax 15: 48 89 c2 mov %rax,%rdx 18: 48 89 04 24 mov %rax,(%rsp) 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e 80 11 00 00 jle 0x11ba 3a: 49 8d 45 2c lea 0x2c(%r13),%rax 3e: 45 rex.RB 3f: 8b .byte 0x8b --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
