RBP: 0000000000403500 R08: 0000000000000000 R09: 00000000004004a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403590 R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 kobject_add_internal failed for 43:256 with -EEXIST, don't try to register things with the same name in the same directory. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8074 at block/genhd.c:719 __device_add_disk.cold+0x69/0x188 block/genhd.c:719 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8074 Comm: syz-executor975 Not tainted 4.19.191-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:__device_add_disk.cold+0x69/0x188 block/genhd.c:719 Code: 02 84 c0 74 08 3c 03 0f 8e a8 00 00 00 44 8b a5 b8 05 00 00 e9 12 a6 6b fb e8 a0 58 67 f9 48 c7 c7 60 6f b2 88 e8 dd 74 f7 ff <0f> 0b e9 3a b2 6b fb e8 88 58 67 f9 48 c7 c7 60 6f b2 88 e8 c5 74 RSP: 0018:ffff8880911d7488 EFLAGS: 00010282 RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814df3b1 RDI: ffffed101223ae83 RBP: ffff88809f6b1740 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809f6b17d0 R13: ffff88809f6b1d98 R14: 00000000ffffffef R15: ffff88809f6b1744 add_disk include/linux/genhd.h:409 [inline] nbd_dev_add+0x6a9/0x890 drivers/block/nbd.c:1692 nbd_genl_connect+0x488/0x1630 drivers/block/nbd.c:1784 genl_family_rcv_msg+0x642/0xc40 net/netlink/genetlink.c:602 genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43fa99 Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe09cd2ba8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa99 RDX: 0000000020008000 RSI: 0000000020000400 RDI: 0000000000000003 RBP: 0000000000403500 R08: 0000000000000000 R09: 00000000004004a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403590 R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 Kernel Offset: disabled Rebooting in 86400 seconds..