Warning: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.433926] sysfs: cannot create duplicate filename '/devices/virtual/bdi/43:0' [ 36.441677] CPU: 0 PID: 8086 Comm: syz-executor732 Not tainted 4.19.180-syzkaller #0 [ 36.449760] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.459216] Call Trace: [ 36.461801] dump_stack+0x1fc/0x2ef [ 36.465416] sysfs_warn_dup.cold+0x1c/0x29 [ 36.469741] sysfs_create_dir_ns+0x228/0x280 [ 36.474134] ? sysfs_create_mount_point+0xb0/0xb0 [ 36.479088] ? lock_acquire+0x170/0x3c0 [ 36.483053] ? kobject_add_internal+0x134/0x9c0 [ 36.487742] ? bdi_register_va.part.0+0x35/0x730 [ 36.492494] ? class_dir_child_ns_type+0x9/0x60 [ 36.497560] kobject_add_internal+0x2a5/0x9c0 [ 36.502065] kobject_add+0x150/0x1c0 [ 36.505778] ? kset_create_and_add+0x1a0/0x1a0 [ 36.510354] ? device_add+0x2c7/0x16d0 [ 36.514233] device_add+0x37b/0x16d0 [ 36.517936] ? device_check_offline+0x280/0x280 [ 36.522618] ? kfree_const+0x51/0x60 [ 36.526315] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 36.531330] ? kfree+0x1e2/0x210 [ 36.534682] device_create_groups_vargs+0x1f4/0x270 [ 36.539919] device_create_vargs+0x3a/0x50 [ 36.544176] bdi_register_va.part.0+0x35/0x730 [ 36.548753] bdi_register+0x12a/0x140 [ 36.552548] ? bdi_register_va+0x80/0x80 [ 36.556600] ? vsnprintf+0x2cc/0x14f0 [ 36.560427] bdi_register_owner+0x59/0x100 [ 36.564671] __device_add_disk+0xd58/0x1110 [ 36.569030] ? sprintf+0xc0/0x100 [ 36.572473] ? blk_alloc_devt+0x2d0/0x2d0 [ 36.576609] ? __lockdep_init_map+0x100/0x5a0 [ 36.581112] ? __lockdep_init_map+0x100/0x5a0 [ 36.585813] nbd_dev_add+0x6a9/0x890 [ 36.589616] nbd_genl_connect+0x488/0x1630 [ 36.593958] ? nbd_xmit_timeout+0x730/0x730 [ 36.598296] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 36.603494] ? validate_nla+0x270/0x820 [ 36.607546] ? nla_parse+0x1b2/0x290 [ 36.611263] genl_family_rcv_msg+0x642/0xc40 [ 36.615658] ? genl_rcv+0x40/0x40 [ 36.619099] ? genl_rcv_msg+0x12f/0x160 [ 36.623060] ? __mutex_add_waiter+0x160/0x160 [ 36.627736] ? __radix_tree_lookup+0x216/0x370 [ 36.632320] genl_rcv_msg+0xbf/0x160 [ 36.636023] netlink_rcv_skb+0x160/0x440 [ 36.640114] ? genl_family_rcv_msg+0xc40/0xc40 [ 36.644703] ? netlink_ack+0xae0/0xae0 [ 36.648583] ? genl_rcv+0x15/0x40 [ 36.652026] genl_rcv+0x24/0x40 [ 36.655662] netlink_unicast+0x4d5/0x690 [ 36.659749] ? netlink_sendskb+0x110/0x110 [ 36.664135] ? _copy_from_iter_full+0x229/0x7c0 [ 36.668927] ? __phys_addr_symbol+0x2c/0x70 [ 36.673254] ? __check_object_size+0x17b/0x3e0 [ 36.679046] netlink_sendmsg+0x6bb/0xc40 [ 36.683255] ? aa_af_perm+0x230/0x230 [ 36.687295] ? nlmsg_notify+0x1a0/0x1a0 [ 36.691269] ? kernel_recvmsg+0x220/0x220 [ 36.695442] ? nlmsg_notify+0x1a0/0x1a0 [ 36.699509] sock_sendmsg+0xc3/0x120 [ 36.703216] ___sys_sendmsg+0x7bb/0x8e0 [ 36.707187] ? copy_msghdr_from_user+0x440/0x440 [ 36.712368] ? netlink_dump+0xc10/0xc10 [ 36.716359] ? nlmsg_notify+0x1a0/0x1a0 [ 36.720327] ? security_socket_recvmsg+0x8f/0xc0 [ 36.725071] ? __sys_recvfrom+0x2cd/0x3a0 [ 36.729228] ? __ia32_sys_send+0x100/0x100 [ 36.733464] ? __fdget+0x1a0/0x230 [ 36.737029] __x64_sys_sendmsg+0x132/0x220 [ 36.741313] ? __sys_sendmsg+0x1b0/0x1b0 [ 36.745375] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.750734] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.755771] ? do_syscall_64+0x21/0x620 [ 36.759870] do_syscall_64+0xf9/0x620 [ 36.763663] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.769100] RIP: 0033:0x43f9a9 [ 36.772327] 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 [ 36.791410] RSP: 002b:00007ffe387834f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 36.799215] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043f9a9 [ 36.806474] RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 [ 36.813864] RBP: 0000000000403410 R08: 0000000000000000 R09: 00000000004004a0 [ 36.821558] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004034a0 [ 36.828817] R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 [ 36.836741] kobject_add_internal failed for 43:0 with -EEXIST, don't try to register things with the same name in the same directory. [ 36.849131] ------------[ cut here ]------------ [ 36.854251] WARNING: CPU: 0 PID: 8086 at block/genhd.c:721 __device_add_disk.cold+0x17a/0x181 [ 36.863093] Kernel panic - not syncing: panic_on_warn set ... [ 36.863093] [ 36.870551] CPU: 0 PID: 8086 Comm: syz-executor732 Not tainted 4.19.180-syzkaller #0 [ 36.879477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.888858] Call Trace: [ 36.891452] dump_stack+0x1fc/0x2ef [ 36.895082] panic+0x26a/0x50e [ 36.898261] ? __warn_printk+0xf3/0xf3 [ 36.902154] ? __device_add_disk.cold+0x17a/0x181 [ 36.907174] ? __probe_kernel_read+0x130/0x1b0 [ 36.911914] ? __warn.cold+0x5/0x5a [ 36.915536] ? __warn+0xe4/0x200 [ 36.918984] ? __device_add_disk.cold+0x17a/0x181 [ 36.923823] __warn.cold+0x20/0x5a [ 36.927351] ? __device_add_disk.cold+0x17a/0x181 [ 36.932192] report_bug+0x262/0x2b0 [ 36.935831] do_error_trap+0x1d7/0x310 [ 36.939706] ? math_error+0x310/0x310 [ 36.943518] ? irq_work_claim+0xa6/0xc0 [ 36.947601] ? irq_work_queue+0x29/0x80 [ 36.951579] ? error_entry+0x72/0xd0 [ 36.955326] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.960342] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.965172] invalid_op+0x14/0x20 [ 36.968895] RIP: 0010:__device_add_disk.cold+0x17a/0x181 [ 36.974376] Code: fb e8 e0 d2 68 f9 48 c7 c7 60 55 b2 88 e8 ce 78 f7 ff 0f 0b e9 82 0a 6c fb e8 c8 d2 68 f9 48 c7 c7 60 55 b2 88 e8 b6 78 f7 ff <0f> 0b e9 e2 11 6c fb e8 b0 d2 68 f9 be 00 01 00 00 bb 00 01 00 00 [ 36.993267] RSP: 0018:ffff888090ae7488 EFLAGS: 00010282 [ 36.998626] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 37.006006] RDX: 0000000000000000 RSI: ffffffff814de3d1 RDI: ffffed101215ce83 [ 37.013372] RBP: ffff8880b2b7a640 R08: 0000000000000024 R09: 0000000000000000 [ 37.020722] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b2b7a6d0 [ 37.027982] R13: ffff8880b2b7ac98 R14: 00000000ffffffef R15: ffff8880b2b7a644 [ 37.035334] ? vprintk_func+0x81/0x180 [ 37.039375] ? __device_add_disk.cold+0x17a/0x181 [ 37.044544] ? sprintf+0xc0/0x100 [ 37.047995] ? blk_alloc_devt+0x2d0/0x2d0 [ 37.052273] ? __lockdep_init_map+0x100/0x5a0 [ 37.056773] ? __lockdep_init_map+0x100/0x5a0 [ 37.061272] nbd_dev_add+0x6a9/0x890 [ 37.065067] nbd_genl_connect+0x488/0x1630 [ 37.069310] ? nbd_xmit_timeout+0x730/0x730 [ 37.073630] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 37.078895] ? validate_nla+0x270/0x820 [ 37.082861] ? nla_parse+0x1b2/0x290 [ 37.086582] genl_family_rcv_msg+0x642/0xc40 [ 37.091070] ? genl_rcv+0x40/0x40 [ 37.094593] ? genl_rcv_msg+0x12f/0x160 [ 37.098562] ? __mutex_add_waiter+0x160/0x160 [ 37.103240] ? __radix_tree_lookup+0x216/0x370 [ 37.109766] genl_rcv_msg+0xbf/0x160 [ 37.113513] netlink_rcv_skb+0x160/0x440 [ 37.117569] ? genl_family_rcv_msg+0xc40/0xc40 [ 37.122309] ? netlink_ack+0xae0/0xae0 [ 37.126346] ? genl_rcv+0x15/0x40 [ 37.129817] genl_rcv+0x24/0x40 [ 37.133970] netlink_unicast+0x4d5/0x690 [ 37.138044] ? netlink_sendskb+0x110/0x110 [ 37.142268] ? _copy_from_iter_full+0x229/0x7c0 [ 37.147625] ? __phys_addr_symbol+0x2c/0x70 [ 37.151966] ? __check_object_size+0x17b/0x3e0 [ 37.156977] netlink_sendmsg+0x6bb/0xc40 [ 37.161044] ? aa_af_perm+0x230/0x230 [ 37.164855] ? nlmsg_notify+0x1a0/0x1a0 [ 37.168821] ? kernel_recvmsg+0x220/0x220 [ 37.172959] ? nlmsg_notify+0x1a0/0x1a0 [ 37.176920] sock_sendmsg+0xc3/0x120 [ 37.180632] ___sys_sendmsg+0x7bb/0x8e0 [ 37.184606] ? copy_msghdr_from_user+0x440/0x440 [ 37.189367] ? netlink_dump+0xc10/0xc10 [ 37.193330] ? nlmsg_notify+0x1a0/0x1a0 [ 37.197309] ? security_socket_recvmsg+0x8f/0xc0 [ 37.202063] ? __sys_recvfrom+0x2cd/0x3a0 [ 37.206196] ? __ia32_sys_send+0x100/0x100 [ 37.210535] ? __fdget+0x1a0/0x230 [ 37.214163] __x64_sys_sendmsg+0x132/0x220 [ 37.218518] ? __sys_sendmsg+0x1b0/0x1b0 [ 37.222574] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.228194] ? trace_hardirqs_off_caller+0x6e/0x210 [ 37.233207] ? do_syscall_64+0x21/0x620 [ 37.237432] do_syscall_64+0xf9/0x620 [ 37.241238] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.246426] RIP: 0033:0x43f9a9 [ 37.249603] 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 [ 37.268494] RSP: 002b:00007ffe387834f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 37.276277] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043f9a9 [ 37.283557] RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 [ 37.292252] RBP: 0000000000403410 R08: 0000000000000000 R09: 00000000004004a0 [ 37.299526] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004034a0 [ 37.307484] R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 [ 37.315897] Kernel Offset: disabled [ 37.319566] Rebooting in 86400 seconds..