Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.223740] netlink: 8 bytes leftover after parsing attributes in process `syz-executor442'. [ 35.234183] sysfs: cannot create duplicate filename '/devices/virtual/bdi/43:0' [ 35.241952] CPU: 1 PID: 8110 Comm: syz-executor442 Not tainted 4.19.198-syzkaller #0 [ 35.249871] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.259208] Call Trace: [ 35.261783] dump_stack+0x1fc/0x2ef [ 35.265394] sysfs_warn_dup.cold+0x1c/0x29 [ 35.269614] sysfs_create_dir_ns+0x228/0x280 [ 35.274002] ? sysfs_create_mount_point+0xb0/0xb0 [ 35.278840] ? lock_acquire+0x170/0x3c0 [ 35.282798] ? kobject_add_internal+0x134/0x9c0 [ 35.287450] ? bdi_register_va.part.0+0x35/0x730 [ 35.292196] ? class_dir_child_ns_type+0x9/0x60 [ 35.296859] kobject_add_internal+0x2a5/0x9c0 [ 35.301341] kobject_add+0x150/0x1c0 [ 35.305038] ? kset_create_and_add+0x1a0/0x1a0 [ 35.309608] ? device_add+0x2c7/0x16d0 [ 35.313485] device_add+0x37b/0x16d0 [ 35.317178] ? device_check_offline+0x280/0x280 [ 35.321825] ? kfree_const+0x51/0x60 [ 35.325516] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 35.330515] ? kfree+0x1e2/0x210 [ 35.333878] device_create_groups_vargs+0x1f4/0x270 [ 35.338886] device_create_vargs+0x3a/0x50 [ 35.343133] bdi_register_va.part.0+0x35/0x730 [ 35.347711] bdi_register+0x12a/0x140 [ 35.351510] ? bdi_register_va+0x80/0x80 [ 35.355564] ? vsnprintf+0x2cc/0x14f0 [ 35.359365] bdi_register_owner+0x59/0x100 [ 35.363583] __device_add_disk+0xd58/0x10c0 [ 35.367904] ? sprintf+0xc0/0x100 [ 35.371339] ? blk_alloc_devt+0x2d0/0x2d0 [ 35.375467] ? __lockdep_init_map+0x100/0x5a0 [ 35.379941] ? __lockdep_init_map+0x100/0x5a0 [ 35.384416] nbd_dev_add+0x6a9/0x890 [ 35.388122] nbd_genl_connect+0x488/0x1630 [ 35.392338] ? printk+0xba/0xed [ 35.395620] ? nbd_xmit_timeout+0x730/0x730 [ 35.399936] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.404499] ? ___ratelimit+0x319/0x590 [ 35.408463] ? nla_parse+0x1e7/0x290 [ 35.412158] ? nla_parse+0x1b2/0x290 [ 35.415854] genl_family_rcv_msg+0x642/0xc40 [ 35.420246] ? genl_rcv+0x40/0x40 [ 35.423675] ? genl_rcv_msg+0x12f/0x160 [ 35.427629] ? mutex_trylock+0x1a0/0x1a0 [ 35.431673] ? __radix_tree_lookup+0x216/0x370 [ 35.436239] genl_rcv_msg+0xbf/0x160 [ 35.439932] netlink_rcv_skb+0x160/0x440 [ 35.443974] ? genl_family_rcv_msg+0xc40/0xc40 [ 35.448549] ? netlink_ack+0xae0/0xae0 [ 35.452438] ? genl_rcv+0x15/0x40 [ 35.455875] genl_rcv+0x24/0x40 [ 35.459137] netlink_unicast+0x4d5/0x690 [ 35.463184] ? netlink_sendskb+0x110/0x110 [ 35.467402] ? _copy_from_iter_full+0x229/0x7c0 [ 35.472109] ? __phys_addr_symbol+0x2c/0x70 [ 35.476432] ? __check_object_size+0x17b/0x3e0 [ 35.481036] netlink_sendmsg+0x6bb/0xc40 [ 35.485099] ? aa_af_perm+0x230/0x230 [ 35.489004] ? nlmsg_notify+0x1a0/0x1a0 [ 35.492963] ? kernel_recvmsg+0x220/0x220 [ 35.497097] ? nlmsg_notify+0x1a0/0x1a0 [ 35.501071] sock_sendmsg+0xc3/0x120 [ 35.504765] ___sys_sendmsg+0x7bb/0x8e0 [ 35.508733] ? copy_msghdr_from_user+0x440/0x440 [ 35.513466] ? netlink_dump+0xc10/0xc10 [ 35.517419] ? nlmsg_notify+0x1a0/0x1a0 [ 35.521565] ? security_socket_recvmsg+0x8f/0xc0 [ 35.526300] ? __sys_recvfrom+0x2cd/0x3a0 [ 35.530448] ? __ia32_sys_send+0x100/0x100 [ 35.534755] ? __fdget+0x1a0/0x230 [ 35.538288] __x64_sys_sendmsg+0x132/0x220 [ 35.542516] ? __sys_sendmsg+0x1b0/0x1b0 [ 35.546562] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.551911] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.556911] ? do_syscall_64+0x21/0x620 [ 35.560866] do_syscall_64+0xf9/0x620 [ 35.564663] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.569837] RIP: 0033:0x43fa49 [ 35.573011] 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 [ 35.591903] RSP: 002b:00007ffdb4946e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 35.599615] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa49 [ 35.606917] RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000004 [ 35.614218] RBP: 00000000004034b0 R08: 0000000000000000 R09: 00000000004004a0 [ 35.621471] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403540 [ 35.628743] R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 [ 35.637015] kobject_add_internal failed for 43:0 with -EEXIST, don't try to register things with the same name in the same directory. [ 35.649388] ------------[ cut here ]------------ [ 35.654562] WARNING: CPU: 1 PID: 8110 at block/genhd.c:719 __device_add_disk.cold+0x69/0x188 [ 35.663144] Kernel panic - not syncing: panic_on_warn set ... [ 35.663144] [ 35.670502] CPU: 1 PID: 8110 Comm: syz-executor442 Not tainted 4.19.198-syzkaller #0 [ 35.678377] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.687713] Call Trace: [ 35.690288] dump_stack+0x1fc/0x2ef [ 35.693898] panic+0x26a/0x50e [ 35.697082] ? __warn_printk+0xf3/0xf3 [ 35.700949] ? __device_add_disk.cold+0x69/0x188 [ 35.705708] ? __probe_kernel_read+0x130/0x1b0 [ 35.710277] ? __warn.cold+0x5/0x5a [ 35.713913] ? __warn+0xe4/0x200 [ 35.717271] ? __device_add_disk.cold+0x69/0x188 [ 35.722013] __warn.cold+0x20/0x5a [ 35.725549] ? __device_add_disk.cold+0x69/0x188 [ 35.730307] report_bug+0x262/0x2b0 [ 35.733928] do_error_trap+0x1d7/0x310 [ 35.737795] ? math_error+0x310/0x310 [ 35.741588] ? irq_work_claim+0xa6/0xc0 [ 35.745542] ? irq_work_queue+0x29/0x80 [ 35.749499] ? error_entry+0x72/0xd0 [ 35.753199] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.758196] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.763018] invalid_op+0x14/0x20 [ 35.766451] RIP: 0010:__device_add_disk.cold+0x69/0x188 [ 35.771808] Code: 02 84 c0 74 08 3c 03 0f 8e a8 00 00 00 44 8b a5 b8 05 00 00 e9 75 29 6b fb e8 13 bb 66 f9 48 c7 c7 20 72 b2 88 e8 1d 76 f7 ff <0f> 0b e9 9d 35 6b fb e8 fb ba 66 f9 48 c7 c7 20 72 b2 88 e8 05 76 [ 35.790703] RSP: 0018:ffff88809502f488 EFLAGS: 00010282 [ 35.796144] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 35.803392] RDX: 0000000000000000 RSI: ffffffff814dfcf1 RDI: ffffed1012a05e83 [ 35.810656] RBP: ffff888094c98140 R08: 0000000000000024 R09: 0000000000000000 [ 35.817905] R10: 0000000000000005 R11: 0000000000000000 R12: ffff888094c981d0 [ 35.825153] R13: ffff888094c98798 R14: 00000000ffffffef R15: ffff888094c98144 [ 35.832446] ? vprintk_func+0x81/0x180 [ 35.836582] ? __device_add_disk.cold+0x69/0x188 [ 35.841318] ? sprintf+0xc0/0x100 [ 35.844758] ? blk_alloc_devt+0x2d0/0x2d0 [ 35.848902] ? __lockdep_init_map+0x100/0x5a0 [ 35.853380] ? __lockdep_init_map+0x100/0x5a0 [ 35.857854] nbd_dev_add+0x6a9/0x890 [ 35.861551] nbd_genl_connect+0x488/0x1630 [ 35.865768] ? printk+0xba/0xed [ 35.869031] ? nbd_xmit_timeout+0x730/0x730 [ 35.873355] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.877918] ? ___ratelimit+0x319/0x590 [ 35.881916] ? nla_parse+0x1e7/0x290 [ 35.885619] ? nla_parse+0x1b2/0x290 [ 35.889382] genl_family_rcv_msg+0x642/0xc40 [ 35.893835] ? genl_rcv+0x40/0x40 [ 35.897275] ? genl_rcv_msg+0x12f/0x160 [ 35.901232] ? mutex_trylock+0x1a0/0x1a0 [ 35.905280] ? __radix_tree_lookup+0x216/0x370 [ 35.909848] genl_rcv_msg+0xbf/0x160 [ 35.913544] netlink_rcv_skb+0x160/0x440 [ 35.917609] ? genl_family_rcv_msg+0xc40/0xc40 [ 35.922189] ? netlink_ack+0xae0/0xae0 [ 35.926059] ? genl_rcv+0x15/0x40 [ 35.929506] genl_rcv+0x24/0x40 [ 35.932778] netlink_unicast+0x4d5/0x690 [ 35.936836] ? netlink_sendskb+0x110/0x110 [ 35.941070] ? _copy_from_iter_full+0x229/0x7c0 [ 35.945835] ? __phys_addr_symbol+0x2c/0x70 [ 35.950209] ? __check_object_size+0x17b/0x3e0 [ 35.954778] netlink_sendmsg+0x6bb/0xc40 [ 35.958830] ? aa_af_perm+0x230/0x230 [ 35.962615] ? nlmsg_notify+0x1a0/0x1a0 [ 35.966584] ? kernel_recvmsg+0x220/0x220 [ 35.970729] ? nlmsg_notify+0x1a0/0x1a0 [ 35.974695] sock_sendmsg+0xc3/0x120 [ 35.978404] ___sys_sendmsg+0x7bb/0x8e0 [ 35.978447] ? copy_msghdr_from_user+0x440/0x440 [ 35.978457] ? netlink_dump+0xc10/0xc10 [ 35.978471] ? nlmsg_notify+0x1a0/0x1a0 [ 35.978492] ? security_socket_recvmsg+0x8f/0xc0 [ 35.978509] ? __sys_recvfrom+0x2cd/0x3a0 [ 35.978520] ? __ia32_sys_send+0x100/0x100 [ 36.008209] ? __fdget+0x1a0/0x230 [ 36.011734] __x64_sys_sendmsg+0x132/0x220 [ 36.015952] ? __sys_sendmsg+0x1b0/0x1b0 [ 36.020009] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.025353] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.030347] ? do_syscall_64+0x21/0x620 [ 36.034301] do_syscall_64+0xf9/0x620 [ 36.038083] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.043273] RIP: 0033:0x43fa49 [ 36.046535] 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 [ 36.065417] RSP: 002b:00007ffdb4946e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 36.073113] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa49 [ 36.080361] RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000004 [ 36.087609] RBP: 00000000004034b0 R08: 0000000000000000 R09: 00000000004004a0 [ 36.094887] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403540 [ 36.102154] R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 [ 36.110823] Kernel Offset: disabled [ 36.114491] Rebooting in 86400 seconds..