[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.187' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.594927] sysfs: cannot create duplicate filename '/devices/virtual/bdi/43:0' [ 33.602428] CPU: 0 PID: 8102 Comm: syz-executor242 Not tainted 4.19.211-syzkaller #0 [ 33.610309] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 33.619641] Call Trace: [ 33.622213] dump_stack+0x1fc/0x2ef [ 33.625822] sysfs_warn_dup.cold+0x1c/0x29 [ 33.630126] sysfs_create_dir_ns+0x228/0x280 [ 33.634517] ? sysfs_create_mount_point+0xb0/0xb0 [ 33.639340] ? lock_acquire+0x170/0x3c0 [ 33.643299] ? kobject_add_internal+0x134/0x9c0 [ 33.647961] ? ___sys_sendmsg+0x7bb/0x8e0 [ 33.652095] ? class_dir_child_ns_type+0x9/0x60 [ 33.656747] kobject_add_internal+0x2a5/0x9c0 [ 33.661228] kobject_add+0x150/0x1c0 [ 33.664924] ? kset_create_and_add+0x1a0/0x1a0 [ 33.669494] ? device_add+0x2c7/0x16d0 [ 33.673363] device_add+0x37b/0x16d0 [ 33.677070] ? device_check_offline+0x280/0x280 [ 33.681719] ? kfree_const+0x51/0x60 [ 33.685417] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 33.690413] ? kfree+0x1e2/0x210 [ 33.693937] device_create_groups_vargs+0x1f4/0x270 [ 33.698936] device_create+0xdf/0x120 [ 33.702718] ? device_create_vargs+0x50/0x50 [ 33.707110] ? pointer+0x850/0x850 [ 33.710634] bdi_register_va.part.0+0x4c/0x750 [ 33.715197] bdi_register+0x12a/0x140 [ 33.718981] ? bdi_register_va+0x80/0x80 [ 33.723025] ? vsnprintf+0x2cc/0x14f0 [ 33.726813] bdi_register_owner+0x59/0x100 [ 33.731032] __device_add_disk+0xd58/0x10c0 [ 33.735859] ? sprintf+0xc0/0x100 [ 33.739317] ? blk_alloc_devt+0x2d0/0x2d0 [ 33.743460] ? __lockdep_init_map+0x100/0x5a0 [ 33.747941] ? __lockdep_init_map+0x100/0x5a0 [ 33.752441] nbd_dev_add+0x6a9/0x890 [ 33.756141] nbd_genl_connect+0x488/0x1630 [ 33.760369] ? nbd_xmit_timeout+0x730/0x730 [ 33.764671] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 33.769842] ? validate_nla+0x270/0x820 [ 33.773806] ? nla_parse+0x1b2/0x290 [ 33.777509] genl_family_rcv_msg+0x642/0xc40 [ 33.781901] ? genl_rcv+0x40/0x40 [ 33.785332] ? genl_rcv_msg+0x12f/0x160 [ 33.789287] ? mutex_trylock+0x1a0/0x1a0 [ 33.793335] ? __radix_tree_lookup+0x216/0x370 [ 33.797902] genl_rcv_msg+0xbf/0x160 [ 33.801623] netlink_rcv_skb+0x160/0x440 [ 33.805689] ? genl_family_rcv_msg+0xc40/0xc40 [ 33.810365] ? netlink_ack+0xae0/0xae0 [ 33.814243] ? genl_rcv+0x15/0x40 [ 33.817684] genl_rcv+0x24/0x40 [ 33.820948] netlink_unicast+0x4d5/0x690 [ 33.824991] ? netlink_sendskb+0x110/0x110 [ 33.829294] ? _copy_from_iter_full+0x229/0x7c0 [ 33.833950] ? __phys_addr_symbol+0x2c/0x70 [ 33.838262] ? __check_object_size+0x17b/0x3e0 [ 33.842830] netlink_sendmsg+0x6c3/0xc50 [ 33.846874] ? aa_af_perm+0x230/0x230 [ 33.850657] ? nlmsg_notify+0x1f0/0x1f0 [ 33.854614] ? kernel_recvmsg+0x220/0x220 [ 33.858747] ? nlmsg_notify+0x1f0/0x1f0 [ 33.862717] sock_sendmsg+0xc3/0x120 [ 33.866437] ___sys_sendmsg+0x7bb/0x8e0 [ 33.870419] ? copy_msghdr_from_user+0x440/0x440 [ 33.875172] ? netlink_dump+0xc10/0xc10 [ 33.879133] ? nlmsg_notify+0x1f0/0x1f0 [ 33.883096] ? security_socket_recvmsg+0x8f/0xc0 [ 33.887833] ? __sys_recvfrom+0x2cd/0x3a0 [ 33.891963] ? __ia32_sys_send+0x100/0x100 [ 33.896184] ? __fdget+0x1a0/0x230 [ 33.899794] __x64_sys_sendmsg+0x132/0x220 [ 33.904006] ? __sys_sendmsg+0x1b0/0x1b0 [ 33.908053] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.913404] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.918402] ? do_syscall_64+0x21/0x620 [ 33.922358] do_syscall_64+0xf9/0x620 [ 33.926146] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.931347] RIP: 0033:0x7fdfad73cb79 [ 33.935046] 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 [ 33.953933] RSP: 002b:00007ffe6c4118b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 33.961632] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdfad73cb79 [ 33.968914] RDX: 0000000004000010 RSI: 00000000200001c0 RDI: 0000000000000004 [ 33.976168] RBP: 00007fdfad7005e0 R08: 0000000000000000 R09: 0000000000000000 [ 33.983419] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdfad700670 [ 33.990668] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.998459] kobject_add_internal failed for 43:0 with -EEXIST, don't try to register things with the same name in the same directory. [ 34.010809] ------------[ cut here ]------------ [ 34.015951] WARNING: CPU: 0 PID: 8102 at block/genhd.c:719 __device_add_disk.cold+0x69/0x188 [ 34.024529] Kernel panic - not syncing: panic_on_warn set ... [ 34.024529] [ 34.031975] CPU: 0 PID: 8102 Comm: syz-executor242 Not tainted 4.19.211-syzkaller #0 [ 34.039835] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 34.049166] Call Trace: [ 34.051825] dump_stack+0x1fc/0x2ef [ 34.055444] panic+0x26a/0x50e [ 34.058626] ? __warn_printk+0xf3/0xf3 [ 34.062502] ? __device_add_disk.cold+0x69/0x188 [ 34.067240] ? __probe_kernel_read+0x130/0x1b0 [ 34.071807] ? __warn.cold+0x5/0x5a [ 34.075420] ? __warn+0xe4/0x200 [ 34.078765] ? __device_add_disk.cold+0x69/0x188 [ 34.083499] __warn.cold+0x20/0x5a [ 34.087019] ? __device_add_disk.cold+0x69/0x188 [ 34.091757] report_bug+0x262/0x2b0 [ 34.095366] do_error_trap+0x1d7/0x310 [ 34.099235] ? math_error+0x310/0x310 [ 34.103023] ? __irq_work_queue_local+0x101/0x160 [ 34.107846] ? irq_work_queue+0x29/0x80 [ 34.111804] ? error_entry+0x72/0xd0 [ 34.115504] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.120502] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.125331] invalid_op+0x14/0x20 [ 34.128788] RIP: 0010:__device_add_disk.cold+0x69/0x188 [ 34.134139] Code: 02 84 c0 74 08 3c 03 0f 8e a8 00 00 00 44 8b a5 f0 05 00 00 e9 67 ad 6a fb e8 05 45 66 f9 48 c7 c7 60 75 b2 88 e8 64 76 f7 ff <0f> 0b e9 8f b9 6a fb e8 ed 44 66 f9 48 c7 c7 60 75 b2 88 e8 4c 76 [ 34.153021] RSP: 0018:ffff8880953a7488 EFLAGS: 00010282 [ 34.158362] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 34.165610] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012a74e83 [ 34.172869] RBP: ffff8880b14b8580 R08: 0000000000000024 R09: 0000000000000000 [ 34.180145] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b14b8610 [ 34.187400] R13: ffff8880b14b8c10 R14: 00000000ffffffef R15: ffff8880b14b8584 [ 34.194669] ? vprintk_func+0x81/0x180 [ 34.198574] ? __device_add_disk.cold+0x69/0x188 [ 34.203316] ? sprintf+0xc0/0x100 [ 34.206751] ? blk_alloc_devt+0x2d0/0x2d0 [ 34.210883] ? __lockdep_init_map+0x100/0x5a0 [ 34.215364] ? __lockdep_init_map+0x100/0x5a0 [ 34.219843] nbd_dev_add+0x6a9/0x890 [ 34.223550] nbd_genl_connect+0x488/0x1630 [ 34.227767] ? nbd_xmit_timeout+0x730/0x730 [ 34.232074] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 34.237332] ? validate_nla+0x270/0x820 [ 34.241291] ? nla_parse+0x1b2/0x290 [ 34.244992] genl_family_rcv_msg+0x642/0xc40 [ 34.249391] ? genl_rcv+0x40/0x40 [ 34.252827] ? genl_rcv_msg+0x12f/0x160 [ 34.256781] ? mutex_trylock+0x1a0/0x1a0 [ 34.260828] ? __radix_tree_lookup+0x216/0x370 [ 34.265394] genl_rcv_msg+0xbf/0x160 [ 34.269088] netlink_rcv_skb+0x160/0x440 [ 34.273128] ? genl_family_rcv_msg+0xc40/0xc40 [ 34.277691] ? netlink_ack+0xae0/0xae0 [ 34.281559] ? genl_rcv+0x15/0x40 [ 34.285000] genl_rcv+0x24/0x40 [ 34.288261] netlink_unicast+0x4d5/0x690 [ 34.292311] ? netlink_sendskb+0x110/0x110 [ 34.296541] ? _copy_from_iter_full+0x229/0x7c0 [ 34.301190] ? __phys_addr_symbol+0x2c/0x70 [ 34.305495] ? __check_object_size+0x17b/0x3e0 [ 34.310060] netlink_sendmsg+0x6c3/0xc50 [ 34.314104] ? aa_af_perm+0x230/0x230 [ 34.317884] ? nlmsg_notify+0x1f0/0x1f0 [ 34.321843] ? kernel_recvmsg+0x220/0x220 [ 34.325975] ? nlmsg_notify+0x1f0/0x1f0 [ 34.329933] sock_sendmsg+0xc3/0x120 [ 34.333629] ___sys_sendmsg+0x7bb/0x8e0 [ 34.337584] ? copy_msghdr_from_user+0x440/0x440 [ 34.342319] ? netlink_dump+0xc10/0xc10 [ 34.346276] ? nlmsg_notify+0x1f0/0x1f0 [ 34.350236] ? security_socket_recvmsg+0x8f/0xc0 [ 34.354973] ? __sys_recvfrom+0x2cd/0x3a0 [ 34.359103] ? __ia32_sys_send+0x100/0x100 [ 34.363325] ? __fdget+0x1a0/0x230 [ 34.366846] __x64_sys_sendmsg+0x132/0x220 [ 34.371063] ? __sys_sendmsg+0x1b0/0x1b0 [ 34.375116] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.380460] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.385457] ? do_syscall_64+0x21/0x620 [ 34.389413] do_syscall_64+0xf9/0x620 [ 34.393197] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.398368] RIP: 0033:0x7fdfad73cb79 [ 34.402065] 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 [ 34.421020] RSP: 002b:00007ffe6c4118b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.428711] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdfad73cb79 [ 34.435961] RDX: 0000000004000010 RSI: 00000000200001c0 RDI: 0000000000000004 [ 34.443210] RBP: 00007fdfad7005e0 R08: 0000000000000000 R09: 0000000000000000 [ 34.450455] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdfad700670 [ 34.457708] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 34.465304] Kernel Offset: disabled [ 34.468964] Rebooting in 86400 seconds..