[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.691361] sysfs: cannot create duplicate filename '/devices/virtual/bdi/7:0' [ 38.699056] CPU: 1 PID: 8117 Comm: syz-executor477 Not tainted 4.19.163-syzkaller #0 [ 38.706922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.716265] Call Trace: [ 38.718854] dump_stack+0x1fc/0x2fe [ 38.722467] sysfs_warn_dup.cold+0x1c/0x2d [ 38.726685] sysfs_create_dir_ns+0x228/0x280 [ 38.731437] ? sysfs_create_mount_point+0xb0/0xb0 [ 38.736274] ? lock_acquire+0x170/0x3c0 [ 38.740261] ? kobject_add_internal+0x134/0x9c0 [ 38.745050] ? bdi_register_va.part.0+0x35/0x730 [ 38.749819] ? class_dir_child_ns_type+0x9/0x60 [ 38.754479] kobject_add_internal+0x2a5/0x9c0 [ 38.759008] kobject_add+0x150/0x1c0 [ 38.762729] ? kset_create_and_add+0x1a0/0x1a0 [ 38.767308] ? device_add+0x2c7/0x16d0 [ 38.771191] device_add+0x37b/0x16d0 [ 38.774905] ? device_check_offline+0x280/0x280 [ 38.779571] ? kfree_const+0x51/0x60 [ 38.783381] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 38.788381] ? kfree+0x1e2/0x210 [ 38.791767] device_create_groups_vargs+0x1f4/0x270 [ 38.796771] device_create_vargs+0x3a/0x50 [ 38.800992] bdi_register_va.part.0+0x35/0x730 [ 38.805605] bdi_register+0x12a/0x140 [ 38.809397] ? bdi_register_va+0x80/0x80 [ 38.813445] ? vsnprintf+0x2cc/0x14f0 [ 38.817235] bdi_register_owner+0x59/0x100 [ 38.821542] __device_add_disk+0xcd6/0x1070 [ 38.825883] ? sprintf+0xc0/0x100 [ 38.829350] ? blk_alloc_devt+0x2d0/0x2d0 [ 38.833500] ? __init_waitqueue_head+0x31/0x90 [ 38.838076] ? __lockdep_init_map+0x100/0x5a0 [ 38.842559] loop_add+0x626/0x8a0 [ 38.846022] loop_control_ioctl+0x16c/0x480 [ 38.850327] ? loop_lookup+0x1d0/0x1d0 [ 38.854215] ? lock_downgrade+0x720/0x720 [ 38.858362] ? lock_acquire+0x170/0x3c0 [ 38.862335] ? debug_check_no_obj_freed+0xb5/0x482 [ 38.867261] ? loop_lookup+0x1d0/0x1d0 [ 38.871135] do_vfs_ioctl+0xcdb/0x12e0 [ 38.875036] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 38.880137] ? debug_check_no_obj_freed+0x201/0x482 [ 38.885759] ? ioctl_preallocate+0x200/0x200 [ 38.890239] ? putname+0xe1/0x120 [ 38.893674] ? putname+0xe1/0x120 [ 38.897109] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 38.902108] ? kmem_cache_free+0x226/0x260 [ 38.906331] ? putname+0xe1/0x120 [ 38.909767] ? do_sys_open+0x2bf/0x520 [ 38.913652] ? filp_open+0x70/0x70 [ 38.917189] ksys_ioctl+0x9b/0xc0 [ 38.920656] __x64_sys_ioctl+0x6f/0xb0 [ 38.924522] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 38.929092] do_syscall_64+0xf9/0x620 [ 38.932877] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.938064] RIP: 0033:0x440239 [ 38.941251] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.960140] RSP: 002b:00007ffc6e853cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 38.967845] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 38.975102] RDX: 0000000000200000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 38.982367] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.989645] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 38.996898] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 39.006246] kobject_add_internal failed for 7:0 with -EEXIST, don't try to register things with the same name in the same directory. [ 39.018660] ------------[ cut here ]------------ [ 39.023776] WARNING: CPU: 0 PID: 8117 at block/genhd.c:709 __device_add_disk.cold+0x105/0x170 [ 39.032445] Kernel panic - not syncing: panic_on_warn set ... [ 39.032445] [ 39.040040] CPU: 0 PID: 8117 Comm: syz-executor477 Not tainted 4.19.163-syzkaller #0 [ 39.048118] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.057466] Call Trace: [ 39.060046] dump_stack+0x1fc/0x2fe [ 39.063691] panic+0x26a/0x50e [ 39.066868] ? __warn_printk+0xf3/0xf3 [ 39.070742] ? __device_add_disk.cold+0x105/0x170 [ 39.075571] ? __probe_kernel_read+0x130/0x1b0 [ 39.080148] ? __warn.cold+0x5/0x61 [ 39.083767] ? __warn+0xe4/0x200 [ 39.087134] ? __device_add_disk.cold+0x105/0x170 [ 39.091957] __warn.cold+0x20/0x61 [ 39.095487] ? __device_add_disk.cold+0x105/0x170 [ 39.100317] report_bug+0x262/0x2b0 [ 39.103941] do_error_trap+0x1d7/0x310 [ 39.107823] ? math_error+0x310/0x310 [ 39.114125] ? irq_work_claim+0xa6/0xc0 [ 39.118079] ? irq_work_queue+0x29/0x80 [ 39.122030] ? error_entry+0x72/0xd0 [ 39.125723] ? trace_hardirqs_off_caller+0x6e/0x210 [ 39.130720] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.135893] invalid_op+0x14/0x20 [ 39.139337] RIP: 0010:__device_add_disk.cold+0x105/0x170 [ 39.144764] Code: 03 0f b6 04 02 84 c0 74 04 3c 03 7e 24 44 8b a5 b8 05 00 00 e9 ee d3 ff ff e8 d1 e9 f4 fd 48 c7 c7 40 4f b2 88 e8 54 e3 df fd <0f> 0b e9 99 df ff ff 48 8b 3c 24 e8 e5 11 2b fe eb d1 e8 ae e9 f4 [ 39.163662] RSP: 0018:ffff8880b0c9fb40 EFLAGS: 00010282 [ 39.169016] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 39.177406] RDX: 0000000000000000 RSI: ffffffff814fdbb1 RDI: ffffed1016193f5a [ 39.184654] RBP: ffff8880b1630080 R08: 0000000000000024 R09: 0000000000000000 [ 39.191903] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b1630110 [ 39.199152] R13: ffff8880b16306d8 R14: 00000000ffffffef R15: ffff8880b1630084 [ 39.206409] ? vprintk_func+0x81/0x17e [ 39.210277] ? sprintf+0xc0/0x100 [ 39.213713] ? blk_alloc_devt+0x2d0/0x2d0 [ 39.217929] ? __init_waitqueue_head+0x31/0x90 [ 39.222592] ? __lockdep_init_map+0x100/0x5a0 [ 39.227069] loop_add+0x626/0x8a0 [ 39.230531] loop_control_ioctl+0x16c/0x480 [ 39.234859] ? loop_lookup+0x1d0/0x1d0 [ 39.238739] ? lock_downgrade+0x720/0x720 [ 39.242866] ? lock_acquire+0x170/0x3c0 [ 39.246824] ? debug_check_no_obj_freed+0xb5/0x482 [ 39.251739] ? loop_lookup+0x1d0/0x1d0 [ 39.255697] do_vfs_ioctl+0xcdb/0x12e0 [ 39.259564] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 39.264645] ? debug_check_no_obj_freed+0x201/0x482 [ 39.269653] ? ioctl_preallocate+0x200/0x200 [ 39.274045] ? putname+0xe1/0x120 [ 39.277521] ? putname+0xe1/0x120 [ 39.280969] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 39.285981] ? kmem_cache_free+0x226/0x260 [ 39.290252] ? putname+0xe1/0x120 [ 39.293688] ? do_sys_open+0x2bf/0x520 [ 39.297558] ? filp_open+0x70/0x70 [ 39.301085] ksys_ioctl+0x9b/0xc0 [ 39.304523] __x64_sys_ioctl+0x6f/0xb0 [ 39.308394] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 39.312973] do_syscall_64+0xf9/0x620 [ 39.316768] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.321940] RIP: 0033:0x440239 [ 39.325114] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 39.344094] RSP: 002b:00007ffc6e853cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 39.351798] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 39.359053] RDX: 0000000000200000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 39.366304] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.373574] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 39.380832] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 39.389023] Kernel Offset: disabled [ 39.392698] Rebooting in 86400 seconds..