[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.447149] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.895457] random: sshd: uninitialized urandom read (32 bytes read) [ 23.228543] random: sshd: uninitialized urandom read (32 bytes read) [ 23.920677] random: sshd: uninitialized urandom read (32 bytes read) [ 39.474455] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 44.942322] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 45.049267] sysfs: cannot create duplicate filename '/devices/virtual/bdi/7:199-fuseblk' [ 45.057637] CPU: 1 PID: 4541 Comm: syz-executor401 Not tainted 4.17.0-rc2+ #19 [ 45.064976] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.074306] Call Trace: [ 45.076878] dump_stack+0x1b9/0x294 [ 45.080489] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.085658] ? trace_hardirqs_on+0xd/0x10 [ 45.089800] sysfs_warn_dup.cold.3+0x1c/0x2b [ 45.094197] sysfs_create_dir_ns+0x184/0x1d0 [ 45.098587] kobject_add_internal+0x353/0xba0 [ 45.103062] ? kobj_ns_type_registered+0x60/0x60 [ 45.107798] ? lock_downgrade+0x8e0/0x8e0 [ 45.111929] ? refcount_add_not_zero+0x320/0x320 [ 45.116667] ? kasan_check_read+0x11/0x20 [ 45.120798] kobject_add+0x13a/0x190 [ 45.124490] ? kset_create_and_add+0x190/0x190 [ 45.129059] ? mutex_unlock+0xd/0x10 [ 45.132752] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 45.137662] device_add+0x3a5/0x16d0 [ 45.141359] ? device_private_init+0x230/0x230 [ 45.145919] ? kfree+0x1e9/0x260 [ 45.149272] ? kfree_const+0x5e/0x70 [ 45.152967] device_create_groups_vargs+0x1ff/0x270 [ 45.157977] device_create_vargs+0x46/0x60 [ 45.162199] bdi_register_va.part.10+0xbb/0x970 [ 45.166849] ? cgwb_kill+0x630/0x630 [ 45.170548] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.176073] ? bdi_init+0x416/0x510 [ 45.179680] ? wb_init+0x9e0/0x9e0 [ 45.183204] ? bdi_alloc_node+0x67/0xe0 [ 45.187173] ? bdi_alloc_node+0x67/0xe0 [ 45.191136] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.196135] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 45.201397] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.206914] ? refcount_sub_and_test+0x212/0x330 [ 45.211657] bdi_register_va+0x68/0x80 [ 45.215546] super_setup_bdi_name+0x123/0x220 [ 45.220022] ? kill_block_super+0x100/0x100 [ 45.224328] ? kmem_cache_alloc_trace+0x616/0x780 [ 45.229153] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.234155] fuse_fill_super+0xe6e/0x1e20 [ 45.238288] ? fuse_get_root_inode+0x190/0x190 [ 45.242851] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.248369] ? vsnprintf+0x242/0x1b40 [ 45.252157] ? pointer+0xa20/0xa20 [ 45.255689] ? vsprintf+0x40/0x40 [ 45.259123] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.264129] ? set_blocksize+0x2c4/0x350 [ 45.268175] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.273697] mount_bdev+0x30c/0x3e0 [ 45.277304] ? fuse_get_root_inode+0x190/0x190 [ 45.281868] fuse_mount_blk+0x34/0x40 [ 45.285650] mount_fs+0xae/0x328 [ 45.289016] vfs_kern_mount.part.34+0xd4/0x4d0 [ 45.293581] ? may_umount+0xb0/0xb0 [ 45.297191] ? _raw_read_unlock+0x22/0x30 [ 45.301318] ? __get_fs_type+0x97/0xc0 [ 45.305191] do_mount+0x564/0x3070 [ 45.308715] ? copy_mount_string+0x40/0x40 [ 45.312936] ? rcu_pm_notify+0xc0/0xc0 [ 45.316809] ? copy_mount_options+0x5f/0x380 [ 45.321202] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.326212] ? kmem_cache_alloc_trace+0x616/0x780 [ 45.331061] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.336614] ? _copy_from_user+0xdf/0x150 [ 45.340756] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.346367] ? copy_mount_options+0x285/0x380 [ 45.350846] ksys_mount+0x12d/0x140 [ 45.354454] __x64_sys_mount+0xbe/0x150 [ 45.358410] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 45.363415] do_syscall_64+0x1b1/0x800 [ 45.367286] ? syscall_return_slowpath+0x5c0/0x5c0 [ 45.372219] ? syscall_return_slowpath+0x30f/0x5c0 [ 45.377159] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.382689] ? retint_user+0x18/0x18 [ 45.386404] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.391513] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.396684] RIP: 0033:0x4407f9 [ 45.399864] RSP: 002b:00007ffe121eda38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 45.407560] RAX: ffffffffffffffda RBX: 6f72746e6f632f2e RCX: 00000000004407f9 [ 45.414908] RDX: 00000000004a287b RSI: 0000000020000140 RDI: 0000000020000180 [ 45.422162] RBP: 0000000000000003 R08: 00007ffe121eda50 R09: 0000000000000000 [ 45.429413] R10: 0000000000000000 R11: 0000000000000202 R12: 0031656c69662f6c [ 45.436660] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 45.444093] ------------[ cut here ]------------ [ 45.448868] kobject_add_internal failed for 7:199-fuseblk with -EEXIST, don't try to register things with the same name in the same directory. [ 45.462094] WARNING: CPU: 1 PID: 4541 at lib/kobject.c:238 kobject_add_internal+0x8e0/0xba0 [ 45.470567] Kernel panic - not syncing: panic_on_warn set ... [ 45.470567] [ 45.477917] CPU: 1 PID: 4541 Comm: syz-executor401 Not tainted 4.17.0-rc2+ #19 [ 45.485256] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.494588] Call Trace: [ 45.497158] dump_stack+0x1b9/0x294 [ 45.500768] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.505949] ? kobject_add_internal+0x8c0/0xba0 [ 45.510600] panic+0x22f/0x4de [ 45.513776] ? add_taint.cold.5+0x16/0x16 [ 45.517912] ? __warn.cold.8+0x148/0x1b3 [ 45.521951] ? __warn.cold.8+0x117/0x1b3 [ 45.526010] ? kobject_add_internal+0x8e0/0xba0 [ 45.530658] __warn.cold.8+0x163/0x1b3 [ 45.534526] ? kobject_add_internal+0x8e0/0xba0 [ 45.539176] report_bug+0x252/0x2d0 [ 45.542790] do_error_trap+0x1de/0x490 [ 45.546655] ? math_error+0x420/0x420 [ 45.550435] ? vprintk_default+0x28/0x30 [ 45.554478] ? vprintk_func+0x81/0xe7 [ 45.558258] ? printk+0x9e/0xba [ 45.561525] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.566440] do_invalid_op+0x1b/0x20 [ 45.570143] invalid_op+0x14/0x20 [ 45.573579] RIP: 0010:kobject_add_internal+0x8e0/0xba0 [ 45.578831] RSP: 0000:ffff8801ad7d7270 EFLAGS: 00010286 [ 45.584185] RAX: 0000000000000082 RBX: ffff8801ad12e490 RCX: ffffffff8160a82d [ 45.591434] RDX: 0000000000000000 RSI: ffffffff8160f4e1 RDI: ffff8801ad7d6dd0 [ 45.598686] RBP: ffff8801ad7d7368 R08: ffff8801ad6f4680 R09: 0000000000000006 [ 45.606023] R10: ffff8801ad6f4680 R11: 0000000000000000 R12: 00000000ffffffef [ 45.613272] R13: ffff8801d2deab80 R14: 1ffff10035afae58 R15: ffff8801d9bcaf00 [ 45.620564] ? console_unlock+0x8ad/0x1100 [ 45.624785] ? vprintk_func+0x81/0xe7 [ 45.628570] ? kobj_ns_type_registered+0x60/0x60 [ 45.633307] ? lock_downgrade+0x8e0/0x8e0 [ 45.637438] ? refcount_add_not_zero+0x320/0x320 [ 45.642208] ? kasan_check_read+0x11/0x20 [ 45.646380] kobject_add+0x13a/0x190 [ 45.650114] ? kset_create_and_add+0x190/0x190 [ 45.654702] ? mutex_unlock+0xd/0x10 [ 45.658413] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 45.663342] device_add+0x3a5/0x16d0 [ 45.667043] ? device_private_init+0x230/0x230 [ 45.671603] ? kfree+0x1e9/0x260 [ 45.674948] ? kfree_const+0x5e/0x70 [ 45.678642] device_create_groups_vargs+0x1ff/0x270 [ 45.683640] device_create_vargs+0x46/0x60 [ 45.687857] bdi_register_va.part.10+0xbb/0x970 [ 45.692508] ? cgwb_kill+0x630/0x630 [ 45.696204] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.701722] ? bdi_init+0x416/0x510 [ 45.705331] ? wb_init+0x9e0/0x9e0 [ 45.708849] ? bdi_alloc_node+0x67/0xe0 [ 45.712805] ? bdi_alloc_node+0x67/0xe0 [ 45.717109] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.722543] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 45.727804] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.733330] ? refcount_sub_and_test+0x212/0x330 [ 45.738065] bdi_register_va+0x68/0x80 [ 45.741937] super_setup_bdi_name+0x123/0x220 [ 45.746413] ? kill_block_super+0x100/0x100 [ 45.750717] ? kmem_cache_alloc_trace+0x616/0x780 [ 45.755542] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.760545] fuse_fill_super+0xe6e/0x1e20 [ 45.764677] ? fuse_get_root_inode+0x190/0x190 [ 45.769243] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.774762] ? vsnprintf+0x242/0x1b40 [ 45.778543] ? pointer+0xa20/0xa20 [ 45.782073] ? vsprintf+0x40/0x40 [ 45.785507] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.790505] ? set_blocksize+0x2c4/0x350 [ 45.794554] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.800074] mount_bdev+0x30c/0x3e0 [ 45.803683] ? fuse_get_root_inode+0x190/0x190 [ 45.808248] fuse_mount_blk+0x34/0x40 [ 45.812030] mount_fs+0xae/0x328 [ 45.815379] vfs_kern_mount.part.34+0xd4/0x4d0 [ 45.819944] ? may_umount+0xb0/0xb0 [ 45.823552] ? _raw_read_unlock+0x22/0x30 [ 45.827678] ? __get_fs_type+0x97/0xc0 [ 45.831551] do_mount+0x564/0x3070 [ 45.835081] ? copy_mount_string+0x40/0x40 [ 45.839297] ? rcu_pm_notify+0xc0/0xc0 [ 45.843168] ? copy_mount_options+0x5f/0x380 [ 45.847642] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.852641] ? kmem_cache_alloc_trace+0x616/0x780 [ 45.857469] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.862990] ? _copy_from_user+0xdf/0x150 [ 45.867126] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.872642] ? copy_mount_options+0x285/0x380 [ 45.877120] ksys_mount+0x12d/0x140 [ 45.880730] __x64_sys_mount+0xbe/0x150 [ 45.884685] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 45.889686] do_syscall_64+0x1b1/0x800 [ 45.893557] ? syscall_return_slowpath+0x5c0/0x5c0 [ 45.898468] ? syscall_return_slowpath+0x30f/0x5c0 [ 45.903382] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.908914] ? retint_user+0x18/0x18 [ 45.912695] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.917520] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.922685] RIP: 0033:0x4407f9 [ 45.925852] RSP: 002b:00007ffe121eda38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 45.933549] RAX: ffffffffffffffda RBX: 6f72746e6f632f2e RCX: 00000000004407f9 [ 45.940800] RDX: 00000000004a287b RSI: 0000000020000140 RDI: 0000000020000180 [ 45.948057] RBP: 0000000000000003 R08: 00007ffe121eda50 R09: 0000000000000000 [ 45.955314] R10: 0000000000000000 R11: 0000000000000202 R12: 0031656c69662f6c [ 45.962565] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 45.970331] Dumping ftrace buffer: [ 45.973948] (ftrace buffer empty) [ 45.977640] Kernel Offset: disabled [ 45.981251] Rebooting in 86400 seconds..