[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.733766] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.415206] random: sshd: uninitialized urandom read (32 bytes read) [ 22.709741] random: sshd: uninitialized urandom read (32 bytes read) [ 23.433060] random: sshd: uninitialized urandom read (32 bytes read) [ 23.591778] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 29.090217] 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 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 [ 29.201056] sysfs: cannot create duplicate filename '/devices/virtual/bdi/7:199-fuseblk' [ 29.209497] CPU: 0 PID: 4513 Comm: syz-executor282 Not tainted 4.17.0-rc2+ #19 [ 29.216872] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.226232] Call Trace: [ 29.228837] dump_stack+0x1b9/0x294 [ 29.232478] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.238213] sysfs_warn_dup.cold.3+0x1c/0x2b [ 29.242632] sysfs_create_dir_ns+0x184/0x1d0 [ 29.247052] kobject_add_internal+0x353/0xba0 [ 29.251572] ? kobj_ns_type_registered+0x60/0x60 [ 29.256343] ? lock_downgrade+0x8e0/0x8e0 [ 29.260502] ? refcount_add_not_zero+0x320/0x320 [ 29.265274] ? kasan_check_read+0x11/0x20 [ 29.269438] kobject_add+0x13a/0x190 [ 29.273162] ? kset_create_and_add+0x190/0x190 [ 29.277800] ? mutex_unlock+0xd/0x10 [ 29.281530] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 29.286497] device_add+0x3a5/0x16d0 [ 29.290229] ? device_private_init+0x230/0x230 [ 29.294821] ? kfree+0x1e9/0x260 [ 29.298203] ? kfree_const+0x5e/0x70 [ 29.301935] device_create_groups_vargs+0x1ff/0x270 [ 29.306969] device_create_vargs+0x46/0x60 [ 29.311221] bdi_register_va.part.10+0xbb/0x970 [ 29.315901] ? cgwb_kill+0x630/0x630 [ 29.319628] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.325177] ? bdi_init+0x416/0x510 [ 29.328837] ? wb_init+0x9e0/0x9e0 [ 29.332386] ? bdi_alloc_node+0x67/0xe0 [ 29.336375] ? bdi_alloc_node+0x67/0xe0 [ 29.340358] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.345390] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 29.350680] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.356327] bdi_register_va+0x68/0x80 [ 29.360231] super_setup_bdi_name+0x123/0x220 [ 29.364738] ? kill_block_super+0x100/0x100 [ 29.369070] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.373925] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.378993] fuse_fill_super+0xe6e/0x1e20 [ 29.383246] ? fuse_get_root_inode+0x190/0x190 [ 29.387850] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.393420] ? vsnprintf+0x242/0x1b40 [ 29.397238] ? pointer+0xa20/0xa20 [ 29.400797] ? vsprintf+0x40/0x40 [ 29.404262] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.409299] ? set_blocksize+0x2c4/0x350 [ 29.413372] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.418946] mount_bdev+0x30c/0x3e0 [ 29.422609] ? fuse_get_root_inode+0x190/0x190 [ 29.427210] fuse_mount_blk+0x34/0x40 [ 29.431026] mount_fs+0xae/0x328 [ 29.434405] vfs_kern_mount.part.34+0xd4/0x4d0 [ 29.439002] ? may_umount+0xb0/0xb0 [ 29.442642] ? _raw_read_unlock+0x22/0x30 [ 29.446798] ? __get_fs_type+0x97/0xc0 [ 29.450703] do_mount+0x564/0x3070 [ 29.454255] ? copy_mount_string+0x40/0x40 [ 29.458500] ? rcu_pm_notify+0xc0/0xc0 [ 29.462405] ? copy_mount_options+0x5f/0x380 [ 29.466820] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.471841] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.476706] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.482255] ? copy_mount_options+0x285/0x380 [ 29.486764] ksys_mount+0x12d/0x140 [ 29.490400] __x64_sys_mount+0xbe/0x150 [ 29.494380] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.499408] do_syscall_64+0x1b1/0x800 [ 29.503318] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.508258] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.513208] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.519630] ? retint_user+0x18/0x18 [ 29.523360] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.528225] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.533432] RIP: 0033:0x440789 [ 29.536625] RSP: 002b:00007ffd131df9c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 29.544346] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440789 [ 29.551624] RDX: 00000000004a278e RSI: 0000000020000080 RDI: 00000000200000c0 [ 29.558908] RBP: 0030656c69662f2e R08: 00007ffd131df9e0 R09: 0000000000000000 [ 29.566967] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401b20 [ 29.574239] R13: 0000000000401bb0 R14: 0000000000000000 R15: 0000000000000000 [ 29.581620] ------------[ cut here ]------------ [ 29.586406] kobject_add_internal failed for 7:199-fuseblk with -EEXIST, don't try to register things with the same name in the same directory. [ 29.599687] WARNING: CPU: 0 PID: 4513 at lib/kobject.c:238 kobject_add_internal+0x8e0/0xba0 [ 29.608190] Kernel panic - not syncing: panic_on_warn set ... [ 29.608190] [ 29.615568] CPU: 0 PID: 4513 Comm: syz-executor282 Not tainted 4.17.0-rc2+ #19 [ 29.622925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.632287] Call Trace: [ 29.634887] dump_stack+0x1b9/0x294 [ 29.638528] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.643729] ? kobject_add_internal+0x8c0/0xba0 [ 29.648409] panic+0x22f/0x4de [ 29.651606] ? add_taint.cold.5+0x16/0x16 [ 29.655772] ? __warn.cold.8+0x148/0x1b3 [ 29.659839] ? __warn.cold.8+0x117/0x1b3 [ 29.663907] ? kobject_add_internal+0x8e0/0xba0 [ 29.668591] __warn.cold.8+0x163/0x1b3 [ 29.672492] ? kobject_add_internal+0x8e0/0xba0 [ 29.677171] report_bug+0x252/0x2d0 [ 29.680809] do_error_trap+0x1de/0x490 [ 29.684718] ? math_error+0x420/0x420 [ 29.688525] ? vprintk_default+0x28/0x30 [ 29.692590] ? vprintk_func+0x81/0xe7 [ 29.696398] ? printk+0x9e/0xba [ 29.699695] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.704560] do_invalid_op+0x1b/0x20 [ 29.708299] invalid_op+0x14/0x20 [ 29.711782] RIP: 0010:kobject_add_internal+0x8e0/0xba0 [ 29.717054] RSP: 0018:ffff8801adb1f270 EFLAGS: 00010286 [ 29.722426] RAX: 0000000000000082 RBX: ffff8801adbf0950 RCX: ffffffff8160a82d [ 29.729701] RDX: 0000000000000000 RSI: ffffffff8160f4e1 RDI: ffff8801adb1edd0 [ 29.736978] RBP: ffff8801adb1f368 R08: ffff8801ada72640 R09: 0000000000000006 [ 29.744260] R10: ffff8801ada72640 R11: 0000000000000000 R12: 00000000ffffffef [ 29.751550] R13: ffff8801d2d6a700 R14: 1ffff10035b63e58 R15: ffff8801d9a20100 [ 29.758858] ? console_unlock+0x8ad/0x1100 [ 29.763111] ? vprintk_func+0x81/0xe7 [ 29.766930] ? kobj_ns_type_registered+0x60/0x60 [ 29.771696] ? lock_downgrade+0x8e0/0x8e0 [ 29.775857] ? refcount_add_not_zero+0x320/0x320 [ 29.780712] ? kasan_check_read+0x11/0x20 [ 29.784870] kobject_add+0x13a/0x190 [ 29.788589] ? kset_create_and_add+0x190/0x190 [ 29.793180] ? mutex_unlock+0xd/0x10 [ 29.796901] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 29.801846] device_add+0x3a5/0x16d0 [ 29.805744] ? device_private_init+0x230/0x230 [ 29.810415] ? kfree+0x1e9/0x260 [ 29.814749] ? kfree_const+0x5e/0x70 [ 29.818481] device_create_groups_vargs+0x1ff/0x270 [ 29.823541] device_create_vargs+0x46/0x60 [ 29.827793] bdi_register_va.part.10+0xbb/0x970 [ 29.832478] ? cgwb_kill+0x630/0x630 [ 29.836210] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.841763] ? bdi_init+0x416/0x510 [ 29.845393] ? wb_init+0x9e0/0x9e0 [ 29.849290] ? bdi_alloc_node+0x67/0xe0 [ 29.853270] ? bdi_alloc_node+0x67/0xe0 [ 29.857255] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.862290] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 29.867590] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.873149] bdi_register_va+0x68/0x80 [ 29.877050] super_setup_bdi_name+0x123/0x220 [ 29.881556] ? kill_block_super+0x100/0x100 [ 29.885892] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.890743] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.895780] fuse_fill_super+0xe6e/0x1e20 [ 29.899940] ? fuse_get_root_inode+0x190/0x190 [ 29.904535] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.910078] ? vsnprintf+0x242/0x1b40 [ 29.913888] ? pointer+0xa20/0xa20 [ 29.917439] ? vsprintf+0x40/0x40 [ 29.920904] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.925933] ? set_blocksize+0x2c4/0x350 [ 29.930011] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.935570] mount_bdev+0x30c/0x3e0 [ 29.939212] ? fuse_get_root_inode+0x190/0x190 [ 29.943815] fuse_mount_blk+0x34/0x40 [ 29.947627] mount_fs+0xae/0x328 [ 29.951009] vfs_kern_mount.part.34+0xd4/0x4d0 [ 29.955612] ? may_umount+0xb0/0xb0 [ 29.959254] ? _raw_read_unlock+0x22/0x30 [ 29.963406] ? __get_fs_type+0x97/0xc0 [ 29.967312] do_mount+0x564/0x3070 [ 29.970862] ? copy_mount_string+0x40/0x40 [ 29.975101] ? rcu_pm_notify+0xc0/0xc0 [ 29.979001] ? copy_mount_options+0x5f/0x380 [ 29.983418] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.988443] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.993306] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.998851] ? copy_mount_options+0x285/0x380 [ 30.003361] ksys_mount+0x12d/0x140 [ 30.007001] __x64_sys_mount+0xbe/0x150 [ 30.010985] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.016188] do_syscall_64+0x1b1/0x800 [ 30.020092] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.025025] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.029968] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.035513] ? retint_user+0x18/0x18 [ 30.039248] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.044106] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.049297] RIP: 0033:0x440789 [ 30.052493] RSP: 002b:00007ffd131df9c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 30.060209] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440789 [ 30.067493] RDX: 00000000004a278e RSI: 0000000020000080 RDI: 00000000200000c0 [ 30.074772] RBP: 0030656c69662f2e R08: 00007ffd131df9e0 R09: 0000000000000000 [ 30.082053] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401b20 [ 30.089332] R13: 0000000000401bb0 R14: 0000000000000000 R15: 0000000000000000 [ 30.097361] Dumping ftrace buffer: [ 30.101064] (ftrace buffer empty) [ 30.104759] Kernel Offset: disabled [ 30.108370] Rebooting in 86400 seconds..