INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. 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 syzkaller login: [ 28.614605] sysfs: cannot create duplicate filename '/devices/virtual/bdi/7:199-fuseblk' [ 28.622994] CPU: 1 PID: 4192 Comm: syzkaller834824 Not tainted 4.16.0-rc6+ #1 [ 28.630253] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.639587] Call Trace: [ 28.642166] dump_stack+0x194/0x24d [ 28.645785] ? arch_local_irq_restore+0x53/0x53 [ 28.650436] ? trace_hardirqs_on+0xd/0x10 [ 28.654565] ? sysfs_warn_dup+0x6c/0xa0 [ 28.658520] sysfs_warn_dup+0x83/0xa0 [ 28.662297] sysfs_create_dir_ns+0x178/0x1d0 [ 28.667213] kobject_add_internal+0x335/0xbc0 [ 28.671683] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 28.676511] ? kobj_ns_type_registered+0x50/0x50 [ 28.681246] ? get_device_parent.isra.25+0x423/0x590 [ 28.686333] ? lock_downgrade+0x980/0x980 [ 28.690462] ? lock_release+0xa40/0xa40 [ 28.694418] kobject_add+0x132/0x1f0 [ 28.698109] ? kobject_add_internal+0xbc0/0xbc0 [ 28.702760] ? mutex_unlock+0xd/0x10 [ 28.706449] ? device_add+0x350/0x1650 [ 28.710317] device_add+0x35d/0x1650 [ 28.714017] ? device_private_init+0x230/0x230 [ 28.718576] ? kfree+0x1f6/0x260 [ 28.722012] ? kfree_const+0x36/0x40 [ 28.725708] device_create_groups_vargs+0x1f3/0x250 [ 28.730884] device_create_vargs+0x46/0x60 [ 28.735115] bdi_register_va.part.10+0xbb/0x8c0 [ 28.739773] ? wb_shutdown+0x430/0x430 [ 28.743641] ? bdi_init+0x3e3/0x4e0 [ 28.747504] ? wb_init+0xa20/0xa20 [ 28.751024] ? bdi_alloc_node+0x5c/0xc0 [ 28.754972] ? bdi_alloc_node+0x5c/0xc0 [ 28.758924] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.763919] ? kmem_cache_alloc_node_trace+0x36f/0x760 [ 28.769205] bdi_register_va+0x68/0x80 [ 28.773072] super_setup_bdi_name+0x136/0x230 [ 28.777546] ? kill_block_super+0xf0/0xf0 [ 28.781674] ? kmem_cache_alloc_trace+0x459/0x740 [ 28.786493] ? match_wildcard+0x390/0x390 [ 28.790629] fuse_fill_super+0xe75/0x1d60 [ 28.794762] ? fuse_get_root_inode+0x190/0x190 [ 28.799325] ? vsnprintf+0x1ed/0x1900 [ 28.803122] ? pointer+0x9c0/0x9c0 [ 28.806636] ? wait_for_completion+0x770/0x770 [ 28.811198] ? cap_capable+0x1b5/0x230 [ 28.815067] ? vsprintf+0x40/0x40 [ 28.818501] ? ns_capable_common+0xcf/0x160 [ 28.822801] ? set_blocksize+0x1f1/0x260 [ 28.826854] mount_bdev+0x2b7/0x370 [ 28.830457] ? mount_bdev+0x2b7/0x370 [ 28.834232] ? fuse_get_root_inode+0x190/0x190 [ 28.839355] fuse_mount_blk+0x34/0x40 [ 28.843140] mount_fs+0x66/0x2d0 [ 28.846489] vfs_kern_mount.part.26+0xc6/0x4a0 [ 28.851061] ? may_umount+0xa0/0xa0 [ 28.854671] ? _raw_read_unlock+0x22/0x30 [ 28.858807] ? __get_fs_type+0x8a/0xc0 [ 28.862678] do_mount+0xea4/0x2bb0 [ 28.866200] ? copy_mount_string+0x40/0x40 [ 28.870415] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.875588] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.880330] ? retint_kernel+0x10/0x10 [ 28.884203] ? copy_mount_options+0x18b/0x2e0 [ 28.888677] ? memset+0x31/0x40 [ 28.891935] ? copy_mount_options+0x1f7/0x2e0 [ 28.896415] SyS_mount+0xab/0x120 [ 28.899846] ? copy_mnt_ns+0xb30/0xb30 [ 28.903715] do_syscall_64+0x281/0x940 [ 28.907575] ? __do_page_fault+0xc90/0xc90 [ 28.911787] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.916519] ? syscall_return_slowpath+0x550/0x550 [ 28.921427] ? syscall_return_slowpath+0x2ac/0x550 [ 28.926342] ? prepare_exit_to_usermode+0x350/0x350 [ 28.931338] ? retint_user+0x18/0x18 [ 28.935031] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.939860] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 28.945040] RIP: 0033:0x4407c9 [ 28.948209] RSP: 002b:00007ffee445b638 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 28.955899] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004407c9 [ 28.963152] RDX: 00000000004a27dc RSI: 0000000020000180 RDI: 0000000020000240 [ 28.970401] RBP: 0030656c69662f2e R08: 00007ffee445b650 R09: 0000000000000000 [ 28.977648] R10: 0000000000800080 R11: 0000000000000202 R12: 00007ffee445b650 [ 28.984894] R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 [ 28.992447] ------------[ cut here ]------------ [ 28.997222] kobject_add_internal failed for 7:199-fuseblk with -EEXIST, don't try to register things with the same name in the same directory. [ 29.010299] WARNING: CPU: 1 PID: 4192 at lib/kobject.c:238 kobject_add_internal+0x8d4/0xbc0 [ 29.018770] Kernel panic - not syncing: panic_on_warn set ... [ 29.018770] [ 29.026120] CPU: 1 PID: 4192 Comm: syzkaller834824 Not tainted 4.16.0-rc6+ #1 [ 29.033371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.042703] Call Trace: [ 29.045273] dump_stack+0x194/0x24d [ 29.048877] ? arch_local_irq_restore+0x53/0x53 [ 29.053530] ? vsnprintf+0x1ed/0x1900 [ 29.057313] panic+0x1e4/0x41c [ 29.060481] ? refcount_error_report+0x214/0x214 [ 29.065224] ? show_regs_print_info+0x18/0x18 [ 29.069703] ? __warn+0x1c1/0x200 [ 29.073136] ? kobject_add_internal+0x8d4/0xbc0 [ 29.077783] __warn+0x1dc/0x200 [ 29.081040] ? kobject_add_internal+0x8d4/0xbc0 [ 29.085687] report_bug+0x1f4/0x2b0 [ 29.089301] fixup_bug.part.11+0x37/0x80 [ 29.093342] do_error_trap+0x2d7/0x3e0 [ 29.097206] ? vprintk_default+0x28/0x30 [ 29.101252] ? math_error+0x400/0x400 [ 29.105027] ? printk+0xaa/0xca [ 29.108283] ? show_regs_print_info+0x18/0x18 [ 29.112762] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.117586] do_invalid_op+0x1b/0x20 [ 29.121278] invalid_op+0x1b/0x40 [ 29.124707] RIP: 0010:kobject_add_internal+0x8d4/0xbc0 [ 29.129978] RSP: 0018:ffff8801cd3e7270 EFLAGS: 00010282 [ 29.135326] RAX: dffffc0000000008 RBX: ffff8801b8e23190 RCX: ffffffff815ad0de [ 29.142575] RDX: 0000000000000000 RSI: 1ffff10039a7cdfe RDI: 1ffff10039a7cdd3 [ 29.149821] RBP: ffff8801cd3e7368 R08: 1ffff10039a7cd95 R09: 0000000000000000 [ 29.157065] R10: ffff8801cd3e7030 R11: 0000000000000000 R12: 1ffff10039a7ce54 [ 29.164313] R13: 00000000ffffffef R14: ffff8801d6efc380 R15: 1ffff10039a7ce58 [ 29.171572] ? vprintk_func+0x5e/0xc0 [ 29.175357] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 29.180192] ? kobj_ns_type_registered+0x50/0x50 [ 29.184928] ? get_device_parent.isra.25+0x423/0x590 [ 29.190012] ? lock_downgrade+0x980/0x980 [ 29.194138] ? lock_release+0xa40/0xa40 [ 29.198095] kobject_add+0x132/0x1f0 [ 29.201788] ? kobject_add_internal+0xbc0/0xbc0 [ 29.206444] ? mutex_unlock+0xd/0x10 [ 29.210131] ? device_add+0x350/0x1650 [ 29.214002] device_add+0x35d/0x1650 [ 29.217699] ? device_private_init+0x230/0x230 [ 29.222257] ? kfree+0x1f6/0x260 [ 29.225606] ? kfree_const+0x36/0x40 [ 29.229302] device_create_groups_vargs+0x1f3/0x250 [ 29.234302] device_create_vargs+0x46/0x60 [ 29.238518] bdi_register_va.part.10+0xbb/0x8c0 [ 29.243166] ? wb_shutdown+0x430/0x430 [ 29.247038] ? bdi_init+0x3e3/0x4e0 [ 29.250639] ? wb_init+0xa20/0xa20 [ 29.254155] ? bdi_alloc_node+0x5c/0xc0 [ 29.258105] ? bdi_alloc_node+0x5c/0xc0 [ 29.262058] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.267055] ? kmem_cache_alloc_node_trace+0x36f/0x760 [ 29.272324] bdi_register_va+0x68/0x80 [ 29.276195] super_setup_bdi_name+0x136/0x230 [ 29.280670] ? kill_block_super+0xf0/0xf0 [ 29.284798] ? kmem_cache_alloc_trace+0x459/0x740 [ 29.289618] ? match_wildcard+0x390/0x390 [ 29.293756] fuse_fill_super+0xe75/0x1d60 [ 29.297888] ? fuse_get_root_inode+0x190/0x190 [ 29.302453] ? vsnprintf+0x1ed/0x1900 [ 29.306239] ? pointer+0x9c0/0x9c0 [ 29.309754] ? wait_for_completion+0x770/0x770 [ 29.314392] ? cap_capable+0x1b5/0x230 [ 29.318282] ? vsprintf+0x40/0x40 [ 29.321726] ? ns_capable_common+0xcf/0x160 [ 29.326042] ? set_blocksize+0x1f1/0x260 [ 29.330092] mount_bdev+0x2b7/0x370 [ 29.333697] ? mount_bdev+0x2b7/0x370 [ 29.337603] ? fuse_get_root_inode+0x190/0x190 [ 29.342175] fuse_mount_blk+0x34/0x40 [ 29.345964] mount_fs+0x66/0x2d0 [ 29.349329] vfs_kern_mount.part.26+0xc6/0x4a0 [ 29.353891] ? may_umount+0xa0/0xa0 [ 29.357505] ? _raw_read_unlock+0x22/0x30 [ 29.362267] ? __get_fs_type+0x8a/0xc0 [ 29.366141] do_mount+0xea4/0x2bb0 [ 29.369664] ? copy_mount_string+0x40/0x40 [ 29.373883] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.378880] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.383622] ? retint_kernel+0x10/0x10 [ 29.387502] ? copy_mount_options+0x18b/0x2e0 [ 29.391975] ? memset+0x31/0x40 [ 29.395233] ? copy_mount_options+0x1f7/0x2e0 [ 29.399712] SyS_mount+0xab/0x120 [ 29.403141] ? copy_mnt_ns+0xb30/0xb30 [ 29.407007] do_syscall_64+0x281/0x940 [ 29.410868] ? __do_page_fault+0xc90/0xc90 [ 29.415082] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.419819] ? syscall_return_slowpath+0x550/0x550 [ 29.424725] ? syscall_return_slowpath+0x2ac/0x550 [ 29.429634] ? prepare_exit_to_usermode+0x350/0x350 [ 29.434631] ? retint_user+0x18/0x18 [ 29.438324] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.443154] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.448328] RIP: 0033:0x4407c9 [ 29.451496] RSP: 002b:00007ffee445b638 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 29.459194] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004407c9 [ 29.466444] RDX: 00000000004a27dc RSI: 0000000020000180 RDI: 0000000020000240 [ 29.473689] RBP: 0030656c69662f2e R08: 00007ffee445b650 R09: 0000000000000000 [ 29.480933] R10: 0000000000800080 R11: 0000000000000202 R12: 00007ffee445b650 [ 29.488183] R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 [ 29.496000] Dumping ftrace buffer: [ 29.499678] (ftrace buffer empty) [ 29.503454] Kernel Offset: disabled [ 29.507062] Rebooting in 86400 seconds..