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 '10.128.10.19' (ECDSA) to the list of known hosts. syzkaller login: [ 31.312229] gfs2: fsid=user.: Trying to join cluster "lock_nolock", "user." [ 31.319437] gfs2: fsid=user.: Now mounting FS... [ 31.322535] sysfs: cannot create duplicate filename '/fs/gfs2/user.' [ 31.330726] CPU: 0 PID: 4490 Comm: syzkaller869138 Not tainted 4.16.0+ #3 [ 31.331049] attempt to access beyond end of device [ 31.337635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.337639] Call Trace: [ 31.337653] dump_stack+0x1b9/0x294 [ 31.337663] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.337672] ? trace_hardirqs_on+0xd/0x10 [ 31.337688] sysfs_warn_dup.cold.3+0x1c/0x2b [ 31.342629] loop0: rw=4096, want=136, limit=13 [ 31.351944] sysfs_create_dir_ns+0x184/0x1d0 [ 31.351958] kobject_add_internal+0x353/0xba0 [ 31.351969] ? kobj_ns_type_registered+0x60/0x60 [ 31.351982] ? kfree_const+0x59/0x70 [ 31.354556] gfs2: error 10 reading superblock [ 31.358145] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.358154] ? kfree+0x1e9/0x260 [ 31.358162] ? kfree_const+0x5e/0x70 [ 31.358173] kobject_init_and_add+0xed/0x130 [ 31.363368] gfs2: fsid=user.: can't read superblock [ 31.367464] ? kobject_add_internal+0xba0/0xba0 [ 31.367473] ? vsnprintf+0x242/0x1b40 [ 31.367486] gfs2_sys_fs_add+0x1ff/0x500 [ 31.367500] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.371902] gfs2: fsid=user.: can't read superblock: -5 [ 31.376448] ? recover_store+0x190/0x190 [ 31.376461] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.376473] ? snprintf+0xa5/0xd0 [ 31.455878] ? vscnprintf+0x60/0x80 [ 31.459492] ? memcpy+0x45/0x50 [ 31.462763] fill_super+0x8c9/0x1a40 [ 31.466462] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.471986] ? vsnprintf+0x242/0x1b40 [ 31.475771] ? gfs2_online_uevent+0x2b0/0x2b0 [ 31.480249] ? gfs2_mount_args+0x962/0xae0 [ 31.484467] ? snprintf+0xa5/0xd0 [ 31.487900] ? vsprintf+0x40/0x40 [ 31.491338] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.496335] ? set_blocksize+0x2c4/0x350 [ 31.500382] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.505904] gfs2_mount+0x5e6/0x712 [ 31.509516] ? fill_super+0x1a40/0x1a40 [ 31.513483] mount_fs+0xae/0x328 [ 31.516836] vfs_kern_mount.part.34+0xd4/0x4d0 [ 31.521402] ? may_umount+0xb0/0xb0 [ 31.525013] ? _raw_read_unlock+0x22/0x30 [ 31.529147] ? __get_fs_type+0x97/0xc0 [ 31.533020] do_mount+0x564/0x3070 [ 31.536547] ? copy_mount_string+0x40/0x40 [ 31.540764] ? rcu_pm_notify+0xc0/0xc0 [ 31.544639] ? copy_mount_options+0x5f/0x380 [ 31.549032] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.554034] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.558863] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.564380] ? copy_mount_options+0x285/0x380 [ 31.568859] ksys_mount+0x12d/0x140 [ 31.572468] SyS_mount+0x35/0x50 [ 31.575816] ? ksys_mount+0x140/0x140 [ 31.579600] do_syscall_64+0x29e/0x9d0 [ 31.583469] ? vmalloc_sync_all+0x30/0x30 [ 31.587598] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.592425] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.597341] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.602262] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.607613] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.612441] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.617611] RIP: 0033:0x44327a [ 31.620785] RSP: 002b:00007ffdfe982d48 EFLAGS: 00000217 ORIG_RAX: 00000000000000a5 [ 31.628477] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044327a [ 31.635728] RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 00007ffdfe982d60 [ 31.642981] RBP: 0000000020000198 R08: 0000000020001480 R09: 000000000000000a [ 31.650232] R10: 0000000000800000 R11: 0000000000000217 R12: 6c6261746b636f6c [ 31.657490] R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 [ 31.664924] ------------[ cut here ]------------ [ 31.666877] gfs2: fsid=user.: Trying to join cluster "lock_nolock", "user." [ 31.669683] kobject_add_internal failed for user. with -EEXIST, don't try to register things with the same name in the same directory. [ 31.669931] WARNING: CPU: 0 PID: 4490 at lib/kobject.c:238 kobject_add_internal+0x8e0/0xba0 [ 31.676839] gfs2: fsid=user.: Now mounting FS... [ 31.689004] Kernel panic - not syncing: panic_on_warn set ... [ 31.689004] [ 31.689016] CPU: 0 PID: 4490 Comm: syzkaller869138 Not tainted 4.16.0+ #3 [ 31.689021] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.689024] Call Trace: [ 31.689037] dump_stack+0x1b9/0x294 [ 31.689047] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.689061] ? kobject_add_internal+0x820/0xba0 [ 31.700459] sysfs: cannot create duplicate filename '/fs/gfs2/user.' [ 31.702283] panic+0x22f/0x4de [ 31.702292] ? add_taint.cold.5+0x16/0x16 [ 31.702302] ? __warn.cold.8+0x148/0x1b3 [ 31.702316] ? __warn.cold.8+0x117/0x1b3 [ 31.763745] ? kobject_add_internal+0x8e0/0xba0 [ 31.768398] __warn.cold.8+0x163/0x1b3 [ 31.772274] ? kobject_add_internal+0x8e0/0xba0 [ 31.776946] report_bug+0x252/0x2d0 [ 31.780565] do_error_trap+0x1de/0x490 [ 31.784439] ? math_error+0x420/0x420 [ 31.788227] ? vprintk_default+0x28/0x30 [ 31.792275] ? printk+0x9e/0xba [ 31.795542] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.800372] do_invalid_op+0x1b/0x20 [ 31.804068] invalid_op+0x1b/0x40 [ 31.807503] RIP: 0010:kobject_add_internal+0x8e0/0xba0 [ 31.812931] RSP: 0018:ffff8801acec7480 EFLAGS: 00010286 [ 31.818275] RAX: 000000000000007a RBX: ffff8801ad04d1d0 RCX: 1ffff100359c19e3 [ 31.825621] RDX: 0000000000000000 RSI: ffffffff815fa5a1 RDI: 0000000000000293 [ 31.832877] RBP: ffff8801acec7578 R08: ffff8801ace0cef8 R09: 0000000000000006 [ 31.840151] R10: ffff8801ace0c6c0 R11: 0000000000000000 R12: 00000000ffffffef [ 31.847404] R13: ffff8801d3a02948 R14: 1ffff100359d8e9a R15: ffff8801d3a02900 [ 31.854665] ? vprintk_func+0x81/0xe7 [ 31.858451] ? kobj_ns_type_registered+0x60/0x60 [ 31.863190] ? kfree_const+0x59/0x70 [ 31.866888] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.871886] ? kfree+0x1e9/0x260 [ 31.875242] ? kfree_const+0x5e/0x70 [ 31.878941] kobject_init_and_add+0xed/0x130 [ 31.883335] ? kobject_add_internal+0xba0/0xba0 [ 31.887990] ? vsnprintf+0x242/0x1b40 [ 31.891776] gfs2_sys_fs_add+0x1ff/0x500 [ 31.895826] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.901348] ? recover_store+0x190/0x190 [ 31.905396] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.910917] ? snprintf+0xa5/0xd0 [ 31.914362] ? vscnprintf+0x60/0x80 [ 31.917974] ? memcpy+0x45/0x50 [ 31.921240] fill_super+0x8c9/0x1a40 [ 31.924940] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.930460] ? vsnprintf+0x242/0x1b40 [ 31.934250] ? gfs2_online_uevent+0x2b0/0x2b0 [ 31.938734] ? gfs2_mount_args+0x962/0xae0 [ 31.942957] ? snprintf+0xa5/0xd0 [ 31.946411] ? vsprintf+0x40/0x40 [ 31.949850] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.954852] ? set_blocksize+0x2c4/0x350 [ 31.958902] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.964521] gfs2_mount+0x5e6/0x712 [ 31.968136] ? fill_super+0x1a40/0x1a40 [ 31.972104] mount_fs+0xae/0x328 [ 31.975456] vfs_kern_mount.part.34+0xd4/0x4d0 [ 31.980020] ? may_umount+0xb0/0xb0 [ 31.983629] ? _raw_read_unlock+0x22/0x30 [ 31.987763] ? __get_fs_type+0x97/0xc0 [ 31.991645] do_mount+0x564/0x3070 [ 31.995169] ? copy_mount_string+0x40/0x40 [ 31.999389] ? rcu_pm_notify+0xc0/0xc0 [ 32.003262] ? copy_mount_options+0x5f/0x380 [ 32.007651] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.012654] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.017485] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.023004] ? copy_mount_options+0x285/0x380 [ 32.027482] ksys_mount+0x12d/0x140 [ 32.031091] SyS_mount+0x35/0x50 [ 32.034447] ? ksys_mount+0x140/0x140 [ 32.038581] do_syscall_64+0x29e/0x9d0 [ 32.042451] ? vmalloc_sync_all+0x30/0x30 [ 32.046586] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.051413] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.056327] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.061255] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.066606] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.071435] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.076606] RIP: 0033:0x44327a [ 32.079775] RSP: 002b:00007ffdfe982d48 EFLAGS: 00000217 ORIG_RAX: 00000000000000a5 [ 32.087465] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044327a [ 32.094718] RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 00007ffdfe982d60 [ 32.101972] RBP: 0000000020000198 R08: 0000000020001480 R09: 000000000000000a [ 32.109224] R10: 0000000000800000 R11: 0000000000000217 R12: 6c6261746b636f6c [ 32.116475] R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 [ 32.123746] CPU: 1 PID: 4488 Comm: syzkaller869138 Not tainted 4.16.0+ #3 [ 32.130681] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.140108] Call Trace: [ 32.142684] dump_stack+0x1b9/0x294 [ 32.146296] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.151468] ? trace_hardirqs_on+0xd/0x10 [ 32.155604] sysfs_warn_dup.cold.3+0x1c/0x2b [ 32.160002] sysfs_create_dir_ns+0x184/0x1d0 [ 32.164403] kobject_add_internal+0x353/0xba0 [ 32.168897] ? kobj_ns_type_registered+0x60/0x60 [ 32.173634] ? kfree_const+0x59/0x70 [ 32.177334] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.182331] ? kfree+0x1e9/0x260 [ 32.185681] ? kfree_const+0x5e/0x70 [ 32.189378] kobject_init_and_add+0xed/0x130 [ 32.193768] ? kobject_add_internal+0xba0/0xba0 [ 32.198418] ? vsnprintf+0x242/0x1b40 [ 32.202204] gfs2_sys_fs_add+0x1ff/0x500 [ 32.206251] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.211769] ? recover_store+0x190/0x190 [ 32.215900] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.221417] ? snprintf+0xa5/0xd0 [ 32.224849] ? vscnprintf+0x60/0x80 [ 32.228460] ? memcpy+0x45/0x50 [ 32.231723] fill_super+0x8c9/0x1a40 [ 32.235419] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.240935] ? vsnprintf+0x242/0x1b40 [ 32.244719] ? gfs2_online_uevent+0x2b0/0x2b0 [ 32.249196] ? gfs2_mount_args+0x962/0xae0 [ 32.253413] ? snprintf+0xa5/0xd0 [ 32.256846] ? vsprintf+0x40/0x40 [ 32.260281] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.265284] ? set_blocksize+0x2c4/0x350 [ 32.269331] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.274848] gfs2_mount+0x5e6/0x712 [ 32.278457] ? fill_super+0x1a40/0x1a40 [ 32.282426] mount_fs+0xae/0x328 [ 32.285777] vfs_kern_mount.part.34+0xd4/0x4d0 [ 32.290340] ? may_umount+0xb0/0xb0 [ 32.293952] ? _raw_read_unlock+0x22/0x30 [ 32.298080] ? __get_fs_type+0x97/0xc0 [ 32.301950] do_mount+0x564/0x3070 [ 32.305904] ? copy_mount_string+0x40/0x40 [ 32.310120] ? rcu_pm_notify+0xc0/0xc0 [ 32.313990] ? copy_mount_options+0x5f/0x380 [ 32.318381] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.323389] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.328223] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.333744] ? _copy_from_user+0xdf/0x150 [ 32.337875] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.343399] ? copy_mount_options+0x285/0x380 [ 32.347876] ksys_mount+0x12d/0x140 [ 32.351488] SyS_mount+0x35/0x50 [ 32.354834] ? ksys_mount+0x140/0x140 [ 32.358617] do_syscall_64+0x29e/0x9d0 [ 32.362492] ? vmalloc_sync_all+0x30/0x30 [ 32.366624] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.371362] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.376275] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.381190] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.386535] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.391362] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.396531] RIP: 0033:0x44327a [ 32.399704] RSP: 002b:00007ffdfe982d48 EFLAGS: 00000217 ORIG_RAX: 00000000000000a5 [ 32.407391] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044327a [ 32.414639] RDX: 00000000200000c0 RSI: 0000000020000100 RDI: 00007ffdfe982d60 [ 32.421891] RBP: 0000000020000198 R08: 0000000020001480 R09: 000000000000000a [ 32.429141] R10: 0000000000800000 R11: 0000000000000217 R12: 6c6261746b636f6c [ 32.436390] R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 [ 32.444040] Dumping ftrace buffer: [ 32.447755] (ftrace buffer empty) [ 32.451630] Kernel Offset: disabled [ 32.455254] Rebooting in 86400 seconds..