[ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. syzkaller login: [ 34.826350] audit: type=1400 audit(1601262145.215:8): avc: denied { execmem } for pid=6340 comm="syz-executor754" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 34.877623] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" [ 34.887406] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 34.899108] ------------[ cut here ]------------ [ 34.903306] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 34.903904] WARNING: CPU: 0 PID: 6350 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 34.903910] Kernel panic - not syncing: panic_on_warn set ... [ 34.903910] [ 34.903919] CPU: 0 PID: 6350 Comm: syz-executor754 Not tainted 4.14.198-syzkaller #0 [ 34.903923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.903931] Call Trace: [ 34.930612] ------------[ cut here ]------------ [ 34.934035] dump_stack+0x1b2/0x283 [ 34.943399] WARNING: CPU: 1 PID: 6349 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 34.945959] panic+0x1f9/0x42d [ 34.950688] Modules linked in: [ 34.954310] ? add_taint.cold+0x16/0x16 [ 34.962514] CPU: 1 PID: 6349 Comm: syz-executor754 Not tainted 4.14.198-syzkaller #0 [ 34.965691] ? sysfs_warn_dup.cold+0x17/0x2d [ 34.968850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.968857] task: ffff8880975c6340 task.stack: ffff8880982f8000 [ 34.972813] ? sysfs_warn_dup.cold+0x17/0x2d [ 34.980675] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 34.985062] __warn.cold+0x20/0x4b [ 34.994391] RSP: 0018:ffff8880982ff728 EFLAGS: 00010282 [ 35.000436] ? ist_end_non_atomic+0x10/0x10 [ 35.009814] ? sysfs_warn_dup.cold+0x17/0x2d [ 35.013321] RAX: 000000000000003a RBX: ffff888099f00710 RCX: 0000000000000000 [ 35.013328] RDX: 0000000000000000 RSI: ffffffff86ac12c0 RDI: ffffed101305fedb [ 35.018677] report_bug+0x208/0x249 [ 35.022965] RBP: ffff888087040680 R08: 000000000000003a R09: 0000000000000001 [ 35.027372] do_error_trap+0x195/0x2d0 [ 35.034625] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a5eff1c0 [ 35.041890] ? math_error+0x2d0/0x2d0 [ 35.045485] R13: ffff8880a11a5a80 R14: ffff888099f00730 R15: ffff88808d5c8698 [ 35.045493] FS: 0000000000798880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 35.052757] ? ___preempt_schedule+0x16/0x18 [ 35.056619] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.063893] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.067671] CR2: 00007ffe686a7d00 CR3: 00000000a3a71000 CR4: 00000000001406e0 [ 35.067679] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.074942] invalid_op+0x1b/0x40 [ 35.085065] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.085072] Call Trace: [ 35.089472] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 35.095340] sysfs_create_dir_ns+0x16f/0x1d0 [ 35.100153] RSP: 0018:ffff88808c9bf728 EFLAGS: 00010282 [ 35.107423] kobject_add_internal+0x279/0x810 [ 35.118139] kobject_init_and_add+0xde/0x120 [ 35.125391] RAX: 000000000000003a RBX: ffff88808d5c8690 RCX: 0000000000000000 [ 35.127979] ? kobject_create_and_add+0x200/0x200 [ 35.132961] RDX: 0000000000000000 RSI: ffffffff86ac12c0 RDI: ffffed1011937edb [ 35.132967] RBP: ffff888084732200 R08: 000000000000003a R09: 0000000000000000 [ 35.137365] ? vsnprintf+0x260/0x1340 [ 35.142713] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a5eff1c0 [ 35.147192] gfs2_sys_fs_add+0x184/0x3f0 [ 35.151580] R13: ffff888098242f00 R14: ffff88808d5c86b0 R15: ffff888098734658 [ 35.151601] ? sysfs_warn_dup.cold+0x17/0x2d [ 35.158853] ? recover_store+0x100/0x100 [ 35.163679] sysfs_create_dir_ns+0x16f/0x1d0 [ 35.170940] ? snprintf+0xa5/0xd0 [ 35.178191] kobject_add_internal+0x279/0x810 [ 35.181974] ? memcpy+0x35/0x50 [ 35.189231] kobject_init_and_add+0xde/0x120 [ 35.193272] fill_super+0x118b/0x2310 [ 35.200526] ? kobject_create_and_add+0x200/0x200 [ 35.204918] ? vsnprintf+0x260/0x1340 [ 35.208970] ? vsnprintf+0x260/0x1340 [ 35.213373] ? gfs2_online_uevent+0x1b0/0x1b0 [ 35.216804] gfs2_sys_fs_add+0x184/0x3f0 [ 35.221276] ? pointer+0x9e0/0x9e0 [ 35.224537] ? recover_store+0x100/0x100 [ 35.229017] ? snprintf+0xa5/0xd0 [ 35.232808] ? snprintf+0xa5/0xd0 [ 35.237629] ? vsprintf+0x30/0x30 [ 35.241435] ? memcpy+0x35/0x50 [ 35.245208] ? gfs2_open+0x160/0x160 [ 35.249680] fill_super+0x118b/0x2310 [ 35.256593] ? set_blocksize+0x125/0x380 [ 35.260113] ? vsnprintf+0x260/0x1340 [ 35.264157] gfs2_mount+0x439/0x502 [ 35.267583] ? gfs2_online_uevent+0x1b0/0x1b0 [ 35.271015] ? fill_super+0x2310/0x2310 [ 35.274444] ? pointer+0x9e0/0x9e0 [ 35.277715] mount_fs+0x92/0x2a0 [ 35.281387] ? snprintf+0xa5/0xd0 [ 35.285165] vfs_kern_mount.part.0+0x5b/0x470 [ 35.289199] ? vsprintf+0x30/0x30 [ 35.292977] do_mount+0xe53/0x2a00 [ 35.296579] ? gfs2_open+0x160/0x160 [ 35.301936] ? retint_kernel+0x2d/0x2d [ 35.305887] ? set_blocksize+0x125/0x380 [ 35.309404] ? copy_mount_string+0x40/0x40 [ 35.312749] gfs2_mount+0x439/0x502 [ 35.316175] ? memset+0x20/0x40 [ 35.320644] ? fill_super+0x2310/0x2310 [ 35.324078] ? copy_mount_options+0x1fa/0x2f0 [ 35.327656] mount_fs+0x92/0x2a0 [ 35.331326] ? copy_mnt_ns+0xa30/0xa30 [ 35.335213] vfs_kern_mount.part.0+0x5b/0x470 [ 35.339261] SyS_mount+0xa8/0x120 [ 35.343480] do_mount+0xe53/0x2a00 [ 35.347091] ? copy_mnt_ns+0xa30/0xa30 [ 35.350350] ? retint_kernel+0x2d/0x2d [ 35.357018] do_syscall_64+0x1d5/0x640 [ 35.361504] ? copy_mount_string+0x40/0x40 [ 35.364873] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 35.368739] ? memset+0x20/0x40 [ 35.373325] RIP: 0033:0x45c4da [ 35.376760] ? copy_mount_options+0x1fa/0x2f0 [ 35.380273] RSP: 002b:00007ffd8abb8588 EFLAGS: 00000293 [ 35.384151] ? copy_mnt_ns+0xa30/0xa30 [ 35.388011] ORIG_RAX: 00000000000000a5 [ 35.391887] SyS_mount+0xa8/0x120 [ 35.396093] RAX: ffffffffffffffda RBX: 00007ffd8abb85e0 RCX: 000000000045c4da [ 35.401361] ? copy_mnt_ns+0xa30/0xa30 [ 35.404617] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd8abb85a0 [ 35.407805] do_syscall_64+0x1d5/0x640 [ 35.412272] RBP: 00007ffd8abb85a0 R08: 00007ffd8abb85e0 R09: 0000000000000000 [ 35.417626] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 35.421487] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000918 [ 35.425443] RIP: 0033:0x45c4da [ 35.428878] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 35.428891] Code: [ 35.436326] RSP: 002b:00007ffd8abb8588 EFLAGS: 00000293 [ 35.440197] 56 [ 35.447450] ORIG_RAX: 00000000000000a5 [ 35.451315] 61 [ 35.458567] RAX: ffffffffffffffda RBX: 00007ffd8abb85e0 RCX: 000000000045c4da [ 35.463745] 8a [ 35.471000] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd8abb85a0 [ 35.471007] RBP: 00007ffd8abb85a0 R08: 00007ffd8abb85e0 R09: 0000000000000000 [ 35.474197] e8 [ 35.481451] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000918 [ 35.483582] 59 [ 35.488931] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 35.538579] 41 db ff eb d8 e8 52 41 db ff e9 6d ff ff ff e8 08 6e b1 ff 4c 89 ea 48 89 ee 48 c7 c7 a0 9d b5 86 e8 57 0d a0 ff <0f> 0b 48 89 ef 5d 41 5c 41 5d e9 67 16 db ff 90 90 90 90 90 90 [ 35.555978] ---[ end trace cd6903d6b6889fc6 ]--- [ 35.561822] Kernel Offset: disabled [ 35.565630] Rebooting in 86400 seconds..