[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.984600][ T28] audit: type=1800 audit(1577335477.318:25): pid=9204 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.005269][ T28] audit: type=1800 audit(1577335477.328:26): pid=9204 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 67.041397][ T28] audit: type=1800 audit(1577335477.328:27): pid=9204 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.244' (ECDSA) to the list of known hosts. syzkaller login: [ 78.824001][ T9362] IPVS: ftp: loaded support on port[0] = 21 [ 78.832715][ T9365] IPVS: ftp: loaded support on port[0] = 21 [ 78.840593][ T9367] IPVS: ftp: loaded support on port[0] = 21 [ 78.841035][ T9368] IPVS: ftp: loaded support on port[0] = 21 [ 78.858284][ T9370] IPVS: ftp: loaded support on port[0] = 21 [ 78.868214][ T9369] IPVS: ftp: loaded support on port[0] = 21 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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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 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 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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 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 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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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 [ 89.460163][T14529] ================================================================== [ 89.460209][T14529] BUG: KASAN: use-after-free in tty_open+0x6f8/0xbb0 [ 89.460219][T14529] Read of size 8 at addr ffff888098309200 by task syz-executor827/14529 [ 89.460223][T14529] [ 89.460237][T14529] CPU: 1 PID: 14529 Comm: syz-executor827 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 89.460244][T14529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.460248][T14529] Call Trace: [ 89.460262][T14529] dump_stack+0x197/0x210 [ 89.460273][T14529] ? tty_open+0x6f8/0xbb0 [ 89.460291][T14529] print_address_description.constprop.0.cold+0xd4/0x30b [ 89.460301][T14529] ? tty_open+0x6f8/0xbb0 [ 89.460311][T14529] ? tty_open+0x6f8/0xbb0 [ 89.460324][T14529] __kasan_report.cold+0x1b/0x41 [ 89.460336][T14529] ? tty_open+0x6f8/0xbb0 [ 89.460351][T14529] kasan_report+0x12/0x20 [ 89.460365][T14529] check_memory_region+0x134/0x1a0 [ 89.460382][T14529] __kasan_check_read+0x11/0x20 [ 89.460394][T14529] tty_open+0x6f8/0xbb0 [ 89.460413][T14529] ? tty_init_dev+0x470/0x470 [ 89.460435][T14529] ? do_raw_spin_unlock+0x181/0x270 [ 89.460449][T14529] ? tty_init_dev+0x470/0x470 [ 89.460470][T14529] chrdev_open+0x245/0x6b0 [ 89.579857][T14529] ? cdev_put.part.0+0x50/0x50 [ 89.584618][T14529] ? security_file_open+0x87/0x300 [ 89.589723][T14529] do_dentry_open+0x4ca/0x1350 [ 89.594475][T14529] ? __kasan_check_read+0x11/0x20 [ 89.599489][T14529] ? cdev_put.part.0+0x50/0x50 [ 89.604252][T14529] ? chown_common+0x5c0/0x5c0 [ 89.608937][T14529] ? inode_permission+0xb4/0x520 [ 89.613872][T14529] vfs_open+0xa0/0xd0 [ 89.617855][T14529] path_openat+0x12fd/0x34d0 [ 89.622455][T14529] ? path_lookupat.isra.0+0x8c0/0x8c0 [ 89.627837][T14529] ? __alloc_fd+0x487/0x620 [ 89.632337][T14529] do_filp_open+0x192/0x260 [ 89.636837][T14529] ? may_open_dev+0x100/0x100 [ 89.641520][T14529] ? _raw_spin_unlock+0x28/0x40 [ 89.646380][T14529] do_sys_openat2+0x633/0x840 [ 89.651054][T14529] ? file_open_root+0x5f0/0x5f0 [ 89.655898][T14529] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.662142][T14529] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 89.668297][T14529] do_sys_open+0xfc/0x190 [ 89.672616][T14529] ? filp_open+0x80/0x80 [ 89.676853][T14529] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 89.682306][T14529] ? do_syscall_64+0x26/0x790 [ 89.686971][T14529] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.693031][T14529] ? do_syscall_64+0x26/0x790 [ 89.697719][T14529] __x64_sys_open+0x7e/0xc0 [ 89.702214][T14529] do_syscall_64+0xfa/0x790 [ 89.706708][T14529] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.712585][T14529] RIP: 0033:0x401900 [ 89.716479][T14529] Code: 48 83 c4 08 48 3d 01 f0 ff ff 0f 83 ba 0b 00 00 c3 66 0f 1f 84 00 00 00 00 00 83 3d 8d 86 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 [ 89.736067][T14529] RSP: 002b:00007ffd4560ed08 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 89.744466][T14529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401900 [ 89.752426][T14529] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd4560ed30 [ 89.760385][T14529] RBP: 00007ffd4560edf0 R08: 0000000000000000 R09: 000000000000000d [ 89.768348][T14529] R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000015d0e [ 89.776305][T14529] R13: 0000000000000004 R14: 00007ffd4560ee20 R15: 0000000000000000 [ 89.784286][T14529] [ 89.786603][T14529] Allocated by task 14526: [ 89.791017][T14529] save_stack+0x23/0x90 [ 89.795171][T14529] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 89.800799][T14529] kasan_kmalloc+0x9/0x10 [ 89.805120][T14529] kmem_cache_alloc_trace+0x158/0x790 [ 89.810481][T14529] vc_allocate+0x1fc/0x760 [ 89.814903][T14529] con_install+0x52/0x410 [ 89.819234][T14529] tty_init_dev+0xf9/0x470 [ 89.823645][T14529] tty_open+0x4a5/0xbb0 [ 89.827790][T14529] chrdev_open+0x245/0x6b0 [ 89.832201][T14529] do_dentry_open+0x4ca/0x1350 [ 89.836953][T14529] vfs_open+0xa0/0xd0 [ 89.840923][T14529] path_openat+0x12fd/0x34d0 [ 89.845606][T14529] do_filp_open+0x192/0x260 [ 89.850535][T14529] do_sys_openat2+0x633/0x840 [ 89.855199][T14529] do_sys_open+0xfc/0x190 [ 89.859520][T14529] __x64_sys_open+0x7e/0xc0 [ 89.864011][T14529] do_syscall_64+0xfa/0x790 [ 89.868608][T14529] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.874494][T14529] [ 89.876810][T14529] Freed by task 14529: [ 89.880870][T14529] save_stack+0x23/0x90 [ 89.885019][T14529] __kasan_slab_free+0x102/0x150 [ 89.889949][T14529] kasan_slab_free+0xe/0x10 [ 89.894443][T14529] kfree+0x10a/0x2c0 [ 89.898336][T14529] vt_disallocate_all+0x2bd/0x3e0 [ 89.903348][T14529] vt_ioctl+0xc38/0x26d0 [ 89.907576][T14529] tty_ioctl+0xa37/0x14f0 [ 89.911893][T14529] ksys_ioctl+0x123/0x180 [ 89.916210][T14529] __x64_sys_ioctl+0x73/0xb0 [ 89.920789][T14529] do_syscall_64+0xfa/0x790 [ 89.925281][T14529] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.931156][T14529] [ 89.933483][T14529] The buggy address belongs to the object at ffff888098309000 [ 89.933483][T14529] which belongs to the cache kmalloc-2k of size 2048 [ 89.947554][T14529] The buggy address is located 512 bytes inside of [ 89.947554][T14529] 2048-byte region [ffff888098309000, ffff888098309800) [ 89.961015][T14529] The buggy address belongs to the page: [ 89.966650][T14529] page:ffffea000260c240 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 89.975755][T14529] raw: 00fffe0000000200 ffffea0002569f48 ffffea00023d4ac8 ffff8880aa400e00 [ 89.984337][T14529] raw: 0000000000000000 ffff888098309000 0000000100000001 0000000000000000 [ 89.992902][T14529] page dumped because: kasan: bad access detected [ 89.999297][T14529] [ 90.001718][T14529] Memory state around the buggy address: [ 90.007351][T14529] ffff888098309100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.015420][T14529] ffff888098309180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.023476][T14529] >ffff888098309200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.031531][T14529] ^ [ 90.035716][T14529] ffff888098309280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.043764][T14529] ffff888098309300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.051825][T14529] ================================================================== [ 90.059866][T14529] Disabling lock debugging due to kernel taint [ 90.074802][T14529] Kernel panic - not syncing: panic_on_warn set ... [ 90.081538][T14529] CPU: 0 PID: 14529 Comm: syz-executor827 Tainted: G B 5.5.0-rc2-next-20191220-syzkaller #0 [ 90.092897][T14529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.102946][T14529] Call Trace: [ 90.106239][T14529] dump_stack+0x197/0x210 [ 90.110582][T14529] panic+0x2e3/0x75c [ 90.114479][T14529] ? add_taint.cold+0x16/0x16 [ 90.119153][T14529] ? tty_open+0x6f8/0xbb0 [ 90.123487][T14529] ? preempt_schedule+0x4b/0x60 [ 90.128334][T14529] ? ___preempt_schedule+0x16/0x18 [ 90.133444][T14529] ? trace_hardirqs_on+0x5e/0x240 [ 90.138469][T14529] ? tty_open+0x6f8/0xbb0 [ 90.142801][T14529] end_report+0x47/0x4f [ 90.147004][T14529] ? tty_open+0x6f8/0xbb0 [ 90.151309][T14529] __kasan_report.cold+0xe/0x41 [ 90.156174][T14529] ? tty_open+0x6f8/0xbb0 [ 90.160515][T14529] kasan_report+0x12/0x20 [ 90.164862][T14529] check_memory_region+0x134/0x1a0 [ 90.169946][T14529] __kasan_check_read+0x11/0x20 [ 90.174812][T14529] tty_open+0x6f8/0xbb0 [ 90.178942][T14529] ? tty_init_dev+0x470/0x470 [ 90.183608][T14529] ? do_raw_spin_unlock+0x181/0x270 [ 90.188779][T14529] ? tty_init_dev+0x470/0x470 [ 90.193431][T14529] chrdev_open+0x245/0x6b0 [ 90.197825][T14529] ? cdev_put.part.0+0x50/0x50 [ 90.202604][T14529] ? security_file_open+0x87/0x300 [ 90.207692][T14529] do_dentry_open+0x4ca/0x1350 [ 90.212465][T14529] ? __kasan_check_read+0x11/0x20 [ 90.217463][T14529] ? cdev_put.part.0+0x50/0x50 [ 90.222200][T14529] ? chown_common+0x5c0/0x5c0 [ 90.226853][T14529] ? inode_permission+0xb4/0x520 [ 90.231766][T14529] vfs_open+0xa0/0xd0 [ 90.235764][T14529] path_openat+0x12fd/0x34d0 [ 90.240346][T14529] ? path_lookupat.isra.0+0x8c0/0x8c0 [ 90.245708][T14529] ? __alloc_fd+0x487/0x620 [ 90.250186][T14529] do_filp_open+0x192/0x260 [ 90.254664][T14529] ? may_open_dev+0x100/0x100 [ 90.259322][T14529] ? _raw_spin_unlock+0x28/0x40 [ 90.264165][T14529] do_sys_openat2+0x633/0x840 [ 90.268818][T14529] ? file_open_root+0x5f0/0x5f0 [ 90.273665][T14529] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 90.279892][T14529] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 90.286046][T14529] do_sys_open+0xfc/0x190 [ 90.290350][T14529] ? filp_open+0x80/0x80 [ 90.294584][T14529] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 90.300034][T14529] ? do_syscall_64+0x26/0x790 [ 90.304691][T14529] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.310763][T14529] ? do_syscall_64+0x26/0x790 [ 90.315423][T14529] __x64_sys_open+0x7e/0xc0 [ 90.319907][T14529] do_syscall_64+0xfa/0x790 [ 90.324385][T14529] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.330252][T14529] RIP: 0033:0x401900 [ 90.334127][T14529] Code: 48 83 c4 08 48 3d 01 f0 ff ff 0f 83 ba 0b 00 00 c3 66 0f 1f 84 00 00 00 00 00 83 3d 8d 86 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 [ 90.353705][T14529] RSP: 002b:00007ffd4560ed08 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 90.362092][T14529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401900 [ 90.370079][T14529] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffd4560ed30 [ 90.378026][T14529] RBP: 00007ffd4560edf0 R08: 0000000000000000 R09: 000000000000000d [ 90.385973][T14529] R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000015d0e [ 90.393919][T14529] R13: 0000000000000004 R14: 00007ffd4560ee20 R15: 0000000000000000 [ 90.402556][T14529] Kernel Offset: disabled [ 90.406876][T14529] Rebooting in 86400 seconds..