[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 72.233251][ T7159] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. [ 72.250833][ T7166] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 120.748621][T11822] ------------[ cut here ]------------ [ 120.754475][T11822] WARNING: CPU: 1 PID: 11822 at net/kcm/kcmsock.c:628 kcm_write_msgs+0xfb6/0x1760 [ 120.764034][T11822] Kernel panic - not syncing: panic_on_warn set ... [ 120.770641][T11822] CPU: 1 PID: 11822 Comm: syz-executor408 Not tainted 5.6.0-rc5-syzkaller #0 [ 120.779572][T11822] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 120.789655][T11822] Call Trace: [ 120.792962][T11822] dump_stack+0x188/0x20d [ 120.797354][T11822] ? kcm_write_msgs+0xf20/0x1760 [ 120.802336][T11822] panic+0x2e3/0x75c [ 120.806220][T11822] ? add_taint.cold+0x16/0x16 [ 120.810900][T11822] ? printk+0xba/0xed [ 120.814868][T11822] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 120.820338][T11822] ? __warn.cold+0x14/0x35 [ 120.824748][T11822] ? __warn+0xd5/0x1c8 [ 120.828844][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.833777][T11822] __warn.cold+0x2f/0x35 [ 120.838014][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.843287][T11822] report_bug+0x27b/0x2f0 [ 120.847626][T11822] do_error_trap+0x12b/0x220 [ 120.852202][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.857310][T11822] do_invalid_op+0x32/0x40 [ 120.861730][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.866866][T11822] invalid_op+0x23/0x30 [ 120.871150][T11822] RIP: 0010:kcm_write_msgs+0xfb6/0x1760 [ 120.876693][T11822] Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 05 00 00 48 8b 44 24 50 45 31 e4 48 8b 74 24 08 48 89 70 10 e9 95 f4 ff ff e8 7a 8a 53 fa <0f> 0b 41 bc ea ff ff ff e9 83 f4 ff ff e8 68 8a 53 fa 0f 0b e9 1c [ 120.896281][T11822] RSP: 0018:ffffc900015e7978 EFLAGS: 00010293 [ 120.902348][T11822] RAX: ffff888085688240 RBX: ffff88808571e800 RCX: ffffffff871e8c3c [ 120.910302][T11822] RDX: 0000000000000000 RSI: ffffffff871e9496 RDI: 0000000000000001 [ 120.918259][T11822] RBP: 0000000000000000 R08: ffff888085688240 R09: fffffbfff185158c [ 120.926216][T11822] R10: fffffbfff185158b R11: ffffffff8c28ac5f R12: 0000000000008000 [ 120.934174][T11822] R13: ffff8880a65b96c0 R14: 00000000000000c0 R15: ffff8880a6fe6d40 [ 120.942631][T11822] ? kcm_write_msgs+0x75c/0x1760 [ 120.947577][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.952522][T11822] ? kcm_write_msgs+0xfb6/0x1760 [ 120.957460][T11822] ? lockdep_hardirqs_on+0x417/0x5d0 [ 120.962737][T11822] kcm_sendmsg+0x1b67/0x2129 [ 120.967353][T11822] ? aa_label_sk_perm+0x89/0xe0 [ 120.972217][T11822] ? aa_sk_perm+0x319/0xab0 [ 120.976757][T11822] ? aa_af_perm+0x260/0x260 [ 120.981278][T11822] ? kcm_tx_work+0x160/0x160 [ 120.985908][T11822] ? lock_downgrade+0x7f0/0x7f0 [ 120.990760][T11822] ? kcm_tx_work+0x160/0x160 [ 120.995399][T11822] sock_sendmsg+0xcf/0x120 [ 120.999817][T11822] sock_write_iter+0x283/0x3c0 [ 121.004578][T11822] ? sock_sendmsg+0x120/0x120 [ 121.009261][T11822] ? find_held_lock+0x2d/0x110 [ 121.014172][T11822] ? __fget_files+0x307/0x4f0 [ 121.018850][T11822] new_sync_write+0x49c/0x700 [ 121.023516][T11822] ? new_sync_read+0x790/0x790 [ 121.028405][T11822] ? apparmor_path_rmdir+0x30/0x30 [ 121.033536][T11822] ? security_file_permission+0x8a/0x370 [ 121.039163][T11822] __vfs_write+0xc9/0x100 [ 121.043566][T11822] vfs_write+0x262/0x5c0 [ 121.047794][T11822] ksys_write+0x1e8/0x250 [ 121.052113][T11822] ? __ia32_sys_read+0xb0/0xb0 [ 121.056872][T11822] ? trace_hardirqs_off_caller+0x55/0x230 [ 121.062583][T11822] do_syscall_64+0xf6/0x7d0 [ 121.067076][T11822] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 121.072995][T11822] RIP: 0033:0x446b79 [ 121.076900][T11822] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 121.096587][T11822] RSP: 002b:00007f2e8f3e5d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 121.105005][T11822] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446b79 [ 121.112968][T11822] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 121.121068][T11822] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 121.129045][T11822] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 121.137089][T11822] R13: 00000000200003c0 R14: 00000000004aea28 R15: 000000000000d4f5 [ 121.146906][T11822] Kernel Offset: disabled [ 121.151743][T11822] Rebooting in 86400 seconds..