[ 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 '10.128.0.231' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 51.567675][ T7073] 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. [ 51.582991][ T7081] 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 [ 58.408460][ T7722] ------------[ cut here ]------------ [ 58.414145][ T7722] WARNING: CPU: 0 PID: 7722 at net/kcm/kcmsock.c:630 kcm_write_msgs+0xfb6/0x1760 [ 58.423273][ T7722] Kernel panic - not syncing: panic_on_warn set ... [ 58.429850][ T7722] CPU: 0 PID: 7722 Comm: syz-executor600 Not tainted 5.6.0-rc5-syzkaller #0 [ 58.438508][ T7722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.448539][ T7722] Call Trace: [ 58.451811][ T7722] dump_stack+0x188/0x20d [ 58.456123][ T7722] ? kcm_write_msgs+0xf20/0x1760 [ 58.461154][ T7722] panic+0x2e3/0x75c [ 58.465033][ T7722] ? add_taint.cold+0x16/0x16 [ 58.469692][ T7722] ? printk+0xba/0xed [ 58.473653][ T7722] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 58.479087][ T7722] ? __warn.cold+0x14/0x35 [ 58.483477][ T7722] ? __warn+0xd5/0x1c8 [ 58.487531][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.492444][ T7722] __warn.cold+0x2f/0x35 [ 58.496666][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.501580][ T7722] report_bug+0x27b/0x2f0 [ 58.505890][ T7722] do_error_trap+0x12b/0x220 [ 58.510456][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.515373][ T7722] do_invalid_op+0x32/0x40 [ 58.519764][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.524679][ T7722] invalid_op+0x23/0x30 [ 58.528812][ T7722] RIP: 0010:kcm_write_msgs+0xfb6/0x1760 [ 58.534422][ T7722] 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 2a 09 58 fa <0f> 0b 41 bc ea ff ff ff e9 83 f4 ff ff e8 18 09 58 fa 0f 0b e9 1c [ 58.554024][ T7722] RSP: 0018:ffffc90001727978 EFLAGS: 00010293 [ 58.560070][ T7722] RAX: ffff8880917ac580 RBX: ffff888097ef6000 RCX: ffffffff871a043c [ 58.568026][ T7722] RDX: 0000000000000000 RSI: ffffffff871a0c96 RDI: 0000000000000001 [ 58.575976][ T7722] RBP: 0000000000000000 R08: ffff8880917ac580 R09: fffffbfff180e58c [ 58.583949][ T7722] R10: fffffbfff180e58b R11: ffffffff8c072c5f R12: 0000000000008000 [ 58.591899][ T7722] R13: ffff88808f2e7c80 R14: 00000000000000c0 R15: ffff888098702080 [ 58.599866][ T7722] ? kcm_write_msgs+0x75c/0x1760 [ 58.604797][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.609721][ T7722] ? kcm_write_msgs+0xfb6/0x1760 [ 58.614665][ T7722] ? lockdep_hardirqs_on+0x417/0x5d0 [ 58.619945][ T7722] kcm_sendmsg+0x1b67/0x2129 [ 58.624521][ T7722] ? aa_label_sk_perm+0x89/0xe0 [ 58.629367][ T7722] ? aa_sk_perm+0x319/0xab0 [ 58.633858][ T7722] ? aa_af_perm+0x260/0x260 [ 58.638340][ T7722] ? kcm_tx_work+0x160/0x160 [ 58.642906][ T7722] ? lock_downgrade+0x7f0/0x7f0 [ 58.647747][ T7722] ? kcm_tx_work+0x160/0x160 [ 58.652317][ T7722] sock_sendmsg+0xcf/0x120 [ 58.656731][ T7722] sock_write_iter+0x283/0x3c0 [ 58.661476][ T7722] ? sock_sendmsg+0x120/0x120 [ 58.666145][ T7722] ? find_held_lock+0x2d/0x110 [ 58.670976][ T7722] ? __fget_files+0x307/0x4f0 [ 58.675636][ T7722] new_sync_write+0x49c/0x700 [ 58.680291][ T7722] ? new_sync_read+0x790/0x790 [ 58.685061][ T7722] ? apparmor_path_rmdir+0x30/0x30 [ 58.690185][ T7722] ? security_file_permission+0x8a/0x370 [ 58.695799][ T7722] __vfs_write+0xc9/0x100 [ 58.700137][ T7722] vfs_write+0x262/0x5c0 [ 58.704460][ T7722] ksys_write+0x1e8/0x250 [ 58.708789][ T7722] ? __ia32_sys_read+0xb0/0xb0 [ 58.713545][ T7722] ? trace_hardirqs_off_caller+0x55/0x230 [ 58.719248][ T7722] do_syscall_64+0xf6/0x7d0 [ 58.723840][ T7722] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.729707][ T7722] RIP: 0033:0x446b79 [ 58.733583][ T7722] 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 [ 58.753166][ T7722] RSP: 002b:00007fd21ba08d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 58.761554][ T7722] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446b79 [ 58.769501][ T7722] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 58.777449][ T7722] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 58.785396][ T7722] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c [ 58.793346][ T7722] R13: 00000000200003c0 R14: 00000000004aea28 R15: 000000000000d4f5 [ 58.802683][ T7722] Kernel Offset: disabled [ 58.807055][ T7722] Rebooting in 86400 seconds..