Starting OpenBSD Secure Shell server... [ OK ] Started Daily Cleanup of Temporary Directories. [ OK ] Reached target Timers. [ OK ] Started Regular background program processing daemon. Starting System Logging Service... [ OK ] Started Permit User Sessions. [ OK ] Found device /dev/ttyS0. [ OK ] Started System Logging Service. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.171' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.716448][ T34] audit: type=1400 audit(1606050904.316:8): avc: denied { execmem } for pid=8485 comm="syz-executor239" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 74.733276][ T8486] IPVS: ftp: loaded support on port[0] = 21 [ 75.227505][ T47] general protection fault, probably for non-canonical address 0xfe03fc3c1e04003c: 0000 [#1] PREEMPT SMP KASAN [ 75.239237][ T47] KASAN: maybe wild-memory-access in range [0xf02001e0f02001e0-0xf02001e0f02001e7] [ 75.248498][ T47] CPU: 1 PID: 47 Comm: kworker/u4:3 Not tainted 5.10.0-rc4-syzkaller #0 [ 75.256796][ T47] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.266845][ T47] Workqueue: tc_filter_workqueue tcindex_destroy_rexts_work [ 75.274132][ T47] RIP: 0010:tcf_action_destroy+0xbc/0x1b0 [ 75.279832][ T47] Code: 83 c4 01 bf 20 00 00 00 48 83 c3 08 44 89 e6 e8 1a 9b 5d fa 41 83 fc 20 0f 84 ac 00 00 00 e8 bb a2 5d fa 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 ac 00 00 00 48 8b 2b 48 85 ed 0f 84 89 00 00 [ 75.299434][ T47] RSP: 0018:ffffc90000f27c88 EFLAGS: 00010a06 [ 75.305483][ T47] RAX: 1e04003c1e04003c RBX: f02001e0f02001e0 RCX: 0000000000000000 [ 75.313435][ T47] RDX: ffff888011298080 RSI: ffffffff87128ea5 RDI: f02001e0f02001e0 [ 75.321388][ T47] RBP: ffff888038c00008 R08: 0000000000000000 R09: ffffffff8c92a8e7 [ 75.329342][ T47] R10: fffffbfff192551c R11: 0000000000000000 R12: 0000000000000000 [ 75.337293][ T47] R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000 [ 75.345392][ T47] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 75.354318][ T47] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.360888][ T47] CR2: 00000000200001c0 CR3: 0000000019a1f000 CR4: 00000000001506e0 [ 75.368842][ T47] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.376822][ T47] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.385058][ T47] Call Trace: [ 75.388364][ T47] tcf_exts_destroy+0x42/0xc0 [ 75.393140][ T47] __tcindex_destroy_rexts+0x16/0x210 [ 75.398506][ T47] tcindex_destroy_rexts_work+0x17/0x20 [ 75.404067][ T47] process_one_work+0x933/0x15a0 [ 75.409180][ T47] ? lock_release+0x710/0x710 [ 75.413868][ T47] ? pwq_dec_nr_in_flight+0x320/0x320 [ 75.419230][ T47] ? rwlock_bug.part.0+0x90/0x90 [ 75.424165][ T47] ? _raw_spin_lock_irq+0x41