[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.839614][ T27] audit: type=1800 audit(1578701535.015:25): pid=9441 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 82.875051][ T27] audit: type=1800 audit(1578701535.015:26): pid=9441 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 82.916096][ T27] audit: type=1800 audit(1578701535.015:27): pid=9441 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 '10.128.0.82' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 93.014135][ T9596] kasan: CONFIG_KASAN_INLINE enabled [ 93.020064][ T9596] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 93.028445][ T9596] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 93.035577][ T9596] CPU: 1 PID: 9596 Comm: syz-executor391 Not tainted 5.5.0-rc5-syzkaller #0 [ 93.044286][ T9596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.055087][ T9596] RIP: 0010:xt_rateest_put+0xa1/0x440 [ 93.060446][ T9596] Code: 65 b8 fd fa 45 84 f6 0f 84 68 02 00 00 e8 17 b7 fd fa 49 8d bd a8 13 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 6c 03 00 00 4d 8b b5 a8 13 00 00 e8 09 f0 e9 fa [ 93.080439][ T9596] RSP: 0018:ffffc90001a67940 EFLAGS: 00010202 [ 93.086727][ T9596] RAX: dffffc0000000000 RBX: ffff8880a7cfc900 RCX: ffffffff86777d02 [ 93.096649][ T9596] RDX: 0000000000000275 RSI: ffffffff86777a89 RDI: 00000000000013a8 [ 93.105392][ T9596] RBP: ffffc90001a67970 R08: ffff88809dd36000 R09: ffffed1015d2703d [ 93.113571][ T9596] R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: 000000000000002d [ 93.121829][ T9596] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff86777e40 [ 93.129919][ T9596] FS: 0000000001d2b880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 93.138861][ T9596] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 93.145605][ T9596] CR2: 00000000200008e0 CR3: 000000009efe9000 CR4: 00000000001406e0 [ 93.153737][ T9596] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 93.162015][ T9596] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 93.170479][ T9596] Call Trace: [ 93.173923][ T9596] ? xt_rateest_put+0x440/0x440 [ 93.178854][ T9596] xt_rateest_tg_destroy+0x72/0xa0 [ 93.183962][ T9596] ? xt_percpu_counter_free+0x8f/0xd0 [ 93.189416][ T9596] translate_table+0x11f4/0x1d80 [ 93.194346][ T9596] ? arpt_alloc_initial_table+0x690/0x690 [ 93.200091][ T9596] ? lock_downgrade+0x920/0x920 [ 93.205157][ T9596] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 93.211401][ T9596] ? _copy_from_user+0x12c/0x1a0 [ 93.216330][ T9596] do_arpt_set_ctl+0x317/0x650 [ 93.221110][ T9596] ? __do_replace+0xa80/0xa80 [ 93.225777][ T9596] ? __mutex_unlock_slowpath+0xf0/0x6a0 [ 93.231397][ T9596] ? ___might_sleep+0x163/0x2c0 [ 93.236276][ T9596] ? wait_for_completion+0x440/0x440 [ 93.241642][ T9596] ? mutex_unlock+0xd/0x10 [ 93.246253][ T9596] ? nf_sockopt_find.constprop.0+0x226/0x290 [ 93.252300][ T9596] nf_setsockopt+0x77/0xd0 [ 93.256808][ T9596] ip_setsockopt+0xdf/0x100 [ 93.261305][ T9596] udp_setsockopt+0x68/0xb0 [ 93.265812][ T9596] sock_common_setsockopt+0x94/0xd0 [ 93.271203][ T9596] __sys_setsockopt+0x261/0x4c0 [ 93.276154][ T9596] ? sock_create_kern+0x50/0x50 [ 93.281262][ T9596] ? down_read_non_owner+0x490/0x490 [ 93.286762][ T9596] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 93.293321][ T9596] ? handle_mm_fault+0x4ab/0xa50 [ 93.298257][ T9596] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 93.303714][ T9596] ? do_syscall_64+0x26/0x790 [ 93.308423][ T9596] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.314567][ T9596] ? do_syscall_64+0x26/0x790 [ 93.319242][ T9596] __x64_sys_setsockopt+0xbe/0x150 [ 93.324345][ T9596] do_syscall_64+0xfa/0x790 [ 93.328876][ T9596] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.334757][ T9596] RIP: 0033:0x441699 [ 93.338644][ T9596] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 93.358322][ T9596] RSP: 002b:00007ffe615b3f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 93.366846][ T9596] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000441699 [ 93.374834][ T9596] RDX: 0000000000000060 RSI: 0a02000000000000 RDI: 0000000000000003 [ 93.382954][ T9596] RBP: 00000000006cb018 R08: 0000000000000430 R09: 00000000004002c8 [ 93.391053][ T9596] R10: 00000000200008c0 R11: 0000000000000246 R12: 0000000000402f20 [ 93.399106][ T9596] R13: 0000000000402fb0 R14: 0000000000000000 R15: 0000000000000000 [ 93.407073][ T9596] Modules linked in: [ 93.411171][ T9596] ---[ end trace 1994e12cee58b74e ]--- [ 93.416662][ T9596] RIP: 0010:xt_rateest_put+0xa1/0x440 [ 93.422018][ T9596] Code: 65 b8 fd fa 45 84 f6 0f 84 68 02 00 00 e8 17 b7 fd fa 49 8d bd a8 13 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 6c 03 00 00 4d 8b b5 a8 13 00 00 e8 09 f0 e9 fa [ 93.441657][ T9596] RSP: 0018:ffffc90001a67940 EFLAGS: 00010202 [ 93.447746][ T9596] RAX: dffffc0000000000 RBX: ffff8880a7cfc900 RCX: ffffffff86777d02 [ 93.455789][ T9596] RDX: 0000000000000275 RSI: ffffffff86777a89 RDI: 00000000000013a8 [ 93.463768][ T9596] RBP: ffffc90001a67970 R08: ffff88809dd36000 R09: ffffed1015d2703d [ 93.471775][ T9596] R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: 000000000000002d [ 93.479773][ T9596] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff86777e40 [ 93.487777][ T9596] FS: 0000000001d2b880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 93.496771][ T9596] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 93.503347][ T9596] CR2: 00000000200008e0 CR3: 000000009efe9000 CR4: 00000000001406e0 [ 93.511362][ T9596] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 93.519361][ T9596] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 93.527474][ T9596] Kernel panic - not syncing: Fatal exception [ 93.535494][ T9596] Kernel Offset: disabled [ 93.539846][ T9596] Rebooting in 86400 seconds..