[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 79.554910][ T27] audit: type=1800 audit(1581742389.124:25): pid=9458 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 79.574723][ T27] audit: type=1800 audit(1581742389.124:26): pid=9458 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 79.620987][ T27] audit: type=1800 audit(1581742389.124:27): pid=9458 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 '10.128.1.45' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 467.907876][ T9618] xt_hashlimit: size too large, truncated to 1048576 [ 467.918514][ T9625] xt_hashlimit: size too large, truncated to 1048576 [ 467.930656][ T9627] xt_hashlimit: size too large, truncated to 1048576 [ 467.939996][ T9626] xt_hashlimit: size too large, truncated to 1048576 [ 467.952491][ T9638] xt_hashlimit: size too large, truncated to 1048576 [ 467.959850][ T9637] xt_hashlimit: size too large, truncated to 1048576 [ 467.973965][ T9625] Cannot find add_set index 0 as target [ 467.979623][ T9627] Cannot find add_set index 0 as target [ 467.985436][ T9626] Cannot find add_set index 0 as target [ 467.991895][ T9638] Cannot find add_set index 0 as target [ 467.991899][ T9637] Cannot find add_set index 0 as target [ 467.995154][ T9639] xt_hashlimit: size too large, truncated to 1048576 [ 468.005774][ T9618] Cannot find add_set index 0 as target [ 468.024137][ T9639] Cannot find add_set index 0 as target [ 468.034672][ T9628] xt_hashlimit: size too large, truncated to 1048576 [ 468.043294][ T9628] Cannot find add_set index 0 as target [ 468.049534][ T9626] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program executing program executing program [ 468.055867][ T9629] xt_hashlimit: size too large, truncated to 1048576 [ 468.061348][ T9626] Cannot find add_set index 0 as target [ 468.066381][ T9629] Cannot find add_set index 0 as target [ 468.161157][ T9660] ------------[ cut here ]------------ [ 468.166882][ T9660] proc_dir_entry 'ipt_hashlimit/vlan0' already registered [ 468.174564][ T9660] WARNING: CPU: 0 PID: 9660 at fs/proc/generic.c:362 proc_register+0x41e/0x590 [ 468.183497][ T9660] Kernel panic - not syncing: panic_on_warn set ... [ 468.190080][ T9660] CPU: 0 PID: 9660 Comm: syz-executor240 Not tainted 5.6.0-rc1-next-20200214-syzkaller #0 [ 468.199976][ T9660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 468.210026][ T9660] Call Trace: [ 468.213439][ T9660] dump_stack+0x197/0x210 [ 468.217781][ T9660] ? proc_register+0x320/0x590 [ 468.222587][ T9660] panic+0x2e3/0x75c [ 468.226486][ T9660] ? add_taint.cold+0x16/0x16 [ 468.231224][ T9660] ? __kasan_check_write+0x14/0x20 [ 468.236336][ T9660] ? __warn.cold+0x14/0x3e [ 468.240756][ T9660] ? __warn+0xd9/0x1cf [ 468.244830][ T9660] ? proc_register+0x41e/0x590 [ 468.249606][ T9660] __warn.cold+0x2f/0x3e [ 468.253851][ T9660] ? proc_register+0x41e/0x590 [ 468.258649][ T9660] report_bug+0x289/0x300 [ 468.263180][ T9660] do_error_trap+0x11b/0x200 [ 468.267790][ T9660] do_invalid_op+0x37/0x50 [ 468.272215][ T9660] ? proc_register+0x41e/0x590 [ 468.277763][ T9660] invalid_op+0x23/0x30 [ 468.281925][ T9660] RIP: 0010:proc_register+0x41e/0x590 [ 468.287295][ T9660] Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 5a 01 00 00 48 8b 45 d0 48 c7 c7 e0 31 59 88 48 8b b0 d0 00 00 00 e8 31 14 5e ff <0f> 0b 48 c7 c7 a0 60 cb 89 e8 b4 2b 09 06 48 8b 4d a0 48 b8 00 00 [ 468.306901][ T9660] RSP: 0018:ffffc90002187550 EFLAGS: 00010286 [ 468.312964][ T9660] RAX: 0000000000000000 RBX: ffff8882150fcb30 RCX: 0000000000000000 [ 468.320953][ T9660] RDX: 0000000000000000 RSI: ffffffff815efb96 RDI: fffff52000430e9c [ 468.328937][ T9660] RBP: ffffc900021875b8 R08: ffff888097714180 R09: fffffbfff16a3f8a [ 468.336905][ T9660] R10: fffffbfff16a3f89 R11: ffffffff8b51fc4f R12: ffff8880a72ede80 [ 468.344873][ T9660] R13: 0000000000000000 R14: ffff8880a3e2f8b8 R15: dffffc0000000000 [ 468.352966][ T9660] ? vprintk_func+0x86/0x189 [ 468.357602][ T9660] proc_create_seq_private+0x12b/0x190 [ 468.363067][ T9660] ? proc_create+0x40/0x40 [ 468.367482][ T9660] ? lockdep_init_map+0x1be/0x6d0 [ 468.372604][ T9660] hashlimit_mt_check_common.isra.0+0xb30/0x1680 [ 468.378952][ T9660] hashlimit_mt_check_v2+0x327/0x3b0 [ 468.384239][ T9660] ? hashlimit_mt_check+0xd0/0xd0 [ 468.389258][ T9660] ? lock_downgrade+0x920/0x920 [ 468.394219][ T9660] ? xt_find_match+0xa6/0x280 [ 468.398904][ T9660] ? mutex_trylock+0x2d0/0x2d0 [ 468.403740][ T9660] ? nf_logger_find_get+0x1a4/0x3a0 [ 468.409035][ T9660] ? hashlimit_mt_check+0xd0/0xd0 [ 468.414068][ T9660] xt_check_match+0x280/0x690 [ 468.418752][ T9660] ? xt_check_target+0x690/0x690 [ 468.423705][ T9660] ? mutex_unlock+0xd/0x10 [ 468.428136][ T9660] ? mutex_unlock+0xd/0x10 [ 468.432561][ T9660] ? xt_find_match+0x73/0x280 [ 468.437360][ T9660] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 468.443671][ T9660] find_check_entry.isra.0+0x32f/0x920 [ 468.449158][ T9660] ? ipt_do_table+0x1b80/0x1b80 [ 468.454024][ T9660] ? lockdep_hardirqs_on+0x421/0x5e0 [ 468.459371][ T9660] ? kvfree+0x4a/0x60 [ 468.463372][ T9660] translate_table+0xcb4/0x17d0 [ 468.468260][ T9660] ? compat_do_ipt_get_ctl+0x910/0x910 [ 468.473726][ T9660] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 468.480030][ T9660] ? _copy_from_user+0x12c/0x1a0 [ 468.484983][ T9660] do_ipt_set_ctl+0x2fe/0x4c2 [ 468.489670][ T9660] ? compat_do_ipt_set_ctl+0x170/0x170 [ 468.495150][ T9660] ? mutex_unlock+0xd/0x10 [ 468.499570][ T9660] ? nf_sockopt_find.constprop.0+0x226/0x290 [ 468.505557][ T9660] nf_setsockopt+0x77/0xd0 [ 468.510006][ T9660] ip_setsockopt+0xdf/0x100 [ 468.514515][ T9660] tcp_setsockopt+0x8f/0xe0 [ 468.519091][ T9660] sock_common_setsockopt+0x94/0xd0 [ 468.524347][ T9660] __sys_setsockopt+0x261/0x4c0 [ 468.529207][ T9660] ? sock_create_kern+0x50/0x50 [ 468.534103][ T9660] ? up_read+0x1cd/0x810 [ 468.538379][ T9660] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 468.543839][ T9660] ? do_syscall_64+0x26/0x790 [ 468.548516][ T9660] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 468.554586][ T9660] ? do_syscall_64+0x26/0x790 [ 468.559278][ T9660] __x64_sys_setsockopt+0xbe/0x150 [ 468.564395][ T9660] do_syscall_64+0xfa/0x790 [ 468.568906][ T9660] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 468.574791][ T9660] RIP: 0033:0x44a7d9 [ 468.578682][ T9660] 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 7b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 468.598288][ T9660] RSP: 002b:00007fce3bdc0ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 468.606709][ T9660] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a7d9 [ 468.614685][ T9660] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 468.622659][ T9660] RBP: 00000000006dbc20 R08: 00000000000003a8 R09: 0000000000000000 [ 468.630635][ T9660] R10: 0000000020000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 468.638612][ T9660] R13: 00007ffd7600e7cf R14: 00007fce3bdc19c0 R15: 0000000000000000 [ 468.648054][ T9660] Kernel Offset: disabled [ 468.652442][ T9660] Rebooting in 86400 seconds..