[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 87.544467][ T28] audit: type=1800 audit(1581804921.938:25): pid=9523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 87.566857][ T28] audit: type=1800 audit(1581804921.948:26): pid=9523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 87.615176][ T28] audit: type=1800 audit(1581804921.948:27): pid=9523 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 '10.128.10.6' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 637.257712][ T9686] xt_hashlimit: size too large, truncated to 1048576 [ 637.264244][ T9692] xt_hashlimit: size too large, truncated to 1048576 [ 637.269989][ T9696] xt_hashlimit: size too large, truncated to 1048576 [ 637.275489][ T9693] xt_hashlimit: size too large, truncated to 1048576 [ 637.287845][ T9694] xt_hashlimit: size too large, truncated to 1048576 [ 637.295565][ T9695] xt_hashlimit: size too large, truncated to 1048576 [ 637.313590][ T9693] xt_hashlimit: size too large, truncated to 1048576 [ 637.315377][ T9696] xt_hashlimit: size too large, truncated to 1048576 executing program executing program [ 637.369250][ T9695] xt_hashlimit: size too large, truncated to 1048576 [ 637.376543][ T9694] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 642.353166][ T9745] hashlimit_mt_check_common: 25 callbacks suppressed [ 642.353173][ T9745] xt_hashlimit: size too large, truncated to 1048576 executing program [ 647.856543][ T9747] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program [ 648.022384][ T9749] xt_hashlimit: size too large, truncated to 1048576 [ 648.038446][ T9751] xt_hashlimit: size too large, truncated to 1048576 [ 648.053777][ T9753] xt_hashlimit: size too large, truncated to 1048576 [ 648.081862][ T9755] xt_hashlimit: size too large, truncated to 1048576 [ 648.149098][ T9751] xt_hashlimit: size too large, truncated to 1048576 [ 648.153692][ T9753] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program [ 648.257309][ T9759] xt_hashlimit: size too large, truncated to 1048576 [ 648.284026][ T9762] xt_hashlimit: size too large, truncated to 1048576 [ 648.286081][ T9763] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program [ 653.237693][ T9780] hashlimit_mt_check_common: 8 callbacks suppressed [ 653.237701][ T9780] xt_hashlimit: size too large, truncated to 1048576 executing program [ 653.344718][ T9782] xt_hashlimit: size too large, truncated to 1048576 [ 653.407080][ T9784] xt_hashlimit: size too large, truncated to 1048576 [ 653.513094][ T9786] xt_hashlimit: size too large, truncated to 1048576 executing program [ 653.682002][ T9788] xt_hashlimit: size too large, truncated to 1048576 [ 653.846925][ T9790] xt_hashlimit: size too large, truncated to 1048576 executing program executing program [ 654.058769][ T9792] xt_hashlimit: size too large, truncated to 1048576 executing program [ 654.100016][ T9794] xt_hashlimit: size too large, truncated to 1048576 [ 654.150277][ T9796] xt_hashlimit: size too large, truncated to 1048576 [ 654.232046][ T9792] xt_hashlimit: size too large, truncated to 1048576 executing program executing program [ 659.216372][ T9807] hashlimit_mt_check_common: 4 callbacks suppressed [ 659.216380][ T9807] xt_hashlimit: size too large, truncated to 1048576 executing program [ 659.335254][ T9809] xt_hashlimit: size too large, truncated to 1048576 [ 659.386228][ T9811] xt_hashlimit: size too large, truncated to 1048576 [ 659.416969][ T9809] xt_hashlimit: size too large, truncated to 1048576 executing program [ 659.568270][ T9814] xt_hashlimit: size too large, truncated to 1048576 [ 659.730826][ T9816] xt_hashlimit: size too large, truncated to 1048576 executing program executing program [ 659.827681][ T9818] xt_hashlimit: size too large, truncated to 1048576 [ 659.882183][ T9818] xt_hashlimit: size too large, truncated to 1048576 [ 659.891314][ T9821] xt_hashlimit: size too large, truncated to 1048576 executing program [ 660.054245][ T9823] xt_hashlimit: size too large, truncated to 1048576 executing program executing program executing program executing program [ 666.433497][ T9839] hashlimit_mt_check_common: 8 callbacks suppressed [ 666.433505][ T9839] xt_hashlimit: size too large, truncated to 1048576 [ 666.597769][ T9841] xt_hashlimit: size too large, truncated to 1048576 executing program [ 666.815369][ T9843] xt_hashlimit: size too large, truncated to 1048576 [ 666.976926][ T9845] xt_hashlimit: size too large, truncated to 1048576 executing program executing program [ 667.109115][ T9849] xt_hashlimit: size too large, truncated to 1048576 [ 667.117228][ T9848] xt_hashlimit: size too large, truncated to 1048576 [ 667.138154][ T9848] xt_hashlimit: size too large, truncated to 1048576 [ 667.149079][ T9849] xt_hashlimit: size too large, truncated to 1048576 executing program [ 667.256241][ T9853] xt_hashlimit: size too large, truncated to 1048576 [ 667.277142][ T9849] ------------[ cut here ]------------ [ 667.282855][ T9849] proc_dir_entry 'ipt_hashlimit/vxcan1' already registered [ 667.290461][ T9849] WARNING: CPU: 1 PID: 9849 at fs/proc/generic.c:362 proc_register+0x41e/0x590 [ 667.299413][ T9849] Kernel panic - not syncing: panic_on_warn set ... [ 667.306006][ T9849] CPU: 1 PID: 9849 Comm: syz-executor819 Not tainted 5.6.0-rc1-next-20200214-syzkaller #0 [ 667.315888][ T9849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 667.325934][ T9849] Call Trace: [ 667.329343][ T9849] dump_stack+0x197/0x210 [ 667.333688][ T9849] ? proc_register+0x320/0x590 [ 667.338501][ T9849] panic+0x2e3/0x75c [ 667.342408][ T9849] ? add_taint.cold+0x16/0x16 [ 667.347170][ T9849] ? __kasan_check_write+0x14/0x20 [ 667.352287][ T9849] ? __warn.cold+0x14/0x3e executing program [ 667.356706][ T9849] ? __warn+0xd9/0x1cf [ 667.360784][ T9849] ? proc_register+0x41e/0x590 [ 667.365546][ T9849] __warn.cold+0x2f/0x3e [ 667.369793][ T9849] ? proc_register+0x41e/0x590 [ 667.374612][ T9849] report_bug+0x289/0x300 [ 667.379020][ T9849] do_error_trap+0x11b/0x200 [ 667.383635][ T9849] do_invalid_op+0x37/0x50 [ 667.388073][ T9849] ? proc_register+0x41e/0x590 [ 667.392926][ T9849] invalid_op+0x23/0x30 [ 667.397101][ T9849] RIP: 0010:proc_register+0x41e/0x590 [ 667.399725][ T9855] xt_hashlimit: size too large, truncated to 1048576 [ 667.402584][ T9849] 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 [ 667.402607][ T9849] RSP: 0018:ffffc90000de7550 EFLAGS: 00010286 [ 667.402617][ T9849] RAX: 0000000000000000 RBX: ffff888215062670 RCX: 0000000000000000 [ 667.402633][ T9849] RDX: 0000000000000000 RSI: ffffffff815efb96 RDI: fffff520001bce9c [ 667.450919][ T9849] RBP: ffffc90000de75b8 R08: ffff888092b6a500 R09: fffffbfff16a3f8a [ 667.458894][ T9849] R10: fffffbfff16a3f89 R11: ffffffff8b51fc4f R12: ffff8880952f8940 [ 667.466864][ T9849] R13: 0000000000000000 R14: ffff888087208c38 R15: dffffc0000000000 [ 667.474945][ T9849] ? vprintk_func+0x86/0x189 [ 667.479579][ T9849] proc_create_seq_private+0x12b/0x190 [ 667.485040][ T9849] ? proc_create+0x40/0x40 [ 667.489470][ T9849] ? lockdep_init_map+0x1be/0x6d0 [ 667.494594][ T9849] hashlimit_mt_check_common.isra.0+0xb30/0x1680 [ 667.500943][ T9849] hashlimit_mt_check_v1+0x325/0x3ab [ 667.506240][ T9849] ? hashlimit_mt_check_v2+0x3b0/0x3b0 [ 667.511700][ T9849] ? lock_downgrade+0x920/0x920 [ 667.516568][ T9849] ? xt_find_match+0xa6/0x280 [ 667.521258][ T9849] ? mutex_trylock+0x2d0/0x2d0 [ 667.526089][ T9849] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 667.532248][ T9849] ? hashlimit_mt_check_v2+0x3b0/0x3b0 [ 667.537738][ T9849] xt_check_match+0x280/0x690 [ 667.542440][ T9849] ? xt_check_target+0x690/0x690 [ 667.547529][ T9849] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 667.553837][ T9849] ? mutex_unlock+0xd/0x10 [ 667.558261][ T9849] ? xt_find_match+0x73/0x280 [ 667.562956][ T9849] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 667.569305][ T9849] find_check_entry.isra.0+0x32f/0x920 [ 667.574804][ T9849] ? ipt_do_table+0x1b80/0x1b80 [ 667.579677][ T9849] ? lockdep_hardirqs_on+0x421/0x5e0 [ 667.585019][ T9849] ? trace_hardirqs_on+0x67/0x240 [ 667.590094][ T9849] ? kvfree+0x4a/0x60 [ 667.594108][ T9849] translate_table+0xcb4/0x17d0 [ 667.598996][ T9849] ? compat_do_ipt_get_ctl+0x910/0x910 [ 667.604470][ T9849] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 667.610762][ T9849] ? _copy_from_user+0x12c/0x1a0 [ 667.615713][ T9849] do_ipt_set_ctl+0x2fe/0x4c2 [ 667.620399][ T9849] ? compat_do_ipt_set_ctl+0x170/0x170 [ 667.625923][ T9849] ? mutex_unlock+0xd/0x10 [ 667.630424][ T9849] ? nf_sockopt_find.constprop.0+0x226/0x290 [ 667.636453][ T9849] nf_setsockopt+0x77/0xd0 [ 667.640947][ T9849] ip_setsockopt+0xdf/0x100 [ 667.645483][ T9849] tcp_setsockopt+0x8f/0xe0 [ 667.650139][ T9849] sock_common_setsockopt+0x94/0xd0 [ 667.655534][ T9849] __sys_setsockopt+0x261/0x4c0 [ 667.660406][ T9849] ? sock_create_kern+0x50/0x50 [ 667.665283][ T9849] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 667.671341][ T9849] ? __x64_sys_futex+0x404/0x590 [ 667.676330][ T9849] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 667.681807][ T9849] ? do_syscall_64+0x26/0x790 [ 667.686495][ T9849] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 667.692583][ T9849] ? do_syscall_64+0x26/0x790 [ 667.697298][ T9849] __x64_sys_setsockopt+0xbe/0x150 [ 667.702444][ T9849] do_syscall_64+0xfa/0x790 [ 667.706980][ T9849] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 667.712896][ T9849] RIP: 0033:0x44a4a9 [ 667.716802][ T9849] 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 [ 667.736419][ T9849] RSP: 002b:00007f34e53a4ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 667.744956][ T9849] RAX: ffffffffffffffda RBX: 00000000006dfc28 RCX: 000000000044a4a9 [ 667.752941][ T9849] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000006 [ 667.760933][ T9849] RBP: 00000000006dfc20 R08: 0000000000000318 R09: 0000000000000000 [ 667.768923][ T9849] R10: 0000000020000540 R11: 0000000000000246 R12: 00000000006dfc2c [ 667.776900][ T9849] R13: 00007ffdd3111adf R14: 00007f34e53a59c0 R15: 0000000000000000 [ 667.786604][ T9849] Kernel Offset: disabled [ 667.791047][ T9849] Rebooting in 86400 seconds..