[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.554995][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 60.555004][ T26] audit: type=1800 audit(1565286313.903:29): pid=9579 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 60.592205][ T26] audit: type=1800 audit(1565286313.903:30): pid=9579 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.245' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 100.312021][ T9730] ------------[ cut here ]------------ [ 100.317506][ T9730] verifier backtracking bug [ 100.317594][ T9730] WARNING: CPU: 0 PID: 9730 at kernel/bpf/verifier.c:1782 __mark_chain_precision+0x197a/0x1ea0 [ 100.332493][ T9730] Kernel panic - not syncing: panic_on_warn set ... [ 100.339462][ T9730] CPU: 0 PID: 9730 Comm: syz-executor763 Not tainted 5.3.0-rc3+ #102 [ 100.347506][ T9730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 100.357681][ T9730] Call Trace: [ 100.360970][ T9730] dump_stack+0x172/0x1f0 [ 100.365401][ T9730] ? __mark_chain_precision+0x18c0/0x1ea0 [ 100.371184][ T9730] panic+0x2dc/0x755 [ 100.375092][ T9730] ? add_taint.cold+0x16/0x16 [ 100.379770][ T9730] ? __kasan_check_write+0x14/0x20 [ 100.384882][ T9730] ? __warn.cold+0x5/0x4c [ 100.389216][ T9730] ? __warn+0xe7/0x1e0 [ 100.393269][ T9730] ? __mark_chain_precision+0x197a/0x1ea0 [ 100.398973][ T9730] __warn.cold+0x20/0x4c [ 100.403198][ T9730] ? __mark_chain_precision+0x197a/0x1ea0 [ 100.409045][ T9730] report_bug+0x263/0x2b0 [ 100.413512][ T9730] do_error_trap+0x11b/0x200 [ 100.419685][ T9730] do_invalid_op+0x37/0x50 [ 100.424201][ T9730] ? __mark_chain_precision+0x197a/0x1ea0 [ 100.430046][ T9730] invalid_op+0x23/0x30 [ 100.434195][ T9730] RIP: 0010:__mark_chain_precision+0x197a/0x1ea0 [ 100.441412][ T9730] Code: 08 31 ff 89 de e8 26 a0 f2 ff 84 db 0f 85 07 ff ff ff e8 d9 9e f2 ff 48 c7 c7 80 a7 91 87 c6 05 2c b2 21 08 01 e8 9e 11 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 e8 fe ff ff 48 8b bd d8 fe ff ff e8 fd [ 100.461327][ T9730] RSP: 0018:ffff888090e175d8 EFLAGS: 00010286 [ 100.467510][ T9730] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 100.475557][ T9730] RDX: 0000000000000000 RSI: ffffffff815c3ba6 RDI: ffffed10121c2ead [ 100.483628][ T9730] RBP: ffff888090e17728 R08: ffff888095bbc500 R09: fffffbfff11b42c5 [ 100.491699][ T9730] R10: fffffbfff11b42c4 R11: ffffffff88da1623 R12: 0000000000000001 [ 100.500063][ T9730] R13: ffff88809bd38cc0 R14: ffff8880992c56c0 R15: ffff888090e176c0 [ 100.508286][ T9730] ? vprintk_func+0x86/0x189 [ 100.512877][ T9730] ? __mark_chain_precision+0x197a/0x1ea0 [ 100.518711][ T9730] ? print_verifier_state+0x11b0/0x11b0 [ 100.524808][ T9730] ? bpf_verifier_log_write+0x240/0x240 [ 100.530686][ T9730] ? krealloc+0xa6/0xd0 [ 100.534855][ T9730] ? push_jmp_history.isra.0+0x1a9/0x260 [ 100.540579][ T9730] do_check+0x36d6/0x89f0 [ 100.544915][ T9730] ? check_helper_call+0x3210/0x3210 [ 100.550877][ T9730] ? quarantine_put+0x11c/0x1c0 [ 100.555915][ T9730] ? trace_hardirqs_on+0x67/0x240 [ 100.560943][ T9730] ? kvfree+0x61/0x70 [ 100.565048][ T9730] bpf_check+0x6f99/0x9948 [ 100.569453][ T9730] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 100.575537][ T9730] ? do_check+0x89f0/0x89f0 [ 100.580155][ T9730] ? lock_downgrade+0x920/0x920 [ 100.585009][ T9730] ? lock_acquire+0x190/0x410 [ 100.589751][ T9730] ? bpf_prog_load+0xdce/0x1670 [ 100.594724][ T9730] ? trace_hardirqs_on+0x67/0x240 [ 100.600044][ T9730] ? memset+0x32/0x40 [ 100.604032][ T9730] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 100.610456][ T9730] ? bpf_obj_name_cpy+0x13f/0x190 [ 100.615577][ T9730] bpf_prog_load+0xe68/0x1670 [ 100.620261][ T9730] ? bpf_prog_new_fd+0x60/0x60 [ 100.625180][ T9730] ? trace_hardirqs_on+0x67/0x240 [ 100.630198][ T9730] ? lock_downgrade+0x920/0x920 [ 100.635216][ T9730] ? __might_fault+0xfb/0x1e0 [ 100.639892][ T9730] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 100.646309][ T9730] ? security_bpf+0x8b/0xc0 [ 100.651065][ T9730] __do_sys_bpf+0xc43/0x3460 [ 100.655938][ T9730] ? __kasan_check_read+0x11/0x20 [ 100.660969][ T9730] ? bpf_prog_load+0x1670/0x1670 [ 100.666031][ T9730] ? lock_downgrade+0x920/0x920 [ 100.670878][ T9730] ? __kasan_check_write+0x14/0x20 [ 100.676354][ T9730] ? up_read+0x159/0x570 [ 100.680605][ T9730] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 100.687059][ T9730] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 100.693132][ T9730] __x64_sys_bpf+0x73/0xb0 [ 100.698253][ T9730] do_syscall_64+0xfd/0x6a0 [ 100.702875][ T9730] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 100.708775][ T9730] RIP: 0033:0x4402b9 [ 100.712714][ T9730] 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 [ 100.732476][ T9730] RSP: 002b:00007fff58fbdca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 100.740883][ T9730] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 100.749314][ T9730] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 100.757396][ T9730] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 100.765374][ T9730] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401b40 [ 100.773357][ T9730] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 100.783067][ T9730] Kernel Offset: disabled [ 100.787606][ T9730] Rebooting in 86400 seconds..