[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.095248][ T26] audit: type=1800 audit(1562253709.057:25): pid=8692 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.117662][ T26] audit: type=1800 audit(1562253709.067:26): pid=8692 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.138988][ T26] audit: type=1800 audit(1562253709.067:27): pid=8692 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 '10.128.0.162' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 102.360320][ T8846] ------------[ cut here ]------------ [ 102.365842][ T8846] verifier backtracking bug [ 102.365929][ T8846] WARNING: CPU: 0 PID: 8846 at kernel/bpf/verifier.c:1755 mark_chain_precision+0x15c2/0x18e0 [ 102.380641][ T8846] Kernel panic - not syncing: panic_on_warn set ... [ 102.387735][ T8846] CPU: 0 PID: 8846 Comm: syz-executor835 Not tainted 5.2.0-rc6+ #56 [ 102.396131][ T8846] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 102.407561][ T8846] Call Trace: [ 102.411102][ T8846] dump_stack+0x172/0x1f0 [ 102.415425][ T8846] ? mark_chain_precision+0x15b0/0x18e0 [ 102.420961][ T8846] panic+0x2cb/0x744 [ 102.424847][ T8846] ? __warn_printk+0xf3/0xf3 [ 102.430474][ T8846] ? mark_chain_precision+0x15c2/0x18e0 [ 102.436008][ T8846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 102.442366][ T8846] ? __warn.cold+0x5/0x4d [ 102.446912][ T8846] ? __warn+0xe8/0x1d0 [ 102.451201][ T8846] ? mark_chain_precision+0x15c2/0x18e0 [ 102.456788][ T8846] __warn.cold+0x20/0x4d [ 102.461209][ T8846] ? mark_chain_precision+0x15c2/0x18e0 [ 102.466749][ T8846] report_bug+0x263/0x2b0 [ 102.471352][ T8846] do_error_trap+0x11b/0x200 [ 102.476082][ T8846] do_invalid_op+0x37/0x50 [ 102.480690][ T8846] ? mark_chain_precision+0x15c2/0x18e0 [ 102.486228][ T8846] invalid_op+0x14/0x20 [ 102.490376][ T8846] RIP: 0010:mark_chain_precision+0x15c2/0x18e0 [ 102.496695][ T8846] Code: e9 55 f2 ff ff 48 89 df e8 4b 0a 2c 00 e9 3a f3 ff ff e8 61 cb f2 ff 48 c7 c7 e0 43 91 87 c6 05 40 2b 1f 08 01 e8 1c 03 c5 ff <0f> 0b 41 be f2 ff ff ff e9 eb f7 ff ff e8 3c cb f2 ff 45 31 f6 e9 [ 102.517092][ T8846] RSP: 0018:ffff8880a01ef378 EFLAGS: 00010282 [ 102.523322][ T8846] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 102.531501][ T8846] RDX: 0000000000000000 RSI: ffffffff815adb06 RDI: ffffed101403de61 [ 102.539721][ T8846] RBP: ffff8880a01ef4d0 R08: ffff88808e26c400 R09: 0000000000000000 [ 102.547858][ T8846] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 102.556020][ T8846] R13: ffff8880a14e8440 R14: 0000000000000001 R15: dffffc0000000000 [ 102.564165][ T8846] ? vprintk_func+0x86/0x189 [ 102.568789][ T8846] ? mark_chain_precision+0x15c2/0x18e0 [ 102.574331][ T8846] ? mark_reg_unknown+0x80/0x80 [ 102.579221][ T8846] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 102.587255][ T8846] ? bpf_verifier_log_write+0x240/0x240 [ 102.592903][ T8846] ? check_reg_arg+0x1f1/0x480 [ 102.597979][ T8846] check_cond_jmp_op+0xcce/0x3c20 [ 102.603114][ T8846] ? security_capable+0x95/0xc0 [ 102.608998][ T8846] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 102.614689][ T8846] ? check_func_arg+0x11b0/0x11b0 [ 102.620563][ T8846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 102.627343][ T8846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 102.633863][ T8846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 102.641225][ T8846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 102.648478][ T8846] ? krealloc+0x7b/0xd0 [ 102.653414][ T8846] ? krealloc+0x7b/0xd0 [ 102.657865][ T8846] ? rcu_read_lock_sched_held+0x110/0x130 [ 102.663712][ T8846] ? kfree+0x1f7/0x220 [ 102.668172][ T8846] do_check+0x61cf/0x8930 [ 102.674160][ T8846] ? debug_check_no_obj_freed+0x200/0x464 [ 102.679978][ T8846] ? check_helper_call+0x3200/0x3200 [ 102.686139][ T8846] ? kfree+0x170/0x220 [ 102.692233][ T8846] ? kvfree+0x61/0x70 [ 102.696410][ T8846] ? kfree+0x170/0x220 [ 102.700830][ T8846] ? lockdep_hardirqs_on+0x418/0x5d0 [ 102.706115][ T8846] ? trace_hardirqs_on+0x67/0x220 [ 102.711370][ T8846] ? kvfree+0x61/0x70 [ 102.715960][ T8846] bpf_check+0x6f99/0x9950 [ 102.720385][ T8846] ? do_check+0x8930/0x8930 [ 102.724889][ T8846] ? ktime_get_with_offset+0x13a/0x360 [ 102.730518][ T8846] ? bpf_prog_load+0xe2e/0x1670 [ 102.736960][ T8846] ? ktime_get_with_offset+0x13a/0x360 [ 102.743177][ T8846] ? lockdep_hardirqs_on+0x418/0x5d0 [ 102.748554][ T8846] ? trace_hardirqs_on+0x67/0x220 [ 102.753820][ T8846] ? memset+0x32/0x40 [ 102.757889][ T8846] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 102.764480][ T8846] ? bpf_obj_name_cpy+0x13f/0x190 [ 102.770170][ T8846] bpf_prog_load+0xec8/0x1670 [ 102.775248][ T8846] ? bpf_prog_new_fd+0x60/0x60 [ 102.780210][ T8846] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 102.786950][ T8846] ? security_bpf+0x8b/0xc0 [ 102.791543][ T8846] __do_sys_bpf+0xa20/0x42c0 [ 102.796135][ T8846] ? bpf_prog_load+0x1670/0x1670 [ 102.801542][ T8846] ? __do_page_fault+0x623/0xda0 [ 102.806782][ T8846] ? find_held_lock+0x35/0x130 [ 102.811662][ T8846] ? __do_page_fault+0x623/0xda0 [ 102.817687][ T8846] ? lock_downgrade+0x880/0x880 [ 102.822658][ T8846] ? kasan_check_read+0x11/0x20 [ 102.827513][ T8846] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 102.832995][ T8846] ? do_syscall_64+0x26/0x680 [ 102.837810][ T8846] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 102.843960][ T8846] ? do_syscall_64+0x26/0x680 [ 102.849325][ T8846] __x64_sys_bpf+0x73/0xb0 [ 102.853830][ T8846] do_syscall_64+0xfd/0x680 [ 102.859121][ T8846] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 102.865041][ T8846] RIP: 0033:0x440369 [ 102.869046][ T8846] 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 [ 102.889886][ T8846] RSP: 002b:00007ffccb952af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 102.898500][ T8846] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 102.906567][ T8846] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 102.914641][ T8846] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 102.922948][ T8846] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 102.931081][ T8846] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 102.940435][ T8846] Kernel Offset: disabled [ 102.944939][ T8846] Rebooting in 86400 seconds..