[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.805862][ T26] audit: type=1800 audit(1562255921.519:25): pid=8767 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.844405][ T26] audit: type=1800 audit(1562255921.519:26): pid=8767 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.894101][ T26] audit: type=1800 audit(1562255921.529:27): pid=8767 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 '10.128.0.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.544294][ T8922] ------------[ cut here ]------------ [ 72.551422][ T8922] verifier backtracking bug [ 72.551508][ T8922] WARNING: CPU: 0 PID: 8922 at kernel/bpf/verifier.c:1755 mark_chain_precision+0x15c2/0x18e0 [ 72.568427][ T8922] Kernel panic - not syncing: panic_on_warn set ... [ 72.576083][ T8922] CPU: 0 PID: 8922 Comm: syz-executor086 Not tainted 5.2.0-rc6+ #56 [ 72.585251][ T8922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.596367][ T8922] Call Trace: [ 72.599898][ T8922] dump_stack+0x172/0x1f0 [ 72.604901][ T8922] ? mark_chain_precision+0x15b0/0x18e0 [ 72.611042][ T8922] panic+0x2cb/0x744 [ 72.615613][ T8922] ? __warn_printk+0xf3/0xf3 [ 72.620966][ T8922] ? mark_chain_precision+0x15c2/0x18e0 [ 72.627208][ T8922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.634457][ T8922] ? __warn.cold+0x5/0x4d [ 72.639004][ T8922] ? __warn+0xe8/0x1d0 [ 72.643630][ T8922] ? mark_chain_precision+0x15c2/0x18e0 [ 72.649643][ T8922] __warn.cold+0x20/0x4d [ 72.654621][ T8922] ? mark_chain_precision+0x15c2/0x18e0 [ 72.660729][ T8922] report_bug+0x263/0x2b0 [ 72.665682][ T8922] do_error_trap+0x11b/0x200 [ 72.670440][ T8922] do_invalid_op+0x37/0x50 [ 72.674936][ T8922] ? mark_chain_precision+0x15c2/0x18e0 [ 72.681291][ T8922] invalid_op+0x14/0x20 [ 72.686331][ T8922] RIP: 0010:mark_chain_precision+0x15c2/0x18e0 [ 72.693156][ T8922] 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 [ 72.714005][ T8922] RSP: 0018:ffff888085aa7378 EFLAGS: 00010282 [ 72.720397][ T8922] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 72.729064][ T8922] RDX: 0000000000000000 RSI: ffffffff815adb06 RDI: ffffed1010b54e61 [ 72.737383][ T8922] RBP: ffff888085aa74d0 R08: ffff8880a15744c0 R09: 0000000000000000 [ 72.746017][ T8922] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 72.754674][ T8922] R13: ffff8880a3e46e40 R14: 0000000000000001 R15: dffffc0000000000 [ 72.763544][ T8922] ? vprintk_func+0x86/0x189 [ 72.768988][ T8922] ? mark_chain_precision+0x15c2/0x18e0 [ 72.775949][ T8922] ? mark_reg_unknown+0x80/0x80 [ 72.781454][ T8922] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 72.788653][ T8922] ? bpf_verifier_log_write+0x240/0x240 [ 72.794763][ T8922] ? check_reg_arg+0x1f1/0x480 [ 72.800186][ T8922] check_cond_jmp_op+0xcce/0x3c20 [ 72.805887][ T8922] ? security_capable+0x95/0xc0 [ 72.811220][ T8922] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 72.817278][ T8922] ? check_func_arg+0x11b0/0x11b0 [ 72.822727][ T8922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.829717][ T8922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.836887][ T8922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.843475][ T8922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.850329][ T8922] ? krealloc+0x7b/0xd0 [ 72.855652][ T8922] ? krealloc+0x7b/0xd0 [ 72.860549][ T8922] ? rcu_read_lock_sched_held+0x110/0x130 [ 72.866713][ T8922] ? kfree+0x1f7/0x220 [ 72.871407][ T8922] do_check+0x61cf/0x8930 [ 72.876184][ T8922] ? debug_check_no_obj_freed+0x200/0x464 [ 72.883102][ T8922] ? check_helper_call+0x3200/0x3200 [ 72.888660][ T8922] ? kfree+0x170/0x220 [ 72.893020][ T8922] ? kvfree+0x61/0x70 [ 72.897049][ T8922] ? kfree+0x170/0x220 [ 72.901717][ T8922] ? lockdep_hardirqs_on+0x418/0x5d0 [ 72.907506][ T8922] ? trace_hardirqs_on+0x67/0x220 [ 72.913863][ T8922] ? kvfree+0x61/0x70 [ 72.918559][ T8922] bpf_check+0x6f99/0x9950 [ 72.923394][ T8922] ? do_check+0x8930/0x8930 [ 72.928457][ T8922] ? ktime_get_with_offset+0x13a/0x360 [ 72.934643][ T8922] ? bpf_prog_load+0xe2e/0x1670 [ 72.940025][ T8922] ? ktime_get_with_offset+0x13a/0x360 [ 72.946464][ T8922] ? lockdep_hardirqs_on+0x418/0x5d0 [ 72.952170][ T8922] ? trace_hardirqs_on+0x67/0x220 [ 72.957573][ T8922] ? memset+0x32/0x40 [ 72.961793][ T8922] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 72.968352][ T8922] ? bpf_obj_name_cpy+0x13f/0x190 [ 72.974462][ T8922] bpf_prog_load+0xec8/0x1670 [ 72.979410][ T8922] ? bpf_prog_new_fd+0x60/0x60 [ 72.984352][ T8922] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 72.990861][ T8922] ? security_bpf+0x8b/0xc0 [ 72.995554][ T8922] __do_sys_bpf+0xa20/0x42c0 [ 73.000205][ T8922] ? bpf_prog_load+0x1670/0x1670 [ 73.005358][ T8922] ? __do_page_fault+0x623/0xda0 [ 73.010800][ T8922] ? find_held_lock+0x35/0x130 [ 73.015936][ T8922] ? __do_page_fault+0x623/0xda0 [ 73.021604][ T8922] ? lock_downgrade+0x880/0x880 [ 73.026933][ T8922] ? kasan_check_read+0x11/0x20 [ 73.031993][ T8922] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 73.039569][ T8922] ? do_syscall_64+0x26/0x680 [ 73.044721][ T8922] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.051614][ T8922] ? do_syscall_64+0x26/0x680 [ 73.057125][ T8922] __x64_sys_bpf+0x73/0xb0 [ 73.062446][ T8922] do_syscall_64+0xfd/0x680 [ 73.067304][ T8922] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.073822][ T8922] RIP: 0033:0x440369 [ 73.078384][ T8922] 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 [ 73.100613][ T8922] RSP: 002b:00007ffc80aba618 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 73.109701][ T8922] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 73.117795][ T8922] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 73.127126][ T8922] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 73.135630][ T8922] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 73.144176][ T8922] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 73.154715][ T8922] Kernel Offset: disabled [ 73.159121][ T8922] Rebooting in 86400 seconds..