[ 62.552904][ T26] audit: type=1800 audit(1562253780.951:24): pid=9162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.260581][ T26] audit: type=1800 audit(1562253781.761:25): pid=9162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.301104][ T26] audit: type=1800 audit(1562253781.771:26): pid=9162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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 '10.128.10.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.644415][ T9314] ------------[ cut here ]------------ [ 73.649950][ T9314] verifier backtracking bug [ 73.650034][ T9314] WARNING: CPU: 1 PID: 9314 at kernel/bpf/verifier.c:1755 mark_chain_precision+0x15c2/0x18e0 [ 73.664665][ T9314] Kernel panic - not syncing: panic_on_warn set ... [ 73.671260][ T9314] CPU: 1 PID: 9314 Comm: syz-executor088 Not tainted 5.2.0-rc7-next-20190703 #28 [ 73.680349][ T9314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.690415][ T9314] Call Trace: [ 73.693713][ T9314] dump_stack+0x172/0x1f0 [ 73.698030][ T9314] ? mark_chain_precision+0x1520/0x18e0 [ 73.703564][ T9314] panic+0x2dc/0x755 [ 73.707440][ T9314] ? add_taint.cold+0x16/0x16 [ 73.712101][ T9314] ? kasan_check_write+0x14/0x20 [ 73.717019][ T9314] ? __warn.cold+0x5/0x4c [ 73.721351][ T9314] ? __warn+0xe7/0x1e0 [ 73.725405][ T9314] ? mark_chain_precision+0x15c2/0x18e0 [ 73.730937][ T9314] __warn.cold+0x20/0x4c [ 73.735175][ T9314] ? mark_chain_precision+0x15c2/0x18e0 [ 73.740714][ T9314] report_bug+0x263/0x2b0 [ 73.745031][ T9314] do_error_trap+0x11b/0x200 [ 73.749626][ T9314] do_invalid_op+0x37/0x50 [ 73.754027][ T9314] ? mark_chain_precision+0x15c2/0x18e0 [ 73.759554][ T9314] invalid_op+0x14/0x20 [ 73.763697][ T9314] RIP: 0010:mark_chain_precision+0x15c2/0x18e0 [ 73.769851][ T9314] Code: e9 55 f2 ff ff 48 89 df e8 5b c9 2c 00 e9 3a f3 ff ff e8 21 a7 f2 ff 48 c7 c7 60 9d 91 87 c6 05 1e f8 1f 08 01 e8 96 1f c4 ff <0f> 0b 41 be f2 ff ff ff e9 eb f7 ff ff e8 fc a6 f2 ff 45 31 f6 e9 [ 73.789446][ T9314] RSP: 0018:ffff88809153f378 EFLAGS: 00010282 [ 73.795511][ T9314] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 73.803464][ T9314] RDX: 0000000000000000 RSI: ffffffff815c0c96 RDI: ffffed10122a7e61 [ 73.811431][ T9314] RBP: ffff88809153f4d0 R08: ffff888097d5c100 R09: 0000000000000000 [ 73.819401][ T9314] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 73.827359][ T9314] R13: ffff88808bd780c0 R14: 0000000000000001 R15: dffffc0000000000 [ 73.835352][ T9314] ? vprintk_func+0x86/0x189 [ 73.839930][ T9314] ? mark_chain_precision+0x15c2/0x18e0 [ 73.845465][ T9314] ? mark_reg_unknown+0x50/0x50 [ 73.850319][ T9314] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 73.856113][ T9314] ? bpf_verifier_log_write+0x240/0x240 [ 73.861906][ T9314] ? check_reg_arg+0x1f1/0x480 [ 73.866653][ T9314] check_cond_jmp_op+0xcce/0x3c20 [ 73.871663][ T9314] ? security_capable+0x95/0xc0 [ 73.876505][ T9314] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 73.882121][ T9314] ? find_held_lock+0x35/0x130 [ 73.886875][ T9314] ? check_func_arg+0x11b0/0x11b0 [ 73.891884][ T9314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.898108][ T9314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.904336][ T9314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.910565][ T9314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.916798][ T9314] ? krealloc+0x7b/0xd0 [ 73.920954][ T9314] ? krealloc+0x7b/0xd0 [ 73.925096][ T9314] ? rcu_read_lock_sched_held+0x110/0x130 [ 73.930799][ T9314] ? kfree+0x28b/0x2c0 [ 73.934853][ T9314] do_check+0x6187/0x8990 [ 73.939164][ T9314] ? find_held_lock+0x35/0x130 [ 73.943942][ T9314] ? check_helper_call+0x3210/0x3210 [ 73.949209][ T9314] ? kfree+0x226/0x2c0 [ 73.953285][ T9314] ? kvfree+0x61/0x70 [ 73.957245][ T9314] ? kfree+0x226/0x2c0 [ 73.961300][ T9314] ? lockdep_hardirqs_on+0x418/0x5d0 [ 73.966568][ T9314] ? trace_hardirqs_on+0x67/0x240 [ 73.971577][ T9314] ? kvfree+0x61/0x70 [ 73.975544][ T9314] bpf_check+0x6f99/0x9948 [ 73.979953][ T9314] ? do_check+0x8990/0x8990 [ 73.984442][ T9314] ? lock_downgrade+0x920/0x920 [ 73.989272][ T9314] ? ktime_get_with_offset+0x13a/0x350 [ 73.994713][ T9314] ? bpf_prog_load+0xdce/0x1670 [ 73.999541][ T9314] ? ktime_get_with_offset+0x13a/0x350 [ 74.005003][ T9314] ? lockdep_hardirqs_on+0x418/0x5d0 [ 74.010271][ T9314] ? trace_hardirqs_on+0x67/0x240 [ 74.015292][ T9314] ? memset+0x32/0x40 [ 74.019276][ T9314] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 74.025500][ T9314] ? bpf_obj_name_cpy+0x13f/0x190 [ 74.030511][ T9314] bpf_prog_load+0xe68/0x1670 [ 74.035175][ T9314] ? bpf_prog_new_fd+0x60/0x60 [ 74.039997][ T9314] ? lock_downgrade+0x920/0x920 [ 74.044842][ T9314] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 74.051065][ T9314] ? security_bpf+0x8b/0xc0 [ 74.055552][ T9314] __do_sys_bpf+0xa46/0x42f0 [ 74.060144][ T9314] ? bpf_prog_load+0x1670/0x1670 [ 74.065068][ T9314] ? lock_downgrade+0x920/0x920 [ 74.069905][ T9314] ? kasan_check_write+0x14/0x20 [ 74.074824][ T9314] ? up_read+0x159/0x570 [ 74.079064][ T9314] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 74.084510][ T9314] ? do_syscall_64+0x26/0x6a0 [ 74.089175][ T9314] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.095255][ T9314] ? do_syscall_64+0x26/0x6a0 [ 74.099921][ T9314] __x64_sys_bpf+0x73/0xb0 [ 74.104322][ T9314] do_syscall_64+0xfd/0x6a0 [ 74.108812][ T9314] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.114692][ T9314] RIP: 0033:0x440369 [ 74.118570][ T9314] 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 [ 74.138251][ T9314] RSP: 002b:00007ffd97e06b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 74.146655][ T9314] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 74.154617][ T9314] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 74.162573][ T9314] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 74.170582][ T9314] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 74.178761][ T9314] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 74.187979][ T9314] Kernel Offset: disabled [ 74.192355][ T9314] Rebooting in 86400 seconds..