[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.160359][ T27] audit: type=1800 audit(1562660003.329:25): pid=9133 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.200757][ T27] audit: type=1800 audit(1562660003.329:26): pid=9133 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.246710][ T27] audit: type=1800 audit(1562660003.329:27): pid=9133 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 '10.128.0.121' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 83.388775][ T9286] ------------[ cut here ]------------ [ 83.394425][ T9286] verifier backtracking bug [ 83.394508][ T9286] WARNING: CPU: 1 PID: 9286 at kernel/bpf/verifier.c:1785 __mark_chain_precision+0x19bb/0x1ee0 [ 83.409439][ T9286] Kernel panic - not syncing: panic_on_warn set ... [ 83.416024][ T9286] CPU: 1 PID: 9286 Comm: syz-executor496 Not tainted 5.2.0-next-20190708 #33 [ 83.424927][ T9286] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.434977][ T9286] Call Trace: [ 83.438261][ T9286] dump_stack+0x172/0x1f0 [ 83.442742][ T9286] ? __mark_chain_precision+0x1980/0x1ee0 [ 83.448456][ T9286] panic+0x2dc/0x755 [ 83.452348][ T9286] ? add_taint.cold+0x16/0x16 [ 83.457200][ T9286] ? __kasan_check_read+0x11/0x20 [ 83.462226][ T9286] ? __warn.cold+0x5/0x4c [ 83.466547][ T9286] ? __warn+0xe7/0x1e0 [ 83.470627][ T9286] ? __mark_chain_precision+0x19bb/0x1ee0 [ 83.476476][ T9286] __warn.cold+0x20/0x4c [ 83.480724][ T9286] ? vprintk_emit+0x1ea/0x700 [ 83.485574][ T9286] ? __mark_chain_precision+0x19bb/0x1ee0 [ 83.491300][ T9286] report_bug+0x263/0x2b0 [ 83.495658][ T9286] do_error_trap+0x11b/0x200 [ 83.500417][ T9286] do_invalid_op+0x37/0x50 [ 83.504831][ T9286] ? __mark_chain_precision+0x19bb/0x1ee0 [ 83.510542][ T9286] invalid_op+0x14/0x20 [ 83.514692][ T9286] RIP: 0010:__mark_chain_precision+0x19bb/0x1ee0 [ 83.521016][ T9286] Code: 08 31 ff 89 de e8 95 a1 f2 ff 84 db 0f 85 ce fe ff ff e8 48 a0 f2 ff 48 c7 c7 e0 9c 91 87 c6 05 3f 6b 21 08 01 e8 4d 09 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 af fe ff ff e8 c3 df 2c 00 e9 c2 e7 ff [ 83.540709][ T9286] RSP: 0018:ffff8880989ef380 EFLAGS: 00010286 [ 83.547057][ T9286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 83.555027][ T9286] RDX: 0000000000000000 RSI: ffffffff815c0a86 RDI: ffffed101313de62 [ 83.562995][ T9286] RBP: ffff8880989ef4d0 R08: ffff8880a6330480 R09: 0000000000000000 [ 83.570959][ T9286] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 83.579104][ T9286] R13: ffff8880a1cfcbc0 R14: 0000000000000001 R15: ffff888086bd4340 [ 83.587086][ T9286] ? vprintk_func+0x86/0x189 [ 83.591794][ T9286] ? print_verifier_state+0x11b0/0x11b0 [ 83.597807][ T9286] ? __x64_sys_bpf+0x73/0xb0 [ 83.602637][ T9286] ? bpf_verifier_log_write+0x240/0x240 [ 83.608314][ T9286] ? check_reg_arg+0x1f1/0x480 [ 83.613238][ T9286] ? apparmor_capable+0x2ed/0x630 [ 83.622281][ T9286] check_cond_jmp_op+0xcd8/0x3c30 [ 83.627485][ T9286] ? find_held_lock+0x35/0x130 [ 83.632727][ T9286] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 83.638368][ T9286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 83.644632][ T9286] ? check_func_arg+0x11c0/0x11c0 [ 83.649655][ T9286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 83.655895][ T9286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 83.662219][ T9286] ? krealloc+0x7b/0xd0 [ 83.666394][ T9286] ? krealloc+0x7b/0xd0 [ 83.670704][ T9286] ? rcu_read_lock_sched_held+0x110/0x130 [ 83.676556][ T9286] ? kfree+0x28b/0x2c0 [ 83.681250][ T9286] ? krealloc+0x7b/0xd0 [ 83.685821][ T9286] ? push_jmp_history.isra.0+0x1a9/0x260 [ 83.691611][ T9286] do_check+0x6389/0x8a50 [ 83.695936][ T9286] ? find_held_lock+0x35/0x130 [ 83.701166][ T9286] ? check_helper_call+0x3210/0x3210 [ 83.706453][ T9286] ? kfree+0x226/0x2c0 [ 83.710770][ T9286] ? kvfree+0x61/0x70 [ 83.714966][ T9286] ? kfree+0x226/0x2c0 [ 83.719031][ T9286] ? lockdep_hardirqs_on+0x418/0x5d0 [ 83.724311][ T9286] ? trace_hardirqs_on+0x67/0x240 [ 83.729327][ T9286] ? kvfree+0x61/0x70 [ 83.733567][ T9286] bpf_check+0x6f99/0x9948 [ 83.737983][ T9286] ? do_check+0x8a50/0x8a50 [ 83.742482][ T9286] ? lock_downgrade+0x920/0x920 [ 83.747417][ T9286] ? ktime_get_with_offset+0x13a/0x350 [ 83.752878][ T9286] ? bpf_prog_load+0xdce/0x1670 [ 83.757858][ T9286] ? ktime_get_with_offset+0x13a/0x350 [ 83.763316][ T9286] ? lockdep_hardirqs_on+0x418/0x5d0 [ 83.768596][ T9286] ? trace_hardirqs_on+0x67/0x240 [ 83.773616][ T9286] ? memset+0x32/0x40 [ 83.777743][ T9286] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 83.783980][ T9286] ? bpf_obj_name_cpy+0x13f/0x190 [ 83.789002][ T9286] bpf_prog_load+0xe68/0x1670 [ 83.793784][ T9286] ? bpf_prog_new_fd+0x60/0x60 [ 83.798685][ T9286] ? lock_downgrade+0x920/0x920 [ 83.803544][ T9286] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 83.809776][ T9286] ? security_bpf+0x8b/0xc0 [ 83.814396][ T9286] __do_sys_bpf+0xa46/0x42f0 [ 83.818983][ T9286] ? bpf_prog_load+0x1670/0x1670 [ 83.823913][ T9286] ? lock_downgrade+0x920/0x920 [ 83.828761][ T9286] ? __kasan_check_read+0x11/0x20 [ 83.833778][ T9286] ? up_read+0x159/0x570 [ 83.838018][ T9286] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 83.843632][ T9286] ? do_syscall_64+0x26/0x6a0 [ 83.848305][ T9286] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 83.854562][ T9286] ? do_syscall_64+0x26/0x6a0 [ 83.859417][ T9286] __x64_sys_bpf+0x73/0xb0 [ 83.863837][ T9286] do_syscall_64+0xfd/0x6a0 [ 83.868840][ T9286] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 83.875011][ T9286] RIP: 0033:0x440369 [ 83.878994][ T9286] 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 [ 83.898768][ T9286] RSP: 002b:00007ffd87948588 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 83.907257][ T9286] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 83.915596][ T9286] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 83.923657][ T9286] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 83.931861][ T9286] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 83.939839][ T9286] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 83.949194][ T9286] Kernel Offset: disabled [ 83.953739][ T9286] Rebooting in 86400 seconds..