[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 69.037377][ T26] audit: type=1800 audit(1563324676.522:25): pid=9052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 69.076031][ T26] audit: type=1800 audit(1563324676.522:26): pid=9052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 69.119767][ T26] audit: type=1800 audit(1563324676.522:27): pid=9052 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 '10.128.0.171' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 79.414029][ T9204] ------------[ cut here ]------------ [ 79.419552][ T9204] verifier backtracking bug [ 79.419640][ T9204] WARNING: CPU: 1 PID: 9204 at kernel/bpf/verifier.c:1785 __mark_chain_precision+0x19bb/0x1ee0 [ 79.435407][ T9204] Kernel panic - not syncing: panic_on_warn set ... [ 79.442024][ T9204] CPU: 1 PID: 9204 Comm: syz-executor677 Not tainted 5.2.0+ #66 [ 79.449634][ T9204] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.459844][ T9204] Call Trace: [ 79.463120][ T9204] dump_stack+0x172/0x1f0 [ 79.467437][ T9204] ? __mark_chain_precision+0x18c0/0x1ee0 [ 79.473141][ T9204] panic+0x2dc/0x755 [ 79.477200][ T9204] ? add_taint.cold+0x16/0x16 [ 79.481862][ T9204] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.488103][ T9204] ? __warn.cold+0x5/0x4c [ 79.492421][ T9204] ? __warn+0xe7/0x1e0 [ 79.496638][ T9204] ? __mark_chain_precision+0x19bb/0x1ee0 [ 79.502339][ T9204] __warn.cold+0x20/0x4c [ 79.506564][ T9204] ? vprintk_emit+0x1ea/0x700 [ 79.511232][ T9204] ? __mark_chain_precision+0x19bb/0x1ee0 [ 79.516945][ T9204] report_bug+0x263/0x2b0 [ 79.521272][ T9204] do_error_trap+0x11b/0x200 [ 79.525865][ T9204] do_invalid_op+0x37/0x50 [ 79.530292][ T9204] ? __mark_chain_precision+0x19bb/0x1ee0 [ 79.536087][ T9204] invalid_op+0x14/0x20 [ 79.540233][ T9204] RIP: 0010:__mark_chain_precision+0x19bb/0x1ee0 [ 79.546549][ T9204] Code: 08 31 ff 89 de e8 d5 b2 f2 ff 84 db 0f 85 ce fe ff ff e8 88 b1 f2 ff 48 c7 c7 a0 78 91 87 c6 05 3e 2d 1f 08 01 e8 6d 5b c4 ff <0f> 0b 41 bc f2 ff ff ff e9 af fe ff ff e8 33 97 2c 00 e9 c2 e7 ff [ 79.566149][ T9204] RSP: 0018:ffff8880a142f380 EFLAGS: 00010286 [ 79.572217][ T9204] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 79.580173][ T9204] RDX: 0000000000000000 RSI: ffffffff815c1016 RDI: ffffed1014285e62 [ 79.588127][ T9204] RBP: ffff8880a142f4d0 R08: ffff8880a17443c0 R09: 0000000000000000 [ 79.596100][ T9204] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 79.604189][ T9204] R13: ffff88809f9b8c00 R14: 0000000000000001 R15: ffff8880a2024200 [ 79.612160][ T9204] ? vprintk_func+0x86/0x189 [ 79.616759][ T9204] ? print_verifier_state+0x11b0/0x11b0 [ 79.622289][ T9204] ? __x64_sys_bpf+0x73/0xb0 [ 79.626863][ T9204] ? bpf_verifier_log_write+0x240/0x240 [ 79.632394][ T9204] ? check_reg_arg+0x1f1/0x480 [ 79.637164][ T9204] ? apparmor_capable+0x2ed/0x630 [ 79.642174][ T9204] check_cond_jmp_op+0xcd8/0x3c30 [ 79.647203][ T9204] ? find_held_lock+0x35/0x130 [ 79.651955][ T9204] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 79.657786][ T9204] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.664033][ T9204] ? check_func_arg+0x11c0/0x11c0 [ 79.669056][ T9204] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.675290][ T9204] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.681533][ T9204] ? krealloc+0x7b/0xd0 [ 79.685677][ T9204] ? krealloc+0x7b/0xd0 [ 79.689897][ T9204] ? rcu_read_lock_sched_held+0x110/0x130 [ 79.695609][ T9204] ? kfree+0x28b/0x2c0 [ 79.699688][ T9204] ? krealloc+0x7b/0xd0 [ 79.703857][ T9204] ? push_jmp_history.isra.0+0x1a9/0x260 [ 79.709487][ T9204] do_check+0x6389/0x8a50 [ 79.713843][ T9204] ? find_held_lock+0x35/0x130 [ 79.718609][ T9204] ? check_helper_call+0x3210/0x3210 [ 79.723906][ T9204] ? kfree+0x226/0x2c0 [ 79.727960][ T9204] ? kvfree+0x61/0x70 [ 79.731937][ T9204] ? kfree+0x226/0x2c0 [ 79.735994][ T9204] ? lockdep_hardirqs_on+0x418/0x5d0 [ 79.741265][ T9204] ? trace_hardirqs_on+0x67/0x240 [ 79.746363][ T9204] ? kvfree+0x61/0x70 [ 79.750333][ T9204] bpf_check+0x6f99/0x9950 [ 79.754782][ T9204] ? do_check+0x8a50/0x8a50 [ 79.759277][ T9204] ? lock_downgrade+0x920/0x920 [ 79.764210][ T9204] ? ktime_get_with_offset+0x13a/0x360 [ 79.769660][ T9204] ? bpf_prog_load+0xdce/0x1670 [ 79.774499][ T9204] ? ktime_get_with_offset+0x13a/0x360 [ 79.779951][ T9204] ? lockdep_hardirqs_on+0x418/0x5d0 [ 79.785244][ T9204] ? trace_hardirqs_on+0x67/0x240 [ 79.790264][ T9204] ? memset+0x32/0x40 [ 79.794238][ T9204] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 79.800498][ T9204] ? bpf_obj_name_cpy+0x13f/0x190 [ 79.805539][ T9204] bpf_prog_load+0xe68/0x1670 [ 79.810208][ T9204] ? bpf_prog_new_fd+0x60/0x60 [ 79.815095][ T9204] ? lock_downgrade+0x920/0x920 [ 79.819976][ T9204] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 79.826222][ T9204] ? security_bpf+0x8b/0xc0 [ 79.830729][ T9204] __do_sys_bpf+0xa46/0x42f0 [ 79.835319][ T9204] ? bpf_prog_load+0x1670/0x1670 [ 79.840267][ T9204] ? lock_downgrade+0x920/0x920 [ 79.845115][ T9204] ? __kasan_check_write+0x14/0x20 [ 79.850211][ T9204] ? up_read+0x159/0x570 [ 79.854447][ T9204] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 79.859977][ T9204] ? do_syscall_64+0x26/0x6a0 [ 79.864634][ T9204] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.870794][ T9204] ? do_syscall_64+0x26/0x6a0 [ 79.875690][ T9204] __x64_sys_bpf+0x73/0xb0 [ 79.880116][ T9204] do_syscall_64+0xfd/0x6a0 [ 79.884631][ T9204] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.890522][ T9204] RIP: 0033:0x440369 [ 79.894402][ T9204] 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 [ 79.914136][ T9204] RSP: 002b:00007ffcba804428 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 79.922538][ T9204] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 79.930494][ T9204] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 79.938482][ T9204] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 79.946552][ T9204] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 79.954537][ T9204] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 79.963564][ T9204] Kernel Offset: disabled [ 79.968165][ T9204] Rebooting in 86400 seconds..