[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.168088][ T26] audit: type=1800 audit(1566954057.778:25): pid=8643 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.209947][ T26] audit: type=1800 audit(1566954057.788:26): pid=8643 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.252462][ T26] audit: type=1800 audit(1566954057.788:27): pid=8643 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 '10.128.1.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 66.220767][ T8795] ------------[ cut here ]------------ [ 66.226788][ T8795] verifier backtracking bug [ 66.226882][ T8795] WARNING: CPU: 0 PID: 8795 at kernel/bpf/verifier.c:1782 __mark_chain_precision+0x197a/0x1ea0 [ 66.242741][ T8795] Kernel panic - not syncing: panic_on_warn set ... [ 66.250140][ T8795] CPU: 0 PID: 8795 Comm: syz-executor439 Not tainted 5.3.0-rc3+ #101 [ 66.258501][ T8795] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.268954][ T8795] Call Trace: [ 66.272576][ T8795] dump_stack+0x172/0x1f0 [ 66.277363][ T8795] ? __mark_chain_precision+0x1940/0x1ea0 [ 66.283537][ T8795] panic+0x2dc/0x755 [ 66.287904][ T8795] ? add_taint.cold+0x16/0x16 [ 66.292892][ T8795] ? __kasan_check_write+0x14/0x20 [ 66.298355][ T8795] ? __warn.cold+0x5/0x4c [ 66.302697][ T8795] ? __warn+0xe7/0x1e0 [ 66.306921][ T8795] ? __mark_chain_precision+0x197a/0x1ea0 [ 66.312648][ T8795] __warn.cold+0x20/0x4c [ 66.316994][ T8795] ? vprintk_emit+0x1ea/0x700 [ 66.321764][ T8795] ? __mark_chain_precision+0x197a/0x1ea0 [ 66.328036][ T8795] report_bug+0x263/0x2b0 [ 66.332534][ T8795] do_error_trap+0x11b/0x200 [ 66.337856][ T8795] do_invalid_op+0x37/0x50 [ 66.342379][ T8795] ? __mark_chain_precision+0x197a/0x1ea0 [ 66.348399][ T8795] invalid_op+0x23/0x30 [ 66.352807][ T8795] RIP: 0010:__mark_chain_precision+0x197a/0x1ea0 [ 66.359550][ T8795] Code: 08 31 ff 89 de e8 a6 9e f2 ff 84 db 0f 85 07 ff ff ff e8 59 9d f2 ff 48 c7 c7 a0 a7 91 87 c6 05 3d c6 21 08 01 e8 1e 10 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 e8 fe ff ff 48 8b bd d8 fe ff ff e8 cd [ 66.380134][ T8795] RSP: 0018:ffff88808609f380 EFLAGS: 00010286 [ 66.386486][ T8795] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 66.395857][ T8795] RDX: 0000000000000000 RSI: ffffffff815c3ba6 RDI: ffffed1010c13e62 [ 66.404194][ T8795] RBP: ffff88808609f4d0 R08: ffff8880a97940c0 R09: 0000000000000000 [ 66.412553][ T8795] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 66.420720][ T8795] R13: ffff8880985b6cc0 R14: ffff88808e538e80 R15: ffff88808609f468 [ 66.429515][ T8795] ? vprintk_func+0x86/0x189 [ 66.434126][ T8795] ? print_verifier_state+0x11b0/0x11b0 [ 66.440203][ T8795] ? __do_sys_bpf+0xa44/0x3350 [ 66.445812][ T8795] ? bpf_verifier_log_write+0x240/0x240 [ 66.451363][ T8795] ? check_reg_arg+0x1f1/0x480 [ 66.456149][ T8795] check_cond_jmp_op+0xcd8/0x3c30 [ 66.461286][ T8795] ? check_func_arg+0x11c0/0x11c0 [ 66.466826][ T8795] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.473521][ T8795] ? realloc_stack_state+0x29f/0x320 [ 66.478805][ T8795] ? realloc_stack_state+0x29f/0x320 [ 66.484107][ T8795] ? rcu_read_lock_sched_held+0x110/0x130 [ 66.489912][ T8795] ? kfree+0x28b/0x2c0 [ 66.496288][ T8795] ? realloc_stack_state+0xa2/0x320 [ 66.501526][ T8795] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.507812][ T8795] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.514075][ T8795] ? do_check+0x104f/0x8a30 [ 66.518577][ T8795] ? do_check+0x104f/0x8a30 [ 66.523379][ T8795] ? rcu_read_lock_sched_held+0x110/0x130 [ 66.529595][ T8795] do_check+0x63cd/0x8a30 [ 66.533982][ T8795] ? find_held_lock+0x35/0x130 [ 66.538932][ T8795] ? check_helper_call+0x32f0/0x32f0 [ 66.544233][ T8795] ? kfree+0x226/0x2c0 [ 66.548313][ T8795] ? kvfree+0x61/0x70 [ 66.552296][ T8795] ? kfree+0x226/0x2c0 [ 66.556491][ T8795] ? lockdep_hardirqs_on+0x418/0x5d0 [ 66.561763][ T8795] ? trace_hardirqs_on+0x67/0x240 [ 66.566870][ T8795] ? kvfree+0x61/0x70 [ 66.571023][ T8795] bpf_check+0x6fff/0x99b2 [ 66.575981][ T8795] ? do_check+0x8a30/0x8a30 [ 66.580576][ T8795] ? lock_downgrade+0x920/0x920 [ 66.585438][ T8795] ? ktime_get_with_offset+0x13a/0x350 [ 66.598327][ T8795] ? bpf_prog_load+0xdce/0x1670 [ 66.603295][ T8795] ? ktime_get_with_offset+0x13a/0x350 [ 66.608764][ T8795] ? lockdep_hardirqs_on+0x418/0x5d0 [ 66.614035][ T8795] ? trace_hardirqs_on+0x67/0x240 [ 66.619043][ T8795] ? memset+0x32/0x40 [ 66.623020][ T8795] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 66.629272][ T8795] ? bpf_obj_name_cpy+0x13f/0x190 [ 66.634382][ T8795] bpf_prog_load+0xe68/0x1670 [ 66.639061][ T8795] ? bpf_prog_new_fd+0x60/0x60 [ 66.643854][ T8795] ? lock_downgrade+0x920/0x920 [ 66.648875][ T8795] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 66.655544][ T8795] ? security_bpf+0x8b/0xc0 [ 66.660071][ T8795] __do_sys_bpf+0xa44/0x3350 [ 66.664660][ T8795] ? bpf_prog_load+0x1670/0x1670 [ 66.669590][ T8795] ? lock_downgrade+0x920/0x920 [ 66.674543][ T8795] ? __kasan_check_write+0x14/0x20 [ 66.679658][ T8795] ? up_read+0x159/0x570 [ 66.683902][ T8795] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 66.689352][ T8795] ? do_syscall_64+0x26/0x6a0 [ 66.694182][ T8795] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.702501][ T8795] ? do_syscall_64+0x26/0x6a0 [ 66.707466][ T8795] __x64_sys_bpf+0x73/0xb0 [ 66.711885][ T8795] do_syscall_64+0xfd/0x6a0 [ 66.716389][ T8795] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.722308][ T8795] RIP: 0033:0x4402a9 [ 66.726192][ T8795] 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 [ 66.747131][ T8795] RSP: 002b:00007ffc52f10618 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 66.755631][ T8795] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402a9 [ 66.763606][ T8795] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 66.771687][ T8795] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 66.779678][ T8795] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401b30 [ 66.787654][ T8795] R13: 0000000000401bc0 R14: 0000000000000000 R15: 0000000000000000 [ 66.798369][ T8795] Kernel Offset: disabled [ 66.838648][ T8795] Rebooting in 86400 seconds..