[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.516709][ T27] audit: type=1800 audit(1577302586.643:25): pid=8992 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 66.541121][ T27] audit: type=1800 audit(1577302586.653:26): pid=8992 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 66.590535][ T27] audit: type=1800 audit(1577302586.653:27): pid=8992 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 '10.128.0.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 78.215151][ T9146] ------------[ cut here ]------------ [ 78.220644][ T9146] WARNING: CPU: 0 PID: 9146 at fs/overlayfs/file.c:55 ovl_real_fdget_meta+0x4a3/0x540 [ 78.230162][ T9146] Kernel panic - not syncing: panic_on_warn set ... [ 78.236742][ T9146] CPU: 0 PID: 9146 Comm: syz-executor281 Not tainted 5.5.0-rc3-syzkaller #0 [ 78.245434][ T9146] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.255471][ T9146] Call Trace: [ 78.258747][ T9146] dump_stack+0x197/0x210 [ 78.263057][ T9146] ? ovl_real_fdget_meta+0x450/0x540 [ 78.268359][ T9146] panic+0x2e3/0x75c [ 78.272232][ T9146] ? add_taint.cold+0x16/0x16 [ 78.276888][ T9146] ? printk+0xba/0xed [ 78.280880][ T9146] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 78.286324][ T9146] ? __warn.cold+0x14/0x3e [ 78.290716][ T9146] ? __warn+0xd9/0x1cf [ 78.294781][ T9146] ? ovl_real_fdget_meta+0x4a3/0x540 [ 78.300043][ T9146] __warn.cold+0x2f/0x3e [ 78.304262][ T9146] ? report_bug.cold+0x63/0xb2 [ 78.309014][ T9146] ? ovl_real_fdget_meta+0x4a3/0x540 [ 78.314278][ T9146] report_bug+0x289/0x300 [ 78.318588][ T9146] do_error_trap+0x11b/0x200 [ 78.323160][ T9146] do_invalid_op+0x37/0x50 [ 78.327551][ T9146] ? ovl_real_fdget_meta+0x4a3/0x540 [ 78.332813][ T9146] invalid_op+0x23/0x30 [ 78.336947][ T9146] RIP: 0010:ovl_real_fdget_meta+0x4a3/0x540 [ 78.342815][ T9146] Code: ff 4c 89 f7 e8 7e b5 2d ff e9 fb fc ff ff e8 74 b5 2d ff e9 c7 fc ff ff 4c 89 f7 e8 07 b6 2d ff e9 5e fd ff ff e8 9d fc ef fe <0f> 0b 41 bc fb ff ff ff e9 f9 fc ff ff e8 6b b5 2d ff e9 85 fb ff [ 78.362394][ T9146] RSP: 0018:ffffc90001ea73e8 EFLAGS: 00010293 [ 78.368438][ T9146] RAX: ffff8880a761e4c0 RBX: 0000000004048000 RCX: ffffffff82852f26 [ 78.376386][ T9146] RDX: 0000000000000000 RSI: ffffffff82853153 RDI: 0000000000000005 [ 78.384333][ T9146] RBP: ffffc90001ea7418 R08: ffff8880a761e4c0 R09: 0000000000000000 [ 78.392283][ T9146] R10: ffffed1043789756 R11: ffff88821bc4bab3 R12: 000000000000a000 [ 78.400229][ T9146] R13: ffff8880a966f280 R14: ffff8880a966f2f8 R15: ffff88809017c648 [ 78.408187][ T9146] ? ovl_real_fdget_meta+0x276/0x540 [ 78.413450][ T9146] ? ovl_real_fdget_meta+0x4a3/0x540 [ 78.418714][ T9146] ? ovl_real_fdget_meta+0x4a3/0x540 [ 78.423984][ T9146] ovl_read_iter+0x11a/0x370 [ 78.429510][ T9146] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.435728][ T9146] ? ovl_mmap+0x300/0x300 [ 78.440038][ T9146] ? fsnotify+0xbb0/0xbb0 [ 78.444346][ T9146] do_iter_readv_writev+0x711/0x8f0 [ 78.449538][ T9146] ? no_seek_end_llseek_size+0x70/0x70 [ 78.454982][ T9146] ? rw_verify_area+0x126/0x360 [ 78.459811][ T9146] do_iter_read+0x27c/0x660 [ 78.464290][ T9146] ? dup_iter+0x260/0x260 [ 78.468614][ T9146] vfs_readv+0xf0/0x160 [ 78.472749][ T9146] ? compat_rw_copy_check_uvector+0x4c0/0x4c0 [ 78.478792][ T9146] ? push_pipe+0x3e2/0x6a0 [ 78.483192][ T9146] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 78.489406][ T9146] ? iov_iter_get_pages_alloc+0x3a5/0x15b0 [ 78.495195][ T9146] ? iov_iter_for_each_range+0x7d0/0x7d0 [ 78.500818][ T9146] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 78.506516][ T9146] default_file_splice_read+0x4fb/0xa20 [ 78.512040][ T9146] ? kasan_kmalloc+0x9/0x10 [ 78.516519][ T9146] ? __kmalloc+0x163/0x770 [ 78.520909][ T9146] ? alloc_pipe_info+0x1ee/0x4f0 [ 78.525829][ T9146] ? iter_file_splice_write+0xc10/0xc10 [ 78.531352][ T9146] ? __lock_acquire+0x16f2/0x4a00 [ 78.536349][ T9146] ? __lock_acquire+0x16f2/0x4a00 [ 78.541352][ T9146] ? cache_grow_end+0xa4/0x190 [ 78.546102][ T9146] ? find_held_lock+0x35/0x130 [ 78.550843][ T9146] ? cache_grow_end+0xa4/0x190 [ 78.555594][ T9146] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.561812][ T9146] ? fsnotify+0x7fd/0xbb0 [ 78.566135][ T9146] ? security_file_permission+0x8f/0x380 [ 78.571758][ T9146] ? rw_verify_area+0x126/0x360 [ 78.576595][ T9146] ? iter_file_splice_write+0xc10/0xc10 [ 78.582117][ T9146] do_splice_to+0x127/0x180 [ 78.586600][ T9146] splice_direct_to_actor+0x320/0xa30 [ 78.591951][ T9146] ? generic_pipe_buf_nosteal+0x10/0x10 [ 78.597478][ T9146] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.603697][ T9146] ? do_splice_to+0x180/0x180 [ 78.608359][ T9146] ? rw_verify_area+0x126/0x360 [ 78.613187][ T9146] do_splice_direct+0x1da/0x2a0 [ 78.618015][ T9146] ? splice_direct_to_actor+0xa30/0xa30 [ 78.623553][ T9146] ? rw_verify_area+0x126/0x360 [ 78.628392][ T9146] do_sendfile+0x597/0xd00 [ 78.632792][ T9146] ? do_compat_pwritev64+0x1c0/0x1c0 [ 78.638054][ T9146] ? do_fcntl+0xb0/0x1030 [ 78.642363][ T9146] ? f_getown+0xc0/0xc0 [ 78.646509][ T9146] __x64_sys_sendfile64+0x1dd/0x220 [ 78.651693][ T9146] ? __ia32_sys_sendfile+0x230/0x230 [ 78.657566][ T9146] ? do_syscall_64+0x26/0x790 [ 78.662219][ T9146] ? lockdep_hardirqs_on+0x421/0x5e0 [ 78.667481][ T9146] ? trace_hardirqs_on+0x67/0x240 [ 78.672501][ T9146] do_syscall_64+0xfa/0x790 [ 78.676985][ T9146] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.682878][ T9146] RIP: 0033:0x4402f9 [ 78.686749][ T9146] 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 [ 78.706338][ T9146] RSP: 002b:00007fffe41d1178 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 78.714773][ T9146] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9 [ 78.722735][ T9146] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 [ 78.730693][ T9146] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 78.738645][ T9146] R10: 0000800000000024 R11: 0000000000000246 R12: 0000000000401b80 [ 78.746637][ T9146] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000 [ 78.756050][ T9146] Kernel Offset: disabled [ 78.760430][ T9146] Rebooting in 86400 seconds..