[ 41.486090] audit: type=1800 audit(1578719285.535:30): pid=7761 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 46.039849] kauditd_printk_skb: 4 callbacks suppressed [ 46.039865] audit: type=1400 audit(1578719290.115:35): avc: denied { map } for pid=7935 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. executing program [ 52.849103] audit: type=1400 audit(1578719296.925:36): avc: denied { map } for pid=7947 comm="syz-executor587" path="/root/syz-executor587839102" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 52.862574] ------------[ cut here ]------------ [ 52.875629] audit: type=1400 audit(1578719296.925:37): avc: denied { associate } for pid=7947 comm="syz-executor587" name="file0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 [ 52.880859] WARNING: CPU: 1 PID: 7947 at fs/overlayfs/file.c:58 ovl_real_fdget_meta.cold+0x11/0x1e [ 52.912059] Kernel panic - not syncing: panic_on_warn set ... [ 52.912059] [ 52.919434] CPU: 1 PID: 7947 Comm: syz-executor587 Not tainted 4.19.94-syzkaller #0 [ 52.927220] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.936565] Call Trace: [ 52.939148] dump_stack+0x197/0x210 [ 52.942763] panic+0x26a/0x50e [ 52.945939] ? __warn_printk+0xf3/0xf3 [ 52.949852] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 52.954680] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.960203] ? __warn.cold+0x5/0x53 [ 52.963809] ? __warn+0xe8/0x1d0 [ 52.967164] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 52.971989] __warn.cold+0x20/0x53 [ 52.975514] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 52.980343] report_bug+0x263/0x2b0 [ 52.983956] do_error_trap+0x204/0x360 [ 52.987829] ? math_error+0x340/0x340 [ 52.991614] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.997141] ? wake_up_klogd+0x99/0xd0 [ 53.001025] ? vprintk_emit+0x2a8/0x6d0 [ 53.005003] ? vprintk_emit+0x1ce/0x6d0 [ 53.008979] ? error_entry+0x7c/0xe0 [ 53.012684] ? trace_hardirqs_off_caller+0x65/0x220 [ 53.017698] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.022536] do_invalid_op+0x1b/0x20 [ 53.026236] invalid_op+0x14/0x20 [ 53.029676] RIP: 0010:ovl_real_fdget_meta.cold+0x11/0x1e [ 53.035165] Code: e9 b3 fd ff ff e8 fc ca 3f ff e9 fb fd ff ff e8 f2 ca 3f ff e9 15 fe ff ff e8 28 32 08 ff 48 c7 c7 20 20 d5 87 e8 b0 95 f2 fe <0f> 0b 41 bc fb ff ff ff e9 98 c6 ff ff e8 0a 32 08 ff 48 c7 c7 20 [ 53.054065] RSP: 0018:ffff88809a2c7ba0 EFLAGS: 00010282 [ 53.059463] RAX: 0000000000000024 RBX: 0000000004048000 RCX: 0000000000000000 [ 53.066721] RDX: 0000000000000000 RSI: ffffffff81558bb6 RDI: ffffed1013458f66 [ 53.073980] RBP: ffff88809a2c7bd0 R08: 0000000000000024 R09: ffffed1015d25079 [ 53.081233] R10: ffffed1015d25078 R11: ffff8880ae9283c7 R12: 000000000000a000 [ 53.088488] R13: ffff88809925ccc0 R14: ffff88809925cd38 R15: ffff8880949bf530 [ 53.095773] ? vprintk_func+0x86/0x189 [ 53.099708] ovl_read_iter+0x11a/0x363 [ 53.103586] ? ovl_mmap+0x2f0/0x2f0 [ 53.107204] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.112766] ? iov_iter_init+0xc6/0x1f0 [ 53.116728] __vfs_read+0x584/0x800 [ 53.120376] ? vfs_copy_file_range+0xba0/0xba0 [ 53.124969] ? __inode_security_revalidate+0xda/0x120 [ 53.130171] ? security_file_permission+0x89/0x230 [ 53.135157] ? rw_verify_area+0x118/0x360 [ 53.139304] vfs_read+0x194/0x3d0 [ 53.142784] ksys_read+0x14f/0x2d0 [ 53.146313] ? kernel_write+0x120/0x120 [ 53.150274] ? do_syscall_64+0x26/0x620 [ 53.154236] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.159583] ? do_syscall_64+0x26/0x620 [ 53.163544] __x64_sys_read+0x73/0xb0 [ 53.167332] do_syscall_64+0xfd/0x620 [ 53.171120] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.176294] RIP: 0033:0x4402b9 [ 53.179472] 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 [ 53.198359] RSP: 002b:00007ffc9f576bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 53.206056] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 53.213314] RDX: 0000000000001000 RSI: 0000000020000300 RDI: 0000000000000003 [ 53.220570] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 53.227826] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b40 [ 53.235084] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 53.243675] Kernel Offset: disabled [ 53.247357] Rebooting in 86400 seconds..