[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.112' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.244585][ T27] audit: type=1400 audit(1587586554.638:8): avc: denied { execmem } for pid=7035 comm="syz-executor073" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 68.273921][ T7035] ------------[ cut here ]------------ [ 68.279602][ T7035] WARNING: CPU: 1 PID: 7035 at fs/overlayfs/file.c:66 ovl_real_fdget_meta+0x49c/0x530 [ 68.290001][ T7035] Kernel panic - not syncing: panic_on_warn set ... [ 68.296692][ T7035] CPU: 1 PID: 7035 Comm: syz-executor073 Not tainted 5.7.0-rc2-syzkaller #0 [ 68.305343][ T7035] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.315399][ T7035] Call Trace: [ 68.318687][ T7035] dump_stack+0x188/0x20d [ 68.323002][ T7035] ? ovl_real_fdget_meta+0x440/0x530 [ 68.328440][ T7035] panic+0x2e3/0x75c [ 68.332324][ T7035] ? add_taint.cold+0x16/0x16 [ 68.337015][ T7035] ? printk+0xba/0xed [ 68.340997][ T7035] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 68.346454][ T7035] ? __warn.cold+0x14/0x35 [ 68.350874][ T7035] ? __warn+0xd5/0x1c8 [ 68.354927][ T7035] ? ovl_real_fdget_meta+0x49c/0x530 [ 68.360380][ T7035] __warn.cold+0x2f/0x35 [ 68.366475][ T7035] ? ovl_real_fdget_meta+0x49c/0x530 [ 68.371787][ T7035] report_bug+0x27b/0x2f0 [ 68.376203][ T7035] do_error_trap+0x12b/0x220 [ 68.380882][ T7035] ? ovl_real_fdget_meta+0x49c/0x530 [ 68.386300][ T7035] do_invalid_op+0x32/0x40 [ 68.391427][ T7035] ? ovl_real_fdget_meta+0x49c/0x530 [ 68.397345][ T7035] invalid_op+0x23/0x30 [ 68.401642][ T7035] RIP: 0010:ovl_real_fdget_meta+0x49c/0x530 [ 68.407525][ T7035] Code: ff 4c 89 ff e8 25 de 2d ff e9 ff fc ff ff e8 1b de 2d ff e9 c5 fc ff ff 4c 89 f7 e8 7e de 2d ff e9 5d fd ff ff e8 54 17 f0 fe <0f> 0b 41 bd fb ff ff ff e9 fd fc ff ff e8 02 de 2d ff e9 84 fb ff [ 68.427535][ T7035] RSP: 0018:ffffc90000f17ba0 EFLAGS: 00010293 [ 68.433596][ T7035] RAX: ffff8880945bc280 RBX: 0000000000002000 RCX: ffffffff82831529 [ 68.441553][ T7035] RDX: 0000000000000000 RSI: ffffffff8283175c RDI: 0000000000000005 [ 68.449709][ T7035] RBP: 0000000004068002 R08: ffff8880945bc280 R09: ffffed1014180d21 [ 68.457688][ T7035] R10: ffff8880a0c06903 R11: ffffed1014180d20 R12: ffff8880a2ef55c0 [ 68.465670][ T7035] R13: ffff888084a15738 R14: 000000000002a002 R15: ffff8880a2ef5640 [ 68.473646][ T7035] ? ovl_real_fdget_meta+0x269/0x530 [ 68.478929][ T7035] ? ovl_real_fdget_meta+0x49c/0x530 [ 68.484197][ T7035] ovl_write_iter+0x3da/0x11a0 [ 68.489003][ T7035] ? ovl_open+0x270/0x270 [ 68.493430][ T7035] ? mark_held_locks+0xe0/0xe0 [ 68.498238][ T7035] ? locks_lock_inode_wait+0x400/0x400 [ 68.503961][ T7035] new_sync_write+0x4a2/0x700 [ 68.508629][ T7035] ? new_sync_read+0x7a0/0x7a0 [ 68.513729][ T7035] ? rcu_read_lock_any_held+0xcd/0xf0 [ 68.519079][ T7035] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 68.524609][ T7035] __vfs_write+0xc9/0x100 [ 68.528931][ T7035] vfs_write+0x268/0x5d0 [ 68.533374][ T7035] ksys_write+0x12d/0x250 [ 68.537698][ T7035] ? __ia32_sys_read+0xb0/0xb0 [ 68.542868][ T7035] ? trace_hardirqs_off_caller+0x55/0x230 [ 68.548611][ T7035] do_syscall_64+0xf6/0x7d0 [ 68.553115][ T7035] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 68.559005][ T7035] RIP: 0033:0x440309 [ 68.562876][ T7035] 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 [ 68.582473][ T7035] RSP: 002b:00007ffdecf014b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 68.591024][ T7035] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 68.599430][ T7035] RDX: 0000000000000001 RSI: 0000000020000340 RDI: 0000000000000003 [ 68.607487][ T7035] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 68.615451][ T7035] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 68.623665][ T7035] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 68.633737][ T7035] Kernel Offset: disabled [ 68.638144][ T7035] Rebooting in 86400 seconds..