[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 67.435314][ T7076] ------------[ cut here ]------------ [ 67.440955][ T7076] WARNING: CPU: 1 PID: 7076 at fs/overlayfs/file.c:66 ovl_real_fdget_meta+0x49c/0x530 [ 67.450587][ T7076] Kernel panic - not syncing: panic_on_warn set ... [ 67.457191][ T7076] CPU: 1 PID: 7076 Comm: syz-executor943 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 67.467063][ T7076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.477099][ T7076] Call Trace: [ 67.480371][ T7076] dump_stack+0x188/0x20d [ 67.484679][ T7076] ? ovl_real_fdget_meta+0x440/0x530 [ 67.489977][ T7076] panic+0x2e3/0x75c [ 67.493848][ T7076] ? add_taint.cold+0x16/0x16 [ 67.498629][ T7076] ? printk+0xba/0xed [ 67.502587][ T7076] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 67.508023][ T7076] ? __warn.cold+0x14/0x35 [ 67.512412][ T7076] ? __warn+0xd5/0x1c8 [ 67.516507][ T7076] ? ovl_real_fdget_meta+0x49c/0x530 [ 67.521767][ T7076] __warn.cold+0x2f/0x35 [ 67.525986][ T7076] ? ovl_real_fdget_meta+0x49c/0x530 [ 67.531256][ T7076] report_bug+0x27b/0x2f0 [ 67.535562][ T7076] do_error_trap+0x12b/0x220 [ 67.540126][ T7076] ? ovl_real_fdget_meta+0x49c/0x530 [ 67.545408][ T7076] do_invalid_op+0x32/0x40 [ 67.549819][ T7076] ? ovl_real_fdget_meta+0x49c/0x530 [ 67.555094][ T7076] invalid_op+0x23/0x30 [ 67.559234][ T7076] RIP: 0010:ovl_real_fdget_meta+0x49c/0x530 [ 67.565101][ T7076] Code: ff 4c 89 ff e8 15 b8 2d ff e9 ff fc ff ff e8 0b b8 2d ff e9 c5 fc ff ff 4c 89 f7 e8 6e b8 2d ff e9 5d fd ff ff e8 34 97 ef fe <0f> 0b 41 bd fb ff ff ff e9 fd fc ff ff e8 f2 b7 2d ff e9 84 fb ff [ 67.584765][ T7076] RSP: 0018:ffffc900011d7ba0 EFLAGS: 00010293 [ 67.590806][ T7076] RAX: ffff888095ada240 RBX: 0000000000002000 RCX: ffffffff82839b29 [ 67.598751][ T7076] RDX: 0000000000000000 RSI: ffffffff82839d5c RDI: 0000000000000005 [ 67.606698][ T7076] RBP: 0000000004068002 R08: ffff888095ada240 R09: ffffed1013e17d81 [ 67.614646][ T7076] R10: ffff88809f0bec03 R11: ffffed1013e17d80 R12: ffff888093cc3580 [ 67.622591][ T7076] R13: ffff8880887393b8 R14: 000000000002a002 R15: ffff888093cc3600 [ 67.630550][ T7076] ? ovl_real_fdget_meta+0x269/0x530 [ 67.635811][ T7076] ? ovl_real_fdget_meta+0x49c/0x530 [ 67.641074][ T7076] ovl_write_iter+0x3da/0x11a0 [ 67.645815][ T7076] ? ovl_open+0x270/0x270 [ 67.650119][ T7076] ? mark_held_locks+0xe0/0xe0 [ 67.654857][ T7076] ? locks_lock_inode_wait+0x400/0x400 [ 67.660479][ T7076] new_sync_write+0x4a2/0x700 [ 67.665131][ T7076] ? new_sync_read+0x7a0/0x7a0 [ 67.669878][ T7076] ? rcu_read_lock_any_held+0xcd/0xf0 [ 67.675223][ T7076] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 67.680513][ T7076] __vfs_write+0xc9/0x100 [ 67.684826][ T7076] vfs_write+0x268/0x5d0 [ 67.689047][ T7076] ksys_write+0x12d/0x250 [ 67.693350][ T7076] ? __ia32_sys_read+0xb0/0xb0 [ 67.698100][ T7076] ? trace_hardirqs_off_caller+0x55/0x230 [ 67.703797][ T7076] do_syscall_64+0xf6/0x7d0 [ 67.708286][ T7076] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 67.714149][ T7076] RIP: 0033:0x440309 [ 67.718019][ T7076] 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 [ 67.737593][ T7076] RSP: 002b:00007ffd92aa3ab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 67.745977][ T7076] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 67.753937][ T7076] RDX: 0000000000000001 RSI: 0000000020000340 RDI: 0000000000000003 [ 67.761881][ T7076] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 67.769825][ T7076] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 67.777769][ T7076] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 67.787021][ T7076] Kernel Offset: disabled [ 67.791396][ T7076] Rebooting in 86400 seconds..