Warning: Permanently added '10.128.0.128' (ECDSA) to the list of known hosts.
syzkaller login: [   36.157484] IPVS: ftp: loaded support on port[0] = 21
executing program
[   36.224948] ------------[ cut here ]------------
[   36.230483] generic_make_request: Trying to write to read-only block-device loop0 (partno 0)
[   36.239480] WARNING: CPU: 0 PID: 8118 at block/blk-core.c:2183 generic_make_request_checks+0x17d9/0x22e0
[   36.249112] Kernel panic - not syncing: panic_on_warn set ...
[   36.249112] 
[   36.256493] CPU: 0 PID: 8118 Comm: syz-executor720 Not tainted 4.19.211-syzkaller #0
[   36.264372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   36.273809] Call Trace:
[   36.276382]  dump_stack+0x1fc/0x2ef
[   36.279991]  panic+0x26a/0x50e
[   36.283176]  ? __warn_printk+0xf3/0xf3
[   36.287048]  ? generic_make_request_checks+0x17d9/0x22e0
[   36.292506]  ? __probe_kernel_read+0x130/0x1b0
[   36.297155]  ? __warn.cold+0x5/0x5a
[   36.300759]  ? __warn+0xe4/0x200
[   36.304120]  ? generic_make_request_checks+0x17d9/0x22e0
[   36.309550]  __warn.cold+0x20/0x5a
[   36.313069]  ? io_schedule_timeout+0x140/0x140
[   36.317631]  ? generic_make_request_checks+0x17d9/0x22e0
[   36.323058]  report_bug+0x262/0x2b0
[   36.326668]  do_error_trap+0x1d7/0x310
[   36.330543]  ? math_error+0x310/0x310
[   36.334322]  ? irq_work_claim+0xa6/0xc0
[   36.338276]  ? irq_work_queue+0x29/0x80
[   36.342230]  ? error_entry+0x72/0xd0
[   36.345924]  ? trace_hardirqs_off_caller+0x6e/0x210
[   36.350921]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   36.355748]  invalid_op+0x14/0x20
[   36.359185] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0
[   36.365221] Code: ca 0a 00 00 45 8b b6 1c 05 00 00 48 8d 74 24 68 48 89 ef e8 b9 14 06 00 48 c7 c7 00 29 b2 88 48 89 c6 44 89 f2 e8 4c 94 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
[   36.384226] RSP: 0018:ffff888096c47898 EFLAGS: 00010286
[   36.389666] RAX: 0000000000000000 RBX: ffff8880aeff3040 RCX: 0000000000000000
[   36.396924] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012d88f05
[   36.404180] RBP: ffff8880aa5a3e80 R08: 0000000000000001 R09: 0000000000000000
[   36.411440] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aa5a3eb0
[   36.418695] R13: ffff8880aa5a3e88 R14: 0000000000000000 R15: 0000000000000000
[   36.425958]  ? vprintk_func+0x81/0x180
[   36.429834]  ? generic_make_request_checks+0x17d9/0x22e0
[   36.435265]  ? should_fail_bio.isra.0+0xa0/0xa0
[   36.439918]  ? rcu_read_lock_sched_held+0x16c/0x1d0
[   36.444918]  ? kmem_cache_alloc+0x315/0x370
[   36.449223]  generic_make_request+0x23f/0xdf0
[   36.453700]  ? blk_put_request+0x110/0x110
[   36.457926]  submit_bio+0xb1/0x430
[   36.461446]  ? generic_make_request+0xdf0/0xdf0
[   36.466109]  ? check_preemption_disabled+0x41/0x280
[   36.471116]  ? guard_bio_eod+0x2a0/0x650
[   36.475244]  submit_bh_wbc+0x5a7/0x760
[   36.479114]  __sync_dirty_buffer+0x14e/0x320
[   36.483502]  fat_set_state+0x22b/0x310
[   36.487366]  ? __sync_blockdev+0x7c/0xd0
[   36.491410]  fat_put_super+0x3b/0xc0
[   36.495101]  ? fat_statfs+0x4c0/0x4c0
[   36.498889]  generic_shutdown_super+0x144/0x370
[   36.503542]  kill_block_super+0x97/0xf0
[   36.507500]  deactivate_locked_super+0x94/0x160
[   36.512145]  deactivate_super+0x174/0x1a0
[   36.516273]  ? deactivate_locked_super+0x160/0x160
[   36.521182]  ? dput+0x31/0x640
[   36.524377]  cleanup_mnt+0x1a8/0x290
[   36.528072]  task_work_run+0x148/0x1c0
[   36.531953]  do_exit+0xbf3/0x2be0
[   36.535389]  ? lock_downgrade+0x720/0x720
[   36.539516]  ? mm_update_next_owner+0x650/0x650
[   36.544175]  ? up_read+0x17/0x110
[   36.547609]  ? __do_page_fault+0x180/0xd60
[   36.551826]  do_group_exit+0x125/0x310
[   36.555699]  __x64_sys_exit_group+0x3a/0x50
[   36.560001]  do_syscall_64+0xf9/0x620
[   36.563786]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   36.568956] RIP: 0033:0x7f2694916089
[   36.572653] Code: Bad RIP value.
[   36.575994] RSP: 002b:00007ffc55617e88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   36.583692] RAX: ffffffffffffffda RBX: 00007f269498a330 RCX: 00007f2694916089
[   36.591043] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
[   36.598302] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f2694984e40
[   36.605559] R10: 000000000000ffff R11: 0000000000000246 R12: 00007f269498a330
[   36.612809] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
[   36.620452] Kernel Offset: disabled
[   36.624107] Rebooting in 86400 seconds..