[ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. [ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.237' (ECDSA) to the list of known hosts. syzkaller login: [ 34.241649] IPVS: ftp: loaded support on port[0] = 21 executing program [ 34.416325] ------------[ cut here ]------------ [ 34.421132] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 34.434526] WARNING: CPU: 1 PID: 8142 at block/blk-core.c:2183 generic_make_request_checks+0x17d9/0x22e0 [ 34.444317] Kernel panic - not syncing: panic_on_warn set ... [ 34.444317] [ 34.451704] CPU: 1 PID: 8142 Comm: syz-executor073 Not tainted 4.19.192-syzkaller #0 [ 34.459575] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.469104] Call Trace: [ 34.471694] dump_stack+0x1fc/0x2ef [ 34.475316] panic+0x26a/0x50e [ 34.478595] ? __warn_printk+0xf3/0xf3 [ 34.482496] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.487934] ? __probe_kernel_read+0x130/0x1b0 [ 34.492501] ? __warn.cold+0x5/0x5a [ 34.496129] ? __warn+0xe4/0x200 [ 34.499504] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.504953] __warn.cold+0x20/0x5a [ 34.508488] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.513952] report_bug+0x262/0x2b0 [ 34.517575] do_error_trap+0x1d7/0x310 [ 34.521453] ? math_error+0x310/0x310 [ 34.525248] ? __irq_work_queue_local+0x101/0x160 [ 34.530181] ? irq_work_queue+0x29/0x80 [ 34.534231] ? error_entry+0x72/0xd0 [ 34.538019] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.543021] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.547852] invalid_op+0x14/0x20 [ 34.551294] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 34.557428] Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 b9 14 06 00 48 c7 c7 00 23 b2 88 48 89 c6 44 89 f2 e8 87 97 90 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 34.576588] RSP: 0018:ffff888094caf0b0 EFLAGS: 00010286 [ 34.581945] RAX: 0000000000000000 RBX: ffff8880aeed1040 RCX: 0000000000000000 [ 34.589285] RDX: 0000000000000000 RSI: ffffffff814df6b1 RDI: ffffed1012995e08 [ 34.596647] RBP: ffff8880aa966540 R08: 0000000000000001 R09: 0000000000000000 [ 34.603999] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aa966570 [ 34.611253] R13: ffff8880aa966548 R14: 0000000000000000 R15: 0000000000000000 [ 34.618520] ? vprintk_func+0x81/0x180 [ 34.622402] ? should_fail_bio.isra.0+0xa0/0xa0 [ 34.627058] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 34.632074] ? kmem_cache_alloc+0x315/0x370 [ 34.636395] generic_make_request+0x23f/0xdf0 [ 34.640898] ? blk_put_request+0x110/0x110 [ 34.645137] ? sb_mark_inode_writeback+0xc8/0x490 [ 34.650067] submit_bio+0xb1/0x430 [ 34.653697] ? generic_make_request+0xdf0/0xdf0 [ 34.658444] ? check_preemption_disabled+0x41/0x280 [ 34.663451] ? guard_bio_eod+0x2a0/0x650 [ 34.667509] submit_bh_wbc+0x5a7/0x760 [ 34.671385] __block_write_full_page+0x71a/0xf60 [ 34.676240] ? block_llseek+0xc0/0xc0 [ 34.680028] block_write_full_page+0x1f3/0x260 [ 34.684595] ? block_llseek+0xc0/0xc0 [ 34.688391] __writepage+0x5e/0xe0 [ 34.691919] write_cache_pages+0x802/0x12d0 [ 34.696329] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 34.701246] ? clear_page_dirty_for_io+0xee0/0xee0 [ 34.706163] ? deref_stack_reg+0x134/0x1d0 [ 34.710380] ? get_reg+0x176/0x1f0 [ 34.713910] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 34.719878] ? deref_stack_reg+0x1d0/0x1d0 [ 34.724116] ? __lock_acquire+0x6de/0x3ff0 [ 34.728352] ? blkdev_readpages+0x30/0x30 [ 34.732486] generic_writepages+0xdb/0x150 [ 34.736704] ? dirty_poll_interval.part.0+0x30/0x30 [ 34.741721] ? mark_held_locks+0xf0/0xf0 [ 34.745779] do_writepages+0xe5/0x290 [ 34.749662] ? page_writeback_cpu_online+0x10/0x10 [ 34.754597] ? do_raw_spin_unlock+0x171/0x230 [ 34.759213] ? _raw_spin_unlock+0x29/0x40 [ 34.763353] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 34.768621] __filemap_fdatawrite_range+0x27d/0x350 [ 34.773623] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 34.778977] ? lock_downgrade+0x720/0x720 [ 34.783106] ? locks_remove_file+0x2c8/0x450 [ 34.787503] ? blkdev_put+0x30/0x520 [ 34.791201] ? blkdev_put+0x520/0x520 [ 34.795001] filemap_write_and_wait+0x42/0xd0 [ 34.799482] __blkdev_put+0x682/0x870 [ 34.803292] ? fsync_bdev+0xc0/0xc0 [ 34.807001] ? locks_remove_file+0x2cd/0x450 [ 34.811397] ? blkdev_put+0x85/0x520 [ 34.815107] ? blkdev_put+0x520/0x520 [ 34.818890] blkdev_close+0x86/0xb0 [ 34.822506] __fput+0x2ce/0x890 [ 34.825778] task_work_run+0x148/0x1c0 [ 34.829670] do_exit+0xbf3/0x2be0 [ 34.833120] ? futex_wake+0x159/0x480 [ 34.836907] ? mm_update_next_owner+0x650/0x650 [ 34.841560] ? get_signal+0x388/0x1f70 [ 34.845460] ? lock_downgrade+0x720/0x720 [ 34.849692] ? lock_acquire+0x170/0x3c0 [ 34.853651] do_group_exit+0x125/0x310 [ 34.857523] get_signal+0x3f2/0x1f70 [ 34.861309] ? lock_downgrade+0x720/0x720 [ 34.865447] do_signal+0x8f/0x1670 [ 34.868973] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 34.874072] ? debug_object_active_state+0x254/0x330 [ 34.879367] ? setup_sigcontext+0x820/0x820 [ 34.883672] ? debug_object_init_on_stack+0x20/0x20 [ 34.888680] ? kfree+0x110/0x210 [ 34.892033] ? task_work_run+0x11c/0x1c0 [ 34.896081] ? blkcg_maybe_throttle_current+0x56c/0xc10 [ 34.901451] ? __se_sys_futex+0x28f/0x3b0 [ 34.905617] ? __se_sys_futex+0x298/0x3b0 [ 34.909747] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 34.914322] ? do_futex+0x1880/0x1880 [ 34.918121] ? task_work_run+0x126/0x1c0 [ 34.922169] ? exit_to_usermode_loop+0x36/0x2a0 [ 34.926835] exit_to_usermode_loop+0x204/0x2a0 [ 34.931404] do_syscall_64+0x538/0x620 [ 34.935396] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.940567] RIP: 0033:0x4529c9 [ 34.943766] Code: Bad RIP value. [ 34.947113] RSP: 002b:00007f06171cd218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 34.954991] RAX: fffffffffffffe00 RBX: 00000000004cc418 RCX: 00000000004529c9 [ 34.962270] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cc418 [ 34.969545] RBP: 00000000004cc410 R08: 0000000000000000 R09: 0000000000000000 [ 34.976886] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cc41c [ 34.984155] R13: 00007ffd7b7d92ff R14: 00007f06171cd300 R15: 0000000000022000 [ 34.992456] Kernel Offset: disabled [ 34.996127] Rebooting in 86400 seconds..