[ 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 '10.128.15.196' (ECDSA) to the list of known hosts. syzkaller login: [ 39.937956] IPVS: ftp: loaded support on port[0] = 21 [ 39.939985] IPVS: ftp: loaded support on port[0] = 21 [ 39.965646] IPVS: ftp: loaded support on port[0] = 21 [ 39.970034] IPVS: ftp: loaded support on port[0] = 21 [ 39.972631] IPVS: ftp: loaded support on port[0] = 21 [ 39.979894] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 58.975696] ------------[ cut here ]------------ [ 58.984111] generic_make_request: Trying to write to read-only block-device sda (partno 0) [ 59.003046] WARNING: CPU: 0 PID: 47 at block/blk-core.c:2182 generic_make_request_checks+0x17d9/0x22e0 [ 59.012750] Kernel panic - not syncing: panic_on_warn set ... [ 59.012750] [ 59.020119] CPU: 0 PID: 47 Comm: kworker/u4:2 Not tainted 4.19.167-syzkaller #0 [ 59.027683] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.037038] Workqueue: writeback wb_workfn (flush-8:0) [ 59.042314] Call Trace: [ 59.044908] dump_stack+0x1fc/0x2fe [ 59.048556] panic+0x26a/0x50e [ 59.051737] ? __warn_printk+0xf3/0xf3 [ 59.055621] ? generic_make_request_checks+0x17d9/0x22e0 [ 59.061054] ? __probe_kernel_read+0x130/0x1b0 [ 59.065652] ? __warn.cold+0x5/0x61 [ 59.069270] ? __warn+0xe4/0x200 [ 59.072620] ? generic_make_request_checks+0x17d9/0x22e0 [ 59.078059] __warn.cold+0x20/0x61 [ 59.081631] ? generic_make_request_checks+0x17d9/0x22e0 [ 59.087088] report_bug+0x262/0x2b0 [ 59.090699] do_error_trap+0x1d7/0x310 [ 59.094601] ? math_error+0x310/0x310 [ 59.098396] ? __irq_work_queue_local+0x101/0x160 [ 59.103225] ? irq_work_queue+0x29/0x80 [ 59.107272] ? error_entry+0x72/0xd0 [ 59.110993] ? trace_hardirqs_off_caller+0x6e/0x210 [ 59.115998] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.120857] invalid_op+0x14/0x20 [ 59.124310] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 59.130380] Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 d9 2b 06 00 48 c7 c7 00 06 b2 88 48 89 c6 44 89 f2 e8 d2 b7 ce fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 59.149269] RSP: 0018:ffff8880b517edc0 EFLAGS: 00010286 [ 59.154629] RAX: 0000000000000000 RBX: ffff8880ac281000 RCX: 0000000000000000 [ 59.161880] RDX: 0000000000000000 RSI: ffffffff814fde01 RDI: ffffed1016a2fdaa [ 59.169142] RBP: ffff8880aae89500 R08: 0000000000000001 R09: 0000000000000000 [ 59.176405] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aae89530 [ 59.183670] R13: ffff8880aae89508 R14: 0000000000000000 R15: 0000000000000000 [ 59.190936] ? vprintk_func+0x81/0x17e [ 59.194833] ? generic_make_request+0x1f3/0xdf0 [ 59.199491] ? should_fail_bio.isra.0+0xa0/0xa0 [ 59.204325] ? lock_downgrade+0x720/0x720 [ 59.208478] ? lock_acquire+0x170/0x3c0 [ 59.212439] ? generic_make_request+0x106/0xdf0 [ 59.217096] ? check_preemption_disabled+0x41/0x280 [ 59.222103] generic_make_request+0x23f/0xdf0 [ 59.226595] ? blk_put_request+0x110/0x110 [ 59.230837] ? bio_advance+0x2e7/0x450 [ 59.234720] ? check_preemption_disabled+0x41/0x280 [ 59.239741] blk_queue_split+0x83e/0x1700 [ 59.243890] ? blk_recount_segments+0x5f0/0x5f0 [ 59.248562] blk_mq_make_request+0x15d/0x1c00 [ 59.253066] ? blk_mq_try_issue_directly+0x180/0x180 [ 59.258154] ? should_fail_bio.isra.0+0xa0/0xa0 [ 59.262821] ? mark_held_locks+0xf0/0xf0 [ 59.266876] ? mark_held_locks+0xf0/0xf0 [ 59.270929] generic_make_request+0x613/0xdf0 [ 59.275416] ? mark_held_locks+0xa6/0xf0 [ 59.279483] ? blk_put_request+0x110/0x110 [ 59.283732] ? __unlock_page_memcg+0x4f/0x100 [ 59.288218] submit_bio+0xb1/0x430 [ 59.291756] ? generic_make_request+0xdf0/0xdf0 [ 59.297281] ? __bio_try_merge_page+0x106/0x220 [ 59.302031] ? bio_add_page+0xc9/0x120 [ 59.305914] ext4_bio_write_page+0xa5e/0x16bd [ 59.310414] mpage_submit_page+0x14b/0x250 [ 59.314898] ext4_writepages+0x20fc/0x37f0 [ 59.319144] ? ext4_mark_inode_dirty+0x870/0x870 [ 59.323892] ? __lock_acquire+0x6de/0x3ff0 [ 59.328118] ? mark_held_locks+0xf0/0xf0 [ 59.332162] ? __lock_acquire+0x6de/0x3ff0 [ 59.336400] ? __ext4_get_inode_loc+0x3c3/0x10f0 [ 59.341148] ? mark_held_locks+0xf0/0xf0 [ 59.345304] ? ext4_mark_inode_dirty+0x870/0x870 [ 59.350073] do_writepages+0xe5/0x290 [ 59.353861] ? page_writeback_cpu_online+0x10/0x10 [ 59.358792] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 59.364051] ? check_preemption_disabled+0x41/0x280 [ 59.369053] __writeback_single_inode+0x113/0x1340 [ 59.373966] ? _raw_spin_unlock+0x29/0x40 [ 59.378113] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 59.383479] writeback_sb_inodes+0x537/0xef0 [ 59.387878] ? wbc_detach_inode+0x840/0x840 [ 59.392198] ? down_read_trylock+0x4e/0x90 [ 59.396424] ? trylock_super+0x1d/0x100 [ 59.400394] __writeback_inodes_wb+0xc6/0x280 [ 59.404879] wb_writeback+0x841/0xcc0 [ 59.408669] ? writeback_inodes_wb.constprop.0+0x1d0/0x1d0 [ 59.414286] ? cpumask_next+0x3c/0x40 [ 59.418070] ? get_nr_dirty_inodes+0x19e/0x210 [ 59.422645] wb_workfn+0x90f/0x12f0 [ 59.426256] ? inode_wait_for_writeback+0x30/0x30 [ 59.431085] process_one_work+0x864/0x1570 [ 59.435306] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 59.440008] worker_thread+0x64c/0x1130 [ 59.443979] ? process_one_work+0x1570/0x1570 [ 59.448464] kthread+0x33f/0x460 [ 59.451827] ? kthread_park+0x180/0x180 [ 59.455786] ret_from_fork+0x24/0x30 [ 59.460515] Kernel Offset: disabled [ 59.464189] Rebooting in 86400 seconds..