[ 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 '10.128.1.17' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 52.505206] audit: type=1400 audit(1597666682.460:8): avc: denied { execmem } for pid=6460 comm="syz-executor983" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 52.542162] ------------[ cut here ]------------ [ 52.547209] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 52.557011] WARNING: CPU: 0 PID: 6470 at block/blk-core.c:2180 generic_make_request_checks+0x17d9/0x22e0 [ 52.566627] Kernel panic - not syncing: panic_on_warn set ... [ 52.566627] [ 52.573973] CPU: 0 PID: 6470 Comm: syz-executor983 Not tainted 4.19.139-syzkaller #0 [ 52.581829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.591158] Call Trace: [ 52.593733] dump_stack+0x1fc/0x2fe [ 52.597340] panic+0x26a/0x50e [ 52.600509] ? __warn_printk+0xf3/0xf3 [ 52.604380] ? generic_make_request_checks+0x17d9/0x22e0 [ 52.609809] ? __probe_kernel_read+0x16c/0x1b0 [ 52.614368] ? __warn.cold+0x5/0x61 [ 52.617972] ? __warn+0xe4/0x200 [ 52.621316] ? generic_make_request_checks+0x17d9/0x22e0 [ 52.626743] __warn.cold+0x20/0x61 [ 52.630262] ? io_schedule_timeout+0x140/0x140 [ 52.634824] ? generic_make_request_checks+0x17d9/0x22e0 [ 52.640253] report_bug+0x262/0x2b0 [ 52.643879] do_error_trap+0x1d7/0x310 [ 52.647745] ? math_error+0x310/0x310 [ 52.651525] ? __irq_work_queue_local+0x101/0x160 [ 52.656345] ? irq_work_queue+0x29/0x80 [ 52.660295] ? wake_up_klogd.part.0+0x8c/0xc0 [ 52.664770] ? trace_hardirqs_off_caller+0x69/0x210 [ 52.669769] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.674595] invalid_op+0x14/0x20 [ 52.678028] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 52.684064] Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 99 41 06 00 48 c7 c7 00 56 c9 87 48 89 c6 44 89 f2 e8 62 66 f3 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 52.702947] RSP: 0018:ffff8880897e70a8 EFLAGS: 00010286 [ 52.708299] RAX: 0000000000000000 RBX: ffff8880a3f4b000 RCX: 0000000000000000 [ 52.715553] RDX: 0000000000000000 RSI: ffffffff8154cf41 RDI: ffffed10112fce07 [ 52.722821] RBP: ffff88808f1b3780 R08: 0000000000000001 R09: 0000000000000000 [ 52.730068] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808f1b37b0 [ 52.737316] R13: ffff88808f1b3788 R14: 0000000000000000 R15: 0000000000000000 [ 52.744576] ? vprintk_func+0x81/0x17e [ 52.748461] ? generic_make_request_checks+0x17d9/0x22e0 [ 52.753904] ? should_fail_bio.isra.0+0xa0/0xa0 [ 52.758568] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 52.763564] ? kmem_cache_alloc+0x315/0x370 [ 52.767866] generic_make_request+0x23f/0xdf0 [ 52.772341] ? blk_put_request+0x110/0x110 [ 52.776560] ? sb_mark_inode_writeback+0xc8/0x490 [ 52.781473] submit_bio+0xb1/0x430 [ 52.784992] ? generic_make_request+0xdf0/0xdf0 [ 52.789638] ? check_preemption_disabled+0x41/0x280 [ 52.794635] ? guard_bio_eod+0x2a0/0x640 [ 52.798674] submit_bh_wbc+0x5a7/0x760 [ 52.802547] __block_write_full_page+0x71a/0xf60 [ 52.807284] ? block_llseek+0xc0/0xc0 [ 52.811064] block_write_full_page+0x202/0x270 [ 52.815623] ? block_llseek+0xc0/0xc0 [ 52.819406] __writepage+0x5e/0xe0 [ 52.822937] write_cache_pages+0x802/0x12d0 [ 52.827248] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 52.832158] ? clear_page_dirty_for_io+0xee0/0xee0 [ 52.837077] ? blkdev_readpages+0x30/0x30 [ 52.841204] generic_writepages+0xdb/0x150 [ 52.845429] ? dirty_poll_interval.part.0+0x30/0x30 [ 52.850423] ? mark_held_locks+0xf0/0xf0 [ 52.854476] do_writepages+0xe5/0x290 [ 52.858294] ? page_writeback_cpu_online+0x10/0x10 [ 52.863213] ? do_raw_spin_unlock+0x171/0x230 [ 52.867813] ? _raw_spin_unlock+0x29/0x40 [ 52.871949] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 52.877211] __filemap_fdatawrite_range+0x27d/0x350 [ 52.882209] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 52.887557] ? lock_downgrade+0x720/0x720 [ 52.891687] ? locks_remove_file+0x2c8/0x450 [ 52.896081] ? blkdev_put+0x30/0x520 [ 52.899776] filemap_write_and_wait+0x42/0xd0 [ 52.904337] __blkdev_put+0x1bb/0x7b0 [ 52.908121] ? fsync_bdev+0xc0/0xc0 [ 52.911728] ? blkdev_put+0x85/0x520 [ 52.915423] ? blkdev_put+0x520/0x520 [ 52.919203] blkdev_close+0x86/0xb0 [ 52.922819] __fput+0x2ce/0x890 [ 52.926081] task_work_run+0x148/0x1c0 [ 52.929949] do_exit+0xbb2/0x2b70 [ 52.933382] ? futex_wake+0x159/0x480 [ 52.937171] ? mm_update_next_owner+0x650/0x650 [ 52.941838] ? get_signal+0x388/0x1f70 [ 52.945802] ? lock_downgrade+0x720/0x720 [ 52.949927] ? lock_acquire+0x170/0x3c0 [ 52.953892] do_group_exit+0x125/0x310 [ 52.957770] get_signal+0x3f2/0x1f70 [ 52.961469] ? splice_direct_to_actor+0x8d0/0x8d0 [ 52.966292] do_signal+0x8f/0x1670 [ 52.969812] ? fput+0x2b/0x190 [ 52.972987] ? setup_sigcontext+0x820/0x820 [ 52.977292] ? do_compat_pwritev64+0x1b0/0x1b0 [ 52.981867] ? __se_sys_futex+0x28f/0x3b0 [ 52.986001] ? __se_sys_futex+0x298/0x3b0 [ 52.990136] ? do_futex+0x1c40/0x1c40 [ 52.993921] ? __se_sys_sendfile64+0xfb/0x160 [ 52.998401] ? exit_to_usermode_loop+0x36/0x2a0 [ 53.003066] exit_to_usermode_loop+0x204/0x2a0 [ 53.007647] do_syscall_64+0x538/0x620 [ 53.011530] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.016699] RIP: 0033:0x44a539 [ 53.019880] Code: Bad RIP value. [ 53.023238] RSP: 002b:00007fd3e969ed98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 53.030921] RAX: 0000000000000001 RBX: 00000000006dbc38 RCX: 000000000044a539 [ 53.038226] RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000006dbc3c [ 53.045476] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 53.052725] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 53.059971] R13: 0000000020000180 R14: 00000000004ae8d8 R15: 0000000000000032 [ 53.068691] Kernel Offset: disabled [ 53.072356] Rebooting in 86400 seconds..