Warning: Permanently added '10.128.1.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.642344] audit: type=1400 audit(1598143934.276:8): avc: denied { execmem } for pid=6440 comm="syz-executor585" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.666724] ------------[ cut here ]------------ [ 39.671525] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 39.681085] WARNING: CPU: 0 PID: 6444 at block/blk-core.c:2180 generic_make_request_checks+0x17d9/0x22e0 [ 39.690737] Kernel panic - not syncing: panic_on_warn set ... [ 39.690737] [ 39.698081] CPU: 0 PID: 6444 Comm: syz-executor585 Not tainted 4.19.141-syzkaller #0 [ 39.705938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.715265] Call Trace: [ 39.717861] dump_stack+0x1fc/0x2fe [ 39.721469] panic+0x26a/0x50e [ 39.724650] ? __warn_printk+0xf3/0xf3 [ 39.728522] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.733953] ? __probe_kernel_read+0x16c/0x1b0 [ 39.738508] ? __warn.cold+0x5/0x61 [ 39.742111] ? __warn+0xe4/0x200 [ 39.745475] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.750911] __warn.cold+0x20/0x61 [ 39.754430] ? io_schedule_timeout+0x140/0x140 [ 39.758988] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.764418] report_bug+0x262/0x2b0 [ 39.768032] do_error_trap+0x1d7/0x310 [ 39.771898] ? math_error+0x310/0x310 [ 39.775680] ? __irq_work_queue_local+0x101/0x160 [ 39.780500] ? irq_work_queue+0x29/0x80 [ 39.784456] ? wake_up_klogd.part.0+0x8c/0xc0 [ 39.788928] ? trace_hardirqs_off_caller+0x69/0x210 [ 39.793923] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.798745] invalid_op+0x14/0x20 [ 39.802185] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 39.808223] 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 40 5b c9 87 48 89 c6 44 89 f2 e8 02 5e f3 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 39.827110] RSP: 0018:ffff88808490f0a8 EFLAGS: 00010286 [ 39.832451] RAX: 0000000000000000 RBX: ffff8880a35e4000 RCX: 0000000000000000 [ 39.839697] RDX: 0000000000000000 RSI: ffffffff8154cf81 RDI: ffffed1010921e07 [ 39.846943] RBP: ffff888090876640 R08: 0000000000000001 R09: 0000000000000000 [ 39.854191] R10: 0000000000000005 R11: 0000000000000000 R12: ffff888090876670 [ 39.861439] R13: ffff888090876648 R14: 0000000000000000 R15: 0000000000000000 [ 39.868710] ? vprintk_func+0x81/0x17e [ 39.872582] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.878069] ? should_fail_bio.isra.0+0xa0/0xa0 [ 39.882722] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 39.887729] ? kmem_cache_alloc+0x315/0x370 [ 39.892052] generic_make_request+0x23f/0xdf0 [ 39.896542] ? blk_put_request+0x110/0x110 [ 39.900758] ? sb_mark_inode_writeback+0xc8/0x490 [ 39.905583] submit_bio+0xb1/0x430 [ 39.909102] ? generic_make_request+0xdf0/0xdf0 [ 39.913748] ? check_preemption_disabled+0x41/0x280 [ 39.918743] ? guard_bio_eod+0x2a0/0x640 [ 39.922780] submit_bh_wbc+0x5a7/0x760 [ 39.926662] __block_write_full_page+0x71a/0xf60 [ 39.931401] ? block_llseek+0xc0/0xc0 [ 39.935182] block_write_full_page+0x202/0x270 [ 39.939739] ? block_llseek+0xc0/0xc0 [ 39.943520] __writepage+0x5e/0xe0 [ 39.947040] write_cache_pages+0x802/0x12d0 [ 39.951342] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 39.956253] ? clear_page_dirty_for_io+0xee0/0xee0 [ 39.961163] ? __lock_acquire+0x6de/0x3ff0 [ 39.965379] ? __lock_acquire+0x6de/0x3ff0 [ 39.969609] ? blkdev_readpages+0x30/0x30 [ 39.973751] generic_writepages+0xdb/0x150 [ 39.977965] ? dirty_poll_interval.part.0+0x30/0x30 [ 39.982959] ? mark_held_locks+0xf0/0xf0 [ 39.987005] do_writepages+0xe5/0x290 [ 39.990783] ? page_writeback_cpu_online+0x10/0x10 [ 39.995692] ? do_raw_spin_unlock+0x171/0x230 [ 40.000244] ? _raw_spin_unlock+0x29/0x40 [ 40.004379] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 40.009640] __filemap_fdatawrite_range+0x27d/0x350 [ 40.014659] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 40.020147] ? lock_downgrade+0x720/0x720 [ 40.024279] ? locks_remove_file+0x2c8/0x450 [ 40.028669] ? blkdev_put+0x30/0x520 [ 40.032376] filemap_write_and_wait+0x42/0xd0 [ 40.036852] __blkdev_put+0x1bb/0x7b0 [ 40.040633] ? fsync_bdev+0xc0/0xc0 [ 40.044239] ? locks_remove_file+0x2cd/0x450 [ 40.048628] ? blkdev_put+0x85/0x520 [ 40.052332] ? blkdev_put+0x520/0x520 [ 40.056112] blkdev_close+0x86/0xb0 [ 40.059735] __fput+0x2ce/0x890 [ 40.063009] task_work_run+0x148/0x1c0 [ 40.066887] do_exit+0xbb2/0x2b70 [ 40.070324] ? futex_wake+0x159/0x480 [ 40.074119] ? mm_update_next_owner+0x650/0x650 [ 40.078781] ? get_signal+0x388/0x1f70 [ 40.082666] ? lock_downgrade+0x720/0x720 [ 40.086796] ? lock_acquire+0x170/0x3c0 [ 40.090752] do_group_exit+0x125/0x310 [ 40.094625] get_signal+0x3f2/0x1f70 [ 40.098325] do_signal+0x8f/0x1670 [ 40.101857] ? setup_sigcontext+0x820/0x820 [ 40.106158] ? vm_mmap_pgoff+0x1c0/0x200 [ 40.110196] ? vm_mmap_pgoff+0xe8/0x200 [ 40.114158] ? vma_is_stack_for_current+0xc0/0xc0 [ 40.118982] ? do_dup2+0x450/0x450 [ 40.122502] ? __se_sys_futex+0x28f/0x3b0 [ 40.126641] ? __se_sys_futex+0x298/0x3b0 [ 40.130778] ? do_futex+0x1c40/0x1c40 [ 40.134576] ? exit_to_usermode_loop+0x36/0x2a0 [ 40.139231] exit_to_usermode_loop+0x204/0x2a0 [ 40.143808] do_syscall_64+0x538/0x620 [ 40.147680] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.152847] RIP: 0033:0x445949 [ 40.156038] Code: Bad RIP value. [ 40.159380] RSP: 002b:00007f8fd918cdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 40.167076] RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445949 [ 40.174335] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38 [ 40.181592] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 40.188839] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 40.196091] R13: 00007fff9f3aa09f R14: 00007f8fd918d9c0 R15: 20c49ba5e353f7cf [ 40.204611] Kernel Offset: disabled [ 40.208279] Rebooting in 86400 seconds..