Warning: Permanently added '10.128.1.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.294612] audit: type=1400 audit(1594110757.690:8): avc: denied { execmem } for pid=6439 comm="syz-executor358" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.301053] ------------[ cut here ]------------ [ 39.320204] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 39.329159] WARNING: CPU: 0 PID: 6439 at block/blk-core.c:2180 generic_make_request_checks+0x17d9/0x22e0 [ 39.338762] Kernel panic - not syncing: panic_on_warn set ... [ 39.338762] [ 39.346108] CPU: 0 PID: 6439 Comm: syz-executor358 Not tainted 4.19.131-syzkaller #0 [ 39.353965] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.363293] Call Trace: [ 39.365864] dump_stack+0x1fc/0x2fe [ 39.369481] panic+0x26a/0x50e [ 39.372650] ? __warn_printk+0xf3/0xf3 [ 39.376519] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.381950] ? __probe_kernel_read+0x16c/0x1b0 [ 39.386518] ? __warn.cold+0x5/0x61 [ 39.390121] ? __warn+0xe4/0x200 [ 39.393475] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.398902] __warn.cold+0x20/0x61 [ 39.402430] ? generic_make_request_checks+0x17d9/0x22e0 [ 39.407870] report_bug+0x262/0x2b0 [ 39.411481] do_error_trap+0x1d7/0x310 [ 39.415353] ? math_error+0x310/0x310 [ 39.419133] ? __irq_work_queue_local+0x101/0x160 [ 39.423962] ? irq_work_queue+0x29/0x80 [ 39.427947] ? wake_up_klogd+0x8c/0xc0 [ 39.431831] ? vprintk_emit+0x1d0/0x730 [ 39.435788] ? trace_hardirqs_off_caller+0x69/0x210 [ 39.440784] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.445656] invalid_op+0x14/0x20 [ 39.449090] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 39.455128] 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 54 c9 87 48 89 c6 44 89 f2 e8 a2 83 f3 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 39.474021] RSP: 0018:ffff8880999df360 EFLAGS: 00010282 [ 39.479411] RAX: 0000000000000000 RBX: ffff8880a2c0e000 RCX: 0000000000000000 [ 39.486669] RDX: 0000000000000000 RSI: ffffffff8154cd91 RDI: ffffed101333be5e [ 39.493928] RBP: ffff88809f858200 R08: 0000000000000001 R09: 0000000000000000 [ 39.501174] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809f858230 [ 39.508418] R13: ffff88809f858208 R14: 0000000000000000 R15: 0000000000000000 [ 39.515677] ? vprintk_func+0x81/0x17e [ 39.519549] ? should_fail_bio.isra.0+0xa0/0xa0 [ 39.524197] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 39.529191] ? kmem_cache_alloc+0x315/0x370 [ 39.533492] generic_make_request+0x23f/0xdf0 [ 39.537975] ? blk_put_request+0x110/0x110 [ 39.542195] ? sb_mark_inode_writeback+0xc8/0x490 [ 39.547019] submit_bio+0xb1/0x430 [ 39.550535] ? generic_make_request+0xdf0/0xdf0 [ 39.555180] ? check_preemption_disabled+0x41/0x280 [ 39.560173] ? guard_bio_eod+0x2a0/0x640 [ 39.564210] submit_bh_wbc+0x5a7/0x760 [ 39.568086] __block_write_full_page+0x71a/0xf60 [ 39.572833] ? block_llseek+0xc0/0xc0 [ 39.576612] block_write_full_page+0x202/0x270 [ 39.581187] ? block_llseek+0xc0/0xc0 [ 39.584968] __writepage+0x5e/0xe0 [ 39.588486] write_cache_pages+0x802/0x12d0 [ 39.592786] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 39.597700] ? clear_page_dirty_for_io+0xee0/0xee0 [ 39.602608] ? __lock_acquire+0x6de/0x3ff0 [ 39.606822] ? __lock_acquire+0x6de/0x3ff0 [ 39.611035] ? blkdev_readpages+0x30/0x30 [ 39.615157] generic_writepages+0xdb/0x150 [ 39.619370] ? dirty_poll_interval.part.0+0x30/0x30 [ 39.624370] ? mark_held_locks+0xf0/0xf0 [ 39.628415] do_writepages+0xe5/0x290 [ 39.632195] ? page_writeback_cpu_online+0x10/0x10 [ 39.637104] ? do_raw_spin_unlock+0x171/0x230 [ 39.641590] ? _raw_spin_unlock+0x29/0x40 [ 39.645715] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 39.650971] __filemap_fdatawrite_range+0x27d/0x350 [ 39.655966] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 39.661312] ? lock_downgrade+0x720/0x720 [ 39.665437] ? locks_remove_file+0x2c8/0x450 [ 39.669833] ? blkdev_put+0x30/0x520 [ 39.673536] filemap_write_and_wait+0x42/0xd0 [ 39.678007] __blkdev_put+0x1bb/0x7b0 [ 39.681799] ? fsync_bdev+0xc0/0xc0 [ 39.685413] ? locks_remove_file+0x2cd/0x450 [ 39.689799] ? blkdev_put+0x85/0x520 [ 39.693501] ? blkdev_put+0x520/0x520 [ 39.697278] blkdev_close+0x86/0xb0 [ 39.700895] __fput+0x2ce/0x890 [ 39.704154] task_work_run+0x148/0x1c0 [ 39.708022] do_exit+0xbb2/0x2b70 [ 39.711454] ? lock_downgrade+0x720/0x720 [ 39.715579] ? mm_update_next_owner+0x650/0x650 [ 39.720231] do_group_exit+0x125/0x310 [ 39.724096] __x64_sys_exit_group+0x3a/0x50 [ 39.728397] do_syscall_64+0xf9/0x620 [ 39.732176] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.737347] RIP: 0033:0x43eec8 [ 39.740536] Code: Bad RIP value. [ 39.743873] RSP: 002b:00007fffcdf0bdd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 39.751566] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eec8 [ 39.758812] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 39.766069] RBP: 00000000004be6c8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 39.773314] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 39.780559] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 39.788890] Kernel Offset: disabled [ 39.792541] Rebooting in 86400 seconds..