executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 46.497888] [ 46.498224] ====================================================== [ 46.499138] WARNING: possible circular locking dependency detected [ 46.500036] 4.13.0-rc6-next-20170823+ #7 Not tainted [ 46.500735] ------------------------------------------------------ [ 46.501637] udevd/1525 is trying to acquire lock: [ 46.502342] ((complete)wq_barr::done#2/1){+.+.}, at: [] flush_work+0x621/0x930 [ 46.503628] [ 46.503628] but task is already holding lock: [ 46.504467] (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7d/0xb0 [ 46.508297] [ 46.508297] which lock already depends on the new lock. [ 46.508297] [ 46.509532] [ 46.509532] the existing dependency chain (in reverse order) is: [ 46.510740] [ 46.510740] -> #8 (&ei->i_mmap_sem){++++}: [ 46.511637] __lock_acquire+0x3286/0x4620 [ 46.512346] lock_acquire+0x1d5/0x580 [ 46.513015] down_read+0x96/0x150 [ 46.513590] ext4_filemap_fault+0x7d/0xb0 [ 46.514396] __do_fault+0xeb/0x30f [ 46.514981] __handle_mm_fault+0x162c/0x39e0 [ 46.515711] handle_mm_fault+0x3bb/0x860 [ 46.516403] __do_page_fault+0x4f6/0xb60 [ 46.517054] trace_do_page_fault+0x141/0x730 [ 46.517752] do_async_page_fault+0x72/0xc0 [ 46.518560] async_page_fault+0x22/0x30 [ 46.519268] __clear_user+0x42/0x70 [ 46.519973] clear_user+0x79/0xa0 [ 46.520368] load_elf_binary+0x28d5/0x4c10 [ 46.520802] search_binary_handler+0x142/0x6b0 [ 46.521355] do_execveat_common.isra.33+0x1746/0x22e0 [ 46.522028] do_execve+0x31/0x40 [ 46.522432] run_init_process+0x32/0x40 [ 46.522885] try_to_run_init_process+0x17/0x50 [ 46.523461] kernel_init+0xf3/0x172 [ 46.523888] ret_from_fork+0x2a/0x40 [ 46.524344] [ 46.524344] -> #7 (&mm->mmap_sem){++++}: [ 46.524903] __lock_acquire+0x3286/0x4620 [ 46.525420] lock_acquire+0x1d5/0x580 [ 46.525836] __might_fault+0x13a/0x1d0 [ 46.526455] _copy_to_user+0x2c/0xc0 [ 46.526861] filldir+0x1a7/0x320 [ 46.529859] dcache_readdir+0x12d/0x5e0 [ 46.530820] iterate_dir+0x4b2/0x5d0 [ 46.533718] SyS_getdents+0x225/0x450 [ 46.541797] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.542348] [ 46.542348] -> #6 (&sb->s_type->i_mutex_key#5){++++}: [ 46.544143] down_write+0x87/0x120 [ 46.545027] handle_create+0x30c/0x760 [ 46.546089] devtmpfsd+0x3eb/0x520 [ 46.546976] kthread+0x39c/0x470 [ 46.547326] ret_from_fork+0x2a/0x40 [ 46.548192] [ 46.548192] -> #5 ((complete)&req.done){+.+.}: [ 46.551709] __lock_acquire+0x3286/0x4620 [ 46.552657] lock_acquire+0x1d5/0x580 [ 46.557172] wait_for_completion+0xc8/0x770 [ 46.559408] devtmpfs_create_node+0x32b/0x4a0 [ 46.559838] device_add+0x120f/0x1640 [ 46.560175] device_create_groups_vargs+0x1f3/0x250 [ 46.561799] device_create+0xda/0x110 [ 46.562438] msr_device_create+0x26/0x40 [ 46.562896] cpuhp_invoke_callback+0x256/0x14d0 [ 46.563316] cpuhp_thread_fun+0x265/0x520 [ 46.565507] smpboot_thread_fn+0x489/0x850 [ 46.566241] kthread+0x39c/0x470 [ 46.566827] ret_from_fork+0x2a/0x40 [ 46.567470] [ 46.567470] -> #4 (cpuhp_state){+.+.}: [ 46.568342] __lock_acquire+0x3286/0x4620 [ 46.569211] lock_acquire+0x1d5/0x580 [ 46.574506] cpuhp_issue_call+0x1a2/0x3e0 [ 46.574883] __cpuhp_setup_state_cpuslocked+0x2e7/0x610 [ 46.576524] __cpuhp_setup_state+0xb0/0x140 [ 46.577488] page_writeback_init+0x4d/0x71 [ 46.578641] pagecache_init+0x48/0x4f [ 46.579290] start_kernel+0x715/0x7a8 [ 46.579908] x86_64_start_reservations+0x2a/0x2c [ 46.580701] x86_64_start_kernel+0x13c/0x149 [ 46.581438] verify_cpu+0x0/0xfb [ 46.581971] [ 46.581971] -> #3 (cpuhp_state_mutex){+.+.}: [ 46.582849] __lock_acquire+0x3286/0x4620 [ 46.583511] lock_acquire+0x1d5/0x580 [ 46.584093] __mutex_lock+0x16f/0x1870 [ 46.584607] mutex_lock_nested+0x16/0x20 [ 46.585477] __cpuhp_setup_state_cpuslocked+0x5b/0x610 [ 46.586162] __cpuhp_setup_state+0xb0/0x140 [ 46.586800] kvm_guest_init+0x1f3/0x20f [ 46.587369] setup_arch+0x1899/0x1ab3 [ 46.588033] start_kernel+0xa5/0x7a8 [ 46.588755] x86_64_start_reservations+0x2a/0x2c [ 46.589705] x86_64_start_kernel+0x13c/0x149 [ 46.590583] verify_cpu+0x0/0xfb [ 46.593036] [ 46.593036] -> #2 (cpu_hotplug_lock.rw_sem){++++}: [ 46.594374] __lock_acquire+0x3286/0x4620 [ 46.595282] lock_acquire+0x1d5/0x580 [ 46.596064] cpus_read_lock+0x42/0x90 [ 46.596789] vmstat_shepherd+0x3d/0x1b0 [ 46.597879] process_one_work+0xbfd/0x1be0 [ 46.598750] worker_thread+0x223/0x1860 [ 46.599534] kthread+0x39c/0x470 [ 46.600207] ret_from_fork+0x2a/0x40 [ 46.600947] [ 46.600947] -> #1 ((shepherd).work){+.+.}: [ 46.602012] process_one_work+0xba5/0x1be0 [ 46.602769] worker_thread+0x223/0x1860 [ 46.603474] kthread+0x39c/0x470 [ 46.604071] ret_from_fork+0x2a/0x40 [ 46.604807] 0xffffffffffffffff [ 46.605388] [ 46.605388] -> #0 ((complete)wq_barr::done#2/1){+.+.}: [ 46.606492] check_prev_add+0x865/0x1520 [ 46.607304] __lock_acquire+0x3286/0x4620 [ 46.608069] lock_acquire+0x1d5/0x580 [ 46.608760] wait_for_completion+0xc8/0x770 [ 46.615633] flush_work+0x621/0x930 [ 46.616451] drain_all_pages+0x490/0x750 [ 46.617345] __alloc_pages_slowpath+0xd2e/0x2ee0 [ 46.618415] __alloc_pages_nodemask+0x9f7/0xd80 [ 46.619427] alloc_pages_current+0xb6/0x1e0 [ 46.621410] __page_cache_alloc+0x358/0x4d0 [ 46.622363] __do_page_cache_readahead+0x2ec/0xc00 [ 46.623406] filemap_fault+0xb1a/0x1d30 [ 46.624250] ext4_filemap_fault+0x85/0xb0 [ 46.625124] __do_fault+0xeb/0x30f [ 46.625837] __handle_mm_fault+0x1b98/0x39e0 [ 46.626769] handle_mm_fault+0x3bb/0x860 [ 46.627714] __do_page_fault+0x4f6/0xb60 [ 46.628555] trace_do_page_fault+0x141/0x730 [ 46.642265] do_async_page_fault+0x72/0xc0 [ 46.643430] async_page_fault+0x22/0x30 [ 46.644397] [ 46.644397] other info that might help us debug this: [ 46.644397] [ 46.645878] Chain exists of: [ 46.645878] (complete)wq_barr::done#2/1 --> &mm->mmap_sem --> &ei->i_mmap_sem [ 46.645878] [ 46.648037] Possible unsafe locking scenario: [ 46.648037] [ 46.656349] CPU0 CPU1 [ 46.657420] ---- ---- [ 46.658430] lock(&ei->i_mmap_sem); [ 46.659316] lock(&mm->mmap_sem); [ 46.660440] lock(&ei->i_mmap_sem); [ 46.661576] lock((complete)wq_barr::done#2/1); [ 46.662607] [ 46.662607] *** DEADLOCK *** [ 46.662607] [ 46.665157] 3 locks held by udevd/1525: [ 46.665837] #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b8/0xb60 [ 46.667493] #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7d/0xb0 [ 46.669275] #2: (pcpu_drain_mutex){+.+.}, at: [] drain_all_pages+0x104/0x750 [ 46.670883] [ 46.670883] stack backtrace: [ 46.671753] CPU: 2 PID: 1525 Comm: udevd Not tainted 4.13.0-rc6-next-20170823+ #7 [ 46.673326] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 46.675034] Call Trace: [ 46.678680] dump_stack+0x194/0x257 [ 46.679432] ? arch_local_irq_restore+0x53/0x53 [ 46.680308] print_circular_bug+0x503/0x710 [ 46.681090] ? __free_insn_slot+0x5c0/0x5c0 [ 46.683490] ? print_circular_bug_entry+0xb0/0xb0 [ 46.684466] check_prev_add+0x865/0x1520 [ 46.685451] ? copy_trace+0x1d0/0x1d0 [ 46.686562] ? check_usage+0xb70/0xb70 [ 46.687436] ? add_lock_to_list.isra.33+0x1ff/0x4f0 [ 46.688403] ? hlock_class+0x140/0x140 [ 46.689100] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 46.704195] ? copy_trace+0x1d0/0x1d0 [ 46.704769] __lock_acquire+0x3286/0x4620 [ 46.705513] ? __lock_acquire+0x3286/0x4620 [ 46.706274] ? check_prev_add+0xd9f/0x1520 [ 46.707186] ? copy_trace+0x1d0/0x1d0 [ 46.707794] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.708390] ? __page_cache_alloc+0x358/0x4d0 [ 46.709196] ? save_stack_trace+0x16/0x20 [ 46.713290] ? __lock_acquire+0x20f4/0x4620 [ 46.713714] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.714714] ? lock_downgrade+0x990/0x990 [ 46.715445] ? try_to_wake_up+0xbc/0x1600 [ 46.717204] ? do_raw_spin_trylock+0xf0/0x190 [ 46.734297] ? SyS_setgroups+0x250/0x250 [ 46.735250] ? sched_clock+0x31/0x40 [ 46.735970] ? check_noncircular+0x20/0x20 [ 46.736820] ? trace_hardirqs_off+0xd/0x10 [ 46.737820] ? try_to_wake_up+0xf9/0x1600 [ 46.740273] ? check_noncircular+0x20/0x20 [ 46.745412] ? check_noncircular+0x20/0x20 [ 46.746803] ? check_noncircular+0x20/0x20 [ 46.747394] lock_acquire+0x1d5/0x580 [ 46.786977] ? flush_work+0x621/0x930 [ 46.787608] ? lock_release+0xd70/0xd70 [ 46.788273] ? check_same_owner+0x320/0x320 [ 46.788759] ? rcu_note_context_switch+0x710/0x710 [ 46.789720] ? __might_sleep+0x95/0x190 [ 46.790521] wait_for_completion+0xc8/0x770 [ 46.792059] ? flush_work+0x621/0x930 [ 46.792629] ? wait_for_completion_interruptible+0x820/0x820 [ 46.793686] ? __lockdep_init_map+0xe4/0x650 [ 46.794676] ? lock_release+0xd70/0xd70 [ 46.796293] ? mark_held_locks+0xb2/0x100 [ 46.797046] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 46.798535] flush_work+0x621/0x930 [ 46.799831] ? wq_pool_ids_show+0x290/0x290 [ 46.800610] ? insert_work+0x5d0/0x5d0 [ 46.801747] ? lock_acquire+0x1d5/0x580 [ 46.803846] ? drain_all_pages+0x104/0x750 [ 46.807599] ? lock_release+0xd70/0xd70 [ 46.809032] ? flush_workqueue_prep_pwqs+0x6d0/0x6d0 [ 46.810244] ? queue_work_on+0xc2/0x1c0 [ 46.811052] ? _find_next_bit+0xee/0x120 [ 46.811447] drain_all_pages+0x490/0x750 [ 46.812156] ? drain_local_pages+0x30/0x30 [ 46.813040] ? check_same_owner+0x320/0x320 [ 46.813882] __alloc_pages_slowpath+0xd2e/0x2ee0 [ 46.814423] ? print_usage_bug+0x480/0x480 [ 46.815022] ? print_usage_bug+0x480/0x480 [ 46.815774] ? check_noncircular+0x20/0x20 [ 46.817170] ? warn_alloc+0x2f0/0x2f0 [ 46.817913] ? __lock_acquire+0x732/0x4620 [ 46.819068] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 46.820052] ? trace_do_page_fault+0x141/0x730 [ 46.821149] ? check_noncircular+0x20/0x20 [ 46.822520] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.830356] ? find_held_lock+0x39/0x1d0 [ 46.830872] ? lock_downgrade+0x990/0x990 [ 46.831328] ? __lock_is_held+0xbc/0x140 [ 46.831858] ? check_same_owner+0x320/0x320 [ 46.832313] ? rcu_note_context_switch+0x710/0x710 [ 46.832920] ? __might_sleep+0x95/0x190 [ 46.833364] __alloc_pages_nodemask+0x9f7/0xd80 [ 46.842747] ? find_get_entry+0x53c/0x9e0 [ 46.844264] ? __alloc_pages_slowpath+0x2ee0/0x2ee0 [ 46.845774] ? find_get_pages_tag+0xf40/0xf40 [ 46.851830] ? lock_downgrade+0x990/0x990 [ 46.852242] ? find_held_lock+0x39/0x1d0 [ 46.852683] alloc_pages_current+0xb6/0x1e0 [ 46.853114] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 46.853634] __page_cache_alloc+0x358/0x4d0 [ 46.854082] ? unwind_dump+0x4c0/0x4c0 [ 46.854483] ? trace_event_raw_event_file_check_and_advance_wb_err+0x490/0x490 [ 46.855462] __do_page_cache_readahead+0x2ec/0xc00 [ 46.862267] ? unwind_get_return_address+0x61/0xa0 [ 46.863478] ? read_cache_pages+0x9a0/0x9a0 [ 46.864136] ? save_stack_trace+0x16/0x20 [ 46.864781] ? __lock_acquire+0x20f4/0x4620 [ 46.865460] ? find_held_lock+0x39/0x1d0 [ 46.866080] ? radix_tree_next_chunk+0x5e8/0xdf0 [ 46.866817] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.867626] ? find_held_lock+0x39/0x1d0 [ 46.868274] ? lock_downgrade+0x990/0x990 [ 46.868906] filemap_fault+0xb1a/0x1d30 [ 46.869536] ? filemap_fault+0xb1a/0x1d30 [ 46.870451] ? __lock_page_or_retry+0x500/0x500 [ 46.871345] ? filemap_map_pages+0x942/0x15d0 [ 46.872033] ? find_get_entries_tag+0xeb0/0xeb0 [ 46.873617] ? __lock_acquire+0x732/0x4620 [ 46.874699] ? check_noncircular+0x20/0x20 [ 46.875869] ? page_add_new_anon_rmap+0x750/0x750 [ 46.877049] ? lock_downgrade+0x990/0x990 [ 46.877708] ? __check_object_size+0x25d/0x4f0 [ 46.878421] ? skb_to_sgvec_nomark+0x40/0x40 [ 46.879095] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.879894] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 46.880695] ? lock_acquire+0x1d5/0x580 [ 46.881326] ? ext4_filemap_fault+0x7d/0xb0 [ 46.882060] ? lock_release+0xd70/0xd70 [ 46.882679] ? check_same_owner+0x320/0x320 [ 46.883524] ? rcu_note_context_switch+0x710/0x710 [ 46.884747] ? find_held_lock+0x39/0x1d0 [ 46.885553] ? __might_sleep+0x95/0x190 [ 46.886424] ? down_read+0x96/0x150 [ 46.886975] ? ext4_filemap_fault+0x7d/0xb0 [ 46.888027] ? __down_interruptible+0x6a0/0x6a0 [ 46.888913] ext4_filemap_fault+0x85/0xb0 [ 46.889743] __do_fault+0xeb/0x30f [ 46.890343] ? pte_offset_kernel+0xc7/0xc7 [ 46.890983] ? check_noncircular+0x20/0x20 [ 46.891959] __handle_mm_fault+0x1b98/0x39e0 [ 46.892905] ? __pmd_alloc+0x4e0/0x4e0 [ 46.893528] ? lock_downgrade+0x990/0x990 [ 46.894287] ? find_held_lock+0x39/0x1d0 [ 46.895071] ? __lock_is_held+0xbc/0x140 [ 46.895932] handle_mm_fault+0x3bb/0x860 [ 46.896685] ? down_read_trylock+0xdb/0x170 [ 46.897341] ? __handle_mm_fault+0x39e0/0x39e0 [ 46.898130] ? vmacache_find+0x61/0x270 [ 46.899244] ? find_vma+0x30/0x150 [ 46.899895] __do_page_fault+0x4f6/0xb60 [ 46.900870] trace_do_page_fault+0x141/0x730 [ 46.902178] ? SyS_sendmmsg+0x60/0x60 [ 46.903021] ? do_page_fault+0x70/0x70 [ 46.903931] ? up_read+0x40/0x40 [ 46.904567] ? do_munmap+0x4e2/0xdf0 [ 46.905591] ? retint_user+0x18/0x23 [ 46.906582] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.907551] do_async_page_fault+0x72/0xc0 [ 46.908361] async_page_fault+0x22/0x30 [ 46.909115] RIP: 0033:0x7f2275a44b10 [ 46.910152] RSP: 002b:00007ffdf1ea48b8 EFLAGS: 00010202 [ 46.914042] RAX: 0000000000000008 RBX: 00000000019e0350 RCX: 0000000000000010 [ 46.915644] RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000009 [ 46.917105] RBP: 0000000000000009 R08: 0000000001bd35a0 R09: 0000000000000000 [ 46.918604] R10: 00000000019e0030 R11: 00007f2275aa8c81 R12: 00000000019e0370 [ 46.919943] R13: 00000000019e0350 R14: ffffffffffffffff R15: 00000000019e0030 [ 47.471514] syzkaller620903: page allocation failure: order:5, mode:0x16040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK), nodemask=(null) [ 47.472632] syzkaller620903 cpuset=/ mems_allowed=0-1 [ 47.473075] CPU: 0 PID: 3092 Comm: syzkaller620903 Not tainted 4.13.0-rc6-next-20170823+ #7 [ 47.473846] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 47.474654] Call Trace: [ 47.474924] dump_stack+0x194/0x257 [ 47.475297] ? arch_local_irq_restore+0x53/0x53 [ 47.475762] ? isolate_lru_page+0x11d0/0x11d0 [ 47.476220] warn_alloc+0x1c2/0x2f0 [ 47.476590] ? zone_watermark_ok_safe+0x430/0x430 [ 47.477080] ? free_hot_cold_page_list+0x470/0x470 [ 47.477582] ? rcu_note_context_switch+0x710/0x710 [ 47.478085] __alloc_pages_slowpath+0x26ce/0x2ee0 [ 47.478602] ? warn_alloc+0x2f0/0x2f0 [ 47.478994] ? warn_alloc+0x2f0/0x2f0 [ 47.479380] ? warn_alloc+0x2f0/0x2f0 [ 47.479780] ? misc_open+0x69/0x500 [ 47.480170] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.480703] ? lookup_fast+0x392/0xfa0 [ 47.481117] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.497705] ? misc_open+0x69/0x500 [ 47.498085] ? __mutex_lock+0x16f/0x1870 [ 47.498494] ? should_fail+0x23b/0xa40 [ 47.498864] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.499369] ? fs_reclaim_acquire+0x20/0x20