INFO: task syz-executor.5:20613 blocked for more than 140 seconds. ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt Not tainted 4.14.230-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt syz-executor.5 D29224 20613 10485 0x00000000 ERROR: (device loop5): xtSearch: XT_GETPAGE: xtree page corrupt Call Trace: ERROR: (device loop4): xtSearch: XT_GETPAGE: xtree page corrupt context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop5, sector 0 ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt schedule+0x8d/0x1b0 kernel/sched/core.c:3428 d_wait_lookup fs/dcache.c:2479 [inline] d_alloc_parallel+0x100e/0x16b0 fs/dcache.c:2561 print_req_error: I/O error, dev loop1, sector 0 ERROR: (device loop4): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt lookup_open+0x462/0x1750 fs/namei.c:3154 print_req_error: I/O error, dev loop3, sector 0 do_last fs/namei.c:3334 [inline] path_openat+0x14bb/0x2970 fs/namei.c:3569 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt print_req_error: I/O error, dev loop4, sector 0 print_req_error: I/O error, dev loop1, sector 0 do_filp_open+0x179/0x3c0 fs/namei.c:3603 ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt do_sys_open+0x296/0x410 fs/open.c:1081 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f09500ea188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020002000 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffd21b40aaf R14: 00007f09500ea300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:3/336: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by syz-executor.5/20605: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] do_last fs/namei.c:3333 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] path_openat+0x149b/0x2970 fs/namei.c:3569 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 1 lock held by syz-executor.5/20613: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] do_last fs/namei.c:3333 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] path_openat+0x149b/0x2970 fs/namei.c:3569 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.230-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4625 Comm: systemd-udevd Not tainted 4.14.230-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809c68e180 task.stack: ffff88809c690000 RIP: 0010:__debug_object_init+0x2/0x7a0 lib/debugobjects.c:335 RSP: 0018:ffff88809c697cc8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88f776e0 RDI: ffff8880a16cd340 RBP: 0000000000000000 R08: ffffffff8c0172c8 R09: ffffffff88f776e0 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a16cd340 R13: dffffc0000000000 R14: 1ffff110138d2f9e R15: ffff88809c697d70 FS: 00007fd9335098c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055c8b00fd0e8 CR3: 000000009c727000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x391/0x490 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7d0 kernel/rcu/tree.c:3050 file_free fs/file_table.c:56 [inline] __fput+0x43b/0x7a0 fs/file_table.c:227 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fd932353a07 RSP: 002b:00007ffe10e0de70 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000010 RCX: 00007fd932353a07 RDX: 00007fd93263a380 RSI: 00007fd932639b58 RDI: 0000000000000010 RBP: 00007fd933509710 R08: 000055c8b00fc0c0 R09: 0000000000008000 R10: 00007fd932639ba8 R11: 0000000000000202 R12: 0000000000000000 R13: 000055c8b00d2180 R14: 00000000000000fe R15: 000055c8b00ddfd0 Code: 24 e9 f1 fe ff ff e8 be 3b 65 fe e9 79 ff ff ff 4c 89 e7 e8 41 3b 65 fe 4c 8b 04 24 e9 3f ff ff ff 0f 1f 84 00 00 00 00 00 41 57 <49> bf 00 00 00 00 00 fc ff df 41 56 41 55 41 54 55 48 89 fd 53