INFO: task syz-executor.5:20870 blocked for more than 140 seconds. Not tainted 4.14.209-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29664 20870 19859 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 request_wait_answer+0x30d/0x620 fs/fuse/dev.c:478 __fuse_request_send+0x108/0x1a0 fs/fuse/dev.c:498 fuse_request_send fs/fuse/dev.c:511 [inline] fuse_simple_request+0x2fa/0x790 fs/fuse/dev.c:569 fuse_do_getattr+0x209/0xb60 fs/fuse/dir.c:920 fuse_update_get_attr fs/fuse/dir.c:945 [inline] fuse_update_get_attr fs/fuse/dir.c:937 [inline] fuse_getattr+0x2e1/0x500 fs/fuse/dir.c:1823 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x104/0x180 fs/stat.c:189 vfs_stat include/linux/fs.h:3065 [inline] SYSC_newstat fs/stat.c:337 [inline] SyS_newstat+0x83/0xe0 fs/stat.c:333 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45deb9 RSP: 002b:00007fe5a8335c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035180 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000bc0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fff7c77811f R14: 00007fe5a83369c0 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1531: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by agetty/19613: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.209-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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4611 Comm: systemd-journal Not tainted 4.14.209-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a18be500 task.stack: ffff8880a18c0000 RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:739 [inline] RIP: 0010:debug_check_no_obj_freed+0x26d/0x674 lib/debugobjects.c:776 RSP: 0018:ffff8880a18c7b08 EFLAGS: 00000046 RAX: 1ffff110126040e0 RBX: dffffc0000000000 RCX: ffff8880a2af5680 RDX: 0000000000000008 RSI: ffff8880a18c7b90 RDI: ffff888098d270c0 RBP: ffffffff8bf9e288 R08: 1ffff110131a4e18 R09: 0000000000000086 R10: ffff8880a18bed88 R11: ffff8880a18be500 R12: ffff8880a18c7bb0 R13: ffffea000183c2a0 R14: ffff8880a2af4680 R15: ffff888093020700 FS: 00007f760905e8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7606697000 CR3: 00000000a360f000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kmem_cache_free+0x156/0x2b0 mm/slab.c:3757 putname+0xcd/0x110 fs/namei.c:259 filename_parentat+0x477/0x520 fs/namei.c:2430 filename_create+0x8a/0x3f0 fs/namei.c:3657 user_path_create fs/namei.c:3732 [inline] SYSC_mkdirat fs/namei.c:3864 [inline] SyS_mkdirat+0x95/0x270 fs/namei.c:3856 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f760831a687 RSP: 002b:00007ffd6e2a5278 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffd6e2a8190 RCX: 00007f760831a687 RDX: 00007f7608d8ba00 RSI: 00000000000001ed RDI: 00005594b45eb8a0 RBP: 00007ffd6e2a52b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffd6e2a8190 R15: 00007ffd6e2a57a0 Code: 41 80 3c 18 00 0f 85 4e 03 00 00 4d 89 7d 08 4d 89 7c 24 e0 49 89 77 08 48 85 c0 74 47 49 89 c7 4c 89 f8 48 c1 e8 03 80 3c 18 00 <0f> 84 01 ff ff ff 4c 89 ff 48 89 74 24 50 89 54 24 48 4c 89 4c