INFO: task syz-executor282:7986 blocked for more than 140 seconds. Not tainted 4.14.304-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor282 D28104 7986 7981 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 fuse_wait_on_page_writeback fs/fuse/file.c:385 [inline] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 fs/fuse/file.c:381 fuse_launder_page fs/fuse/file.c:2042 [inline] fuse_launder_page+0xa2/0xd0 fs/fuse/file.c:2035 do_launder_page mm/truncate.c:609 [inline] invalidate_inode_pages2_range+0x547/0xc00 mm/truncate.c:685 fuse_finish_open+0x262/0x500 fs/fuse/file.c:181 fuse_open_common+0x234/0x290 fs/fuse/file.c:224 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f9b40bc84b9 RSP: 002b:00007f9b40b582f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f9b40c594d0 RCX: 00007f9b40bc84b9 RDX: 00007f9b40bc84b9 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007f9b40c26154 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007f9b40c22148 R14: 00007f9b40c24150 R15: 00007f9b40c594d8 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7662: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 2 locks held by syz-executor282/7986: #0: (sb_writers#10){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 fs/fuse/file.c:217 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4626 Comm: systemd-journal Not tainted 4.14.304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 task: ffff8880a12661c0 task.stack: ffff8880a1268000 RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:91 [inline] RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:775 [inline] RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0x5b7/0x870 kernel/locking/lockdep.c:4016 RSP: 0018:ffff8880a126fe40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff1101424dfcb RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff8880a1266a44 RBP: ffffffff88f785c0 R08: 0000000000000000 R09: 0000000000020011 R10: 0000000000000000 R11: ffff8880a12661c0 R12: ffffffff8136fbb3 R13: ffff8880a12661c0 R14: ffff8880a12661c0 R15: 0000000000000000 FS: 00007fd2be8828c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd2bbc50018 CR3: 00000000a11df000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] __task_pid_nr_ns+0x1ea/0x440 kernel/pid.c:537 task_tgid_vnr include/linux/sched.h:1262 [inline] sys_getpid+0x1a/0x20 kernel/sys.c:842 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7fd2bdb1af17 RSP: 002b:00007ffea32b1058 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 000055b4b221b1e0 RCX: 00007fd2bdb1af17 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 000055b4b221b1e0 RBP: 00007ffea32b1150 R08: 00007ffea32ee000 R09: 00000101f9001ab0 R10: 0016981f3e83f6c8 R11: 0000000000000202 R12: 0000000000001212 R13: 00007ffea32b11e8 R14: ffffffffffffffff R15: 0005f32be90ecdf8 Code: ff ff e9 6b 23 c1 05 65 ff 05 f6 9a c0 7e 48 8b 05 27 b3 b1 08 e8 5a 4e 04 00 85 c0 74 0d 80 3d 08 63 b1 08 00 0f 84 47 01 00 00 <65> ff 0d d2 9a c0 7e 0f 85 a5 fb ff ff e8 83 37 be ff e9 9b fb