EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue INFO: task syz-executor981:7994 blocked for more than 140 seconds. Not tainted 4.14.285-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor981 D26496 7994 7993 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 io_schedule+0xb5/0x120 kernel/sched/core.c:5035 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:249 __wait_on_bit_lock+0xc2/0x1d0 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xbc/0xd0 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:213 [inline] __lock_buffer+0x43/0x50 fs/buffer.c:72 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x214/0x290 fs/buffer.c:3235 __ext4_handle_dirty_metadata+0x169/0x480 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4e1/0xbd0 fs/ext4/inline.c:1260 ext4_convert_inline_data+0x25f/0x400 fs/ext4/inline.c:2027 ext4_page_mkwrite+0x1d8/0xf70 fs/ext4/inode.c:6197 do_page_mkwrite+0xd4/0x2e0 mm/memory.c:2487 wp_page_shared mm/memory.c:2791 [inline] do_wp_page+0x7e2/0x1db0 mm/memory.c:2891 handle_pte_fault mm/memory.c:4121 [inline] __handle_mm_fault+0x234f/0x4620 mm/memory.c:4229 handle_mm_fault+0x455/0x9c0 mm/memory.c:4266 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0000:0x431bde82d7b634db RSP: 69662f2e:0000000000000000 EFLAGS: 7ffcd67c6160 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/7596: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 4 locks held by syz-executor981/7994: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b9/0xad0 arch/x86/mm/fault.c:1371 #1: (sb_pagefaults){.+.+}, at: [] sb_start_pagefault include/linux/fs.h:1580 [inline] #1: (sb_pagefaults){.+.+}, at: [] ext4_page_mkwrite+0x198/0xf70 fs/ext4/inode.c:6192 #2: (&ei->i_mmap_sem){++++}, at: [] ext4_page_mkwrite+0x1d0/0xf70 fs/ext4/inode.c:6195 #3: (&ei->xattr_sem){++++}, at: [] ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #3: (&ei->xattr_sem){++++}, at: [] ext4_convert_inline_data+0x1b4/0x400 fs/ext4/inline.c:2025 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.285-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 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8723e1ee