EXT4-fs (loop0): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, INFO: task syz-executor291:7976 blocked for more than 140 seconds. Not tainted 4.14.296-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor291 D26864 7976 7975 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:408 [inline] __sync_dirty_buffer+0x214/0x290 fs/buffer.c:3235 __ext4_handle_dirty_metadata+0x169/0x480 fs/ext4/ext4_jbd2.c:300 ext4_finish_convert_inline_dir fs/ext4/inline.c:1190 [inline] ext4_convert_inline_data_nolock+0x8d8/0xc60 fs/ext4/inline.c:1266 ext4_try_add_inline_entry+0x2a5/0x4a0 fs/ext4/inline.c:1339 ext4_add_entry+0x2ee/0xa40 fs/ext4/namei.c:2138 ext4_mkdir+0x5cf/0xbd0 fs/ext4/namei.c:2732 vfs_mkdir+0x463/0x6e0 fs/namei.c:3851 SYSC_mkdirat fs/namei.c:3874 [inline] SyS_mkdirat+0x1fd/0x270 fs/namei.c:3858 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8b568f6979 RSP: 002b:00007ffdfb48f9d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8b568f6979 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007f8b56964ec0 R09: 00007f8b56964ec0 R10: 00007f8b56964ec0 R11: 0000000000000246 R12: 00007ffdfb48fa00 R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 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/7701: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 3 locks held by syz-executor291/7976: #0: (sb_writers#3){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] filename_create+0x12a/0x3f0 fs/namei.c:3676 #2: (&ei->xattr_sem){++++}, at: [] ext4_write_lock_xattr fs/ext4/xattr.h:154 [inline] #2: (&ei->xattr_sem){++++}, at: [] ext4_try_add_inline_entry+0xc2/0x4a0 fs/ext4/inline.c:1297 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.296-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 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 CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.296-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 task: ffff8880b540e200 task.stack: ffff8880b5418000 RIP: 0010:debug_smp_processor_id+0x0/0x20 lib/smp_processor_id.c:57 RSP: 0018:ffff8880b541fdb8 EFLAGS: 00000046 RAX: 1ffffffff11ef4a8 RBX: 0000000000035000 RCX: 0000000000006190 RDX: 1ffffffff11ef4a2 RSI: 0000000000000001 RDI: ffffffff88f7a548 RBP: fffffbfff11ef512 R08: ffffffff8b9d3780 R09: 00000000000c0033 R10: ffff8880b540ea88 R11: ffff8880b540e200 R12: dffffc0000000000 R13: ffffffff88f7a500 R14: ffffffff88f7a540 R15: ffffffff88f7a500 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f429ba96000 CR3: 00000000a1b5e000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_gp_cleanup kernel/rcu/tree.c:2170 [inline] rcu_gp_kthread+0x11b0/0x1e60 kernel/rcu/tree.c:2304 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 44 ff ff ff e8 32 99 64 fe eb a5 4c 89 ff e8 98 99 64 fe e9 c6 fe ff ff e8 8e 99 64 fe e9 9a fe ff ff 66 0f 1f 84 00 00 00 00 00 bb db 3a fe 48 c7 c6 c0 09 cd 87 48 c7 c7 00 0a cd 87 e9 a8