task smbd blocked for more than 120 seconds

I've a home NAS based on OpenMediaVault 4. The problem is I'm constantly getting service hangs (smbd, transmission).

• Filesystem on disks: xfs + MergerFs (fuse)
• disks are ok (based on smart)

Please help. I've no idea what is going on.

kern.log (smbd):

Sep 12 20:09:50 nas kernel: [ 8942.893366] INFO: task smbd:5987 blocked for more than 120 seconds. Sep 12 20:09:50 nas kernel: [ 8942.893405] Not tainted 4.19.0-0.bpo.5-amd64 #1 Debian 4.19.37-4~bpo9+1 Sep 12 20:09:50 nas kernel: [ 8942.893439] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Sep 12 20:09:50 nas kernel: [ 8942.893480] smbd D 0 5987 1180 0x00000000 Sep 12 20:09:50 nas kernel: [ 8942.893484] Call Trace: Sep 12 20:09:50 nas kernel: [ 8942.893494] ? __schedule+0x3f5/0x880 Sep 12 20:09:50 nas kernel: [ 8942.893503] ? fuse_dentry_revalidate+0x40/0x2e0 [fuse] Sep 12 20:09:50 nas kernel: [ 8942.893506] schedule+0x32/0x80 Sep 12 20:09:50 nas kernel: [ 8942.893510] rwsem_down_read_failed+0x12e/0x190 Sep 12 20:09:50 nas kernel: [ 8942.893516] ? call_rwsem_down_read_failed+0x14/0x30 Sep 12 20:09:50 nas kernel: [ 8942.893519] call_rwsem_down_read_failed+0x14/0x30 Sep 12 20:09:50 nas kernel: [ 8942.893522] down_read+0x1c/0x30 Sep 12 20:09:50 nas kernel: [ 8942.893526] lookup_slow+0x27/0x50 Sep 12 20:09:50 nas kernel: [ 8942.893529] walk_component+0x1c6/0x360 Sep 12 20:09:50 nas kernel: [ 8942.893531] ? path_init+0x1f4/0x2f0 Sep 12 20:09:50 nas kernel: [ 8942.893534] path_lookupat+0x67/0x200 Sep 12 20:09:50 nas kernel: [ 8942.893537] filename_lookup+0xb8/0x1a0 Sep 12 20:09:50 nas kernel: [ 8942.893541] ? __check_object_size+0x161/0x1a0 Sep 12 20:09:50 nas kernel: [ 8942.893546] ? strncpy_from_user+0x48/0x160 Sep 12 20:09:50 nas kernel: [ 8942.893548] ? getname_flags+0x6a/0x1e0 Sep 12 20:09:50 nas kernel: [ 8942.893551] ? vfs_statx+0x73/0xe0 Sep 12 20:09:50 nas kernel: [ 8942.893554] vfs_statx+0x73/0xe0 Sep 12 20:09:50 nas kernel: [ 8942.893558] __do_sys_newlstat+0x39/0x70 Sep 12 20:09:50 nas kernel: [ 8942.893563] do_syscall_64+0x55/0x120 Sep 12 20:09:50 nas kernel: [ 8942.893565] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Sep 12 20:09:50 nas kernel: [ 8942.893568] RIP: 0033:0x7fd30d571335 Sep 12 20:09:50 nas kernel: [ 8942.893574] Code: Bad RIP value. Sep 12 20:09:50 nas kernel: [ 8942.893576] RSP: 002b:00007ffd44e321e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 Sep 12 20:09:50 nas kernel: [ 8942.893578] RAX: ffffffffffffffda RBX: 0000559aa112ef50 RCX: 00007fd30d571335 Sep 12 20:09:50 nas kernel: [ 8942.893580] RDX: 00007ffd44e32220 RSI: 00007ffd44e32220 RDI: 0000559aa112df50 Sep 12 20:09:50 nas kernel: [ 8942.893581] RBP: 00007ffd44e322e0 R08: 00007fd30d8302a8 R09: 0000000000001010 Sep 12 20:09:50 nas kernel: [ 8942.893582] R10: 0000000000000070 R11: 0000000000000246 R12: 0000559aa112df50 Sep 12 20:09:50 nas kernel: [ 8942.893584] R13: 0000559aa112df8d R14: 0000559aa110ea34 R15: 0000559aa110ea35 Sep 12 20:11:51 nas kernel: [ 9063.726945] INFO: task smbd:5987 blocked for more than 120 seconds.

kern.log (transmission-da):

Sep 19 18:41:09 nas kernel: [ 3384.552496] RSP: 002b:00007ff3626da758 EFLAGS: 00000206 ORIG_RAX: 0000000000000052 Sep 19 18:41:09 nas kernel: [ 3384.552499] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff36762ed47 Sep 19 18:41:09 nas kernel: [ 3384.552500] RDX: 0000000000000000 RSI: 00007ff35c127d60 RDI: 00007ff35c280440 Sep 19 18:41:09 nas kernel: [ 3384.552501] RBP: 0000000000000000 R08: 00007ff35c108100 R09: 727574616d2f2f00 Sep 19 18:41:09 nas kernel: [ 3384.552503] R10: 475f5f6e726f7065 R11: 0000000000000206 R12: 00007ff35c280440 Sep 19 18:41:09 nas kernel: [ 3384.552504] R13: 00007ff35c108100 R14: 000000005c127d01 R15: 0000000000000001 Sep 19 18:43:10 nas kernel: [ 3505.384798] INFO: task transmission-da:899 blocked for more than 120 seconds. Sep 19 18:43:10 nas kernel: [ 3505.384842] Not tainted 4.19.0-0.bpo.5-amd64 #1 Debian 4.19.37-4~bpo9+1 Sep 19 18:43:10 nas kernel: [ 3505.384876] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Sep 19 18:43:10 nas kernel: [ 3505.384914] transmission-da D 0 899 1 0x00000004 Sep 19 18:43:10 nas kernel: [ 3505.384918] Call Trace: Sep 19 18:43:10 nas kernel: [ 3505.384929] ? __schedule+0x3f5/0x880 Sep 19 18:43:10 nas kernel: [ 3505.384933] schedule+0x32/0x80 Sep 19 18:43:10 nas kernel: [ 3505.384941] request_wait_answer+0xba/0x210 [fuse] Sep 19 18:43:10 nas kernel: [ 3505.384945] ? remove_wait_queue+0x60/0x60 Sep 19 18:43:10 nas kernel: [ 3505.384950] __fuse_request_send+0x81/0x90 [fuse] Sep 19 18:43:10 nas kernel: [ 3505.384954] fuse_simple_request+0xbd/0x190 [fuse] Sep 19 18:43:10 nas kernel: [ 3505.384960] fuse_rename_common+0xf8/0x260 [fuse] Sep 19 18:43:10 nas kernel: [ 3505.384966] fuse_rename2+0x5b/0x80 [fuse] Sep 19 18:43:10 nas kernel: [ 3505.384970] vfs_rename+0x6e1/0x910 Sep 19 18:43:10 nas kernel: [ 3505.384974] do_renameat2+0x504/0x590 Sep 19 18:43:10 nas kernel: [ 3505.384978] __x64_sys_rename+0x1c/0x20 Sep 19 18:43:10 nas kernel: [ 3505.384982] do_syscall_64+0x55/0x120 Sep 19 18:43:10 nas kernel: [ 3505.384985] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Sep 19 18:43:10 nas kernel: [ 3505.384988] RIP: 0033:0x7ff36762ed47 Sep 19 18:43:10 nas kernel: [ 3505.384994] Code: Bad RIP value. Sep 19 18:43:10 nas kernel: [ 3505.384996] RSP: 002b:00007ff3626da758 EFLAGS: 00000206 ORIG_RAX: 0000000000000052 Sep 19 18:43:10 nas kernel: [ 3505.384998] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff36762ed47 Sep 19 18:43:10 nas kernel: [ 3505.385000] RDX: 0000000000000000 RSI: 00007ff35c127d60 RDI: 00007ff35c280440 Sep 19 18:43:10 nas kernel: [ 3505.385001] RBP: 0000000000000000 R08: 00007ff35c108100 R09: 727574616d2f2f00 Sep 19 18:43:10 nas kernel: [ 3505.385002] R10: 475f5f6e726f7065 R11: 0000000000000206 R12: 00007ff35c280440 Sep 19 18:43:10 nas kernel: [ 3505.385004] R13: 00007ff35c108100 R14: 000000005c127d01 R15: 0000000000000001 Sep 19 18:45:11 nas kernel: [ 3626.217117] INFO: task transmission-da:899 blocked for more than 120 seconds. Sep 19 18:45:11 nas kernel: [ 3626.217160] Not tainted 4.19.0-0.bpo.5-amd64 #1 Debian 4.19.37-4~bpo9+1 Sep 19 18:45:11 nas kernel: [ 3626.217195] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Sep 19 18:45:11 nas kernel: [ 3626.217233] transmission-da D 0 899 1 0x00000004 Sep 19 18:45:11 nas kernel: [ 3626.217237] Call Trace: Sep 19 18:45:11 nas kernel: [ 3626.217248] ? __schedule+0x3f5/0x880 Sep 19 18:45:11 nas kernel: [ 3626.217252] schedule+0x32/0x80 Sep 19 18:45:11 nas kernel: [ 3626.217260] request_wait_answer+0xba/0x210 [fuse] Sep 19 18:45:11 nas kernel: [ 3626.217264] ? remove_wait_queue+0x60/0x60 Sep 19 18:45:11 nas kernel: [ 3626.217268] __fuse_request_send+0x81/0x90 [fuse] Sep 19 18:45:11 nas kernel: [ 3626.217273] fuse_simple_request+0xbd/0x190 [fuse] Sep 19 18:45:11 nas kernel: [ 3626.217278] fuse_rename_common+0xf8/0x260 [fuse] Sep 19 18:45:11 nas kernel: [ 3626.217285] fuse_rename2+0x5b/0x80 [fuse] Sep 19 18:45:11 nas kernel: [ 3626.217288] vfs_rename+0x6e1/0x910 Sep 19 18:45:11 nas kernel: [ 3626.217292] do_renameat2+0x504/0x590 Sep 19 18:45:11 nas kernel: [ 3626.217296] __x64_sys_rename+0x1c/0x20 Sep 19 18:45:11 nas kernel: [ 3626.217300] do_syscall_64+0x55/0x120 Sep 19 18:45:11 nas kernel: [ 3626.217303] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Sep 19 18:45:11 nas kernel: [ 3626.217306] RIP: 0033:0x7ff36762ed47 Sep 19 18:45:11 nas kernel: [ 3626.217311] Code: Bad RIP value. Sep 19 18:45:11 nas kernel: [ 3626.217313] RSP: 002b:00007ff3626da758 EFLAGS: 00000206 ORIG_RAX: 0000000000000052 Sep 19 18:45:11 nas kernel: [ 3626.217315] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff36762ed47 Sep 19 18:45:11 nas kernel: [ 3626.217317] RDX: 0000000000000000 RSI: 00007ff35c127d60 RDI: 00007ff35c280440 Sep 19 18:45:11 nas kernel: [ 3626.217318] RBP: 0000000000000000 R08: 00007ff35c108100 R09: 727574616d2f2f00 Sep 19 18:45:11 nas kernel: [ 3626.217319] R10: 475f5f6e726f7065 R11: 0000000000000206 R12: 00007ff35c280440 Sep 19 18:45:11 nas kernel: [ 3626.217321] R13: 00007ff35c108100 R14: 000000005c127d01 R15: 0000000000000001