Kernel 6.0.0 also has this bug
ASRock X670E Taichi
Ryzen 9 7950X
32GB DDR5-5600 C32
AMD Radeon 6700XT
1x NVMe 4.0 1TB SSD (boot, home, 64GB swap part)
1x NVMe 4.0 2TB SSD (dev, VMs, 128GB swapfile)
1x NVMe 3.0 2TB SSD (games)
dmesg excerpt:
5.626458] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
15-.... } 6 jiffies s: 185 root: 0x1/.
[ 5.626645] rcu: blocking rcu_node structures (internal RCU debug):
l=1:0-15:0x8000/.
[ 5.626737] Task dump for CPU 15:
[ 5.626738] task:systemd-udevd state:R running task stack: 0 pid:
721 ppid: 700 flags:0x0000400a
[ 5.626740] Call Trace:
[ 5.626741] <TASK>
[ 5.626742] ? kallsyms_lookup_buildid+0x109/0x180
[ 5.626746] ? kallsyms_lookup+0x14/0x30
[ 5.626747] ? test_for_valid_rec+0x6d/0xc0
[ 5.626750] ? ftrace_module_enable+0xad/0x2c0
[ 5.626751] ? set_memory_x+0x4e/0x70
[ 5.626753] ? load_module+0x64b/0xc10
[ 5.626755] ? __do_sys_finit_module+0xc4/0x140
[ 5.626755] ? __do_sys_finit_module+0xc4/0x140
[ 5.626756] ? __x64_sys_finit_module+0x18/0x30
[ 5.626757] ? do_syscall_64+0x5b/0x90
[ 5.626760] ? do_syscall_64+0x67/0x90
[ 5.626761] ? sysvec_call_function_single+0x4b/0xd0
[ 5.626762] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 5.626764] </TASK>
[ 5.706458] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks:
{ 15-.... } 26 jiffies s: 185 root: 0x1/.
[ 5.706655] rcu: blocking rcu_node structures (internal RCU debug):
l=1:0-15:0x8000/.
[ 5.706756] Task dump for CPU 15:
[ 5.706757] task:systemd-udevd state:R running task stack: 0 pid:
721 ppid: 700 flags:0x0000400a
[ 5.706759] Call Trace:
[ 5.706759] <TASK>
[ 5.706760] ? kallsyms_lookup_buildid+0x109/0x180
[ 5.706762] ? kallsyms_lookup+0x14/0x30
[ 5.706763] ? test_for_valid_rec+0x6d/0xc0
[ 5.706765] ? ftrace_module_enable+0xad/0x2c0
[ 5.706766] ? set_memory_x+0x4e/0x70
[ 5.706767] ? load_module+0x64b/0xc10
[ 5.706768] ? __do_sys_finit_module+0xc4/0x140
[ 5.706769] ? __do_sys_finit_module+0xc4/0x140
[ 5.706771] ? __x64_sys_finit_module+0x18/0x30
[ 5.706771] ? do_syscall_64+0x5b/0x90
[ 5.706773] ? do_syscall_64+0x67/0x90
[ 5.706773] ? sysvec_call_function_single+0x4b/0xd0
[ 5.706774] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 5.706776] </TASK>
[ 5.786457] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks:
{ 15-.... } 46 jiffies s: 185 root: 0x1/.
[ 5.786665] rcu: blocking rcu_node structures (internal RCU debug):
l=1:0-15:0x8000/.
[ 5.786772] Task dump for CPU 15:
[ 5.786773] task:systemd-udevd state:R running task stack: 0 pid:
721 ppid: 700 flags:0x0000400a
[ 5.786774] Call Trace:
[ 5.786775] <TASK>
[ 5.786775] ? kallsyms_lookup_buildid+0x109/0x180
[ 5.786778] ? kallsyms_lookup+0x14/0x30
[ 5.786779] ? test_for_valid_rec+0x6d/0xc0
[ 5.786780] ? ftrace_module_enable+0xad/0x2c0
[ 5.786781] ? set_memory_x+0x4e/0x70
[ 5.786782] ? load_module+0x64b/0xc10
[ 5.786784] ? __do_sys_finit_module+0xc4/0x140
[ 5.786785] ? __do_sys_finit_module+0xc4/0x140
[ 5.786786] ? __x64_sys_finit_module+0x18/0x30
[ 5.786787] ? do_syscall_64+0x5b/0x90
[ 5.786788] ? do_syscall_64+0x67/0x90
[ 5.786789] ? sysvec_call_function_single+0x4b/0xd0
[ 5.786790] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 5.786791] </TASK>
[ 5.789477] usb 5-12: New USB device found, idVendor=05e3, idProduct=0610,
bcdDevice=32.98
[ 5.789480] usb 5-12: New USB device strings: Mfr=0, Product=1,
SerialNumber=0
[ 5.789481] usb 5-12: Product: USB2.0 Hub
[ 5.800637] hub 5-12:1.0: USB hub found
[ 5.804466] hub 5-12:1.0: 4 ports detected
[ 5.866457] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks:
{ 15-.... } 66 jiffies s: 185 root: 0x1/.
[ 5.866682] rcu: blocking rcu_node structures (internal RCU debug):
l=1:0-15:0x8000/.
[ 5.866795] Task dump for CPU 15:
[ 5.866796] task:systemd-udevd state:R running task stack: 0 pid:
721 ppid: 700 flags:0x0000400a
[ 5.866798] Call Trace:
[ 5.866798] <TASK>
[ 5.866799] ? kallsyms_lookup_buildid+0x109/0x180
[ 5.866801] ? kallsyms_lookup+0x14/0x30
[ 5.866802] ? test_for_valid_rec+0x6d/0xc0
[ 5.866804] ? ftrace_module_enable+0xad/0x2c0
[ 5.866805] ? set_memory_x+0x4e/0x70
[ 5.866806] ? load_module+0x64b/0xc10
[ 5.866807] ? __do_sys_finit_module+0xc4/0x140
[ 5.866808] ? __do_sys_finit_module+0xc4/0x140
[ 5.866810] ? __x64_sys_finit_module+0x18/0x30
[ 5.866811] ? do_syscall_64+0x5b/0x90
[ 5.866812] ? do_syscall_64+0x67/0x90
[ 5.866812] ? sysvec_call_function_single+0x4b/0xd0
[ 5.866813] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 5.866815] </TASK>
[ 5.942458] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks:
{ 15-.... } 85 jiffies s: 185 root: 0x1/.
[ 5.942696] rcu: blocking rcu_node structures (internal RCU debug):
l=1:0-15:0x8000/.
[ 5.942815] Task dump for CPU 15:
[ 5.942816] task:systemd-udevd state:R running task stack: 0 pid:
721 ppid: 700 flags:0x0000400a
[ 5.942817] Call Trace:
[ 5.942818] <TASK>
[ 5.942818] ? kallsyms_lookup_buildid+0x109/0x180
[ 5.942821] ? kallsyms_lookup+0x14/0x30
[ 5.942822] ? test_for_valid_rec+0x6d/0xc0
[ 5.942823] ? ftrace_module_enable+0xad/0x2c0
[ 5.942824] ? set_memory_x+0x4e/0x70
[ 5.942825] ? load_module+0x64b/0xc10
[ 5.942827] ? __do_sys_finit_module+0xc4/0x140
[ 5.942828] ? __do_sys_finit_module+0xc4/0x140
[ 5.942829] ? __x64_sys_finit_module+0x18/0x30
[ 5.942830] ? do_syscall_64+0x5b/0x90
[ 5.942831] ? do_syscall_64+0x67/0x90
[ 5.942832] ? sysvec_call_function_single+0x4b/0xd0
[ 5.942833] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 5.942834] </TASK>
[ 5.952551] [drm] amdgpu kernel modesetting enabled.
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https://bugs.launchpad.net/bugs/1991951
Title:
RCU stalls
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Fix Committed
Bug description:
our RCU Stall Timeouts are different to upstream defaults; with
regular one 3x longer; and expedited one 1000x shorter.
not sure why.
Let's harmonize on 60 & 0, which is 60 for regular ones that are set
on most architectures; and upstream default for the expedited ones.
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