Public bug reported:
Kernel 6.11-24-generic on Ubuntu 24.04 freezes (partially) some time
after boot (I've seen anything from 5 minutes to 3.5 hours). This did
not happen on 6.11.0-21-generic, which I ran for a couple or weeks
without issue, nor any other earlier version.
This is on a Dell R7515 server with an AMD EPYC 7302P CPU; in case it's
relevant I use ZFS.
When it freezes, the console prints a warning:
[12158.380885] ------------[ cut here ]------------
[12158.386332] WARNING: CPU: 0 PID: 0 at kernel/time/timer_migration.c:543
tmigr_cpu_new_timer+0x1c9/0x230
[12158.396381] Modules linked in: tcp_diag inet_diag bonding tls cfg80211
binfmt_misc ip6t_REJECT nf_reject_ipv6 xt_tcpudp ipt_REJECT f_reject_ipv4
xt_set nft_compat nf_tables ip_set_hash_net ip_set nls_iso8859_1 amd_atl
intel_rapl_msr intel_rapl_common amd64_edac eda_mce_amd dell_pc
platform_profile kvm_amd kvm dell_wmi ee1004 ses video enclosure dell_smbios
sparse_keymap i2c_piix4 ccp rapl scsi_trnsport_sas ptdma wmi_bmof k10temp
cdc_acm dcdbas dell_wmi_descriptor i2c_algo_bit i2c_smbus ipmi_ssif
acpi_power_meter mac_hid sch_fq_odel dm_multipath acpi_ipmi ipmi_si
ipmi_devintf ipmi_msghandler efi_pstore nfsd auth_rpcgss nfs_acl lockd grace
sunrpc nfnetlink dmi_ysfs ip_tables x_tables autofs4 zfs(PO) spl(O) btrfs
blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor sync_tx xor raid6_pq libcrc32c raid0 cdc_ether usbnet mii raid1 uas
usb_storage crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_eneric
ghash_clmulni_intel sfc sha256_ssse3 mtd ahci xhci_pci sha1_ssse3 tg3 libahci
[12158.396678] megaraid_sas mdio xhci_pci_renesas wmi aesni_intel crypto_simd
cryptd
[12158.501416] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: P W O
6.11.0-24-generic #24~24.04.1-Ubuntu
[12158.512627] Tainted: [P]=PROPRIETARY_MODULE, [W]=WARN, [O]=OOT_MODULE
The freeze affects some things but not others. My existing SSH
connection and tmux continue to work (mostly; tmux freezes
intermittently and *usually* recovers after a minute or so...though
eventually it seems to get stuck forever). New SSH connections do not
succeed; the TCP connection establishes and SSH starts to negotiate, but
it gets stuck during authentication. Some commands such as "ps aux"
freeze indefinitely, or freeze for a while. My serial console's getty
and the VGA console both stop responding entirely (no response to
pressing enter). The above warning only makes it to the serial console,
not VGA.
strace'ing "ps aux" shows that it freezes (seemingly forever) whilst
reading from procfs:
openat(AT_FDCWD, "/proc/4/stat", O_RDONLY) = 4
read(4,
PID 4 is some kernel thread but I'm not sure what.
Let me know if there's anything else I can usefully provide.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2107668
Title:
kernel 6.11.0-24-generic regression: freeze after minutes/hours;
timer_migration warning
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