A server hangs or crashes with a blocked task message and call trace involving vxfs functions - A known VxFS bug causing an infinite loop in vx_write1_fast()

Issue

• The server hangs or crashes (when hung_task_panic is enabled) with a blocked task message and call trace involving vxfs functions:

INFO: task getcap:2329406 blocked for more than 122 seconds.
      Tainted: P           OE     -------  ---  5.14.0-570.28.1.el9_6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:getcap          state:D stack:0     pid:2329406 tgid:2329406 ppid:2329405 flags:0x00000002
Call Trace:
 <TASK>
 __schedule+0x229/0x4a0
 schedule+0x2e/0xb0
 vx_svar_sleep_unlock+0x65/0xd0 [vxfs]
 ? __pfx_vx_wq_wakeup_function+0x10/0x10 [vxfs]
 vx_rwsleep_rec_lock+0x3e/0xe0 [vxfs]
 vx_recsmp_rangelock+0x14/0x30 [vxfs]
 vx_linux_do_getxattr+0x175/0x420 [vxfs]
 ? cred_has_capability.isra.0+0x78/0x130
 ? packet_setsockopt+0x77c/0xb70
 ? vx_daccess.constprop.0+0x6c/0x2a0 [vxfs]
 ? security_capable+0x7f/0x130
 ? avc_has_perm_noaudit+0x94/0x110
 vx_linux_getxattr_int+0xa6/0x140 [vxfs]
 vx_linux_getxattr_v2+0xee/0x110 [vxfs]
 __vfs_getxattr+0x7b/0xb0
 get_vfs_caps_from_disk+0x6e/0x1e0
 ? path_init+0x1ea/0x3f0
 audit_copy_inode+0x99/0xd0
 filename_lookup+0x17b/0x1d0
 ? cap_inode_getsecurity+0xec/0x310
 ? path_get+0x11/0x30
 vfs_statx+0x82/0x160
 vfs_fstatat+0x54/0x70
 __do_sys_newfstatat+0x26/0x60
 ? getxattr+0x8d/0xc0
 ? auditd_test_task+0x3c/0x50
 ? __audit_syscall_entry+0xef/0x140
 ? syscall_trace_enter.constprop.0+0x126/0x1a0
 do_syscall_64+0x5c/0xe0
 ? audit_alloc_name+0x138/0x150
 ? __audit_filter_op+0xa5/0xf0
 ? mntput_no_expire+0x4a/0x250
 ? audit_reset_context.part.0.constprop.0+0x273/0x2e0
 ? syscall_exit_work+0x103/0x130
 ? syscall_exit_to_user_mode+0x19/0x40
 ? do_syscall_64+0x6b/0xe0
 ? __audit_filter_op+0xa5/0xf0
 ? fpregs_restore_userregs+0x47/0xd0
 ? exit_to_user_mode_prepare+0xef/0x100
 ? syscall_exit_to_user_mode+0x19/0x40
 ? do_syscall_64+0x6b/0xe0
 ? audit_alloc_name+0x138/0x150
 ? __audit_filter_op+0xa5/0xf0
 ? mntput_no_expire+0x4a/0x250
 ? audit_reset_context.part.0.constprop.0+0x273/0x2e0
 ? syscall_exit_work+0x103/0x130
 ? syscall_exit_to_user_mode+0x19/0x40
 ? do_syscall_64+0x6b/0xe0
 ? do_syscall_64+0x6b/0xe0
 ? syscall_exit_to_user_mode+0x19/0x40
 ? do_syscall_64+0x6b/0xe0
 ? do_syscall_64+0x6b/0xe0
 ? sysvec_apic_timer_interrupt+0x3c/0x90
 entry_SYSCALL_64_after_hwframe+0x78/0x80
RIP: 0033:0x7f06436fd4fe
RSP: 002b:00007ffe95656ad8 EFLAGS: 00000206 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffe956570b0 RCX: 00007f06436fd4fe
RDX: 00007ffe95656af0 RSI: 0000556ca0a5e253 RDI: 0000000000000006
RBP: 0000556ca0a5e253 R08: 0000556ca0a402e0 R09: 0000556ca0a38010
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe95656af0
R13: 00007ffe95656bf0 R14: 0000556ca0a414c0 R15: 00000000000000a0
 </TASK>
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 43 PID: 361 Comm: khungtaskd Kdump: loaded Tainted: P           OE     -------  ---  5.14.0-570.28.1.el9_6.x86_64 #1
Hardware name: Dell Inc. PowerEdge R760/0024FG, BIOS 2.6.5 07/11/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x34/0x48
 panic+0x107/0x2bb
 check_hung_uninterruptible_tasks.cold+0xc/0xc
 ? __pfx_watchdog+0x10/0x10
 watchdog+0x9a/0xa0
 kthread+0xdd/0x100
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x29/0x50
 </TASK>