Hi David/Matthew, We've been running some stress testing lately in Microsoft with Linux 6.4-rc4 kernel, and I've noticed some warnings of hangs with this stack trace. Can you please take a look and let me know what you think? This seems to be reproducing quite often on this test setup. So please let me know if there's more data you need to debug this. [Mon Jun 19 16:05:49 2023] INFO: task newstress:61476 blocked for more than 966 seconds. [Mon Jun 19 16:05:49 2023] Tainted: G OE 6.4.0-rc3-wkasan #5 [Mon Jun 19 16:05:49 2023] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Mon Jun 19 16:05:49 2023] task:newstress state:D stack:0 pid:61476 ppid:61160 flags:0x00000002 [Mon Jun 19 16:05:49 2023] Call Trace: [Mon Jun 19 16:05:49 2023] <TASK> [Mon Jun 19 16:05:49 2023] __schedule+0x782/0x2500 [Mon Jun 19 16:05:49 2023] ? __rcu_read_unlock+0x53/0x80 [Mon Jun 19 16:05:49 2023] ? __kasan_check_read+0x11/0x20 [Mon Jun 19 16:05:49 2023] ? __pfx___schedule+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __rcu_read_unlock+0x53/0x80 [Mon Jun 19 16:05:49 2023] ? cgroup_rstat_updated+0x82/0x250 [Mon Jun 19 16:05:49 2023] ? __kasan_check_write+0x14/0x30 [Mon Jun 19 16:05:49 2023] schedule+0x9b/0x150 [Mon Jun 19 16:05:49 2023] io_schedule+0x70/0xc0 [Mon Jun 19 16:05:49 2023] folio_wait_bit_common+0x232/0x550 [Mon Jun 19 16:05:49 2023] ? __pfx_folio_wait_bit_common+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __filemap_remove_folio+0x177/0x3a0 [Mon Jun 19 16:05:49 2023] ? __pfx_wake_page_function+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __pfx_workingset_update_node+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __pfx__raw_spin_lock_irq+0x10/0x10 [Mon Jun 19 16:05:49 2023] __folio_lock+0x17/0x30 [Mon Jun 19 16:05:49 2023] invalidate_inode_pages2_range+0x5b4/0x840 [Mon Jun 19 16:05:49 2023] ? __pfx_invalidate_inode_pages2_range+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? cifs_dentry_needs_reval+0x27f/0x390 [cifs] [Mon Jun 19 16:05:49 2023] ? cifs_revalidate_dentry_attr+0xa4/0x650 [cifs] [Mon Jun 19 16:05:49 2023] invalidate_inode_pages2+0x17/0x30 [Mon Jun 19 16:05:49 2023] cifs_invalidate_mapping+0x57/0x90 [cifs] [Mon Jun 19 16:05:49 2023] cifs_revalidate_mapping+0xd5/0x130 [cifs] [Mon Jun 19 16:05:49 2023] cifs_revalidate_dentry+0x32/0x40 [cifs] [Mon Jun 19 16:05:49 2023] cifs_d_revalidate+0xa3/0x220 [cifs] [Mon Jun 19 16:05:49 2023] lookup_fast+0xfc/0x1c0 [Mon Jun 19 16:05:49 2023] walk_component+0x39/0x240 [Mon Jun 19 16:05:49 2023] path_lookupat+0xb2/0x2f0 [Mon Jun 19 16:05:49 2023] filename_lookup+0x16f/0x340 [Mon Jun 19 16:05:49 2023] ? __pfx_filename_lookup+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __kasan_slab_alloc+0x9d/0xa0 [Mon Jun 19 16:05:49 2023] ? kmem_cache_alloc+0x176/0x3a0 [Mon Jun 19 16:05:49 2023] ? getname_flags.part.0+0x3c/0x260 [Mon Jun 19 16:05:49 2023] ? getname_flags+0x56/0x90 [Mon Jun 19 16:05:49 2023] ? __x64_sys_statx+0x9b/0xf0 [Mon Jun 19 16:05:49 2023] ? do_syscall_64+0x5c/0x90 [Mon Jun 19 16:05:49 2023] ? entry_SYSCALL_64_after_hwframe+0x72/0xdc [Mon Jun 19 16:05:49 2023] ? __rcu_read_unlock+0x53/0x80 [Mon Jun 19 16:05:49 2023] vfs_statx+0xf4/0x260 [Mon Jun 19 16:05:49 2023] ? __pfx_vfs_statx+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __kasan_check_write+0x14/0x30 [Mon Jun 19 16:05:49 2023] ? lockref_get+0xdb/0x170 [Mon Jun 19 16:05:49 2023] ? __pfx_lockref_get+0x10/0x10 [Mon Jun 19 16:05:49 2023] do_statx+0x99/0x100 [Mon Jun 19 16:05:49 2023] ? __pfx_do_statx+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? __pfx_do_statx+0x10/0x10 [Mon Jun 19 16:05:49 2023] ? _raw_spin_unlock+0xe/0x40 [Mon Jun 19 16:05:49 2023] ? audit_alloc_name+0x1b0/0x1e0 [Mon Jun 19 16:05:49 2023] ? __audit_getname+0x98/0xb0 [Mon Jun 19 16:05:49 2023] ? getname_flags.part.0+0x10f/0x260 [Mon Jun 19 16:05:49 2023] ? getname_flags+0x56/0x90 [Mon Jun 19 16:05:49 2023] __x64_sys_statx+0xb3/0xf0 [Mon Jun 19 16:05:49 2023] do_syscall_64+0x5c/0x90 [Mon Jun 19 16:05:49 2023] ? do_syscall_64+0x69/0x90 [Mon Jun 19 16:05:49 2023] entry_SYSCALL_64_after_hwframe+0x72/0xdc [Mon Jun 19 16:05:49 2023] RIP: 0033:0x7f0e14f121ee [Mon Jun 19 16:05:49 2023] RSP: 002b:00007f0ccf7e3668 EFLAGS: 00000206 ORIG_RAX: 000000000000014c [Mon Jun 19 16:05:49 2023] RAX: ffffffffffffffda RBX: 00007f0ccf7e3b30 RCX: 00007f0e14f121ee [Mon Jun 19 16:05:49 2023] RDX: 0000000000002100 RSI: 00007f0d8073da80 RDI: 0000000000000000 [Mon Jun 19 16:05:49 2023] RBP: 00007f0ccf7e3a90 R08: 00007f0ccf7e3950 R09: 00007f0d8073da80 [Mon Jun 19 16:05:49 2023] R10: 0000000000000fff R11: 0000000000000206 R12: 00007f0ccf7e37a0 [Mon Jun 19 16:05:49 2023] R13: 00007f0d800061d0 R14: 00007f0ccf7e3740 R15: 00007f0ccf7e3770 [Mon Jun 19 16:05:49 2023] </TASK> -- Regards, Shyam
