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Date: Tue, 27 Oct 2020 12:13:07 +0100
From: Mike Galbraith <efault@....de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Hillf Danton <hdanton@...a.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Skeggs <bskeggs@...hat.com>
Subject: Re: kvm+nouveau induced lockdep gripe
On Tue, 2020-10-27 at 11:18 +0100, Sebastian Andrzej Siewior wrote:
> On 2020-10-27 11:14:34 [+0100], Mike Galbraith wrote:
> > On Tue, 2020-10-27 at 10:00 +0100, Sebastian Andrzej Siewior wrote:
> > > Let me try if I can figure out when this broke.
> >
> > My money is on...
> > 710da3c8ea7df (Juri Lelli 2019-07-19 16:00:00 +0200 5317) if (pi)
> > 710da3c8ea7df (Juri Lelli 2019-07-19 16:00:00 +0200 5318) cpuset_read_lock();
> > ...having just had an unnoticed consequence for nouveau.
>
> but that is over a year old and should be noticed in v5.4-RT.
Yup. Dang lazy sod nouveau users haven't been doing their broad
spectrum RT or threadirqs testing. This one hasn't anyway ;-)
[ 73.087508] ======================================================
[ 73.087508] WARNING: possible circular locking dependency detected
[ 73.087509] 5.4.72-rt40-rt #1 Tainted: G E
[ 73.087510] ------------------------------------------------------
[ 73.087510] libvirtd/1902 is trying to acquire lock:
[ 73.087511] ffff8b0f54b2f8d8 (&mm->mmap_sem#2){++++}, at: mpol_rebind_mm+0x1e/0x50
[ 73.087517]
but task is already holding lock:
[ 73.087518] ffffffff9d2a0430 (&cpuset_rwsem){++++}, at: cpuset_attach+0x38/0x390
[ 73.087520]
which lock already depends on the new lock.
[ 73.087521]
the existing dependency chain (in reverse order) is:
[ 73.087521]
-> #3 (&cpuset_rwsem){++++}:
[ 73.087523] cpuset_read_lock+0x39/0x100
[ 73.087524] __sched_setscheduler+0x476/0xb00
[ 73.087526] _sched_setscheduler+0x69/0x70
[ 73.087527] __kthread_create_on_node+0x122/0x180
[ 73.087531] kthread_create_on_node+0x37/0x40
[ 73.087532] setup_irq_thread+0x3c/0xa0
[ 73.087533] __setup_irq+0x4c3/0x760
[ 73.087535] request_threaded_irq+0xf8/0x160
[ 73.087535] nvkm_pci_oneinit+0x4c/0x70 [nouveau]
[ 73.087569] nvkm_subdev_init+0x60/0x1e0 [nouveau]
[ 73.087586] nvkm_device_init+0x10b/0x240 [nouveau]
[ 73.087611] nvkm_udevice_init+0x47/0x70 [nouveau]
[ 73.087636] nvkm_object_init+0x3d/0x180 [nouveau]
[ 73.087652] nvkm_ioctl_new+0x1a1/0x260 [nouveau]
[ 73.087667] nvkm_ioctl+0x10a/0x240 [nouveau]
[ 73.087682] nvif_object_init+0xbf/0x110 [nouveau]
[ 73.087697] nvif_device_init+0xe/0x50 [nouveau]
[ 73.087713] nouveau_cli_init+0x1ce/0x5a0 [nouveau]
[ 73.087739] nouveau_drm_device_init+0x54/0x7e0 [nouveau]
[ 73.087765] nouveau_drm_probe+0x1da/0x330 [nouveau]
[ 73.087791] local_pci_probe+0x42/0x90
[ 73.087793] pci_device_probe+0xe7/0x1a0
[ 73.087794] really_probe+0xf7/0x460
[ 73.087796] driver_probe_device+0x5d/0x130
[ 73.087797] device_driver_attach+0x4f/0x60
[ 73.087798] __driver_attach+0xa2/0x140
[ 73.087798] bus_for_each_dev+0x67/0x90
[ 73.087800] bus_add_driver+0x192/0x230
[ 73.087801] driver_register+0x5b/0xf0
[ 73.087801] do_one_initcall+0x56/0x3c4
[ 73.087803] do_init_module+0x5b/0x21d
[ 73.087805] load_module+0x1cd4/0x2340
[ 73.087806] __do_sys_finit_module+0xa7/0xe0
[ 73.087807] do_syscall_64+0x6c/0x270
[ 73.087808] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 73.087810]
-> #2 (&device->mutex){+.+.}:
[ 73.087811] _mutex_lock+0x28/0x40
[ 73.087813] nvkm_udevice_fini+0x21/0x70 [nouveau]
[ 73.087839] nvkm_object_fini+0xb8/0x210 [nouveau]
[ 73.087854] nvkm_object_fini+0x73/0x210 [nouveau]
[ 73.087869] nvkm_ioctl_del+0x7e/0xa0 [nouveau]
[ 73.087884] nvkm_ioctl+0x10a/0x240 [nouveau]
[ 73.087898] nvif_object_fini+0x49/0x60 [nouveau]
[ 73.087914] nvif_client_fini+0xe/0x40 [nouveau]
[ 73.087930] nouveau_cli_fini+0x78/0x90 [nouveau]
[ 73.087955] nouveau_drm_postclose+0xa3/0xd0 [nouveau]
[ 73.087981] drm_file_free.part.5+0x20c/0x2c0 [drm]
[ 73.087991] drm_release+0x4b/0x80 [drm]
[ 73.087997] __fput+0xd5/0x280
[ 73.087999] task_work_run+0x87/0xb0
[ 73.088001] exit_to_usermode_loop+0x13b/0x160
[ 73.088002] do_syscall_64+0x1be/0x270
[ 73.088003] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 73.088004]
-> #1 (&cli->lock){+.+.}:
[ 73.088006] _mutex_lock+0x28/0x40
[ 73.088007] nouveau_mem_fini+0x4a/0x70 [nouveau]
[ 73.088033] nv04_sgdma_unbind+0xe/0x20 [nouveau]
[ 73.088058] ttm_tt_unbind+0x1d/0x30 [ttm]
[ 73.088061] ttm_tt_destroy+0x13/0x60 [ttm]
[ 73.088063] ttm_bo_cleanup_memtype_use+0x32/0x80 [ttm]
[ 73.088066] ttm_bo_release+0x264/0x460 [ttm]
[ 73.088068] ttm_bo_vm_close+0x15/0x30 [ttm]
[ 73.088070] remove_vma+0x3e/0x70
[ 73.088072] __do_munmap+0x2d7/0x510
[ 73.088073] __vm_munmap+0x5b/0xa0
[ 73.088074] __x64_sys_munmap+0x27/0x30
[ 73.088075] do_syscall_64+0x6c/0x270
[ 73.088076] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 73.088077]
-> #0 (&mm->mmap_sem#2){++++}:
[ 73.088078] __lock_acquire+0x113f/0x1410
[ 73.088080] lock_acquire+0x93/0x230
[ 73.088081] down_write+0x3b/0x50
[ 73.088082] mpol_rebind_mm+0x1e/0x50
[ 73.088083] cpuset_attach+0x229/0x390
[ 73.088084] cgroup_migrate_execute+0x42c/0x450
[ 73.088086] cgroup_attach_task+0x267/0x3f0
[ 73.088086] __cgroup1_procs_write.constprop.20+0xe8/0x140
[ 73.088088] cgroup_file_write+0x7e/0x1a0
[ 73.088089] kernfs_fop_write+0x113/0x1b0
[ 73.088091] vfs_write+0xc1/0x1d0
[ 73.088092] ksys_write+0x87/0xc0
[ 73.088093] do_syscall_64+0x6c/0x270
[ 73.088094] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 73.088095]
other info that might help us debug this:
[ 73.088095] Chain exists of:
&mm->mmap_sem#2 --> &device->mutex --> &cpuset_rwsem
[ 73.088097] Possible unsafe locking scenario:
[ 73.088097] CPU0 CPU1
[ 73.088098] ---- ----
[ 73.088098] lock(&cpuset_rwsem);
[ 73.088099] lock(&device->mutex);
[ 73.088099] lock(&cpuset_rwsem);
[ 73.088100] lock(&mm->mmap_sem#2);
[ 73.088101]
*** DEADLOCK ***
[ 73.088101] 6 locks held by libvirtd/1902:
[ 73.088102] #0: ffff8b0f771f1ba0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x46/0x50
[ 73.088105] #1: ffff8b0cc7790658 (sb_writers#7){.+.+}, at: vfs_write+0x1af/0x1d0
[ 73.088107] #2: ffff8b0fa42762b8 (&of->mutex){+.+.}, at: kernfs_fop_write+0xde/0x1b0
[ 73.088110] #3: ffffffff9d29c578 (cgroup_mutex){+.+.}, at: cgroup_kn_lock_live+0xed/0x1d0
[ 73.088112] #4: ffffffff9d29c1b0 (cgroup_threadgroup_rwsem){++++}, at: cgroup_procs_write_start+0x4c/0x190
[ 73.088114] #5: ffffffff9d2a0430 (&cpuset_rwsem){++++}, at: cpuset_attach+0x38/0x390
[ 73.088115]
stack backtrace:
[ 73.088116] CPU: 6 PID: 1902 Comm: libvirtd Kdump: loaded Tainted: G E 5.4.72-rt40-rt #1
[ 73.088117] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/23/2013
[ 73.088118] Call Trace:
[ 73.088120] dump_stack+0x71/0x9b
[ 73.088122] check_noncircular+0x155/0x170
[ 73.088125] ? __lock_acquire+0x113f/0x1410
[ 73.088127] __lock_acquire+0x113f/0x1410
[ 73.088129] lock_acquire+0x93/0x230
[ 73.088130] ? mpol_rebind_mm+0x1e/0x50
[ 73.088133] down_write+0x3b/0x50
[ 73.088134] ? mpol_rebind_mm+0x1e/0x50
[ 73.088135] mpol_rebind_mm+0x1e/0x50
[ 73.088137] cpuset_attach+0x229/0x390
[ 73.088138] cgroup_migrate_execute+0x42c/0x450
[ 73.088140] ? rt_spin_unlock+0x5b/0xa0
[ 73.088142] cgroup_attach_task+0x267/0x3f0
[ 73.088145] ? __cgroup1_procs_write.constprop.20+0xe8/0x140
[ 73.088146] __cgroup1_procs_write.constprop.20+0xe8/0x140
[ 73.088148] cgroup_file_write+0x7e/0x1a0
[ 73.088150] kernfs_fop_write+0x113/0x1b0
[ 73.088152] vfs_write+0xc1/0x1d0
[ 73.088153] ksys_write+0x87/0xc0
[ 73.088155] do_syscall_64+0x6c/0x270
[ 73.088156] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 73.088157] RIP: 0033:0x7f6be8550deb
[ 73.088159] Code: 53 48 89 d5 48 89 f3 48 83 ec 18 48 89 7c 24 08 e8 5a fd ff ff 48 89 ea 41 89 c0 48 89 de 48 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 90 fd ff ff 48
[ 73.088160] RSP: 002b:00007f6bde6832f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[ 73.088161] RAX: ffffffffffffffda RBX: 00007f6bc80388b0 RCX: 00007f6be8550deb
[ 73.088161] RDX: 0000000000000004 RSI: 00007f6bc80388b0 RDI: 000000000000001f
[ 73.088162] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
[ 73.088162] R10: 0000000000000000 R11: 0000000000000293 R12: 00007f6bc80388b0
[ 73.088163] R13: 0000000000000000 R14: 000000000000001f R15: 0000000000000214
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