* [syzbot] [serial?] possible deadlock in __refill_objects_node
@ 2026-08-01 0:03 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-08-01 0:03 UTC (permalink / raw)
To: gregkh, jirislaby, linux-kernel, linux-serial, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=174625b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=5cd85bfb5621212d8c2f
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-11028ab6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e2be78614a29/vmlinux-11028ab6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/301a11d315af/bzImage-11028ab6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5cd85bfb5621212d8c2f@syzkaller.appspotmail.com
=============================================================================
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G L
------------------------------------------------------
syz.5.2538/15441 is trying to acquire lock:
ffffffff8eaf40e0 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2026 [inline]
ffffffff8eaf40e0 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x4c0/0x6b0 kernel/printk/printk.c:2478
but task is already holding lock:
ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:372 [inline]
ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:8009 [inline]
ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x10c/0x330 mm/slub.c:8058
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&n->list_lock){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
get_partial_node_bulk mm/slub.c:3744 [inline]
__refill_objects_node+0x120/0xaa0 mm/slub.c:7169
refill_objects+0x58/0x410 mm/slub.c:7297
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675
alloc_from_pcs mm/slub.c:4773 [inline]
slab_alloc_node mm/slub.c:4905 [inline]
__do_kmalloc_node mm/slub.c:5333 [inline]
__kmalloc_noprof+0x66d/0x820 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
tty_buffer_alloc+0x29f/0x320 drivers/tty/tty_buffer.c:187
__tty_buffer_request_room+0x129/0x2c0 drivers/tty/tty_buffer.c:280
__tty_insert_flip_string_flags+0xdb/0x3f0 drivers/tty/tty_buffer.c:316
tty_insert_flip_string_fixed_flag include/linux/tty_flip.h:35 [inline]
tty_insert_flip_string include/linux/tty_flip.h:83 [inline]
tty_insert_flip_string_and_push_buffer+0x9c/0x230 drivers/tty/tty_buffer.c:565
pty_write+0xd2/0x100 drivers/tty/pty.c:116
n_tty_write+0xa9e/0x1160 drivers/tty/n_tty.c:2388
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&port->lock#2){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
class_spinlock_irqsave_constructor include/linux/spinlock.h:619 [inline]
tty_port_tty_get+0x21/0x100 drivers/tty/tty_port.c:322
class_tty_port_tty_constructor include/linux/tty_port.h:293 [inline]
tty_port_default_wakeup+0x15/0x60 drivers/tty/tty_port.c:66
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723
serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837
serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline]
serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867
serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:790 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
uart_write+0x29d/0xb20 drivers/tty/serial/serial_core.c:630
process_output_block drivers/tty/n_tty.c:557 [inline]
n_tty_write+0x431/0x1160 drivers/tty/n_tty.c:2366
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
tty_write drivers/tty/tty_io.c:1102 [inline]
redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
serial8250_console_write+0x177/0x1a50 drivers/tty/serial/8250/8250_port.c:3344
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
console_init+0x3d5/0x5b0 kernel/printk/printk.c:4407
start_kernel+0x314/0x490 init/main.c:1112
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x158
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__slab_bug+0x4f/0xb0 mm/slub.c:1144
slab_bug+0x5d/0x80 mm/slub.c:1155
list_slab_objects mm/slub.c:7978 [inline]
free_partial mm/slub.c:8015 [inline]
__kmem_cache_shutdown.cold+0x39/0x177 mm/slub.c:8058
kmem_cache_destroy mm/slab_common.c:569 [inline]
kmem_cache_destroy+0x73/0x190 mm/slab_common.c:527
virtio_gpu_free_vbufs+0x38/0x80 drivers/gpu/drm/virtio/virtgpu_vq.c:86
virtio_gpu_release+0x5c/0x1c0 drivers/gpu/drm/virtio/virtgpu_kms.c:312
drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xbd/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &port->lock#2 --> &n->list_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&n->list_lock);
lock(&port->lock#2);
lock(&n->list_lock);
lock(console_owner);
*** DEADLOCK ***
9 locks held by syz.5.2538/15441:
#0: ffff88805ac12ef0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff88802f138450 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffff888026b2d480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
#3: ffffffff8f86c760 (pci_rescan_remove_lock){+.+.}-{4:4}, at: pci_stop_and_remove_bus_device_locked+0x12/0x20 drivers/pci/remove.c:135
#4: ffff8880231301f8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
#4: ffff8880231301f8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
#4: ffff8880231301f8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb2/0x620 drivers/base/dd.c:1369
#5: ffff88802629b1b0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
#5: ffff88802629b1b0 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline]
#5: ffff88802629b1b0 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb2/0x620 drivers/base/dd.c:1369
#6: ffffffff8ea7a230 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy mm/slab_common.c:556 [inline]
#6: ffffffff8ea7a230 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x4b/0x190 mm/slab_common.c:527
#7: ffffffff8ed88200 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy mm/slab_common.c:557 [inline]
#7: ffffffff8ed88200 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy+0x59/0x190 mm/slab_common.c:527
#8: ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:372 [inline]
#8: ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:8009 [inline]
#8: ffff888028139618 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x10c/0x330 mm/slub.c:8058
stack backtrace:
CPU: 2 UID: 0 PID: 15441 Comm: syz.5.2538 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__slab_bug+0x4f/0xb0 mm/slub.c:1144
slab_bug+0x5d/0x80 mm/slub.c:1155
list_slab_objects mm/slub.c:7978 [inline]
free_partial mm/slub.c:8015 [inline]
__kmem_cache_shutdown.cold+0x39/0x177 mm/slub.c:8058
kmem_cache_destroy mm/slab_common.c:569 [inline]
kmem_cache_destroy+0x73/0x190 mm/slab_common.c:527
virtio_gpu_free_vbufs+0x38/0x80 drivers/gpu/drm/virtio/virtgpu_vq.c:86
virtio_gpu_release+0x5c/0x1c0 drivers/gpu/drm/virtio/virtgpu_kms.c:312
drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xbd/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8bea79df99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8beb5fc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8beaa25fa0 RCX: 00007f8bea79df99
RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000004
RBP: 00007f8bea834ec4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8beaa26038 R14: 00007f8beaa25fa0 R15: 00007ffc98064e98
</TASK>
BUG virtio-gpu-vbufs (Tainted: G L ): Objects remaining on __kmem_cache_shutdown()
-----------------------------------------------------------------------------
Object 0xffff88803d222000 @offset=0
Object 0xffff88803d222118 @offset=280
Object 0xffff88803d222230 @offset=560
Object 0xffff88803d222348 @offset=840
Object 0xffff88803d222460 @offset=1120
Object 0xffff88803d222578 @offset=1400
Object 0xffff88803d222690 @offset=1680
Object 0xffff88803d2227a8 @offset=1960
Slab 0xffffea0000f48880 objects=29 used=8 fp=0xffff88803d2228c0 flags=0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
------------[ cut here ]------------
1
WARNING: mm/slub.c:1244 at __slab_err+0x15/0x20 mm/slub.c:1244, CPU#2: syz.5.2538/15441
Modules linked in:
CPU: 2 UID: 0 PID: 15441 Comm: syz.5.2538 Tainted: G B L syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__slab_err+0x15/0x20 mm/slub.c:1244
Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 5b fd ff ff be 01 00 00 00 bf 05 00 00 00 e8 dc ba a2 00 90 <0f> 0b 90 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004e3f738 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffc90004e3f788 RCX: ffffffff81c709af
RDX: ffff88805bd02540 RSI: ffffffff81c709bd RDI: ffff88805bd02540
RBP: ffff888028139618 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000062616c53 R12: 0000000000001ea0
R13: ffff88803d223fb8 R14: ffff888028139600 R15: ffffea0000f48880
FS: 00007f8beb5fc6c0(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005605bceb4300 CR3: 0000000037c15000 CR4: 0000000000352ef0
Call Trace:
<TASK>
list_slab_objects mm/slub.c:7994 [inline]
free_partial mm/slub.c:8015 [inline]
__kmem_cache_shutdown.cold+0x16e/0x177 mm/slub.c:8058
kmem_cache_destroy mm/slab_common.c:569 [inline]
kmem_cache_destroy+0x73/0x190 mm/slab_common.c:527
virtio_gpu_free_vbufs+0x38/0x80 drivers/gpu/drm/virtio/virtgpu_vq.c:86
virtio_gpu_release+0x5c/0x1c0 drivers/gpu/drm/virtio/virtgpu_kms.c:312
drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xbd/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8bea79df99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8beb5fc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8beaa25fa0 RCX: 00007f8bea79df99
RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000004
RBP: 00007f8bea834ec4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8beaa26038 R14: 00007f8beaa25fa0 R15: 00007ffc98064e98
</TASK>
---
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2026-08-01 0:03 [syzbot] [serial?] possible deadlock in __refill_objects_node syzbot
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