=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G L
-----------------------------
kernel/sched/core.c:9226 Illegal context switch in RCU-sched read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
locks held by kworker/u8:6/21780: 5, last CPU#1:
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: io_req_caches_free+0x19/0x30 io_uring/io_uring.c:2152
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2276 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x137/0x390 arch/x86/mm/physaddr.c:54
#4: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0 kernel/time/timer.c:1745
stack backtrace:
CPU: 1 UID: 0 PID: 21780 Comm: kworker/u8:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: iou_exit io_ring_exit_work
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6972
__might_resched+0xbb/0x4c0 kernel/sched/core.c:9226
__cancel_work_sync+0x6d/0x110 kernel/workqueue.c:4561
mmc_free_host+0x19/0x40 drivers/mmc/core/host.c:700
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 de 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 92 38 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 47 38 da
RSP: 0018:ffffc90003d1f750 EFLAGS: 00000296
RAX: f576e19dd32d9100 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000045151126 RSI: ffffffff8e69fc8a RDI: ffffffff8c6dad80
RBP: ffff888051d01f40 R08: ffffffff8179dd07 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: ffffffff8ed5c960
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid include/linux/mmzone.h:2276 [inline]
__virt_addr_valid+0x154/0x390 arch/x86/mm/physaddr.c:54
kasan_addr_to_slab+0xf/0x70 mm/kasan/common.c:47
kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6636
__io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2141
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2153
io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2356
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
BUG: sleeping function called from invalid context at kernel/workqueue.c:4561
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 21780, name: kworker/u8:6
preempt_count: 101, expected: 0
RCU nest depth: 0, expected: 0
locks held by kworker/u8:6/21780: 5, last CPU#1:
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: io_req_caches_free+0x19/0x30 io_uring/io_uring.c:2152
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2276 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x137/0x390 arch/x86/mm/physaddr.c:54
#4: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0 kernel/time/timer.c:1745
Preemption disabled at:
[] rcu_read_lock_sched include/linux/rcupdate.h:944 [inline]
[] pfn_valid include/linux/mmzone.h:2276 [inline]
[] __virt_addr_valid+0x130/0x390 arch/x86/mm/physaddr.c:54
CPU: 1 UID: 0 PID: 21780 Comm: kworker/u8:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: iou_exit io_ring_exit_work
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
__might_resched+0x36a/0x4c0 kernel/sched/core.c:9264
__cancel_work_sync+0x6d/0x110 kernel/workqueue.c:4561
mmc_free_host+0x19/0x40 drivers/mmc/core/host.c:700
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 de 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 92 38 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 47 38 da
RSP: 0018:ffffc90003d1f750 EFLAGS: 00000296
RAX: f576e19dd32d9100 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000045151126 RSI: ffffffff8e69fc8a RDI: ffffffff8c6dad80
RBP: ffff888051d01f40 R08: ffffffff8179dd07 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: ffffffff8ed5c960
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid include/linux/mmzone.h:2276 [inline]
__virt_addr_valid+0x154/0x390 arch/x86/mm/physaddr.c:54
kasan_addr_to_slab+0xf/0x70 mm/kasan/common.c:47
kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6636
__io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2141
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2153
io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2356
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G W L
-----------------------------
kernel/rcu/srcutree.c:1468 Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
locks held by kworker/u8:6/21780: 5, last CPU#1:
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: io_req_caches_free+0x19/0x30 io_uring/io_uring.c:2152
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2276 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x137/0x390 arch/x86/mm/physaddr.c:54
#4: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0 kernel/time/timer.c:1745
stack backtrace:
CPU: 1 UID: 0 PID: 21780 Comm: kworker/u8:6 Tainted: G W L syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: iou_exit io_ring_exit_work
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6972
__synchronize_srcu+0x157/0x2f0 kernel/rcu/srcutree.c:1464
wakeup_source_remove drivers/base/power/wakeup.c:201 [inline]
wakeup_source_unregister+0x129/0x3f0 drivers/base/power/wakeup.c:237
mmc_host_classdev_release+0x47/0x100 drivers/mmc/core/host.c:69
device_release+0xc4/0x1f0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x222/0x550 lib/kobject.c:737
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 de 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 92 38 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 47 38 da
RSP: 0018:ffffc90003d1f750 EFLAGS: 00000296
RAX: f576e19dd32d9100 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000045151126 RSI: ffffffff8e69fc8a RDI: ffffffff8c6dad80
RBP: ffff888051d01f40 R08: ffffffff8179dd07 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: ffffffff8ed5c960
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid include/linux/mmzone.h:2276 [inline]
__virt_addr_valid+0x154/0x390 arch/x86/mm/physaddr.c:54
kasan_addr_to_slab+0xf/0x70 mm/kasan/common.c:47
kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6636
__io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2141
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2153
io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2356
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
BUG: slee
BUG: sleeping function called from invalid context at kernel/rcu/srcutree.c:1472
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 21780, name: kworker/u8:6
preempt_count: 101, expected: 0
RCU nest depth: 0, expected: 0
locks held by kworker/u8:6/21780: 5, last CPU#1:
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#0: ffff88802033b940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
#1: ffffc90003d1fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#2: ffff888053d4e0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: io_req_caches_free+0x19/0x30 io_uring/io_uring.c:2152
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2276 [inline]
#3: ffffffff8ed5c960 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x137/0x390 arch/x86/mm/physaddr.c:54
#4: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0 kernel/time/timer.c:1745
Preemption disabled at:
[] rcu_read_lock_sched include/linux/rcupdate.h:944 [inline]
[] pfn_valid include/linux/mmzone.h:2276 [inline]
[] __virt_addr_valid+0x130/0x390 arch/x86/mm/physaddr.c:54
CPU: 1 UID: 0 PID: 21780 Comm: kworker/u8:6 Tainted: G W L syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: iou_exit io_ring_exit_work
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
__might_resched+0x36a/0x4c0 kernel/sched/core.c:9264
__synchronize_srcu+0x1a1/0x2f0 kernel/rcu/srcutree.c:1472
wakeup_source_remove drivers/base/power/wakeup.c:201 [inline]
wakeup_source_unregister+0x129/0x3f0 drivers/base/power/wakeup.c:237
mmc_host_classdev_release+0x47/0x100 drivers/mmc/core/host.c:69
device_release+0xc4/0x1f0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x222/0x550 lib/kobject.c:737
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 de 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 92 38 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 47 38 da
RSP: 0018:ffffc90003d1f750 EFLAGS: 00000296
RAX: f576e19dd32d9100 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000045151126 RSI: ffffffff8e69fc8a RDI: ffffffff8c6dad80
RBP: ffff888051d01f40 R08: ffffffff8179dd07 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: ffffffff8ed5c960
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid include/linux/mmzone.h:2276 [inline]
__virt_addr_valid+0x154/0x390 arch/x86/mm/physaddr.c:54
kasan_addr_to_slab+0xf/0x70 mm/kasan/common.c:47
kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6636
__io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2141
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2153
io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2356
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
ODEBUG: object ffffc90000a18a80 is NOT on stack ffffc90003d18000, but annotated.
------------[ cut here ]------------
1
WARNING: lib/debugobjects.c:672 at debug_object_is_on_stack lib/debugobjects.c:672 [inline], CPU#1: kworker/u8:6/21780
WARNING: lib/debugobjects.c:672 at lookup_object_or_alloc lib/debugobjects.c:705 [inline], CPU#1: kworker/u8:6/21780
WARNING: lib/debugobjects.c:672 at __debug_object_init+0x2c4/0x3c0 lib/debugobjects.c:798, CPU#1: kworker/u8:6/21780
Modules linked in:
CPU: 1 UID: 0 PID: 21780 Comm: kworker/u8:6 Tainted: G W L syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:672 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:705 [inline]
RIP: 0010:__debug_object_init+0x2c4/0x3c0 lib/debugobjects.c:798
Code: fe 06 cc 41 ff c7 44 89 3d 29 0f e8 15 48 c7 c1 80 b6 6d 8c 48 c7 c7 e0 b6 6d 8c 84 c0 48 0f 45 f9 48 89 de e8 6d 61 3c fc 90 <0f> 0b 90 e9 c0 fe ff ff e8 4f 1c 00 00 8b 05 c1 69 6d 0a 3b 05 bf
RSP: 0018:ffffc90000a189b8 EFLAGS: 00010046
RAX: 0000000000000050 RBX: ffffc90000a18a80 RCX: f576e19dd32d9100
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff888051d01f60 R08: 0000000000000100 R09: 1ffff920001430e4
R10: dffffc0000000000 R11: fffff520001430e5 R12: ffff8880213af0f8
R13: ffff888026a56dc8 R14: dffffc0000000000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124dc6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559a6fcd7168 CR3: 0000000071528000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000edb3 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__synchronize_srcu+0x1d5/0x2f0 kernel/rcu/srcutree.c:1475
wakeup_source_remove drivers/base/power/wakeup.c:201 [inline]
wakeup_source_unregister+0x129/0x3f0 drivers/base/power/wakeup.c:237
mmc_host_classdev_release+0x47/0x100 drivers/mmc/core/host.c:69
device_release+0xc4/0x1f0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x222/0x550 lib/kobject.c:737
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 de 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 92 38 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 47 38 da
RSP: 0018:ffffc90003d1f750 EFLAGS: 00000296
RAX: f576e19dd32d9100 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000045151126 RSI: ffffffff8e69fc8a RDI: ffffffff8c6dad80
RBP: ffff888051d01f40 R08: ffffffff8179dd07 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: ffffffff8ed5c960
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid include/linux/mmzone.h:2276 [inline]
__virt_addr_valid+0x154/0x390 arch/x86/mm/physaddr.c:54
kasan_addr_to_slab+0xf/0x70 mm/kasan/common.c:47
kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:541
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6636
__io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2141
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2153
io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2356
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
----------------
Code disassembly (best guess), 2 bytes skipped:
0: ff ljmp (bad)
1: e8 30 de 43 0a call 0xa43de36
6: f7 44 24 10 00 02 00 testl $0x200,0x10(%rsp)
d: 00
e: 0f 84 38 ff ff ff je 0xffffff4c
14: 65 48 8b 05 92 38 f2 mov %gs:0x11f23892(%rip),%rax # 0x11f238ae
1b: 11
1c: 48 3b 44 24 50 cmp 0x50(%rsp),%rax
21: 75 33 jne 0x56
23: fb sti
24: 48 83 c4 58 add $0x58,%rsp
* 28: 5b pop %rbx <-- trapping instruction
29: 41 5c pop %r12
2b: 41 5d pop %r13
2d: 41 5e pop %r14
2f: 41 5f pop %r15
31: 5d pop %rbp
32: c3 ret
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: cc int3
38: 48 rex.W
39: 8d .byte 0x8d
3a: 3d .byte 0x3d
3b: 47 38 da rex.RXB cmp %r11b,%r10b