BUG: sleeping function called from invalid context at kernel/workqueue.c:3414 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5776, name: syz-executor preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 2 locks held by syz-executor/5776: #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x22/0x2b0 mm/page_ext.c:508 #1: ffffc900001f0be0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd2/0x540 kernel/time/timer.c:1698 Preemption disabled at: [] unwind_next_frame+0xb7/0x2990 arch/x86/kernel/unwind_orc.c:479 CPU: 1 PID: 5776 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 __might_resched+0x48d/0x5f0 kernel/sched/core.c:10212 start_flush_work kernel/workqueue.c:3414 [inline] __flush_work+0x10f/0xac0 kernel/workqueue.c:3474 __cancel_work_timer+0x3f8/0x560 kernel/workqueue.c:3562 mmc_free_host+0x19/0x30 drivers/mmc/core/host.c:694 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x570/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:unwind_next_frame+0x633/0x2990 arch/x86/kernel/unwind_orc.c:505 Code: 74 78 e8 a0 c7 4b 00 4c 8d 73 04 4c 8d 63 05 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e0 1c 00 00 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ec 1c 00 00 45 0f b6 76 01 41 83 e6 07 RSP: 0018:ffffc900045ff238 EFLAGS: 00000a07 RAX: 1ffffffff1e27481 RBX: ffffffff8f13a408 RCX: ffff888030f50000 RDX: 0000000000000000 RSI: ffffffff81760e29 RDI: ffffffff81760e6d RBP: ffffc900045ff358 R08: ffffc900045ff3d0 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8f13a40d R13: ffffc900045ff308 R14: ffffffff8f13a40c R15: dffffc0000000000 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 save_stack+0x125/0x230 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505 release_pages+0x208a/0x2300 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026 shmem_truncate_range mm/shmem.c:1135 [inline] shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264 evict+0x4b7/0x8a0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfe/0x1e0 fs/dcache.c:918 __fput+0x5b2/0x940 fs/file_table.c:426 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f436519f257 Code: a2 c7 05 9c 44 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdb30ef708 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f436523445c RCX: 00007f436519f257 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdb30ef7c0 RBP: 00007ffdb30ef7c0 R08: 00007ffdb30f07c0 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdb30f0850 R13: 00007f436523445c R14: 000000000001e347 R15: 00007ffdb30f0890 ============================= WARNING: suspicious RCU usage syzkaller #0 Tainted: G W ----------------------------- kernel/rcu/srcutree.c:1377 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 2 locks held by syz-executor/5776: #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x22/0x2b0 mm/page_ext.c:508 #1: ffffc900001f0be0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd2/0x540 kernel/time/timer.c:1698 stack backtrace: CPU: 1 PID: 5776 Comm: syz-executor Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x1e1/0x300 kernel/locking/lockdep.c:6731 __synchronize_srcu+0x150/0x3d0 kernel/rcu/srcutree.c:1373 wakeup_source_remove drivers/base/power/wakeup.c:198 [inline] wakeup_source_unregister+0x116/0x190 drivers/base/power/wakeup.c:242 mmc_host_classdev_release+0x47/0x100 drivers/mmc/core/host.c:77 device_release+0xbc/0x1e0 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+0x21b/0x450 lib/kobject.c:737 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x570/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:unwind_next_frame+0x633/0x2990 arch/x86/kernel/unwind_orc.c:505 Code: 74 78 e8 a0 c7 4b 00 4c 8d 73 04 4c 8d 63 05 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e0 1c 00 00 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ec 1c 00 00 45 0f b6 76 01 41 83 e6 07 RSP: 0018:ffffc900045ff238 EFLAGS: 00000a07 RAX: 1ffffffff1e27481 RBX: ffffffff8f13a408 RCX: ffff888030f50000 RDX: 0000000000000000 RSI: ffffffff81760e29 RDI: ffffffff81760e6d RBP: ffffc900045ff358 R08: ffffc900045ff3d0 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8f13a40d R13: ffffc900045ff308 R14: ffffffff8f13a40c R15: dffffc0000000000 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 save_stack+0x125/0x230 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505 release_pages+0x208a/0x2300 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026 shmem_truncate_range mm/shmem.c:1135 [inline] shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264 evict+0x4b7/0x8a0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfe/0x1e0 fs/dcache.c:918 __fput+0x5b2/0x940 fs/file_table.c:426 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f436519f257 Code: a2 c7 05 9c 44 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdb30ef708 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f436523445c RCX: 00007f436519f257 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdb30ef7c0 RBP: 00007ffdb30ef7c0 R08: 00007ffdb30f07c0 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdb30f0850 R13: 00007f436523445c R14: 000000000001e347 R15: 00007ffdb30f0890 BUG: sleeping function called from invalid context at kernel/rcu/srcutree.c:1381 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5776, name: syz-executor preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 2 locks held by syz-executor/5776: #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x22/0x2b0 mm/page_ext.c:508 #1: ffffc900001f0be0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd2/0x540 kernel/time/timer.c:1698 Preemption disabled at: [] unwind_next_frame+0xb7/0x2990 arch/x86/kernel/unwind_orc.c:479 CPU: 1 PID: 5776 Comm: syz-executor Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 __might_resched+0x48d/0x5f0 kernel/sched/core.c:10212 __synchronize_srcu+0x197/0x3d0 kernel/rcu/srcutree.c:1381 wakeup_source_remove drivers/base/power/wakeup.c:198 [inline] wakeup_source_unregister+0x116/0x190 drivers/base/power/wakeup.c:242 mmc_host_classdev_release+0x47/0x100 drivers/mmc/core/host.c:77 device_release+0xbc/0x1e0 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+0x21b/0x450 lib/kobject.c:737 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x570/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:unwind_next_frame+0x633/0x2990 arch/x86/kernel/unwind_orc.c:505 Code: 74 78 e8 a0 c7 4b 00 4c 8d 73 04 4c 8d 63 05 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e0 1c 00 00 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ec 1c 00 00 45 0f b6 76 01 41 83 e6 07 RSP: 0018:ffffc900045ff238 EFLAGS: 00000a07 RAX: 1ffffffff1e27481 RBX: ffffffff8f13a408 RCX: ffff888030f50000 RDX: 0000000000000000 RSI: ffffffff81760e29 RDI: ffffffff81760e6d RBP: ffffc900045ff358 R08: ffffc900045ff3d0 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8f13a40d R13: ffffc900045ff308 R14: ffffffff8f13a40c R15: dffffc0000000000 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 save_stack+0x125/0x230 mm/page_owner.c:128 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505 release_pages+0x208a/0x2300 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026 shmem_truncate_range mm/shmem.c:1135 [inline] shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264 evict+0x4b7/0x8a0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfe/0x1e0 fs/dcache.c:918 __fput+0x5b2/0x940 fs/file_table.c:426 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f436519f257 Code: a2 c7 05 9c 44 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdb30ef708 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f436523445c RCX: 00007f436519f257 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdb30ef7c0 RBP: 00007ffdb30ef7c0 R08: 00007ffdb30f07c0 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdb30f0850 R13: 00007f436523445c R14: 000000000001e347 R15: 00007ffdb30f0890 ODEBUG: object ffffc900001f09c0 is NOT on stack ffffc900045f8000, but annotated. ====================================================== ---------------- Code disassembly (best guess): 0: 74 78 je 0x7a 2: e8 a0 c7 4b 00 call 0x4bc7a7 7: 4c 8d 73 04 lea 0x4(%rbx),%r14 b: 4c 8d 63 05 lea 0x5(%rbx),%r12 f: 4c 89 f0 mov %r14,%rax 12: 48 c1 e8 03 shr $0x3,%rax 16: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax 1b: 84 c0 test %al,%al 1d: 0f 85 e0 1c 00 00 jne 0x1d03 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 ec 1c 00 00 jne 0x1d23 37: 45 0f b6 76 01 movzbl 0x1(%r14),%r14d 3c: 41 83 e6 07 and $0x7,%r14d