------------[ cut here ]------------ WARNING: CPU: 0 PID: 6258 at kernel/workqueue.c:2322 current_wq_worker kernel/workqueue_internal.h:69 [inline] WARNING: CPU: 0 PID: 6258 at kernel/workqueue.c:2322 is_chained_work kernel/workqueue.c:2264 [inline] WARNING: CPU: 0 PID: 6258 at kernel/workqueue.c:2322 __queue_work+0xdec/0x12b0 kernel/workqueue.c:2321 Modules linked in: CPU: 0 PID: 6258 Comm: syz-executor.0 Not tainted 6.9.0-rc3-syzkaller-gb5d2afe8745b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __queue_work+0xdec/0x12b0 kernel/workqueue_internal.h:69 lr : current_wq_worker kernel/workqueue_internal.h:69 [inline] lr : is_chained_work kernel/workqueue.c:2264 [inline] lr : __queue_work+0xdec/0x12b0 kernel/workqueue.c:2321 sp : ffff800080007b70 x29: ffff800080007bb0 x28: 1fffe0001d1273c9 x27: dfff800000000000 x26: dfff800000000000 x25: ffff0000d7b45800 x24: 0000000000000008 x23: ffff0000d7b459c0 x22: ffff0000e8939e48 x21: 0000000000000100 x20: ffff0000e8939e40 x19: ffff0000ea0a8c10 x18: ffff80009a1e6f40 x17: ffff800124ffb000 x16: ffff80008ae71340 x15: 0000000000000002 x14: ffff80008ee80668 x13: dfff800000000000 x12: 000000003c3f453b x11: 00000000ea671ab7 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000e8939e40 x7 : ffff80008043f4a0 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008d5eee80 x2 : ffff0000ea0a8c10 x1 : 0000000000000100 x0 : 0000000000000000 Call trace: current_wq_worker kernel/workqueue_internal.h:69 [inline] is_chained_work kernel/workqueue.c:2264 [inline] __queue_work+0xdec/0x12b0 kernel/workqueue.c:2321 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:2529 call_timer_fn+0x1b4/0x93c kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1839 [inline] __run_timers kernel/time/timer.c:2418 [inline] __run_timer_base+0x59c/0x7b4 kernel/time/timer.c:2429 run_timer_base kernel/time/timer.c:2438 [inline] run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2448 __do_softirq+0x2e4/0xd2c kernel/softirq.c:554 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:633 irq_exit_rcu+0x14/0x84 kernel/softirq.c:645 __el1_irq arch/arm64/kernel/entry-common.c:537 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:551 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irq+0x34/0x80 kernel/locking/spinlock.c:202 drain_workqueue+0x160/0x32c kernel/workqueue.c:4116 hci_dev_close_sync+0x384/0xf70 net/bluetooth/hci_sync.c:5144 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_unregister_dev+0x1e4/0x4a8 net/bluetooth/hci_core.c:2773 vhci_release+0x7c/0xd0 drivers/bluetooth/hci_vhci.c:674 __fput+0x30c/0x738 fs/file_table.c:422 ____fput+0x20/0x30 fs/file_table.c:450 task_work_run+0x230/0x2e0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x4e4/0x1ac8 kernel/exit.c:878 do_group_exit+0x194/0x22c kernel/exit.c:1027 get_signal+0x1414/0x1530 kernel/signal.c:2911 do_signal+0x238/0x3e8c arch/arm64/kernel/signal.c:1308 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 178431 hardirqs last enabled at (178430): [] __do_softirq+0x1bc/0xd2c kernel/softirq.c:538 hardirqs last disabled at (178431): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (178431): [] _raw_spin_lock_irq+0x28/0x70 kernel/locking/spinlock.c:170 softirqs last enabled at (176876): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (176876): [] __do_softirq+0xb10/0xd2c kernel/softirq.c:583 softirqs last disabled at (178429): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ------------[ cut here ]------------ WARNING: CPU: 0 PID: 15 at include/linux/backing-dev.h:254 inode_to_wb include/linux/backing-dev.h:251 [inline] WARNING: CPU: 0 PID: 15 at include/linux/backing-dev.h:254 __folio_end_writeback+0x754/0x94c mm/page-writeback.c:3014 Modules linked in: CPU: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G W 6.9.0-rc3-syzkaller-gb5d2afe8745b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : inode_to_wb include/linux/backing-dev.h:251 [inline] pc : __folio_end_writeback+0x754/0x94c mm/page-writeback.c:3014 lr : inode_to_wb include/linux/backing-dev.h:251 [inline] lr : __folio_end_writeback+0x754/0x94c mm/page-writeback.c:3014 sp : ffff800093c57920 x29: ffff800093c57940 x28: dfff800000000000 x27: 05ffe00000008126 x26: 1fffffbff86b9ac8 x25: 0000000000000000 x24: ffff0000c154ede8 x23: 0000000000000003 x22: ffff0000dab402a0 x21: ffff0000dab402a8 x20: 0000000000000001 x19: fffffdffc35cd640 x18: 1fffe000367b9996 x17: ffff80008ee7d000 x16: ffff800080332544 x15: 0000000000000003 x14: 1ffff0001278af0c x13: 0000000000000000 x12: 0000000000000000 x11: ffff70001278af0f x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000c19cbc80 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : 0000000000000010 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: inode_to_wb include/linux/backing-dev.h:251 [inline] __folio_end_writeback+0x754/0x94c mm/page-writeback.c:3014 folio_end_writeback+0x170/0x424 mm/filemap.c:1608 end_buffer_async_write+0x2c0/0x404 fs/buffer.c:411 end_bio_bh_io_sync+0xb0/0x194 fs/buffer.c:2756 bio_endio+0x770/0x7b4 block/bio.c:1603 req_bio_endio block/blk-mq.c:786 [inline] blk_update_request+0x4ac/0xdf0 block/blk-mq.c:931 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1054 lo_complete_rq+0x188/0x2f4 drivers/block/loop.c:366 blk_complete_reqs block/blk-mq.c:1129 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1134 __do_softirq+0x2e4/0xd2c kernel/softirq.c:554 run_ksoftirqd+0x6c/0x14c kernel/softirq.c:924 smpboot_thread_fn+0x4b0/0x90c kernel/smpboot.c:164 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 irq event stamp: 328073 hardirqs last enabled at (328072): [] folio_memcg_lock+0xec/0x1d8 mm/memcontrol.c:2207 hardirqs last disabled at (328073): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (328073): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (328062): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (328062): [] __do_softirq+0xb10/0xd2c kernel/softirq.c:583 softirqs last disabled at (328067): [] run_ksoftirqd+0x6c/0x14c kernel/softirq.c:924 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun TCP: request_sock_subflow_v4: Possible SYN flooding on port [::]:20002. Sending cookies. TCP: request_sock_TCP: Possible SYN flooding on port [::]:2. Sending cookies.