sd 1:0:0:1: [sdc] Assuming drive cache: write through ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u8:2/35 is trying to acquire lock: ffff888029196120 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_mq_init_sched+0x42b/0x640 block/blk-mq-sched.c:473 but task is already holding lock: ffff8880291958e8 (&q->q_usage_counter(queue)#55){++++}-{0:0}, at: add_disk_fwnode+0x113/0x1300 block/genhd.c:413 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&q->q_usage_counter(queue)#55){++++}-{0:0}: blk_queue_enter+0x50f/0x640 block/blk-core.c:328 blk_mq_alloc_request+0x59b/0x950 block/blk-mq.c:651 scsi_alloc_request drivers/scsi/scsi_lib.c:1222 [inline] scsi_execute_cmd+0x1eb/0xf40 drivers/scsi/scsi_lib.c:304 read_capacity_10+0x1d4/0x6d0 drivers/scsi/sd.c:2766 sd_read_capacity drivers/scsi/sd.c:2834 [inline] sd_revalidate_disk.isra.0+0x3145/0xa8d0 drivers/scsi/sd.c:3734 sd_probe+0x904/0x1000 drivers/scsi/sd.c:4010 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #4 (&q->limits_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 queue_limits_start_update include/linux/blkdev.h:949 [inline] loop_reconfigure_limits+0x407/0x8c0 drivers/block/loop.c:998 loop_set_block_size drivers/block/loop.c:1473 [inline] lo_simple_ioctl drivers/block/loop.c:1496 [inline] lo_ioctl+0x901/0x18b0 drivers/block/loop.c:1559 blkdev_ioctl+0x276/0x6d0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&q->q_usage_counter(io)#23){++++}-{0:0}: bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1fb6/0x24c0 block/blk-mq.c:3091 __submit_bio+0x384/0x540 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e20 block/blk-core.c:868 mpage_bio_submit_read fs/mpage.c:75 [inline] mpage_readahead+0x41d/0x590 fs/mpage.c:377 read_pages+0x1a8/0xdc0 mm/readahead.c:160 page_cache_ra_unbounded+0x3dc/0x750 mm/readahead.c:295 do_page_cache_ra mm/readahead.c:325 [inline] force_page_cache_ra+0x24b/0x340 mm/readahead.c:354 page_cache_sync_ra+0x110/0x9c0 mm/readahead.c:567 page_cache_sync_readahead include/linux/pagemap.h:1397 [inline] filemap_get_pages+0xd7b/0x1be0 mm/filemap.c:2546 filemap_read+0x3ca/0xd70 mm/filemap.c:2646 blkdev_read_iter+0x187/0x480 block/fops.c:770 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x87f/0xbe0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (mapping.invalidate_lock#2){.+.+}-{4:4}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:873 [inline] filemap_fault+0x2e0/0x2820 mm/filemap.c:3332 __do_fault+0x10a/0x490 mm/memory.c:4907 do_read_fault mm/memory.c:5322 [inline] do_fault mm/memory.c:5456 [inline] do_pte_missing+0xec2/0x3e70 mm/memory.c:3979 handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112 faultin_page mm/gup.c:1187 [inline] __get_user_pages+0x8d9/0x3b50 mm/gup.c:1485 __get_user_pages_locked mm/gup.c:1751 [inline] get_user_pages_unlocked+0x1c2/0x780 mm/gup.c:2728 hva_to_pfn_slow virt/kvm/kvm_main.c:2820 [inline] hva_to_pfn+0x8be/0xc20 virt/kvm/kvm_main.c:2916 kvm_follow_pfn virt/kvm/kvm_main.c:2963 [inline] kvm_follow_pfn+0x29f/0x3f0 virt/kvm/kvm_main.c:2947 __kvm_faultin_pfn+0x11c/0x1a0 virt/kvm/kvm_main.c:2984 __kvm_mmu_faultin_pfn arch/x86/kvm/mmu/mmu.c:4354 [inline] kvm_mmu_faultin_pfn+0x469/0x1f30 arch/x86/kvm/mmu/mmu.c:4474 kvm_tdp_mmu_page_fault arch/x86/kvm/mmu/mmu.c:4642 [inline] kvm_tdp_page_fault+0x182/0x3d0 arch/x86/kvm/mmu/mmu.c:4678 kvm_mmu_do_page_fault+0x58d/0x690 arch/x86/kvm/mmu/mmu_internal.h:325 kvm_mmu_page_fault+0x20f/0x1bb0 arch/x86/kvm/mmu/mmu.c:6090 handle_ept_violation+0x25a/0x640 arch/x86/kvm/vmx/vmx.c:5832 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6620 [inline] vmx_handle_exit+0x733/0x1f70 arch/x86/kvm/vmx/vmx.c:6637 vcpu_enter_guest arch/x86/kvm/x86.c:11081 [inline] vcpu_run+0x3047/0x4f50 arch/x86/kvm/x86.c:11242 kvm_arch_vcpu_ioctl_run+0x44a/0x1740 arch/x86/kvm/x86.c:11560 kvm_vcpu_ioctl+0x6ce/0x1520 virt/kvm/kvm_main.c:4340 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:6751 [inline] __might_fault+0x11b/0x190 mm/memory.c:6744 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x29/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] __blk_trace_setup+0xa8/0x180 kernel/trace/blktrace.c:626 blk_trace_ioctl+0x163/0x290 kernel/trace/blktrace.c:740 blkdev_ioctl+0x109/0x6d0 block/ioctl.c:682 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&q->debugfs_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 blk_mq_init_sched+0x42b/0x640 block/blk-mq-sched.c:473 elevator_init_mq+0x2cd/0x420 block/elevator.c:610 add_disk_fwnode+0x113/0x1300 block/genhd.c:413 sd_probe+0xa86/0x1000 drivers/scsi/sd.c:4024 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: &q->debugfs_mutex --> &q->limits_lock --> &q->q_usage_counter(queue)#55 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(queue)#55); lock(&q->limits_lock); lock(&q->q_usage_counter(queue)#55); lock(&q->debugfs_mutex); *** DEADLOCK *** 4 locks held by kworker/u8:2/35: #0: ffff88801beee948 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90000ab7d80 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888079a50378 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff888079a50378 (&dev->mutex){....}-{4:4}, at: __device_attach_async_helper+0x84/0x290 drivers/base/dd.c:973 #3: ffff8880291958e8 (&q->q_usage_counter(queue)#55){++++}-{0:0}, at: add_disk_fwnode+0x113/0x1300 block/genhd.c:413 stack backtrace: CPU: 1 UID: 0 PID: 35 Comm: kworker/u8:2 Not tainted 6.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: async async_run_entry_fn Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 blk_mq_init_sched+0x42b/0x640 block/blk-mq-sched.c:473 elevator_init_mq+0x2cd/0x420 block/elevator.c:610 add_disk_fwnode+0x113/0x1300 block/genhd.c:413 sd_probe+0xa86/0x1000 drivers/scsi/sd.c:4024 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9c/0x530 kernel/async.c:129 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 sd 1:0:0:1: [sdc] Attached SCSI removable disk