================================ WARNING: inconsistent lock state syzkaller #0 Tainted: G L -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. rm/16954 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888031323068 (&dev->spinlock){?...}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] ffff888031323068 (&dev->spinlock){?...}-{3:3}, at: das16m1_interrupt+0x5e/0x180 drivers/comedi/drivers/das16m1.c:460 {HARDIRQ-ON-W} state was registered at: lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:182 spin_lock_bh include/linux/spinlock.h:348 [inline] waveform_ao_cancel+0x8d/0x120 drivers/comedi/drivers/comedi_test.c:628 do_cancel drivers/comedi/comedi_fops.c:818 [inline] comedi_close+0x27e/0x5e0 drivers/comedi/comedi_fops.c:3036 __fput+0x44f/0xa60 fs/file_table.c:473 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 2932 hardirqs last enabled at (2931): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1643 [inline] hardirqs last enabled at (2931): [] finish_lock_switch kernel/sched/core.c:5091 [inline] hardirqs last enabled at (2931): [] finish_task_switch+0x41f/0xbe0 kernel/sched/core.c:5209 hardirqs last disabled at (2932): [] common_interrupt+0x13/0xe0 arch/x86/kernel/irq.c:326 softirqs last enabled at (2928): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (2928): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (2928): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 softirqs last disabled at (2749): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2749): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2749): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->spinlock); lock(&dev->spinlock); *** DEADLOCK *** 2 locks held by rm/16954: #0: ffff88807d30a7f8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline] #0: ffff88807d30a7f8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x234/0x4f0 mm/util.c:579 #1: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #1: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #1: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline] #1: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495 stack backtrace: CPU: 0 UID: 0 PID: 16954 Comm: rm Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042 valid_state kernel/locking/lockdep.c:4056 [inline] mark_lock_irq+0x410/0x420 kernel/locking/lockdep.c:-1 mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 mark_usage kernel/locking/lockdep.c:4639 [inline] __lock_acquire+0x661/0x2cf0 kernel/locking/lockdep.c:5191 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 spin_lock include/linux/spinlock.h:342 [inline] das16m1_interrupt+0x5e/0x180 drivers/comedi/drivers/das16m1.c:460 __handle_irq_event_percpu+0x216/0x9a0 kernel/irq/handle.c:209 handle_irq_event_percpu kernel/irq/handle.c:246 [inline] handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:263 handle_edge_irq+0x23b/0x9f0 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:186 [inline] handle_irq arch/x86/kernel/irq.c:262 [inline] call_irq_handler arch/x86/kernel/irq.c:-1 [inline] __common_interrupt+0x141/0x1f0 arch/x86/kernel/irq.c:333 common_interrupt+0xb6/0xe0 arch/x86/kernel/irq.c:326 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 RIP: 0010:finish_task_switch+0x427/0xbe0 kernel/sched/core.c:5211 Code: 41 c7 84 24 e0 0d 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 76 6b 1c 0a e8 61 b5 38 00 fb 49 8d bd 68 16 00 00 <48> 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 7b 03 00 00 41 80 RSP: 0018:ffffc90003cae930 EFLAGS: 00000202 RAX: 0000000000000b73 RBX: 1ffff110170c777c RCX: 0000000080000001 RDX: 0000000000000006 RSI: ffffffff8dfc0ce0 RDI: ffff88803068d368 RBP: ffffc90003cae990 R08: ffffffff9031b4f7 R09: 1ffffffff206369e R10: dffffc0000000000 R11: fffffbfff206369f R12: ffff8880b863ae48 R13: ffff88803068bd00 R14: ffff8880790f5b80 R15: dffffc0000000000 context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1664/0x5520 kernel/sched/core.c:6966 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7294 irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x7f/0x3c0 kernel/locking/lockdep.c:5881 Code: 96 96 8f 0e 00 0f 84 1c 02 00 00 65 8b 05 79 34 9a 11 85 c0 0f 85 0d 02 00 00 65 4c 8b 3d c1 ee 99 11 41 83 bf 4c 0b 00 00 00 <0f> 85 f7 01 00 00 49 81 3e 80 13 00 94 0f 84 ea 01 00 00 9c 5b fa RSP: 0018:ffffc90003caecf0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff90d44101 RCX: 0000000080000001 RDX: ffffc90003caee01 RSI: ffffffff8c287dc0 RDI: ffffffff8c287d80 RBP: dffffc0000000000 R08: ffffc90003caf190 R09: 0000000000000000 R10: ffffc90003caee78 R11: fffff52000795dd1 R12: ffffc90003caf1a0 R13: ffffffff81771256 R14: ffffffff8e95d260 R15: ffff88803068bd00 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1bba/0x2550 arch/x86/kernel/unwind_orc.c:709 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4905 vm_area_dup+0x2b/0x680 mm/vma_init.c:123 __split_vma+0x1dc/0xa40 mm/vma.c:516 vms_gather_munmap_vmas+0x4fa/0x1380 mm/vma.c:1448 __mmap_setup mm/vma.c:2439 [inline] __mmap_region mm/vma.c:2753 [inline] mmap_region+0x856/0x2280 mm/vma.c:2856 do_mmap+0xc39/0x10c0 mm/mmap.c:560 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:606 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f07ffd50242 Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00 RSP: 002b:00007fff213685e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f07ffc72000 RCX: 00007f07ffd50242 RDX: 0000000000000005 RSI: 0000000000086000 RDI: 00007f07ffc72000 RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000010000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007fff21368638 R13: 00007f07ffd240c0 R14: 00007fff213689f0 R15: 00000fffe426d0c0 comedi comedi3: fifo overflow ---------------- Code disassembly (best guess): 0: 41 c7 84 24 e0 0d 00 movl $0x0,0xde0(%r12) 7: 00 00 00 00 00 c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 11: 49 83 c4 48 add $0x48,%r12 15: 4c 89 e7 mov %r12,%rdi 18: e8 76 6b 1c 0a call 0xa1c6b93 1d: e8 61 b5 38 00 call 0x38b583 22: fb sti 23: 49 8d bd 68 16 00 00 lea 0x1668(%r13),%rdi * 2a: 48 89 f8 mov %rdi,%rax <-- trapping instruction 2d: 48 c1 e8 03 shr $0x3,%rax 31: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax 36: 84 c0 test %al,%al 38: 0f 85 7b 03 00 00 jne 0x3b9 3e: 41 rex.B 3f: 80 .byte 0x80