===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.2.0+ #64 Not tainted ----------------------------------------------------- syz-executor.1/23502 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: 00000000007c31fe (&fiq->waitq){+.+.}, at: spin_lock /./include/linux/spinlock.h:338 [inline] 00000000007c31fe (&fiq->waitq){+.+.}, at: aio_poll /fs/aio.c:1751 [inline] 00000000007c31fe (&fiq->waitq){+.+.}, at: __io_submit_one /fs/aio.c:1825 [inline] 00000000007c31fe (&fiq->waitq){+.+.}, at: io_submit_one+0xefa/0x2ef0 /fs/aio.c:1862 and this task is already holding: 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq /./include/linux/spinlock.h:363 [inline] 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll /fs/aio.c:1749 [inline] 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: __io_submit_one /fs/aio.c:1825 [inline] 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: io_submit_one+0xeb5/0x2ef0 /fs/aio.c:1862 which would create a new lock dependency: (&(&ctx->ctx_lock)->rlock){..-.} -> (&fiq->waitq){+.+.} but this new dependency connects a SOFTIRQ-irq-safe lock: (&(&ctx->ctx_lock)->rlock){..-.} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock_irq /./include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x60/0x80 /kernel/locking/spinlock.c:167 spin_lock_irq /./include/linux/spinlock.h:363 [inline] free_ioctx_users+0x2d/0x490 /fs/aio.c:618 percpu_ref_put_many /./include/linux/percpu-refcount.h:293 [inline] percpu_ref_put /./include/linux/percpu-refcount.h:309 [inline] percpu_ref_call_confirm_rcu /lib/percpu-refcount.c:130 [inline] percpu_ref_switch_to_atomic_rcu+0x4c0/0x570 /lib/percpu-refcount.c:165 __rcu_reclaim /kernel/rcu/rcu.h:222 [inline] rcu_do_batch /kernel/rcu/tree.c:2114 [inline] rcu_core+0x67f/0x1580 /kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 /kernel/rcu/tree.c:2323 __do_softirq+0x262/0x98c /kernel/softirq.c:292 invoke_softirq /kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 /kernel/softirq.c:413 exiting_irq /./arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 /arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828 __read_once_size /./include/linux/compiler.h:194 [inline] compound_head /./include/linux/page-flags.h:172 [inline] PageSwapBacked /./include/linux/page-flags.h:336 [inline] mm_counter_file /./include/linux/mm.h:1692 [inline] mm_counter /./include/linux/mm.h:1701 [inline] copy_one_pte /mm/memory.c:774 [inline] copy_pte_range /mm/memory.c:823 [inline] copy_pmd_range /mm/memory.c:874 [inline] copy_pud_range /mm/memory.c:908 [inline] copy_p4d_range /mm/memory.c:930 [inline] copy_page_range+0x10e2/0x1ee0 /mm/memory.c:992 dup_mmap /kernel/fork.c:592 [inline] dup_mm+0xa67/0x1430 /kernel/fork.c:1346 copy_mm /kernel/fork.c:1402 [inline] copy_process+0x28b7/0x6b00 /kernel/fork.c:2017 _do_fork+0x146/0xfa0 /kernel/fork.c:2369 __do_compat_sys_x86_clone /arch/x86/ia32/sys_ia32.c:253 [inline] __se_compat_sys_x86_clone /arch/x86/ia32/sys_ia32.c:236 [inline] __ia32_compat_sys_x86_clone+0x188/0x260 /arch/x86/ia32/sys_ia32.c:236 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 to a SOFTIRQ-irq-unsafe lock: (&fiq->waitq){+.+.} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] flush_bg_queue+0x1f3/0x3c0 /fs/fuse/dev.c:415 fuse_request_queue_background+0x2f8/0x5a0 /fs/fuse/dev.c:676 fuse_request_send_background+0x58/0x110 /fs/fuse/dev.c:687 cuse_send_init /fs/fuse/cuse.c:459 [inline] cuse_channel_open+0x5ba/0x830 /fs/fuse/cuse.c:519 misc_open+0x395/0x4c0 /drivers/char/misc.c:141 chrdev_open+0x245/0x6b0 /fs/char_dev.c:414 do_dentry_open+0x4df/0x1250 /fs/open.c:778 vfs_open+0xa0/0xd0 /fs/open.c:887 do_last /fs/namei.c:3416 [inline] path_openat+0x10e9/0x4630 /fs/namei.c:3533 do_filp_open+0x1a1/0x280 /fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070 __do_compat_sys_openat /fs/open.c:1116 [inline] __se_compat_sys_openat /fs/open.c:1114 [inline] __ia32_compat_sys_openat+0x98/0xf0 /fs/open.c:1114 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fiq->waitq); local_irq_disable(); lock(&(&ctx->ctx_lock)->rlock); lock(&fiq->waitq); lock(&(&ctx->ctx_lock)->rlock); *** DEADLOCK *** 1 lock held by syz-executor.1/23502: #0: 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq /./include/linux/spinlock.h:363 [inline] #0: 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll /fs/aio.c:1749 [inline] #0: 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: __io_submit_one /fs/aio.c:1825 [inline] #0: 000000003c8c7d49 (&(&ctx->ctx_lock)->rlock){..-.}, at: io_submit_one+0xeb5/0x2ef0 /fs/aio.c:1862 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&(&ctx->ctx_lock)->rlock){..-.} { IN-SOFTIRQ-W at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock_irq /./include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x60/0x80 /kernel/locking/spinlock.c:167 spin_lock_irq /./include/linux/spinlock.h:363 [inline] free_ioctx_users+0x2d/0x490 /fs/aio.c:618 percpu_ref_put_many /./include/linux/percpu-refcount.h:293 [inline] percpu_ref_put /./include/linux/percpu-refcount.h:309 [inline] percpu_ref_call_confirm_rcu /lib/percpu-refcount.c:130 [inline] percpu_ref_switch_to_atomic_rcu+0x4c0/0x570 /lib/percpu-refcount.c:165 __rcu_reclaim /kernel/rcu/rcu.h:222 [inline] rcu_do_batch /kernel/rcu/tree.c:2114 [inline] rcu_core+0x67f/0x1580 /kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 /kernel/rcu/tree.c:2323 __do_softirq+0x262/0x98c /kernel/softirq.c:292 invoke_softirq /kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 /kernel/softirq.c:413 exiting_irq /./arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 /arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828 __read_once_size /./include/linux/compiler.h:194 [inline] compound_head /./include/linux/page-flags.h:172 [inline] PageSwapBacked /./include/linux/page-flags.h:336 [inline] mm_counter_file /./include/linux/mm.h:1692 [inline] mm_counter /./include/linux/mm.h:1701 [inline] copy_one_pte /mm/memory.c:774 [inline] copy_pte_range /mm/memory.c:823 [inline] copy_pmd_range /mm/memory.c:874 [inline] copy_pud_range /mm/memory.c:908 [inline] copy_p4d_range /mm/memory.c:930 [inline] copy_page_range+0x10e2/0x1ee0 /mm/memory.c:992 dup_mmap /kernel/fork.c:592 [inline] dup_mm+0xa67/0x1430 /kernel/fork.c:1346 copy_mm /kernel/fork.c:1402 [inline] copy_process+0x28b7/0x6b00 /kernel/fork.c:2017 _do_fork+0x146/0xfa0 /kernel/fork.c:2369 __do_compat_sys_x86_clone /arch/x86/ia32/sys_ia32.c:253 [inline] __se_compat_sys_x86_clone /arch/x86/ia32/sys_ia32.c:236 [inline] __ia32_compat_sys_x86_clone+0x188/0x260 /arch/x86/ia32/sys_ia32.c:236 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 INITIAL USE at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock_irq /./include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x60/0x80 /kernel/locking/spinlock.c:167 spin_lock_irq /./include/linux/spinlock.h:363 [inline] __do_sys_io_cancel /fs/aio.c:2003 [inline] __se_sys_io_cancel /fs/aio.c:1985 [inline] __ia32_sys_io_cancel+0xd4/0x690 /fs/aio.c:1985 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 } ... key at: [] __key.53879+0x0/0x40 ... acquired at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] aio_poll /fs/aio.c:1751 [inline] __io_submit_one /fs/aio.c:1825 [inline] io_submit_one+0xefa/0x2ef0 /fs/aio.c:1862 __do_compat_sys_io_submit /fs/aio.c:1963 [inline] __se_compat_sys_io_submit /fs/aio.c:1933 [inline] __ia32_compat_sys_io_submit+0x1bf/0x570 /fs/aio.c:1933 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (&fiq->waitq){+.+.} { HARDIRQ-ON-W at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] flush_bg_queue+0x1f3/0x3c0 /fs/fuse/dev.c:415 fuse_request_queue_background+0x2f8/0x5a0 /fs/fuse/dev.c:676 fuse_request_send_background+0x58/0x110 /fs/fuse/dev.c:687 cuse_send_init /fs/fuse/cuse.c:459 [inline] cuse_channel_open+0x5ba/0x830 /fs/fuse/cuse.c:519 misc_open+0x395/0x4c0 /drivers/char/misc.c:141 chrdev_open+0x245/0x6b0 /fs/char_dev.c:414 do_dentry_open+0x4df/0x1250 /fs/open.c:778 vfs_open+0xa0/0xd0 /fs/open.c:887 do_last /fs/namei.c:3416 [inline] path_openat+0x10e9/0x4630 /fs/namei.c:3533 do_filp_open+0x1a1/0x280 /fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070 __do_compat_sys_openat /fs/open.c:1116 [inline] __se_compat_sys_openat /fs/open.c:1114 [inline] __ia32_compat_sys_openat+0x98/0xf0 /fs/open.c:1114 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 SOFTIRQ-ON-W at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] flush_bg_queue+0x1f3/0x3c0 /fs/fuse/dev.c:415 fuse_request_queue_background+0x2f8/0x5a0 /fs/fuse/dev.c:676 fuse_request_send_background+0x58/0x110 /fs/fuse/dev.c:687 cuse_send_init /fs/fuse/cuse.c:459 [inline] cuse_channel_open+0x5ba/0x830 /fs/fuse/cuse.c:519 misc_open+0x395/0x4c0 /drivers/char/misc.c:141 chrdev_open+0x245/0x6b0 /fs/char_dev.c:414 do_dentry_open+0x4df/0x1250 /fs/open.c:778 vfs_open+0xa0/0xd0 /fs/open.c:887 do_last /fs/namei.c:3416 [inline] path_openat+0x10e9/0x4630 /fs/namei.c:3533 do_filp_open+0x1a1/0x280 /fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070 __do_compat_sys_openat /fs/open.c:1116 [inline] __se_compat_sys_openat /fs/open.c:1114 [inline] __ia32_compat_sys_openat+0x98/0xf0 /fs/open.c:1114 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 INITIAL USE at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] flush_bg_queue+0x1f3/0x3c0 /fs/fuse/dev.c:415 fuse_request_queue_background+0x2f8/0x5a0 /fs/fuse/dev.c:676 fuse_request_send_background+0x58/0x110 /fs/fuse/dev.c:687 cuse_send_init /fs/fuse/cuse.c:459 [inline] cuse_channel_open+0x5ba/0x830 /fs/fuse/cuse.c:519 misc_open+0x395/0x4c0 /drivers/char/misc.c:141 chrdev_open+0x245/0x6b0 /fs/char_dev.c:414 do_dentry_open+0x4df/0x1250 /fs/open.c:778 vfs_open+0xa0/0xd0 /fs/open.c:887 do_last /fs/namei.c:3416 [inline] path_openat+0x10e9/0x4630 /fs/namei.c:3533 do_filp_open+0x1a1/0x280 /fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070 __do_compat_sys_openat /fs/open.c:1116 [inline] __se_compat_sys_openat /fs/open.c:1114 [inline] __ia32_compat_sys_openat+0x98/0xf0 /fs/open.c:1114 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 } ... key at: [] __key.44338+0x0/0x40 ... acquired at: lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] aio_poll /fs/aio.c:1751 [inline] __io_submit_one /fs/aio.c:1825 [inline] io_submit_one+0xefa/0x2ef0 /fs/aio.c:1862 __do_compat_sys_io_submit /fs/aio.c:1963 [inline] __se_compat_sys_io_submit /fs/aio.c:1933 [inline] __ia32_compat_sys_io_submit+0x1bf/0x570 /fs/aio.c:1933 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 stack backtrace: CPU: 1 PID: 23502 Comm: syz-executor.1 Not tainted 5.2.0+ #64 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 /lib/dump_stack.c:113 print_bad_irq_dependency /kernel/locking/lockdep.c:2025 [inline] check_irq_usage.cold+0x5b4/0x72e /kernel/locking/lockdep.c:2223 check_prev_add /kernel/locking/lockdep.c:2409 [inline] check_prevs_add /kernel/locking/lockdep.c:2507 [inline] validate_chain /kernel/locking/lockdep.c:2897 [inline] __lock_acquire+0x25c3/0x4c30 /kernel/locking/lockdep.c:3880 lock_acquire+0x190/0x410 /kernel/locking/lockdep.c:4413 __raw_spin_lock /./include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 /kernel/locking/spinlock.c:151 spin_lock /./include/linux/spinlock.h:338 [inline] aio_poll /fs/aio.c:1751 [inline] __io_submit_one /fs/aio.c:1825 [inline] io_submit_one+0xefa/0x2ef0 /fs/aio.c:1862 __do_compat_sys_io_submit /fs/aio.c:1963 [inline] __se_compat_sys_io_submit /fs/aio.c:1933 [inline] __ia32_compat_sys_io_submit+0x1bf/0x570 /fs/aio.c:1933 do_syscall_32_irqs_on /arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 /arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f /arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fd29c9 Code: d3 83 c4 10 5b 5e 5d c3 ba 80 96 98 00 eb a9 8b 04 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5dce0cc EFLAGS: 00000296 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00000000f5dad000 RCX: 0000000000000001 RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000