======================================================== WARNING: possible irq lock inversion dependency detected 5.3.0+ #0 Not tainted -------------------------------------------------------- syz-executor.0/11406 just changed the state of lock: ffff88806250bb58 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:363 [inline] ffff88806250bb58 (&(&ctx->ctx_lock)->rlock){..-.}, at: free_ioctx_users+0x2d/0x490 fs/aio.c:618 but this lock took another, SOFTIRQ-unsafe lock in the past: (&fiq->waitq){+.+.} and interrupts could create inverse lock ordering between them. 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 *** 4 locks held by syz-executor.0/11406: #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pte_range mm/memory.c:1020 [inline] #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pmd_range mm/memory.c:1161 [inline] #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pud_range mm/memory.c:1190 [inline] #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_p4d_range mm/memory.c:1211 [inline] #0: ffff8880a9713b18 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: unmap_page_range+0x818/0x2580 mm/memory.c:1232 #1: ffffffff88fab300 (rcu_read_lock){....}, at: lock_page_memcg+0x0/0x240 include/linux/cgroup.h:487 #2: ffffffff88fab240 (rcu_callback){....}, at: __rcu_reclaim kernel/rcu/rcu.h:210 [inline] #2: ffffffff88fab240 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2157 [inline] #2: ffffffff88fab240 (rcu_callback){....}, at: rcu_core+0x60e/0x1560 kernel/rcu/tree.c:2377 #3: ffffffff88fab280 (rcu_read_lock_sched){....}, at: percpu_ref_call_confirm_rcu lib/percpu-refcount.c:126 [inline] #3: ffffffff88fab280 (rcu_read_lock_sched){....}, at: percpu_ref_switch_to_atomic_rcu+0x20e/0x570 lib/percpu-refcount.c:165 the shortest dependencies between 2nd lock and 1st lock: -> (&fiq->waitq){+.+.} { HARDIRQ-ON-W at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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 fuse_send_init fs/fuse/inode.c:986 [inline] fuse_fill_super+0x13cd/0x1730 fs/fuse/inode.c:1211 mount_nodev+0x66/0x110 fs/super.c:1458 fuse_mount+0x2d/0x40 fs/fuse/inode.c:1236 legacy_get_tree+0x108/0x220 fs/fs_context.c:659 vfs_get_tree+0x8e/0x390 fs/super.c:1542 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x1453/0x1d80 fs/namespace.c:3145 ksys_mount+0xdb/0x150 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3365 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe SOFTIRQ-ON-W at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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 fuse_send_init fs/fuse/inode.c:986 [inline] fuse_fill_super+0x13cd/0x1730 fs/fuse/inode.c:1211 mount_nodev+0x66/0x110 fs/super.c:1458 fuse_mount+0x2d/0x40 fs/fuse/inode.c:1236 legacy_get_tree+0x108/0x220 fs/fs_context.c:659 vfs_get_tree+0x8e/0x390 fs/super.c:1542 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x1453/0x1d80 fs/namespace.c:3145 ksys_mount+0xdb/0x150 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3365 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe INITIAL USE at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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 fuse_send_init fs/fuse/inode.c:986 [inline] fuse_fill_super+0x13cd/0x1730 fs/fuse/inode.c:1211 mount_nodev+0x66/0x110 fs/super.c:1458 fuse_mount+0x2d/0x40 fs/fuse/inode.c:1236 legacy_get_tree+0x108/0x220 fs/fs_context.c:659 vfs_get_tree+0x8e/0x390 fs/super.c:1542 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x1453/0x1d80 fs/namespace.c:3145 ksys_mount+0xdb/0x150 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3365 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe } ... key at: [] __key.44672+0x0/0x40 ... acquired at: __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_sys_io_submit fs/aio.c:1921 [inline] __se_sys_io_submit fs/aio.c:1891 [inline] __x64_sys_io_submit+0x1bd/0x570 fs/aio.c:1891 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> (&(&ctx->ctx_lock)->rlock){..-.} { IN-SOFTIRQ-W at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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:2157 [inline] rcu_core+0x581/0x1560 kernel/rcu/tree.c:2377 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2386 __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:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 debug_smp_processor_id+0x8/0x214 lib/smp_processor_id.c:56 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:299 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:901 rcu_read_unlock include/linux/rcupdate.h:649 [inline] __unlock_page_memcg+0x78/0x100 mm/memcontrol.c:2137 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:2146 page_remove_file_rmap mm/rmap.c:1252 [inline] page_remove_rmap+0x614/0x1190 mm/rmap.c:1303 zap_pte_range mm/memory.c:1059 [inline] zap_pmd_range mm/memory.c:1161 [inline] zap_pud_range mm/memory.c:1190 [inline] zap_p4d_range mm/memory.c:1211 [inline] unmap_page_range+0xd43/0x2580 mm/memory.c:1232 unmap_single_vma+0x19d/0x300 mm/memory.c:1277 unmap_vmas+0x189/0x300 mm/memory.c:1309 exit_mmap+0x2ba/0x530 mm/mmap.c:3149 __mmput kernel/fork.c:1065 [inline] mmput+0x179/0x4d0 kernel/fork.c:1086 exit_mm kernel/exit.c:547 [inline] do_exit+0x84e/0x2e50 kernel/exit.c:866 do_group_exit+0x135/0x360 kernel/exit.c:983 get_signal+0x47c/0x2500 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe INITIAL USE at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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] aio_poll fs/aio.c:1749 [inline] __io_submit_one fs/aio.c:1825 [inline] io_submit_one+0xeb5/0x2ef0 fs/aio.c:1862 __do_sys_io_submit fs/aio.c:1921 [inline] __se_sys_io_submit fs/aio.c:1891 [inline] __x64_sys_io_submit+0x1bd/0x570 fs/aio.c:1891 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe } ... key at: [] __key.54289+0x0/0x40 ... acquired at: mark_lock_irq kernel/locking/lockdep.c:3317 [inline] mark_lock+0x517/0x1220 kernel/locking/lockdep.c:3666 mark_usage kernel/locking/lockdep.c:3566 [inline] __lock_acquire+0x1eaf/0x4e70 kernel/locking/lockdep.c:3909 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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:2157 [inline] rcu_core+0x581/0x1560 kernel/rcu/tree.c:2377 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2386 __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:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 debug_smp_processor_id+0x8/0x214 lib/smp_processor_id.c:56 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:299 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:901 rcu_read_unlock include/linux/rcupdate.h:649 [inline] __unlock_page_memcg+0x78/0x100 mm/memcontrol.c:2137 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:2146 page_remove_file_rmap mm/rmap.c:1252 [inline] page_remove_rmap+0x614/0x1190 mm/rmap.c:1303 zap_pte_range mm/memory.c:1059 [inline] zap_pmd_range mm/memory.c:1161 [inline] zap_pud_range mm/memory.c:1190 [inline] zap_p4d_range mm/memory.c:1211 [inline] unmap_page_range+0xd43/0x2580 mm/memory.c:1232 unmap_single_vma+0x19d/0x300 mm/memory.c:1277 unmap_vmas+0x189/0x300 mm/memory.c:1309 exit_mmap+0x2ba/0x530 mm/mmap.c:3149 __mmput kernel/fork.c:1065 [inline] mmput+0x179/0x4d0 kernel/fork.c:1086 exit_mm kernel/exit.c:547 [inline] do_exit+0x84e/0x2e50 kernel/exit.c:866 do_group_exit+0x135/0x360 kernel/exit.c:983 get_signal+0x47c/0x2500 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe stack backtrace: CPU: 1 PID: 11406 Comm: syz-executor.0 Not tainted 5.3.0+ #0 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_irq_inversion_bug.part.0+0x2e4/0x2f1 kernel/locking/lockdep.c:3179 print_irq_inversion_bug kernel/locking/lockdep.c:3180 [inline] check_usage_forwards.cold+0x20/0x29 kernel/locking/lockdep.c:3204 mark_lock_irq kernel/locking/lockdep.c:3317 [inline] mark_lock+0x517/0x1220 kernel/locking/lockdep.c:3666 mark_usage kernel/locking/lockdep.c:3566 [inline] __lock_acquire+0x1eaf/0x4e70 kernel/locking/lockdep.c:3909 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 __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:2157 [inline] rcu_core+0x581/0x1560 kernel/rcu/tree.c:2377 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2386 __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:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:debug_smp_processor_id+0x8/0x214 lib/smp_processor_id.c:56 Code: 8a 6a fe e9 77 ff ff ff 4c 89 ef e8 b2 8a 6a fe e9 00 ff ff ff e8 a8 8a 6a fe e9 d4 fe ff ff 0f 1f 00 55 48 89 e5 41 56 41 55 <41> 54 53 e8 30 c3 2f fe 65 44 8b 25 c8 4a be 7c 65 8b 1d 79 b5 be RSP: 0018:ffff88806257f648 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 00000000000355c0 RCX: 1ffffffff138dc9e RDX: 0000000000000000 RSI: ffffffff81a3227c RDI: ffff888062e72954 RBP: ffff88806257f658 R08: ffff888062e720c0 R09: fffff9400050f4bf R10: fffff9400050f4be R11: ffffea000287a5f3 R12: ffffea000287a5c0 R13: 0000000000000000 R14: ffffea000287a5c8 R15: dead000000000100 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:299 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:901 rcu_read_unlock include/linux/rcupdate.h:649 [inline] __unlock_page_memcg+0x78/0x100 mm/memcontrol.c:2137 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:2146 page_remove_file_rmap mm/rmap.c:1252 [inline] page_remove_rmap+0x614/0x1190 mm/rmap.c:1303 zap_pte_range mm/memory.c:1059 [inline] zap_pmd_range mm/memory.c:1161 [inline] zap_pud_range mm/memory.c:1190 [inline] zap_p4d_range mm/memory.c:1211 [inline] unmap_page_range+0xd43/0x2580 mm/memory.c:1232 unmap_single_vma+0x19d/0x300 mm/memory.c:1277 unmap_vmas+0x189/0x300 mm/memory.c:1309 exit_mmap+0x2ba/0x530 mm/mmap.c:3149 __mmput kernel/fork.c:1065 [inline] mmput+0x179/0x4d0 kernel/fork.c:1086 exit_mm kernel/exit.c:547 [inline] do_exit+0x84e/0x2e50 kernel/exit.c:866 do_group_exit+0x135/0x360 kernel/exit.c:983 get_signal+0x47c/0x2500 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a09 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fedb2d1bcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459a09 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffc1453f16f R14: 00007fedb2d1c9c0 R15: 000000000075bf2c