================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/9961 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888144bf62a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888144bf62a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x75/0x480 fs/io_uring.c:7361 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_sqe_files_register fs/io_uring.c:7496 [inline] __io_uring_register fs/io_uring.c:9665 [inline] __do_sys_io_uring_register+0x338f/0x4080 fs/io_uring.c:9755 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 18864 hardirqs last enabled at (18864): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 hardirqs last disabled at (18863): [] sysvec_apic_timer_interrupt+0xc/0x100 arch/x86/kernel/apic/apic.c:1096 softirqs last enabled at (17152): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (17269): [] asm_call_irq_on_stack+0xf/0x20 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&file_data->lock); lock(&file_data->lock); *** DEADLOCK *** 7 locks held by syz-executor.1/9961: #0: ffffffff8b3fa410 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:479 [inline] #0: ffffffff8b3fa410 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm+0x108/0x1380 kernel/fork.c:1361 #1: ffff88802f95c858 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #1: ffff88802f95c858 (&mm->mmap_lock#2){++++}-{3:3}, at: dup_mmap kernel/fork.c:480 [inline] #1: ffff88802f95c858 (&mm->mmap_lock#2){++++}-{3:3}, at: dup_mm+0x12e/0x1380 kernel/fork.c:1361 #2: ffff8880241ec158 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:78 [inline] #2: ffff8880241ec158 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:489 [inline] #2: ffff8880241ec158 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm+0x18a/0x1380 kernel/fork.c:1361 #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:941 [inline] #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1058 [inline] #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1095 [inline] #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1119 [inline] #3: ffff88801841b2b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_page_range+0xc3e/0x3fa0 mm/memory.c:1192 #4: ffff8880143081f8 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:948 [inline] #4: ffff8880143081f8 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1058 [inline] #4: ffff8880143081f8 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1095 [inline] #4: ffff8880143081f8 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1119 [inline] #4: ffff8880143081f8 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_page_range+0xd14/0x3fa0 mm/memory.c:1192 #5: ffffffff8b339f40 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline] #5: ffffffff8b339f40 (rcu_callback){....}-{0:0}, at: rcu_core+0x582/0xf00 kernel/rcu/tree.c:2723 #6: ffffffff8b33a060 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x250 net/netfilter/xt_cgroup.c:62 stack backtrace: CPU: 0 PID: 9961 Comm: syz-executor.1 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_usage_bug kernel/locking/lockdep.c:3740 [inline] valid_state kernel/locking/lockdep.c:3751 [inline] mark_lock_irq kernel/locking/lockdep.c:3954 [inline] mark_lock.cold+0x31/0x73 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4306 [inline] __lock_acquire+0x11a5/0x5500 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_file_data_ref_zero+0x75/0x480 fs/io_uring.c:7361 percpu_ref_put_many.constprop.0+0x217/0x250 include/linux/percpu-refcount.h:322 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 8b 48 89 54 24 08 48 89 34 24 e8 12 4f 60 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 <65> 8b 05 00 53 91 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc90016a07808 EFLAGS: 00000202 RAX: ffffea00016fc8c8 RBX: 800000005bf23007 RCX: ffffffff81a3e772 RDX: ffff888021595040 RSI: ffff888021595040 RDI: 0000000000000007 RBP: 0000000000000028 R08: 0000000000000000 R09: ffff88801841b2a3 R10: 0000000000000020 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffea00016fc8c0 R15: 0000000000000000 copy_present_pte mm/memory.c:864 [inline] copy_pte_range mm/memory.c:978 [inline] copy_pmd_range mm/memory.c:1058 [inline] copy_pud_range mm/memory.c:1095 [inline] copy_p4d_range mm/memory.c:1119 [inline] copy_page_range+0xe3a/0x3fa0 mm/memory.c:1192 dup_mmap kernel/fork.c:594 [inline] dup_mm+0x9ed/0x1380 kernel/fork.c:1361 copy_mm kernel/fork.c:1417 [inline] copy_process+0x2a3e/0x6fc0 kernel/fork.c:2099 kernel_clone+0xe7/0xab0 kernel/fork.c:2464 __do_sys_clone+0xc8/0x110 kernel/fork.c:2581 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5fa8221c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e159 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00000000016afb7f R14: 00007f5fa82229c0 R15: 000000000119bf8c