================================ WARNING: inconsistent lock state 4.17.0-rc2+ #22 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-fuzzer/4495 [HC1[1]:SC0[0]:HE0:SE1] takes: (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30 mm/page_alloc.c:463 {HARDIRQ-ON-W} state was registered at: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740 slab_pre_alloc_hook mm/slab.h:418 [inline] slab_alloc_node mm/slab.c:3299 [inline] kmem_cache_alloc_node_trace+0x39/0x770 mm/slab.c:3661 kmalloc_node include/linux/slab.h:550 [inline] kzalloc_node include/linux/slab.h:712 [inline] alloc_worker+0xbd/0x2e0 kernel/workqueue.c:1704 init_rescuer.part.25+0x1f/0x190 kernel/workqueue.c:4000 init_rescuer kernel/workqueue.c:3997 [inline] workqueue_init+0x51f/0x7d0 kernel/workqueue.c:5732 kernel_init_freeable+0x2ad/0x58e init/main.c:1115 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 irq event stamp: 111986 hardirqs last enabled at (111985): [] do_syscall_64+0x92/0x800 arch/x86/entry/common.c:274 hardirqs last disabled at (111986): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (111922): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (111889): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (111889): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(fs_reclaim); lock(fs_reclaim); *** DEADLOCK *** 1 lock held by syz-fuzzer/4495: #0: (ptrval) (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline] #0: (ptrval) (&pipe->mutex/1){+.+.}, at: pipe_write+0xc0/0xeb0 fs/pipe.c:366 stack backtrace: CPU: 1 PID: 4495 Comm: syz-fuzzer Not tainted 4.17.0-rc2+ #22 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+0x1b9/0x294 lib/dump_stack.c:113 print_usage_bug.cold.59+0x320/0x41a kernel/locking/lockdep.c:2542 valid_state kernel/locking/lockdep.c:2555 [inline] mark_lock_irq kernel/locking/lockdep.c:2749 [inline] mark_lock+0x1034/0x19e0 kernel/locking/lockdep.c:3147 mark_irqflags kernel/locking/lockdep.c:3022 [inline] __lock_acquire+0x1595/0x5140 kernel/locking/lockdep.c:3388 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740 slab_pre_alloc_hook mm/slab.h:418 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3716 [inline] __kmalloc+0x45/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:642 [inline] numa_crng_init drivers/char/random.c:798 [inline] crng_reseed+0x427/0x920 drivers/char/random.c:923 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 RIP: 0010:is_idle_task include/linux/sched.h:1481 [inline] RIP: 0010:___might_sleep+0x20e/0x320 kernel/sched/core.c:6156 RSP: 0018:ffff8801ad3c7938 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffffd9 RAX: dffffc0000000000 RBX: 1ffff10035a78f27 RCX: 1ffff10038cad54d RDX: 0000000000000000 RSI: ffffffff88d8e5e0 RDI: ffff8801c656a264 RBP: ffff8801ad3c79b8 R08: 1ffff10035a78f1d R09: 0000000000000001 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8801c656a240 R13: ffffffff87fa0220 R14: 000000000000003b R15: 0000000000000000 __might_sleep+0x95/0x190 kernel/sched/core.c:6141 kmap include/linux/highmem.h:59 [inline] copy_page_from_iter_iovec lib/iov_iter.c:288 [inline] copy_page_from_iter+0x383/0x880 lib/iov_iter.c:731 pipe_write+0x235/0xeb0 fs/pipe.c:429 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x47fc44 RSP: 002b:000000c424e89658 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fc44 RDX: 00000000000000a9 RSI: 000000c4249df500 RDI: 0000000000000002 RBP: 000000c424e896a8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000c42218e000 R13: 00000000008a9e00 R14: 0000000000000011 R15: 0000000000000000 BUG: sleeping function called from invalid context at mm/slab.h:421 in_atomic(): 1, irqs_disabled(): 1, pid: 4495, name: syz-fuzzer INFO: lockdep is turned off. irq event stamp: 111986 hardirqs last enabled at (111985): [] do_syscall_64+0x92/0x800 arch/x86/entry/common.c:274 hardirqs last disabled at (111986): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (111922): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (111889): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (111889): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 1 PID: 4495 Comm: syz-fuzzer Not tainted 4.17.0-rc2+ #22 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+0x1b9/0x294 lib/dump_stack.c:113 ___might_sleep.cold.87+0x11f/0x13a kernel/sched/core.c:6188 __might_sleep+0x95/0x190 kernel/sched/core.c:6141 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3716 [inline] __kmalloc+0x2b9/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:642 [inline] numa_crng_init drivers/char/random.c:798 [inline] crng_reseed+0x427/0x920 drivers/char/random.c:923 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 RIP: 0010:is_idle_task include/linux/sched.h:1481 [inline] RIP: 0010:___might_sleep+0x20e/0x320 kernel/sched/core.c:6156 RSP: 0018:ffff8801ad3c7938 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffffd9 RAX: dffffc0000000000 RBX: 1ffff10035a78f27 RCX: 1ffff10038cad54d RDX: 0000000000000000 RSI: ffffffff88d8e5e0 RDI: ffff8801c656a264 RBP: ffff8801ad3c79b8 R08: 1ffff10035a78f1d R09: 0000000000000001 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8801c656a240 R13: ffffffff87fa0220 R14: 000000000000003b R15: 0000000000000000 __might_sleep+0x95/0x190 kernel/sched/core.c:6141 kmap include/linux/highmem.h:59 [inline] copy_page_from_iter_iovec lib/iov_iter.c:288 [inline] copy_page_from_iter+0x383/0x880 lib/iov_iter.c:731 pipe_write+0x235/0xeb0 fs/pipe.c:429 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x47fc44 RSP: 002b:000000c424e89658 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fc44 RDX: 00000000000000a9 RSI: 000000c4249df500 RDI: 0000000000000002 RBP: 000000c424e896a8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000c42218e000 R13: 00000000008a9e00 R14: 0000000000000011 R15: 0000000000000000 random: crng init done