BUG: sleeping function called from invalid context at mm/slab.h:421 in_atomic(): 1, irqs_disabled(): 1, pid: 4442, name: syz-fuzzer 4 locks held by syz-fuzzer/4442: #0: (ptrval) (&mm->mmap_sem){++++}, at: __do_page_fault+0x381/0xe40 arch/x86/mm/fault.c:1328 #1: (ptrval) (sb_pagefaults){.+.+}, at: sb_start_pagefault include/linux/fs.h:1579 [inline] #1: (ptrval) (sb_pagefaults){.+.+}, at: ext4_page_mkwrite+0x1c8/0x1420 fs/ext4/inode.c:6094 #2: (ptrval) (jbd2_handle){++++}, at: start_this_handle+0x581/0x1250 fs/jbd2/transaction.c:385 #3: (ptrval) (&(&ei->i_raw_lock)->rlock){+.+.}, at: spin_lock include/linux/spinlock.h:310 [inline] #3: (ptrval) (&(&ei->i_raw_lock)->rlock){+.+.}, at: ext4_do_update_inode fs/ext4/inode.c:5120 [inline] #3: (ptrval) (&(&ei->i_raw_lock)->rlock){+.+.}, at: ext4_mark_iloc_dirty+0x295/0x2e90 fs/ext4/inode.c:5741 irq event stamp: 138310 hardirqs last enabled at (138309): [] lookup_bh_lru fs/buffer.c:1271 [inline] hardirqs last enabled at (138309): [] __find_get_block+0x2b8/0xe50 fs/buffer.c:1283 hardirqs last disabled at (138310): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (138232): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (138217): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (138217): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 1 PID: 4442 Comm: syz-fuzzer Not tainted 4.17.0-rc2+ #24 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:ext4_do_update_inode fs/ext4/inode.c:5176 [inline] RIP: 0010:ext4_mark_iloc_dirty+0x251b/0x2e90 fs/ext4/inode.c:5741 RSP: 0000:ffff8801bfb4edd8 EFLAGS: 00000212 ORIG_RAX: ffffffffffffffd9 RAX: 0000000000000000 RBX: ffff8801aee4e2f0 RCX: ffffffff8206ede0 RDX: 00000000000000a0 RSI: 000000000000009f RDI: 0000000000000005 RBP: ffff8801bfb4efa0 R08: ffff8801b6efa180 R09: ffffed0035dc9c9a R10: ffffed0035dc9c9a R11: ffff8801aee4e4d7 R12: ffff8801bfd1a600 R13: 00000000000000a0 R14: 0000000000000000 R15: 0000000000000000 ext4_mark_inode_dirty+0x23b/0xb20 fs/ext4/inode.c:5920 ext4_dirty_inode+0x97/0xc0 fs/ext4/inode.c:5951 __mark_inode_dirty+0x811/0x1530 fs/fs-writeback.c:2129 generic_update_time+0x255/0x420 fs/inode.c:1656 update_time fs/inode.c:1672 [inline] file_update_time+0x384/0x640 fs/inode.c:1883 ext4_page_mkwrite+0x1f6/0x1420 fs/ext4/inode.c:6095 do_page_mkwrite+0x146/0x500 mm/memory.c:2371 wp_page_shared mm/memory.c:2667 [inline] do_wp_page+0xf5d/0x1990 mm/memory.c:2767 handle_pte_fault mm/memory.c:3979 [inline] __handle_mm_fault+0x2996/0x4310 mm/memory.c:4087 handle_mm_fault+0x53a/0xc70 mm/memory.c:4124 __do_page_fault+0x60b/0xe40 arch/x86/mm/fault.c:1399 do_page_fault+0xee/0x8a7 arch/x86/mm/fault.c:1474 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0033:0x708ba1 RSP: 002b:000000c42099b1c0 EFLAGS: 00010212 RAX: 000000c42099b908 RBX: 000000c42099b910 RCX: 00007f4a53e48000 RDX: fffffffffffffffe RSI: 0000000001877c58 RDI: 000000c42099b1d0 RBP: 000000c42099b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000093effa R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 000000c42099bac0 random: crng init done EXT4-fs (sda1): re-mounted. Opts: (null) EXT4-fs (sda1): re-mounted. Opts: (null)