kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 20285 Comm: syz-executor3 Not tainted 4.20.0-rc7-next-20181224 #187 kobject: 'loop4' (000000006337158a): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop4' (000000006337158a): fill_kobj_path: path = '/devices/virtual/block/loop4' RIP: 0010:transparent_hugepage_enabled+0x8c/0x5e0 mm/huge_memory.c:69 Code: 80 3c 02 00 0f 85 ae 04 00 00 4c 8b a3 a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 91 04 00 00 49 8b bc 24 b8 01 00 00 e8 2d 70 e6 RSP: 0018:ffff888186f27138 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8881cd696d68 RCX: ffffc90005b04000 RDX: 0000000000000037 RSI: ffffffff81c8fa1a RDI: 00000000000001b8 RBP: ffff888186f27160 R08: ffffed10318b187d R09: ffffed10318b187c R10: ffffed10318b187c R11: ffff88818c58c3e3 R12: 0000000000000000 R13: ffff8881cd696e08 R14: dffffc0000000000 R15: 00000000000046d8 FS: 00007f62ea68d700(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd451874848 CR3: 00000001b4027000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: show_smap+0x167/0x580 fs/proc/task_mmu.c:805 traverse+0x344/0x7b0 fs/seq_file.c:113 seq_read+0xc76/0x1150 fs/seq_file.c:188 do_loop_readv_writev fs/read_write.c:700 [inline] do_iter_read+0x4bc/0x670 fs/read_write.c:924 vfs_readv+0x175/0x1c0 fs/read_write.c:986 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x539/0xb20 fs/splice.c:417 ------------[ cut here ]------------ downgrading a read lock WARNING: CPU: 0 PID: 20291 at kernel/locking/lockdep.c:3553 __lock_downgrade kernel/locking/lockdep.c:3553 [inline] WARNING: CPU: 0 PID: 20291 at kernel/locking/lockdep.c:3553 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3816