------------[ cut here ]------------ kernel BUG at mm/khugepaged.c:469! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6853 Comm: syz-executor790 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__khugepaged_enter+0x306/0x3d0 mm/khugepaged.c:469 Code: e4 49 81 fe c0 b3 c9 89 74 2a e8 c5 75 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 b2 75 bb ff 48 89 ef e8 ea d5 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 9b 75 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc90005407a50 EFLAGS: 00010286 RAX: 000000000000034b RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff8880871c25c0 RSI: ffffffff815dafc7 RDI: fffff52000a80ee9 RBP: ffff8880976ca240 R08: 000000000000034b R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 00000000000768c8 R12: ffff888094ae1000 R13: ffff8880976ca29c R14: 0000000020000000 R15: ffffc90005407b88 FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000f7f3fb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000009e3b0d4 CR3: 00000000a9333000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: khugepaged_enter include/linux/khugepaged.h:62 [inline] do_huge_pmd_anonymous_page+0xaa1/0x2230 mm/huge_memory.c:706 create_huge_pmd mm/memory.c:4106 [inline] __handle_mm_fault mm/memory.c:4330 [inline] handle_mm_fault+0x369d/0x4590 mm/memory.c:4457 do_user_addr_fault+0x598/0xbf0 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0xa8/0x160 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffffc90005407d98 EFLAGS: 00010206 RAX: 0000000000000001 RBX: 0000000020000000 RCX: 0000000000000052 RDX: 0000000000000052 RSI: ffff88809dfd1800 RDI: 0000000020000000 RBP: ffff88809dfd1800 R08: 0000000000000000 R09: ffff88809dfd1851 R10: ffffed1013bfa30a R11: 0000000000000000 R12: 0000000000000052 R13: 0000000020000052 R14: 00007ffffffff000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:74 [inline] _copy_to_user+0x11e/0x160 lib/usercopy.c:30 copy_to_user include/linux/uaccess.h:168 [inline] syslog_print_all kernel/printk/printk.c:1508 [inline] do_syslog.part.0+0xf85/0x16c0 kernel/printk/printk.c:1579 do_syslog kernel/printk/printk.c:1654 [inline] __do_sys_syslog kernel/printk/printk.c:1656 [inline] __se_sys_syslog kernel/printk/printk.c:1654 [inline] __ia32_sys_syslog+0x9c/0xd0 kernel/printk/printk.c:1654 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline] __do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f44549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7f3f1fc EFLAGS: 00000246 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000000 RDX: 00000000000000ce RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000003d0f00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 987c299cde5b1299 ]--- RIP: 0010:__khugepaged_enter+0x306/0x3d0 mm/khugepaged.c:469 Code: e4 49 81 fe c0 b3 c9 89 74 2a e8 c5 75 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 b2 75 bb ff 48 89 ef e8 ea d5 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 9b 75 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc90005407a50 EFLAGS: 00010286 RAX: 000000000000034b RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff8880871c25c0 RSI: ffffffff815dafc7 RDI: fffff52000a80ee9 RBP: ffff8880976ca240 R08: 000000000000034b R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 00000000000768c8 R12: ffff888094ae1000 R13: ffff8880976ca29c R14: 0000000020000000 R15: ffffc90005407b88 FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000f7f3fb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007feb9dc39010 CR3: 00000000a9333000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400