start_brk 222e000 brk 2251000 start_stack 7ffc3d4b5bf0 arg_start 7ffc3d4b6ec3 arg_end 7ffc3d4b6edb env_start 7ffc3d4b6edb env_end 7ffc3d4b6fe0 binfmt ffffffff89d6d5e0 flags cd core_state ffffc90005537c18 ioctx_table 0000000000000000 owner ffff88809e2c0440 exe_file ffff88809778a540 ------------[ cut here ]------------ kernel BUG at mm/khugepaged.c:469! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 6857 Comm: syz-executor227 Not tainted 5.9.0-rc1-next-20200817-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 20 c0 d2 89 74 2a e8 15 62 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 02 62 bb ff 48 89 ef e8 7a c6 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 eb 61 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc900054b7930 EFLAGS: 00010282 RAX: 0000000000000365 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff88809a09a580 RSI: ffffffff815d9107 RDI: fffff52000a96ec5 RBP: ffff88809ef37740 R08: 0000000000000365 R09: ffff8880ae7318e7 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888092cba160 R13: ffff88809ef3779c R14: 0000000020000000 R15: ffffc900054b7a68 FS: 00007f9fbb0ff700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16a4bb9000 CR3: 00000000a873b000 CR4: 00000000001506e0 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:707 create_huge_pmd mm/memory.c:4106 [inline] __handle_mm_fault mm/memory.c:4333 [inline] handle_mm_fault+0x3684/0x4580 mm/memory.c:4460 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_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:91 Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffffc900054b7c78 EFLAGS: 00010206 RAX: 0000000000000001 RBX: 0000000020000000 RCX: 0000000000000006 RDX: 0000000000000001 RSI: ffff8880a11e3000 RDI: 0000000020000000 RBP: ffff8880a11e3000 R08: 322020205b3e353c R09: ffff8880a11e3030 R10: ffffed101423c606 R11: 0000000000000000 R12: 0000000000000031 R13: 0000000020000031 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:58 [inline] _copy_to_user+0x11e/0x160 lib/usercopy.c:30 copy_to_user include/linux/uaccess.h:168 [inline] syslog_print_all+0x34c/0x590 kernel/printk/printk.c:1545 do_syslog.part.0+0x3ff/0x8d0 kernel/printk/printk.c:1610 do_syslog kernel/printk/printk.c:1682 [inline] __do_sys_syslog kernel/printk/printk.c:1684 [inline] __se_sys_syslog kernel/printk/printk.c:1682 [inline] __x64_sys_syslog+0x97/0xc0 kernel/printk/printk.c:1682 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4467d9 Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9fbb0fedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467d9 RDX: 00000000000000ce RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000006dbc20 R08: 00007f9fbb0ff700 R09: 0000000000000000 R10: 00007f9fbb0ff700 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffc3d4b59bf R14: 00007f9fbb0ff9c0 R15: 000000000000002d Modules linked in: ---[ end trace 8ed1e7849c65b9f6 ]--- RIP: 0010:__khugepaged_enter+0x306/0x3d0 mm/khugepaged.c:469 Code: e4 49 81 fe 20 c0 d2 89 74 2a e8 15 62 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 02 62 bb ff 48 89 ef e8 7a c6 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 eb 61 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc900054b7930 EFLAGS: 00010282 RAX: 0000000000000365 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff88809a09a580 RSI: ffffffff815d9107 RDI: fffff52000a96ec5 RBP: ffff88809ef37740 R08: 0000000000000365 R09: ffff8880ae7318e7 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888092cba160 R13: ffff88809ef3779c R14: 0000000020000000 R15: ffffc900054b7a68 FS: 00007f9fbb0ff700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16a4bcf000 CR3: 00000000a873b000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400