------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:142! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 3 PID: 20842 Comm: syz-executor.1 Not tainted 6.4.0-rc2-syzkaller-00290-gd635f6cc934b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:__page_table_check_zero+0x175/0x1c0 mm/page_table_check.c:142 Code: 24 08 80 38 00 75 47 48 03 2d 17 d3 04 10 49 83 c4 01 e9 00 ff ff ff e8 99 4e a2 ff 0f 0b e8 92 4e a2 ff 0f 0b e8 8b 4e a2 ff <0f> 0b e8 84 4e a2 ff 0f 0b e8 7d 4e a2 ff 48 89 ef 48 83 c4 10 5b RSP: 0018:ffffc900290ffa88 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc9000d3a4000 RDX: 0000000000040000 RSI: ffffffff81e1f445 RDI: 0000000000000005 RBP: ffff88801398f060 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000004 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802c900000(0063) knlGS:00000000f7facb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000576c1404 CR3: 0000000028e41000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: page_table_check_free include/linux/page_table_check.h:46 [inline] free_pages_prepare mm/page_alloc.c:1303 [inline] free_unref_page_prepare+0x70f/0xcb0 mm/page_alloc.c:2564 free_unref_page+0x33/0x370 mm/page_alloc.c:2659 hcd_buffer_free+0x1b9/0x250 drivers/usb/core/buffer.c:163 usb_free_coherent+0x6b/0x80 drivers/usb/core/usb.c:1035 dec_usb_memory_use_count+0x253/0x3f0 drivers/usb/core/devio.c:197 mmap_region+0x1ad4/0x28d0 mm/mmap.c:2773 do_mmap+0x831/0xf60 mm/mmap.c:1394 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1440 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7fb1579 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 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7fac5cc EFLAGS: 00000296 ORIG_RAX: 00000000000000c0 RAX: ffffffffffffffda RBX: 0000000020ffa000 RCX: 0000000000003000 RDX: 0000000000000002 RSI: 0000000000000012 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__page_table_check_zero+0x175/0x1c0 mm/page_table_check.c:142 Code: 24 08 80 38 00 75 47 48 03 2d 17 d3 04 10 49 83 c4 01 e9 00 ff ff ff e8 99 4e a2 ff 0f 0b e8 92 4e a2 ff 0f 0b e8 8b 4e a2 ff <0f> 0b e8 84 4e a2 ff 0f 0b e8 7d 4e a2 ff 48 89 ef 48 83 c4 10 5b RSP: 0018:ffffc900290ffa88 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc9000d3a4000 RDX: 0000000000040000 RSI: ffffffff81e1f445 RDI: 0000000000000005 RBP: ffff88801398f060 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000004 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7facb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f734e1b0 CR3: 0000000028e41000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi