collapse_file+0x1d8/0x2bc0 mm/khugepaged.c:1801 hpage_collapse_scan_file+0x489/0xf00 mm/khugepaged.c:2299 madvise_collapse+0x4c6/0xac0 mm/khugepaged.c:2742 madvise_vma_behavior+0x35f/0x18b0 mm/madvise.c:1094 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:1507! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 2 PID: 5782 Comm: syz-executor.3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:folio_unlock mm/filemap.c:1507 [inline] RIP: 0010:folio_unlock+0xb3/0xd0 mm/filemap.c:1502 Code: 33 5b cd ff 48 89 ef 31 f6 e8 59 eb ff ff 5b 5d e9 22 5b cd ff e8 1d 5b cd ff 48 c7 c6 20 b8 37 8b 48 89 ef e8 4e 21 11 00 90 <0f> 0b 48 89 df e8 d3 8d 2a 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00 RSP: 0018:ffffc90004d7f470 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801bbac880 RSI: ffffffff81c134c2 RDI: ffff88801bbaccc4 RBP: ffffea0000add3c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8fe2cb97 R11: 0000000000000000 R12: ffff888011e83288 R13: ffffea0000add3c0 R14: 00000000fffffff4 R15: 00000000fffffff4 FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5e65b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000003222c000 CR3: 0000000057890000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __extent_writepage fs/btrfs/extent_io.c:1519 [inline] extent_write_cache_pages+0x10fd/0x1ce0 fs/btrfs/extent_io.c:2173 btrfs_writepages+0x21b/0x4a0 fs/btrfs/extent_io.c:2294 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2634 filemap_fdatawrite_wbc mm/filemap.c:397 [inline] filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430 filemap_write_and_wait_range mm/filemap.c:685 [inline] filemap_write_and_wait_range+0xa3/0x130 mm/filemap.c:676 filemap_write_and_wait include/linux/pagemap.h:66 [inline] fiemap_prep+0x1ba/0x220 fs/ioctl.c:195 btrfs_fiemap+0x88/0x200 fs/btrfs/inode.c:7900 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x404/0x1a90 fs/ioctl.c:841 __do_compat_sys_ioctl+0x149/0x330 fs/ioctl.c:1001 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7273579 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:00000000f5e655ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000c020660b RDX: 0000000020000180 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:folio_unlock mm/filemap.c:1507 [inline] RIP: 0010:folio_unlock+0xb3/0xd0 mm/filemap.c:1502 Code: 33 5b cd ff 48 89 ef 31 f6 e8 59 eb ff ff 5b 5d e9 22 5b cd ff e8 1d 5b cd ff 48 c7 c6 20 b8 37 8b 48 89 ef e8 4e 21 11 00 90 <0f> 0b 48 89 df e8 d3 8d 2a 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00 RSP: 0018:ffffc90004d7f470 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801bbac880 RSI: ffffffff81c134c2 RDI: ffff88801bbaccc4 RBP: ffffea0000add3c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8fe2cb97 R11: 0000000000000000 R12: ffff888011e83288 R13: ffffea0000add3c0 R14: 00000000fffffff4 R15: 00000000fffffff4 FS: 0000000000000000(0000) GS:ffff88802c100000(0063) knlGS:00000000f5e65b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000005769604c CR3: 0000000057890000 CR4: 0000000000350ef0 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 ret 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