kill_bdev block/bdev.c:91 [inline] set_blocksize+0x2b8/0x500 block/bdev.c:207 blkdev_bszset+0x19b/0x240 block/ioctl.c:554 blkdev_ioctl+0x44e/0x6d0 block/ioctl.c:688 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:867! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 27918 Comm: syz.8.5446 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:867 Code: 78 c8 ff 48 c7 c6 e0 23 b9 8b 4c 89 ef e8 9d 28 11 00 90 0f 0b e8 15 78 c8 ff 48 c7 c6 40 24 b9 8b 4c 89 ef e8 86 28 11 00 90 <0f> 0b e8 fe 77 c8 ff 90 0f 0b 90 e9 f2 fb ff ff e8 f0 77 c8 ff 48 RSP: 0000:ffffc90012d77440 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc90014222000 RDX: 0000000000080000 RSI: ffffffff81f313fa RDI: ffff88806f692884 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90ab5297 R11: 0000000000000000 R12: 0000000000000002 R13: ffffea0000ec0c00 R14: 0000000000000000 R15: 000000000000000c FS: 00007f1fb24f46c0(0000) GS:ffff8881247b8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e0f6ff8 CR3: 000000006c865000 CR4: 00000000003526f0 Call Trace: filemap_add_folio+0x10e/0x220 mm/filemap.c:969 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x5a7/0xd70 mm/readahead.c:506 do_sync_mmap_readahead mm/filemap.c:3304 [inline] filemap_fault+0x152e/0x2930 mm/filemap.c:3445 __do_fault+0x10d/0x490 mm/memory.c:5152 do_shared_fault mm/memory.c:5637 [inline] do_fault mm/memory.c:5711 [inline] do_pte_missing+0x1a6/0x3ba0 mm/memory.c:4234 handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195 handle_mm_fault+0x589/0xd10 mm/memory.c:6364 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x90 arch/x86/lib/copy_user_64.S:61 Code: 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb RSP: 0018:ffffc90012d77c38 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff520025aef97 RSI: ffffc90012d77cb0 RDI: 000020000001cdb8 RBP: 000020000001cdb8 R08: 0000000000000000 R09: fffff520025aef96 R10: ffffc90012d77cb7 R11: 0000000000000000 R12: ffffc90012d77cb0 R13: 000020000001cdc0 R14: 00007ffffffff000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0xbb/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] msr_read+0x14e/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1e4/0xcf0 fs/read_write.c:570 ksys_read+0x12a/0x250 fs/read_write.c:715 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1fb158ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1fb24f4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1fb17c5fa0 RCX: 00007f1fb158ebe9 RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000005 RBP: 00007f1fb1611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1fb17c6038 R14: 00007f1fb17c5fa0 R15: 00007ffe9ef34768 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:867 Code: 78 c8 ff 48 c7 c6 e0 23 b9 8b 4c 89 ef e8 9d 28 11 00 90 0f 0b e8 15 78 c8 ff 48 c7 c6 40 24 b9 8b 4c 89 ef e8 86 28 11 00 90 <0f> 0b e8 fe 77 c8 ff 90 0f 0b 90 e9 f2 fb ff ff e8 f0 77 c8 ff 48 RSP: 0000:ffffc90012d77440 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc90014222000 RDX: 0000000000080000 RSI: ffffffff81f313fa RDI: ffff88806f692884 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90ab5297 R11: 0000000000000000 R12: 0000000000000002 R13: ffffea0000ec0c00 R14: 0000000000000000 R15: 000000000000000c FS: 00007f1fb24f46c0(0000) GS:ffff8881247b8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000004b000 CR3: 000000006c865000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 73 25 jae 0x27 2: 85 c9 test %ecx,%ecx 4: 74 0f je 0x15 6: 8a 06 mov (%rsi),%al 8: 88 07 mov %al,(%rdi) a: 48 ff c7 inc %rdi d: 48 ff c6 inc %rsi 10: 48 ff c9 dec %rcx 13: 75 f1 jne 0x6 15: c3 ret 16: cc int3 17: cc int3 18: cc int3 19: cc int3 1a: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 21: 00 00 00 00 25: 66 90 xchg %ax,%ax 27: 48 8b 06 mov (%rsi),%rax * 2a: 48 89 07 mov %rax,(%rdi) <-- trapping instruction 2d: 48 83 c6 08 add $0x8,%rsi 31: 48 83 c7 08 add $0x8,%rdi 35: 83 e9 08 sub $0x8,%ecx 38: 74 db je 0x15 3a: 83 f9 08 cmp $0x8,%ecx 3d: 73 e8 jae 0x27 3f: eb .byte 0xeb