blkdev_ioctl+0x437/0x6d0 block/ioctl.c:688 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:871! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 16823 Comm: syz.3.2215 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870 Code: 14 c8 ff 4c 89 e7 48 c7 c6 e0 61 74 8b e8 9b fe 2f ff 90 0f 0b e8 d3 14 c8 ff 4c 89 e7 48 c7 c6 c0 58 74 8b e8 84 fe 2f ff 90 <0f> 0b e8 bc 14 c8 ff 4c 89 e7 48 c7 c6 e0 61 74 8b e8 6d fe 2f ff RSP: 0018:ffffc9000b9873a0 EFLAGS: 00010246 RAX: 0a6e57af5294c500 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d70bf1d RDI: 00000000ffffffff RBP: ffffc9000b987508 R08: ffffffff8f7cd477 R09: 1ffffffff1ef9a8e R10: dffffc0000000000 R11: fffffbfff1ef9a8f R12: ffffea0001882580 R13: dffffc0000000000 R14: ffffea0001882588 R15: 0000000000000004 FS: 00007f46283d56c0(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000180 CR3: 000000005ca9b000 CR4: 0000000000350ef0 Call Trace: filemap_add_folio+0x26d/0x540 mm/filemap.c:978 ra_alloc_folio mm/readahead.c:453 [inline] page_cache_ra_order+0x6bc/0xe70 mm/readahead.c:512 do_sync_mmap_readahead+0x25e/0x7a0 mm/filemap.c:-1 filemap_fault+0x6b9/0x12b0 mm/filemap.c:3489 __do_fault+0x138/0x390 mm/memory.c:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6318 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0xb7/0x290 lib/strncpy_from_user.c:130 Code: 00 00 4c 89 f6 e8 09 c7 fe fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 e4 4c 89 fb <4f> 8b 34 27 48 b8 ff fe fe fe fe fe fe fe 4d 8d 3c 06 4d 89 f5 49 RSP: 0018:ffffc9000b987d10 EFLAGS: 00050246 RAX: ffffffff84c14247 RBX: 0000200000000000 RCX: ffff8880333b0000 RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: fffffffffffffff8 R08: ffff8880622dc2ff R09: 1ffff1100c45b85f R10: dffffc0000000000 R11: ffffed100c45b860 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000fe0 R15: 0000200000000000 getname_flags+0xf3/0x540 fs/namei.c:157 getname include/linux/fs.h:2922 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1431 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f462a18d810 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44 RSP: 002b:00007f46283d4df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007f462a18d810 RDX: 0000000000010000 RSI: 0000200000000000 RDI: 00000000ffffff9c RBP: 0000200000000000 R08: 0000000000000000 R09: 000000000200008f R10: 0000000000000000 R11: 0000000000000293 R12: 0000200000000000 R13: 00007f46283d4eb0 R14: 0000000000000554 R15: 00002000000003c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870 Code: 14 c8 ff 4c 89 e7 48 c7 c6 e0 61 74 8b e8 9b fe 2f ff 90 0f 0b e8 d3 14 c8 ff 4c 89 e7 48 c7 c6 c0 58 74 8b e8 84 fe 2f ff 90 <0f> 0b e8 bc 14 c8 ff 4c 89 e7 48 c7 c6 e0 61 74 8b e8 6d fe 2f ff RSP: 0018:ffffc9000b9873a0 EFLAGS: 00010246 RAX: 0a6e57af5294c500 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d70bf1d RDI: 00000000ffffffff RBP: ffffc9000b987508 R08: ffffffff8f7cd477 R09: 1ffffffff1ef9a8e R10: dffffc0000000000 R11: fffffbfff1ef9a8f R12: ffffea0001882580 R13: dffffc0000000000 R14: ffffea0001882588 R15: 0000000000000004 FS: 00007f46283d56c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000019680 CR3: 000000005ca9b000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4c 89 f6 mov %r14,%rsi 5: e8 09 c7 fe fc call 0xfcfec713 a: 49 83 fe 07 cmp $0x7,%r14 e: 0f 86 9d 00 00 00 jbe 0xb1 14: 48 89 1c 24 mov %rbx,(%rsp) 18: 4c 89 74 24 08 mov %r14,0x8(%rsp) 1d: 48 c7 c5 f8 ff ff ff mov $0xfffffffffffffff8,%rbp 24: 45 31 e4 xor %r12d,%r12d 27: 4c 89 fb mov %r15,%rbx * 2a: 4f 8b 34 27 mov (%r15,%r12,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 4d 8d 3c 06 lea (%r14,%rax,1),%r15 3c: 4d 89 f5 mov %r14,%r13 3f: 49 rex.WB