worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:868! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 7192 Comm: syz.1.318 Not tainted 6.16.0-next-20250808-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:867 Code: 50 c9 ff 4c 89 e7 48 c7 c6 e0 3c 94 8b e8 7b 98 31 ff 90 0f 0b e8 13 50 c9 ff 4c 89 e7 48 c7 c6 c0 33 94 8b e8 64 98 31 ff 90 <0f> 0b e8 fc 4f c9 ff 4c 89 e7 48 c7 c6 e0 3c 94 8b e8 4d 98 31 ff RSP: 0018:ffffc9001b14f0a0 EFLAGS: 00010246 RAX: 6ddf70b179095200 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d9b8efe RDI: 00000000ffffffff RBP: ffffc9001b14f210 R08: ffffffff8fa39a37 R09: 1ffffffff1f47346 R10: dffffc0000000000 R11: fffffbfff1f47347 R12: ffffea0001eddcc0 R13: dffffc0000000000 R14: ffffea0001eddcc8 R15: 0000000000000004 FS: 00007f63b9d8d6c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93929d5d58 CR3: 000000007e35e000 CR4: 00000000003526f0 Call Trace: filemap_add_folio+0xd5/0x270 mm/filemap.c:969 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x643/0xd40 mm/readahead.c:506 do_sync_mmap_readahead+0x25e/0x7a0 mm/filemap.c:-1 filemap_fault+0x62c/0x1200 mm/filemap.c:3446 __do_fault+0x138/0x390 mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x3611/0x5440 mm/memory.c:6195 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60 Code: 83 f9 08 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 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 RSP: 0000:ffffc9001b14fa18 EFLAGS: 00050206 RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038 RDX: 0000000000000001 RSI: 00002000002bc000 RDI: ffffc9001b14faa0 RBP: ffffc9001b14fc30 R08: ffffc9001b14fad7 R09: 1ffff92003629f5a R10: dffffc0000000000 R11: fffff52003629f5b R12: 0000000000000002 R13: dffffc0000000000 R14: ffffc9001b14faa0 R15: 00002000002bc000 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user net/socket.c:2544 [inline] recvmsg_copy_msghdr net/socket.c:2800 [inline] ___sys_recvmsg+0x12e/0x510 net/socket.c:2872 do_recvmmsg+0x307/0x770 net/socket.c:2971 __sys_recvmmsg net/socket.c:3045 [inline] __do_sys_recvmmsg net/socket.c:3068 [inline] __se_sys_recvmmsg net/socket.c:3061 [inline] __x64_sys_recvmmsg+0x190/0x240 net/socket.c:3061 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f63b8f8ebe9 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:00007f63b9d8d038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f63b91b6090 RCX: 00007f63b8f8ebe9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f63b9011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f63b91b6128 R14: 00007f63b91b6090 R15: 00007ffe71175a08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:867 Code: 50 c9 ff 4c 89 e7 48 c7 c6 e0 3c 94 8b e8 7b 98 31 ff 90 0f 0b e8 13 50 c9 ff 4c 89 e7 48 c7 c6 c0 33 94 8b e8 64 98 31 ff 90 <0f> 0b e8 fc 4f c9 ff 4c 89 e7 48 c7 c6 e0 3c 94 8b e8 4d 98 31 ff RSP: 0018:ffffc9001b14f0a0 EFLAGS: 00010246 RAX: 6ddf70b179095200 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d9b8efe RDI: 00000000ffffffff RBP: ffffc9001b14f210 R08: ffffffff8fa39a37 R09: 1ffffffff1f47346 R10: dffffc0000000000 R11: fffffbfff1f47347 R12: ffffea0001eddcc0 R13: dffffc0000000000 R14: ffffea0001eddcc8 R15: 0000000000000004 FS: 00007f63b9d8d6c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558b4925c8 CR3: 000000007e35e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 83 f9 08 cmp $0x8,%ecx 3: 73 25 jae 0x2a 5: 85 c9 test %ecx,%ecx 7: 74 0f je 0x18 9: 8a 06 mov (%rsi),%al b: 88 07 mov %al,(%rdi) d: 48 ff c7 inc %rdi 10: 48 ff c6 inc %rsi 13: 48 ff c9 dec %rcx 16: 75 f1 jne 0x9 18: c3 ret 19: cc int3 1a: cc int3 1b: cc int3 1c: cc int3 1d: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 24: 00 00 00 27: 0f 1f 00 nopl (%rax) * 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction 2d: 48 89 07 mov %rax,(%rdi) 30: 48 83 c6 08 add $0x8,%rsi 34: 48 83 c7 08 add $0x8,%rdi 38: 83 e9 08 sub $0x8,%ecx 3b: 74 db je 0x18 3d: 83 f9 08 cmp $0x8,%ecx