------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1404! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 29751 Comm: syz.0.5883 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__readahead_folio include/linux/pagemap.h:1404 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1430 [inline] RIP: 0010:mpage_readahead+0x765/0x790 fs/mpage.c:367 Code: c6 c0 f8 b9 8b e8 9b 20 e0 fe 90 0f 0b e8 23 af 78 ff 4c 89 ff 48 c7 c6 a0 f7 b9 8b e8 84 20 e0 fe 90 0f 0b e8 0c af 78 ff 90 <0f> 0b e8 04 af 78 ff 4c 89 ff 48 c7 c6 c0 f8 b9 8b e8 65 20 e0 fe RSP: 0018:ffffc9000420ef60 EFLAGS: 00010246 RAX: ffffffff8247dfc4 RBX: 0000000000000004 RCX: 0000000000080000 RDX: ffffc9002215a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000420f150 R08: ffffea00011aed07 R09: 1ffffd4000235da0 R10: dffffc0000000000 R11: fffff94000235da1 R12: ffffc9000420f3c8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc9000420f3e0 FS: 00007f792d1976c0(0000) GS:ffff8881259ff000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002d3030 CR3: 0000000057bd6000 CR4: 00000000003526f0 Call Trace: read_pages+0x177/0x580 mm/readahead.c:160 page_cache_ra_unbounded+0x346/0x7b0 mm/readahead.c:264 do_sync_mmap_readahead+0x3aa/0x7a0 mm/filemap.c:3257 filemap_fault+0x6b9/0x12b0 mm/filemap.c:3458 __do_fault+0x138/0x390 mm/memory.c:5280 do_read_fault mm/memory.c:5703 [inline] do_fault mm/memory.c:5837 [inline] do_pte_missing mm/memory.c:4362 [inline] handle_pte_fault mm/memory.c:6182 [inline] __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6323 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6492 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+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 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 e9 0d 33 04 00 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: 0018:ffffc9000420fa18 EFLAGS: 00050206 RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038 RDX: 0000000000000001 RSI: 000020000036c000 RDI: ffffc9000420faa0 RBP: ffffc9000420fc30 R08: ffffc9000420fad7 R09: 1ffff92000841f5a R10: dffffc0000000000 R11: fffff52000841f5b R12: 0000000000000002 R13: dffffc0000000000 R14: ffffc9000420faa0 R15: 000020000036c000 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/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f792c38ebe9 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:00007f792d197038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f792c5b6090 RCX: 00007f792c38ebe9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f792c411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f792c5b6128 R14: 00007f792c5b6090 R15: 00007ffc47870138 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1404 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1430 [inline] RIP: 0010:mpage_readahead+0x765/0x790 fs/mpage.c:367 Code: c6 c0 f8 b9 8b e8 9b 20 e0 fe 90 0f 0b e8 23 af 78 ff 4c 89 ff 48 c7 c6 a0 f7 b9 8b e8 84 20 e0 fe 90 0f 0b e8 0c af 78 ff 90 <0f> 0b e8 04 af 78 ff 4c 89 ff 48 c7 c6 c0 f8 b9 8b e8 65 20 e0 fe RSP: 0018:ffffc9000420ef60 EFLAGS: 00010246 RAX: ffffffff8247dfc4 RBX: 0000000000000004 RCX: 0000000000080000 RDX: ffffc9002215a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000420f150 R08: ffffea00011aed07 R09: 1ffffd4000235da0 R10: dffffc0000000000 R11: fffff94000235da1 R12: ffffc9000420f3c8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc9000420f3e0 FS: 00007f792d1976c0(0000) GS:ffff8881259ff000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002d3030 CR3: 0000000057bd6000 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: e9 0d 33 04 00 jmp 0x4332a 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