------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1408! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 6721 Comm: syz.1.189 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367 Code: 5e 41 5f e9 55 72 16 09 e8 00 35 70 ff 48 89 ef e8 68 1c ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 e4 34 70 ff 90 <0f> 0b e8 dc 34 70 ff 48 c7 c6 00 b7 a0 8b 48 89 ef e8 8d 4d ba ff RSP: 0018:ffffc9001b8170c0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: ffffc9001b817538 RCX: ffffc9000d53c000 RDX: 0000000000080000 RSI: ffffffff824cd56c RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: fffff52003702eab R14: 0000000000000001 R15: 1ffff92003702eab FS: 00007f584c08f6c0(0000) GS:ffff888124b0a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000030f030 CR3: 000000002500f000 CR4: 00000000003526f0 Call Trace: read_pages+0x1c4/0xc70 mm/readahead.c:163 page_cache_ra_unbounded+0x66a/0xa10 mm/readahead.c:269 do_page_cache_ra mm/readahead.c:332 [inline] page_cache_sync_ra+0xab3/0xbf0 mm/readahead.c:611 do_sync_mmap_readahead mm/filemap.c:3288 [inline] filemap_fault+0x1fe3/0x29a0 mm/filemap.c:3489 __do_fault+0x10d/0x490 mm/memory.c:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing+0xf4a/0x3ba0 mm/memory.c:4361 handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6318 handle_mm_fault+0x589/0xd10 mm/memory.c:6487 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+0x64/0xc0 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 4d 3c 04 00 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 RSP: 0018:ffffc9001b817a48 EFLAGS: 00050206 RAX: 0000000000000001 RBX: 00002000002fe000 RCX: 0000000000000038 RDX: fffff52003702f5a RSI: 00002000002fe000 RDI: ffffc9001b817a98 RBP: 0000000000000038 R08: 0000000000000001 R09: fffff52003702f59 R10: ffffc9001b817acf R11: 0000000000000001 R12: 0000000000000000 R13: ffffc9001b817a98 R14: ffffc9001b817b80 R15: ffffc9001b817a98 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+0x98/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user+0x98/0x160 net/socket.c:2560 recvmsg_copy_msghdr net/socket.c:2816 [inline] ___sys_recvmsg+0xdb/0x1a0 net/socket.c:2888 do_recvmmsg+0x2fe/0x750 net/socket.c:2987 __sys_recvmmsg net/socket.c:3061 [inline] __do_sys_recvmmsg net/socket.c:3084 [inline] __se_sys_recvmmsg net/socket.c:3077 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3077 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f584b18efc9 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:00007f584c08f038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f584b3e6090 RCX: 00007f584b18efc9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f584b211f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f584b3e6128 R14: 00007f584b3e6090 R15: 00007ffe0c28d138 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367 Code: 5e 41 5f e9 55 72 16 09 e8 00 35 70 ff 48 89 ef e8 68 1c ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 e4 34 70 ff 90 <0f> 0b e8 dc 34 70 ff 48 c7 c6 00 b7 a0 8b 48 89 ef e8 8d 4d ba ff RSP: 0018:ffffc9001b8170c0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: ffffc9001b817538 RCX: ffffc9000d53c000 RDX: 0000000000080000 RSI: ffffffff824cd56c RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: fffff52003702eab R14: 0000000000000001 R15: 1ffff92003702eab FS: 00007f584c08f6c0(0000) GS:ffff888124b0a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcee0db3ad8 CR3: 000000002500f000 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 4d 3c 04 00 jmp 0x43c6a 1d: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 24: 00 00 00 00 28: 66 90 xchg %ax,%ax * 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