------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1398! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 10810 Comm: syz.8.1234 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__readahead_folio include/linux/pagemap.h:1398 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1424 [inline] RIP: 0010:mpage_readahead+0x399/0x590 fs/mpage.c:367 Code: 24 84 c0 74 08 3c 03 0f 8e 61 01 00 00 44 8b 7b 20 89 ef 44 89 fe e8 b6 55 72 ff 41 39 ef 0f 83 9f fd ff ff e8 28 5b 72 ff 90 <0f> 0b e8 20 5b 72 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 RSP: 0018:ffffc90003136d50 EFLAGS: 00010283 RAX: 0000000000024326 RBX: ffffc90003137268 RCX: ffffc900105fa000 RDX: 0000000000080000 RSI: ffffffff8248bd98 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc9000313728c R14: fffff52000626e51 R15: 0000000000000001 FS: 00007f3b29fcd6c0(0000) GS:ffff888124f72000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b346fdff8 CR3: 000000007a61f000 CR4: 0000000000350ef0 Call Trace: read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_unbounded+0x5d2/0x7d0 mm/readahead.c:264 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0xa41/0xd70 mm/readahead.c:529 page_cache_async_ra+0x69c/0xa00 mm/readahead.c:689 do_async_mmap_readahead mm/filemap.c:3332 [inline] filemap_fault+0xd42/0x2930 mm/filemap.c:3431 __do_fault+0x10d/0x490 mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing+0xf50/0x3ba0 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:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] RIP: 0010:copy_from_user_iter lib/iov_iter.c:55 [inline] RIP: 0010:iterate_ubuf include/linux/iov_iter.h:30 [inline] RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:302 [inline] RIP: 0010:iterate_and_advance include/linux/iov_iter.h:330 [inline] RIP: 0010:__copy_from_iter lib/iov_iter.c:249 [inline] RIP: 0010:_copy_from_iter+0x37e/0x1720 lib/iov_iter.c:260 Code: fd 4d 85 f6 0f 85 52 ff ff ff e8 7d 3b 20 fd 4c 8b 74 24 18 89 de 4c 89 f7 e8 9e c9 86 fd 0f 01 cb 48 89 d9 4c 89 f7 48 89 ee a4 0f 1f 00 48 89 cd 0f 01 ca 49 89 df 49 29 cf e9 22 ff ff ff RSP: 0018:ffffc90003137778 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 000000000000fef4 RCX: 0000000000008074 RDX: ffffed1008a6dfe1 RSI: 0000200000008000 RDI: ffff888045367e90 RBP: 0000200000000180 R08: 0000000000000001 R09: ffffed1008a6dfe0 R10: ffff88804536ff03 R11: 0000000000000000 R12: ffffc90003137d80 R13: 0000200000010074 R14: ffff888045360010 R15: 00007ffffffff000 copy_from_iter include/linux/uio.h:228 [inline] copy_from_iter_full include/linux/uio.h:245 [inline] sctp_user_addto_chunk+0x84/0x240 net/sctp/sm_make_chunk.c:1557 sctp_datamsg_from_user+0x5b6/0x1320 net/sctp/chunk.c:269 sctp_sendmsg_to_asoc+0xaf4/0x1bf0 net/sctp/socket.c:1860 sctp_sendmsg+0xea2/0x1e10 net/sctp/socket.c:2032 inet_sendmsg+0x11c/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] __sys_sendto+0x43c/0x520 net/socket.c:2231 __do_sys_sendto net/socket.c:2238 [inline] __se_sys_sendto net/socket.c:2234 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2234 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3b2918eec9 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:00007f3b29fcd038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f3b293e6180 RCX: 00007f3b2918eec9 RDX: 0000000000034000 RSI: 0000200000000180 RDI: 0000000000000003 RBP: 00007f3b29211f91 R08: 0000200000000480 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3b293e6218 R14: 00007f3b293e6180 R15: 00007fff2ca6dcf8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1398 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1424 [inline] RIP: 0010:mpage_readahead+0x399/0x590 fs/mpage.c:367 Code: 24 84 c0 74 08 3c 03 0f 8e 61 01 00 00 44 8b 7b 20 89 ef 44 89 fe e8 b6 55 72 ff 41 39 ef 0f 83 9f fd ff ff e8 28 5b 72 ff 90 <0f> 0b e8 20 5b 72 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 RSP: 0018:ffffc90003136d50 EFLAGS: 00010283 RAX: 0000000000024326 RBX: ffffc90003137268 RCX: ffffc900105fa000 RDX: 0000000000080000 RSI: ffffffff8248bd98 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc9000313728c R14: fffff52000626e51 R15: 0000000000000001 FS: 00007f3b29fcd6c0(0000) GS:ffff888124f72000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4a4618f98 CR3: 000000007a61f000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: fd std 1: 4d 85 f6 test %r14,%r14 4: 0f 85 52 ff ff ff jne 0xffffff5c a: e8 7d 3b 20 fd call 0xfd203b8c f: 4c 8b 74 24 18 mov 0x18(%rsp),%r14 14: 89 de mov %ebx,%esi 16: 4c 89 f7 mov %r14,%rdi 19: e8 9e c9 86 fd call 0xfd86c9bc 1e: 0f 01 cb stac 21: 48 89 d9 mov %rbx,%rcx 24: 4c 89 f7 mov %r14,%rdi 27: 48 89 ee mov %rbp,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 48 89 cd mov %rcx,%rbp 32: 0f 01 ca clac 35: 49 89 df mov %rbx,%r15 38: 49 29 cf sub %rcx,%r15 3b: e9 22 ff ff ff jmp 0xffffff62