__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1f2/0x3b0 mm/slub.c:4262 __alloc_skb+0x1c2/0x480 net/core/skbuff.c:658 alloc_skb_fclone include/linux/skbuff.h:1390 [inline] tcp_stream_alloc_skb+0x3d/0x310 net/ipv4/tcp.c:894 tcp_sendmsg_locked+0xd96/0x5030 net/ipv4/tcp.c:1176 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1366 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:727 sock_write_iter+0x2d9/0x3f0 net/socket.c:1131 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x711/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:868! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5835 Comm: syz-executor162 Not tainted 6.15.0-rc2-syzkaller-00493-gac71fabf1567 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__filemap_add_folio+0x1554/0x16c0 mm/filemap.c:867 Code: e9 c5 ff 4c 89 e7 48 c7 c6 80 0e 54 8c e8 44 43 12 00 90 0f 0b e8 cc e9 c5 ff 4c 89 e7 48 c7 c6 00 05 54 8c e8 2d 43 12 00 90 <0f> 0b e8 b5 e9 c5 ff 4c 89 e7 48 c7 c6 80 0e 54 8c e8 16 43 12 00 RSP: 0018:ffffc90003ed6c80 EFLAGS: 00010246 RAX: 41df80658db96e00 RBX: 0000000000000004 RCX: ffffffff93686020 RDX: dffffc0000000000 RSI: ffffffff8e6497f7 RDI: 0000000000000001 RBP: ffffc90003ed6e30 R08: ffffffff905fe577 R09: 1ffffffff20bfcae R10: dffffc0000000000 R11: fffffbfff20bfcaf R12: ffffea0000d21600 R13: ffffc90003ed6d80 R14: 0000000000000002 R15: dffffc0000000000 FS: 00007ff44d3b26c0(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000005b7000 CR3: 000000007f668000 CR4: 0000000000350ef0 Call Trace: filemap_add_folio+0x157/0x380 mm/filemap.c:969 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x76c/0xca0 mm/readahead.c:509 do_async_mmap_readahead mm/filemap.c:3290 [inline] filemap_fault+0x6ce/0x13d0 mm/filemap.c:3389 __do_fault+0x137/0x390 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault+0x3f0c/0x61c0 mm/memory.c:5997 __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1129/0x1bf0 mm/memory.c:6309 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2bb/0x920 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x177/0x2e0 mm/gup.c:2241 Code: 49 81 c5 ff 0f 00 00 49 81 e5 00 f0 ff ff 49 39 c5 0f 82 85 00 00 00 e8 97 f6 b2 ff 4c 39 eb 0f 84 88 00 00 00 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 3e 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc90003ed7860 EFLAGS: 00050287 RAX: ffffffff820fc689 RBX: 00002000005b7000 RCX: ffff88802a8cbc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003ed7918 R08: ffffffff820fc620 R09: ffffffff85017739 R10: 0000000000000002 R11: ffff88802a8cbc00 R12: 0000000000000240 R13: 00002000005b8000 R14: 1ffff920007daf14 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x8a4/0xa10 mm/filemap.c:4152 ext4_buffered_write_iter+0xc7/0x390 fs/ext4/file.c:299 ext4_file_write_iter+0x97f/0x1da0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x711/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff44d3f94e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff44d3b2218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff44d483328 RCX: 00007ff44d3f94e9 RDX: 000000000208e24b RSI: 0000200000000240 RDI: 0000000000000004 RBP: 00007ff44d483320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff44d450074 R13: 0000200000000240 R14: 0000200000000000 R15: 0000200000000100 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x1554/0x16c0 mm/filemap.c:867 Code: e9 c5 ff 4c 89 e7 48 c7 c6 80 0e 54 8c e8 44 43 12 00 90 0f 0b e8 cc e9 c5 ff 4c 89 e7 48 c7 c6 00 05 54 8c e8 2d 43 12 00 90 <0f> 0b e8 b5 e9 c5 ff 4c 89 e7 48 c7 c6 80 0e 54 8c e8 16 43 12 00 RSP: 0018:ffffc90003ed6c80 EFLAGS: 00010246 RAX: 41df80658db96e00 RBX: 0000000000000004 RCX: ffffffff93686020 RDX: dffffc0000000000 RSI: ffffffff8e6497f7 RDI: 0000000000000001 RBP: ffffc90003ed6e30 R08: ffffffff905fe577 R09: 1ffffffff20bfcae R10: dffffc0000000000 R11: fffffbfff20bfcaf R12: ffffea0000d21600 R13: ffffc90003ed6d80 R14: 0000000000000002 R15: dffffc0000000000 FS: 00007ff44d3b26c0(0000) GS:ffff88812509a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff44d435190 CR3: 000000007f668000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 49 81 c5 ff 0f 00 00 add $0xfff,%r13 7: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13 e: 49 39 c5 cmp %rax,%r13 11: 0f 82 85 00 00 00 jb 0x9c 17: e8 97 f6 b2 ff call 0xffb2f6b3 1c: 4c 39 eb cmp %r13,%rbx 1f: 0f 84 88 00 00 00 je 0xad 25: 4c 89 64 24 10 mov %r12,0x10(%rsp) * 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2d: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 32: 84 c0 test %al,%al 34: 75 18 jne 0x4e 36: 44 88 64 24 40 mov %r12b,0x40(%rsp) 3b: 48 rex.W 3c: 81 .byte 0x81 3d: c3 ret 3e: 00 10 add %dl,(%rax)