ia32_sys_call+0x13f8/0x1bb0 arch/x86/include/generated/asm/syscalls_32.h:253 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1444! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6721 Comm: syz.2.454 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:folio_get include/linux/mm.h:1444 [inline] RIP: 0010:get_page include/linux/mm.h:1450 [inline] RIP: 0010:iter_folioq_get_pages lib/iov_iter.c:1030 [inline] RIP: 0010:__iov_iter_get_pages_alloc+0x1d10/0x2230 lib/iov_iter.c:1201 Code: b0 8b 48 89 df e8 f0 23 4b fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 40 75 05 fd 48 c7 c6 a0 c6 b0 8b 4c 89 e7 e8 d1 23 4b fd 90 <0f> 0b e8 29 75 05 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc9000622ea30 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90026ab3000 RDX: 0000000000040000 RSI: ffffffff84873a3f RDI: ffff88801e68a884 RBP: ffffea00019d52b4 R08: 0000000000000001 R09: fffffbfff2d315b7 R10: ffffffff9698adbf R11: ffffffff815f4a4e R12: ffffea00019d5280 R13: ffff888060920c00 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5746b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000056ea2448 CR3: 000000002723c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: iov_iter_get_pages_alloc2+0x53/0xf0 lib/iov_iter.c:1225 p9_get_mapped_pages.part.0.constprop.0+0x4ca/0x7d0 net/9p/trans_virtio.c:333 p9_get_mapped_pages net/9p/trans_virtio.c:318 [inline] p9_virtio_zc_request+0x991/0x1460 net/9p/trans_virtio.c:458 p9_client_zc_rpc.constprop.0+0x29a/0x880 net/9p/client.c:808 p9_client_read_once+0x443/0x820 net/9p/client.c:1560 p9_client_read+0x13f/0x1b0 net/9p/client.c:1524 v9fs_issue_read+0x115/0x310 fs/9p/vfs_addr.c:74 netfs_read_to_pagecache+0x5c9/0x9a0 fs/netfs/buffered_read.c:287 netfs_readahead+0x7fa/0xaa0 fs/netfs/buffered_read.c:437 read_pages+0x1a8/0xd80 mm/readahead.c:160 page_cache_ra_unbounded+0x543/0x6c0 mm/readahead.c:257 do_page_cache_ra mm/readahead.c:320 [inline] page_cache_ra_order+0x7d9/0xc90 mm/readahead.c:520 page_cache_async_ra+0x5cb/0x820 mm/readahead.c:670 do_async_mmap_readahead mm/filemap.c:3230 [inline] filemap_fault+0xd02/0x2820 mm/filemap.c:3329 __do_fault+0x10a/0x490 mm/memory.c:4876 do_read_fault mm/memory.c:5282 [inline] do_fault mm/memory.c:5416 [inline] do_pte_missing+0xea8/0x3e50 mm/memory.c:3965 handle_pte_fault mm/memory.c:5751 [inline] __handle_mm_fault+0x100a/0x2a10 mm/memory.c:5894 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6062 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x126/0x230 mm/gup.c:2235 Code: 38 ba ff 48 39 dd 0f 84 f0 00 00 00 45 31 f6 eb 11 e8 1e 38 ba ff 48 81 c3 00 10 00 00 48 39 eb 74 1d e8 0d 38 ba ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 3a 3a ba ff 45 85 ff 74 d2 e8 RSP: 0018:ffffc9000622fb08 EFLAGS: 00050246 RAX: 0000000000040000 RBX: 00000000208ae000 RCX: ffffc90026ab3000 RDX: 0000000000040000 RSI: ffffffff81d27763 RDI: 0000000000000005 RBP: 0000000020a01000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000001cd000 R13: 00000000208330c0 R14: 0000000000000000 R15: 0000000000000000 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x21b/0x920 mm/filemap.c:4044 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3221 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x6b5/0x1140 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf745e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f574656c EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 RDX: 000000006db6e559 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:folio_get include/linux/mm.h:1444 [inline] RIP: 0010:get_page include/linux/mm.h:1450 [inline] RIP: 0010:iter_folioq_get_pages lib/iov_iter.c:1030 [inline] RIP: 0010:__iov_iter_get_pages_alloc+0x1d10/0x2230 lib/iov_iter.c:1201 Code: b0 8b 48 89 df e8 f0 23 4b fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 40 75 05 fd 48 c7 c6 a0 c6 b0 8b 4c 89 e7 e8 d1 23 4b fd 90 <0f> 0b e8 29 75 05 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc9000622ea30 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90026ab3000 RDX: 0000000000040000 RSI: ffffffff84873a3f RDI: ffff88801e68a884 RBP: ffffea00019d52b4 R08: 0000000000000001 R09: fffffbfff2d315b7 R10: ffffffff9698adbf R11: ffffffff815f4a4e R12: ffffea00019d5280 R13: ffff888060920c00 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5746b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000056ea2448 CR3: 000000002723c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 38 ba ff 48 39 dd cmp %bh,-0x22c6b701(%rdx) 6: 0f 84 f0 00 00 00 je 0xfc c: 45 31 f6 xor %r14d,%r14d f: eb 11 jmp 0x22 11: e8 1e 38 ba ff call 0xffba3834 16: 48 81 c3 00 10 00 00 add $0x1000,%rbx 1d: 48 39 eb cmp %rbp,%rbx 20: 74 1d je 0x3f 22: e8 0d 38 ba ff call 0xffba3834 27: 45 89 f7 mov %r14d,%r15d * 2a: 8a 03 mov (%rbx),%al <-- trapping instruction 2c: 31 ff xor %edi,%edi 2e: 44 89 fe mov %r15d,%esi 31: 88 44 24 28 mov %al,0x28(%rsp) 35: e8 3a 3a ba ff call 0xffba3a74 3a: 45 85 ff test %r15d,%r15d 3d: 74 d2 je 0x11 3f: e8 .byte 0xe8