kswapd_shrink_node mm/vmscan.c:6742 [inline] balance_pgdat+0xc19/0x18f0 mm/vmscan.c:6934 kswapd+0x5ea/0xbf0 mm/vmscan.c:7203 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1460! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 7212 Comm: syz.2.461 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #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:1460 [inline] RIP: 0010:get_page include/linux/mm.h:1466 [inline] RIP: 0010:iter_folioq_get_pages lib/iov_iter.c:1030 [inline] RIP: 0010:__iov_iter_get_pages_alloc+0x1d1e/0x2240 lib/iov_iter.c:1201 Code: b0 8b 48 89 df e8 32 4b 4e fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 f2 db 09 fd 48 c7 c6 20 44 b0 8b 4c 89 e7 e8 13 4b 4e fd 90 <0f> 0b e8 db db 09 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc90003a76e78 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000008 RCX: ffffc90004d49000 RDX: 0000000000040000 RSI: ffffffff848148dd RDI: ffff888024d02884 RBP: ffffea0000ad9434 R08: 0000000000000001 R09: fffffbfff2d27914 R10: ffffffff9693c8a7 R11: ffff88802b828a40 R12: ffffea0000ad9400 R13: ffff88805f4f9400 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5716b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ffef7c70 CR3: 00000000270c0000 CR4: 0000000000350ef0 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+0x454/0x5a0 mm/readahead.c:242 do_page_cache_ra mm/readahead.c:303 [inline] page_cache_ra_order+0x6b5/0xb80 mm/readahead.c:488 do_sync_mmap_readahead mm/filemap.c:3182 [inline] filemap_fault+0x12e1/0x2650 mm/filemap.c:3321 __do_fault+0x10a/0x490 mm/memory.c:4672 do_read_fault mm/memory.c:5078 [inline] do_fault mm/memory.c:5208 [inline] do_pte_missing mm/memory.c:3964 [inline] handle_pte_fault mm/memory.c:5538 [inline] __handle_mm_fault+0x3b47/0x5470 mm/memory.c:5681 handle_mm_fault+0x498/0xa60 mm/memory.c:5849 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:copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:125 [inline] RIP: 0010:_inline_copy_from_user include/linux/uaccess.h:163 [inline] RIP: 0010:_copy_from_user+0xc1/0xf0 lib/usercopy.c:18 Code: 89 df e8 52 80 08 fd 4d 85 f6 75 9e e8 98 7e 08 fd 0f ae e8 89 ee 4c 89 ef e8 6b 16 67 fd 0f 01 cb 48 89 e9 4c 89 ef 48 89 de a4 0f 1f 00 48 89 cb 0f 01 ca e9 73 ff ff ff e8 6a 7e 08 fd 48 RSP: 0018:ffffc90003a77e10 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 0000000020000280 RCX: 0000000000000280 RDX: 0000000000000000 RSI: 0000000020001000 RDI: ffff88802b408d80 RBP: 0000000000001000 R08: 0000000000000001 R09: ffffed10056811ff R10: ffff88802b408fff R11: 0000000000000000 R12: 0000000020001280 R13: ffff88802b408000 R14: 0000000000000000 R15: 0000000000000000 copy_from_user include/linux/uaccess.h:196 [inline] copy_mount_options+0x76/0x190 fs/namespace.c:3716 __do_sys_mount fs/namespace.c:4050 [inline] __se_sys_mount fs/namespace.c:4032 [inline] __ia32_sys_mount+0x1ad/0x310 fs/namespace.c:4032 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: 0023:0xf742e579 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:00000000f571656c EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000000 RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000020000280 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:1460 [inline] RIP: 0010:get_page include/linux/mm.h:1466 [inline] RIP: 0010:iter_folioq_get_pages lib/iov_iter.c:1030 [inline] RIP: 0010:__iov_iter_get_pages_alloc+0x1d1e/0x2240 lib/iov_iter.c:1201 Code: b0 8b 48 89 df e8 32 4b 4e fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 f2 db 09 fd 48 c7 c6 20 44 b0 8b 4c 89 e7 e8 13 4b 4e fd 90 <0f> 0b e8 db db 09 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc90003a76e78 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000008 RCX: ffffc90004d49000 RDX: 0000000000040000 RSI: ffffffff848148dd RDI: ffff888024d02884 RBP: ffffea0000ad9434 R08: 0000000000000001 R09: fffffbfff2d27914 R10: ffffffff9693c8a7 R11: ffff88802b828a40 R12: ffffea0000ad9400 R13: ffff88805f4f9400 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f5716b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ffef8054 CR3: 00000000270c0000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 df mov %ebx,%edi 2: e8 52 80 08 fd call 0xfd088059 7: 4d 85 f6 test %r14,%r14 a: 75 9e jne 0xffffffaa c: e8 98 7e 08 fd call 0xfd087ea9 11: 0f ae e8 lfence 14: 89 ee mov %ebp,%esi 16: 4c 89 ef mov %r13,%rdi 19: e8 6b 16 67 fd call 0xfd671689 1e: 0f 01 cb stac 21: 48 89 e9 mov %rbp,%rcx 24: 4c 89 ef mov %r13,%rdi 27: 48 89 de mov %rbx,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 48 89 cb mov %rcx,%rbx 32: 0f 01 ca clac 35: e9 73 ff ff ff jmp 0xffffffad 3a: e8 6a 7e 08 fd call 0xfd087ea9 3f: 48 rex.W