kswapd_shrink_node mm/vmscan.c:6765 [inline] balance_pgdat+0xc19/0x18f0 mm/vmscan.c:6957 kswapd+0x5ea/0xbf0 mm/vmscan.c:7226 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:1444! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 UID: 0 PID: 5462 Comm: syz.2.16 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:ffffc9000439efa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: ffff888020b52440 RSI: ffffffff84873a3f RDI: ffff888020b52884 RBP: ffffea0000487934 R08: 0000000000000001 R09: fffffbfff2d315b0 R10: ffffffff9698ad87 R11: ffff88802b628a40 R12: ffffea0000487900 R13: ffff888000252c00 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:000000005794e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000a80 CR3: 000000006067c000 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+0x3c0/0x6c0 mm/readahead.c:290 do_page_cache_ra mm/readahead.c:320 [inline] page_cache_ra_order+0x7d9/0xc90 mm/readahead.c:520 do_sync_mmap_readahead mm/filemap.c:3202 [inline] filemap_fault+0x148d/0x2820 mm/filemap.c:3343 __do_fault+0x10a/0x490 mm/memory.c:4876 do_shared_fault mm/memory.c:5346 [inline] do_fault mm/memory.c:5420 [inline] do_pte_missing+0x1a8/0x3e50 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+0x60d/0x13f0 arch/x86/mm/fault.c:1338 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: 0023:0xf726243f Code: 03 00 00 00 74 02 a4 49 50 89 c8 c1 e9 02 83 e0 03 f3 a5 89 c1 f3 a4 58 89 c7 89 d6 8b 44 24 04 c3 d1 e9 73 01 a4 d1 e9 73 02 <66> a5 f3 a5 eb e8 66 90 66 90 66 90 66 90 66 90 90 8b 44 24 0c 39 RSP: 002b:00000000ff8e228c EFLAGS: 00010207 RAX: 0000000000000000 RBX: 00000000f741bff4 RCX: 0000000000000003 RDX: 000000000000000e RSI: 00000000f6d224eb RDI: 0000000020000a80 RBP: 00000000ff8e2508 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 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:ffffc9000439efa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: ffff888020b52440 RSI: ffffffff84873a3f RDI: ffff888020b52884 RBP: ffffea0000487934 R08: 0000000000000001 R09: fffffbfff2d315b0 R10: ffffffff9698ad87 R11: ffff88802b628a40 R12: ffffea0000487900 R13: ffff888000252c00 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:000000005794e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055d222a79950 CR3: 000000006067c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 00 add (%rax),%eax 2: 00 00 add %al,(%rax) 4: 74 02 je 0x8 6: a4 movsb %ds:(%rsi),%es:(%rdi) 7: 49 50 rex.WB push %r8 9: 89 c8 mov %ecx,%eax b: c1 e9 02 shr $0x2,%ecx e: 83 e0 03 and $0x3,%eax 11: f3 a5 rep movsl %ds:(%rsi),%es:(%rdi) 13: 89 c1 mov %eax,%ecx 15: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 17: 58 pop %rax 18: 89 c7 mov %eax,%edi 1a: 89 d6 mov %edx,%esi 1c: 8b 44 24 04 mov 0x4(%rsp),%eax 20: c3 ret 21: d1 e9 shr %ecx 23: 73 01 jae 0x26 25: a4 movsb %ds:(%rsi),%es:(%rdi) 26: d1 e9 shr %ecx 28: 73 02 jae 0x2c * 2a: 66 a5 movsw %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: f3 a5 rep movsl %ds:(%rsi),%es:(%rdi) 2e: eb e8 jmp 0x18 30: 66 90 xchg %ax,%ax 32: 66 90 xchg %ax,%ax 34: 66 90 xchg %ax,%ax 36: 66 90 xchg %ax,%ax 38: 66 90 xchg %ax,%ax 3a: 90 nop 3b: 8b 44 24 0c mov 0xc(%rsp),%eax 3f: 39 .byte 0x39