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: 5432 Comm: syz.1.9 Not tainted 6.12.0-rc1-syzkaller-00042-gf23aa4c0761a #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 d0 23 4b fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 20 75 05 fd 48 c7 c6 60 c6 b0 8b 4c 89 e7 e8 b1 23 4b fd 90 <0f> 0b e8 09 75 05 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc90003f86fa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: ffff88802496c880 RSI: ffffffff84873a5f RDI: ffff88802496ccc4 RBP: ffffea00004c3eb4 R08: 0000000000000001 R09: fffffbfff2d315ad R10: ffffffff9698ad6f R11: ffff88802b528a40 R12: ffffea00004c3e80 R13: ffff88802ab53400 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:0000000056d7e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000200002c0 CR3: 0000000061e3a000 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+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: 0023:0xf7152b0f Code: d8 09 c8 74 1d 89 c8 83 f0 01 09 d8 0f 85 c3 01 00 00 8b 44 24 28 31 f6 89 74 24 2c 0f c8 89 44 24 28 8b 44 24 50 8b 4c 24 28 <89> 08 e9 04 fb ff ff 0f b6 4c 24 18 8b 5c 24 30 89 cf c1 ef 05 83 RSP: 002b:00000000ffd151d0 EFLAGS: 00010246 RAX: 00000000200002c0 RBX: 0000000000000000 RCX: 0000000000000028 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000ffd154e8 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 d0 23 4b fd 90 0f 0b 49 89 c5 e9 99 f6 ff ff e8 20 75 05 fd 48 c7 c6 60 c6 b0 8b 4c 89 e7 e8 b1 23 4b fd 90 <0f> 0b e8 09 75 05 fd 4c 8b 64 24 48 49 83 ec 01 e9 94 fd ff ff 4c RSP: 0018:ffffc90003f86fa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: ffff88802496c880 RSI: ffffffff84873a5f RDI: ffff88802496ccc4 RBP: ffffea00004c3eb4 R08: 0000000000000001 R09: fffffbfff2d315ad R10: ffffffff9698ad6f R11: ffff88802b528a40 R12: ffffea00004c3e80 R13: ffff88802ab53400 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:0000000056d7e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000031eeaff8 CR3: 0000000061e3a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: d8 09 fmuls (%rcx) 2: c8 74 1d 89 enter $0x1d74,$0x89 6: c8 83 f0 01 enter $0xf083,$0x1 a: 09 d8 or %ebx,%eax c: 0f 85 c3 01 00 00 jne 0x1d5 12: 8b 44 24 28 mov 0x28(%rsp),%eax 16: 31 f6 xor %esi,%esi 18: 89 74 24 2c mov %esi,0x2c(%rsp) 1c: 0f c8 bswap %eax 1e: 89 44 24 28 mov %eax,0x28(%rsp) 22: 8b 44 24 50 mov 0x50(%rsp),%eax 26: 8b 4c 24 28 mov 0x28(%rsp),%ecx * 2a: 89 08 mov %ecx,(%rax) <-- trapping instruction 2c: e9 04 fb ff ff jmp 0xfffffb35 31: 0f b6 4c 24 18 movzbl 0x18(%rsp),%ecx 36: 8b 5c 24 30 mov 0x30(%rsp),%ebx 3a: 89 cf mov %ecx,%edi 3c: c1 ef 05 shr $0x5,%edi 3f: 83 .byte 0x83