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: 1 UID: 0 PID: 6726 Comm: syz.2.328 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:ffffc9002201eba0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90003d29000 RDX: 0000000000040000 RSI: ffffffff848148dd RDI: ffff888021668444 RBP: ffffea0000add334 R08: 0000000000000001 R09: fffffbfff2d27910 R10: ffffffff9693c887 R11: ffff88802b728a40 R12: ffffea0000add300 R13: ffff88802216f800 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f56d6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002003c000 CR3: 0000000027be4000 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+0x2d8/0x5a0 mm/readahead.c:273 do_page_cache_ra mm/readahead.c:303 [inline] page_cache_ra_order+0x6b5/0xb80 mm/readahead.c:488 page_cache_sync_ra+0x4b4/0x9c0 mm/readahead.c:576 page_cache_sync_readahead include/linux/pagemap.h:1298 [inline] filemap_get_pages+0xbfb/0x1830 mm/filemap.c:2529 filemap_splice_read+0x5cc/0xd00 mm/filemap.c:2901 v9fs_file_splice_read+0x95/0xe0 fs/9p/vfs_file.c:386 do_splice_read fs/splice.c:985 [inline] do_splice_read+0x282/0x370 fs/splice.c:959 splice_direct_to_actor+0x2a4/0xa40 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x178/0x250 fs/splice.c:1233 do_sendfile+0xb0a/0xe40 fs/read_write.c:1388 __do_compat_sys_sendfile fs/read_write.c:1476 [inline] __se_compat_sys_sendfile fs/read_write.c:1459 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1459 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: 0023:0xf7f57579 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:00000000f56d656c EFLAGS: 00000296 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 000000007ffff000 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: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:ffffc9002201eba0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90003d29000 RDX: 0000000000040000 RSI: ffffffff848148dd RDI: ffff888021668444 RBP: ffffea0000add334 R08: 0000000000000001 R09: fffffbfff2d27910 R10: ffffffff9693c887 R11: ffff88802b728a40 R12: ffffea0000add300 R13: ffff88802216f800 R14: 0000000000001000 R15: 0000000000001000 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f56d6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055d1f36128c8 CR3: 0000000027be4000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi