| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <6986408f.050a0220.3b3015.0045.GAE@google.com> Date: Fri, 06 Feb 2026 11:27:11 -0800 From: syzbot ci <syzbot+ci580f4a2417fa7843@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, anshuman.khandual@....com, david@...nel.org, dev.jain@....com, kirill@...temov.name, liam.howlett@...cle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, lorenzo.stoakes@...cle.com, mhocko@...e.com, rppt@...nel.org, ryan.roberts@....com, surenb@...gle.com, vbabka@...e.cz, willy@...radead.org Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: mm: map maximum pages possible in finish_fault syzbot ci has tested the following series [v1] mm: map maximum pages possible in finish_fault https://lore.kernel.org/all/20260206135648.38164-1-dev.jain@arm.com * [PATCH] mm: map maximum pages possible in finish_fault and found the following issue: WARNING in folio_add_file_rmap_ptes Full report is available here: https://ci.syzbot.org/series/72be5e3b-2ee7-4758-9574-5c09e110d6d0 *** WARNING in folio_add_file_rmap_ptes tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 7235a985b8126d891dbd4e7f20546ff3002b6363 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/7bf34a11-2b89-440d-9047-d9a8b7d52cbc/config C repro: https://ci.syzbot.org/findings/b307b537-ffd9-403f-b188-852c8f39be62/c_repro syz repro: https://ci.syzbot.org/findings/b307b537-ffd9-403f-b188-852c8f39be62/syz_repro ------------[ cut here ]------------ nr_pages <= 0 WARNING: ./include/linux/rmap.h:349 at __folio_rmap_sanity_checks include/linux/rmap.h:349 [inline], CPU#0: syz.0.17/5977 WARNING: ./include/linux/rmap.h:349 at __folio_add_rmap mm/rmap.c:1350 [inline], CPU#0: syz.0.17/5977 WARNING: ./include/linux/rmap.h:349 at __folio_add_file_rmap mm/rmap.c:1696 [inline], CPU#0: syz.0.17/5977 WARNING: ./include/linux/rmap.h:349 at folio_add_file_rmap_ptes+0x98a/0xe60 mm/rmap.c:1722, CPU#0: syz.0.17/5977 Modules linked in: CPU: 0 UID: 0 PID: 5977 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:__folio_rmap_sanity_checks include/linux/rmap.h:349 [inline] RIP: 0010:__folio_add_rmap mm/rmap.c:1350 [inline] RIP: 0010:__folio_add_file_rmap mm/rmap.c:1696 [inline] RIP: 0010:folio_add_file_rmap_ptes+0x98a/0xe60 mm/rmap.c:1722 Code: 0b 90 e9 4c f7 ff ff e8 84 d1 ab ff 48 89 df 48 c7 c6 e0 44 9a 8b e8 d5 3e 11 ff 90 0f 0b 90 e9 9d f7 ff ff e8 67 d1 ab ff 90 <0f> 0b 90 e9 b2 f7 ff ff e8 59 d1 ab ff 49 ff cf e9 ea f7 ff ff e8 RSP: 0018:ffffc90003f675f0 EFLAGS: 00010293 RAX: ffffffff8216c889 RBX: ffffea000412fa00 RCX: ffff8881170c3a80 RDX: 0000000000000000 RSI: 00000000fb412000 RDI: 0000000000000001 RBP: 00000000fb412000 R08: f888304bee000000 R09: 1ffffd4000825f46 R10: dffffc0000000000 R11: fffff94000825f47 R12: dffffc0000000000 R13: ffffea000412fa30 R14: ffffea000412fa00 R15: 0000000000104be8 FS: 0000555589649500(0000) GS:ffff88818e324000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000040 CR3: 0000000114846000 CR4: 00000000000006f0 Call Trace: <TASK> set_pte_range+0x538/0x8a0 mm/memory.c:5526 finish_fault+0xec7/0x1290 mm/memory.c:5668 do_read_fault mm/memory.c:5808 [inline] do_fault mm/memory.c:5938 [inline] do_pte_missing+0x216f/0x3210 mm/memory.c:4479 handle_pte_fault mm/memory.c:6322 [inline] __handle_mm_fault mm/memory.c:6460 [inline] handle_mm_fault+0x1b8c/0x32b0 mm/memory.c:6629 do_user_addr_fault+0x75b/0x1340 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:rep_movs_alternative+0x51/0x90 arch/x86/lib/copy_user_64.S:81 Code: 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 eb 05 c3 cc cc cc cc <48> 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 RSP: 0018:ffffc90003f67cf8 EFLAGS: 00010202 RAX: 00007ffffffff001 RBX: 0000000000000050 RCX: 0000000000000050 RDX: 0000000000000001 RSI: 0000200000000040 RDI: ffffc90003f67d60 RBP: ffffc90003f67eb8 R08: ffffc90003f67daf R09: 1ffff920007ecfb5 R10: dffffc0000000000 R11: fffff520007ecfb6 R12: dffffc0000000000 R13: 0000000000000050 R14: ffffc90003f67d60 R15: 0000200000000040 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:185 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:223 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] __sys_bpf+0x229/0x920 kernel/bpf/syscall.c:6137 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4fb5d9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe24ca9848 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f4fb6015fa0 RCX: 00007f4fb5d9acb9 RDX: 0000000000000050 RSI: 0000200000000040 RDI: 0000000000000000 RBP: 00007f4fb5e08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4fb6015fac R14: 00007f4fb6015fa0 R15: 00007f4fb6015fa0 </TASK> ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 0f 1f 00 nopl (%rax) 9: 48 8b 06 mov (%rsi),%rax c: 48 89 07 mov %rax,(%rdi) f: 48 83 c6 08 add $0x8,%rsi 13: 48 83 c7 08 add $0x8,%rdi 17: 83 e9 08 sub $0x8,%ecx 1a: 74 db je 0xfffffff7 1c: 83 f9 08 cmp $0x8,%ecx 1f: 73 e8 jae 0x9 21: eb c5 jmp 0xffffffe8 23: eb 05 jmp 0x2a 25: c3 ret 26: cc int3 27: cc int3 28: cc int3 29: cc int3 * 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction 2d: 48 89 07 mov %rax,(%rdi) 30: 48 8d 47 08 lea 0x8(%rdi),%rax 34: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 38: 48 29 f8 sub %rdi,%rax 3b: 48 01 c7 add %rax,%rdi 3e: 48 rex.W 3f: 01 .byte 0x1 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
Powered by blists - more mailing lists