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Message-ID: <6888af6b.050a0220.73271.0002.GAE@google.com> Date: Tue, 29 Jul 2025 04:24:27 -0700 From: syzbot <syzbot+fdba5cca73fee92c69d6@...kaller.appspotmail.com> To: brauner@...nel.org, jack@...e.cz, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk Subject: [syzbot] [fs?] kernel BUG in mpage_readahead Hello, syzbot found the following issue on: HEAD commit: 25fae0b93d1d Merge tag 'drm-fixes-2025-07-24' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152d70a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=859f36d9ccbeaa3e dashboard link: https://syzkaller.appspot.com/bug?extid=fdba5cca73fee92c69d6 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dc00f98ff419/disk-25fae0b9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/05e43f05893a/vmlinux-25fae0b9.xz kernel image: https://storage.googleapis.com/syzbot-assets/3b079c14e6b9/bzImage-25fae0b9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fdba5cca73fee92c69d6@...kaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1379! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 10369 Comm: syz.3.1129 Not tainted 6.16.0-rc7-syzkaller-00034-g25fae0b93d1d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__readahead_folio include/linux/pagemap.h:1379 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1405 [inline] RIP: 0010:mpage_readahead+0x637/0x650 fs/mpage.c:367 Code: c6 a0 d9 99 8b e8 69 13 c1 ff 90 0f 0b e8 b1 e6 7c ff 4c 89 ef 48 c7 c6 00 da 99 8b e8 52 13 c1 ff 90 0f 0b e8 9a e6 7c ff 90 <0f> 0b e8 92 e6 7c ff 90 0f 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 RSP: 0018:ffffc90003876f40 EFLAGS: 00010246 RAX: ffffffff82433f16 RBX: 0000000000000001 RCX: 0000000000080000 RDX: ffffc90010f1f000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90003877130 R08: ffffea00016fac07 R09: 1ffffd40002df580 R10: dffffc0000000000 R11: fffff940002df581 R12: dffffc0000000000 R13: ffffc900038773a8 R14: 0000000000000010 R15: ffffc900038773c0 FS: 00007f969af276c0(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe3f14b6fe0 CR3: 0000000030d80000 CR4: 00000000003526f0 Call Trace: <TASK> read_pages+0x177/0x580 mm/readahead.c:160 page_cache_ra_unbounded+0x346/0x7b0 mm/readahead.c:264 do_sync_mmap_readahead+0x370/0x5f0 mm/filemap.c:3247 filemap_fault+0x62a/0x1200 mm/filemap.c:3412 __do_fault+0x135/0x390 mm/memory.c:5169 do_read_fault mm/memory.c:5590 [inline] do_fault mm/memory.c:5724 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault+0x37ed/0x5620 mm/memory.c:6212 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60 Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 2e 0f 1f 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 RSP: 0018:ffffc90003877a18 EFLAGS: 00050206 RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038 RDX: 0000000000000001 RSI: 0000200000391000 RDI: ffffc90003877aa0 RBP: ffffc90003877c30 R08: ffffc90003877ad7 R09: 1ffff9200070ef5a R10: dffffc0000000000 R11: fffff5200070ef5b R12: 0000000000000002 R13: dffffc0000000000 R14: ffffc90003877aa0 R15: 0000200000391000 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:178 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user net/socket.c:2496 [inline] recvmsg_copy_msghdr net/socket.c:2752 [inline] ___sys_recvmsg+0x12e/0x510 net/socket.c:2824 do_recvmmsg+0x307/0x770 net/socket.c:2923 __sys_recvmmsg net/socket.c:2997 [inline] __do_sys_recvmmsg net/socket.c:3020 [inline] __se_sys_recvmmsg net/socket.c:3013 [inline] __x64_sys_recvmmsg+0x190/0x240 net/socket.c:3013 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f969a18e9a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f969af27038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f969a3b6080 RCX: 00007f969a18e9a9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f969a210d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f969a3b6080 R15: 00007ffd46031bf8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1379 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1405 [inline] RIP: 0010:mpage_readahead+0x637/0x650 fs/mpage.c:367 Code: c6 a0 d9 99 8b e8 69 13 c1 ff 90 0f 0b e8 b1 e6 7c ff 4c 89 ef 48 c7 c6 00 da 99 8b e8 52 13 c1 ff 90 0f 0b e8 9a e6 7c ff 90 <0f> 0b e8 92 e6 7c ff 90 0f 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 RSP: 0018:ffffc90003876f40 EFLAGS: 00010246 RAX: ffffffff82433f16 RBX: 0000000000000001 RCX: 0000000000080000 RDX: ffffc90010f1f000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90003877130 R08: ffffea00016fac07 R09: 1ffffd40002df580 R10: dffffc0000000000 R11: fffff940002df581 R12: dffffc0000000000 R13: ffffc900038773a8 R14: 0000000000000010 R15: ffffc900038773c0 FS: 00007f969af276c0(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe3f1497d58 CR3: 0000000030d80000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 83 f9 08 cmp $0x8,%ecx 3: 73 25 jae 0x2a 5: 85 c9 test %ecx,%ecx 7: 74 0f je 0x18 9: 8a 06 mov (%rsi),%al b: 88 07 mov %al,(%rdi) d: 48 ff c7 inc %rdi 10: 48 ff c6 inc %rsi 13: 48 ff c9 dec %rcx 16: 75 f1 jne 0x9 18: c3 ret 19: cc int3 1a: cc int3 1b: cc int3 1c: cc int3 1d: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 24: 00 00 00 27: 0f 1f 00 nopl (%rax) * 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction 2d: 48 89 07 mov %rax,(%rdi) 30: 48 83 c6 08 add $0x8,%rsi 34: 48 83 c7 08 add $0x8,%rdi 38: 83 e9 08 sub $0x8,%ecx 3b: 74 db je 0x18 3d: 83 f9 08 cmp $0x8,%ecx --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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