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Wed, 29 Oct 2025 10:59:27 -0700 (PDT) Date: Wed, 29 Oct 2025 10:59:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690255ff.050a0220.32483.0218.GAE@google.com> Subject: [syzbot] [net?] kernel BUG in filemap_fault (3) From: syzbot To: akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 958A7A000C X-Stat-Signature: t8s79kng1khr4yr8cwu51abg4odofuks X-Rspam-User: X-HE-Tag: 1761760768-49221 X-HE-Meta: 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 3FRgoCHf 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 aSZt1IQ2 9SnoTcPNwLS0VyxcI2PhHELhTnNIurj4WabYLLoRAvJgt95BGJaiCwbJctUETn5eSgU4RuHn5X6loO9zju/pFlMAmfNOWj3PNncactA3mhrH6NCnb/HD5ocSFfd4EuZdX8KpgNysPbDZEpUyGCUYj7LIDcl6WrhLV7d7kk0eON5IA08qz93dm5rzh/eFRVgJ2HTg7vXgFb+b0YvntI/nN3ozf4O0VE9c5znuvzi+VY+vjTiHCVIWD6OQ01jtFAMp1/Tqev8q+hASqaykupzABGpQ77UvLrnLmpl/YFwrXIeVvtXbx8RKMQ6ZIQJB/eYIYl1gLP9hsg1eLeDvBE73vcGjG/cKvvK2tmf5QtH5aWoJOjyjgKHzJs0sKpArH6gwzH+l9mTx7wt+LcUolMMp5tDnubTdgo1TjaZEw/jHVj0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 72761a7e3122 Merge tag 'driver-core-6.18-rc3' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10241e7c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bd5b960ad8a33100 dashboard link: https://syzkaller.appspot.com/bug?extid=85cfa48c1a69a20ba5ed compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7340e06c0904/disk-72761a7e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0391e601c303/vmlinux-72761a7e.xz kernel image: https://storage.googleapis.com/syzbot-assets/7744957ba534/bzImage-72761a7e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+85cfa48c1a69a20ba5ed@syzkaller.appspotmail.com asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 page last free pid 50 tgid 50 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:2963 folios_put_refs+0x584/0x670 mm/swap.c:1002 release_pages+0x4b4/0x520 mm/swap.c:1042 io_free_region+0xb4/0x270 io_uring/memmap.c:102 io_rings_free io_uring/io_uring.c:2770 [inline] io_ring_ctx_free+0x287/0x4e0 io_uring/io_uring.c:2864 io_ring_exit_work+0x8c4/0x930 io_uring/io_uring.c:3086 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3519! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 9010 Comm: syz.1.736 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:filemap_fault+0x122c/0x12b0 mm/filemap.c:3519 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 8e d8 2c 00 e9 81 fc ff ff e8 94 23 c7 ff 48 89 df 48 c7 c6 60 5b 74 8b e8 b5 0d 2f ff 90 <0f> 0b e8 7d 23 c7 ff 48 8b 3c 24 48 c7 c6 e0 61 74 8b e8 9d 0d 2f RSP: 0018:ffffc9000ef37a60 EFLAGS: 00010246 RAX: 50465a4911af7d00 RBX: ffffea00012c8500 RCX: 50465a4911af7d00 RDX: 0000000000000000 RSI: ffffffff8d8f29fa RDI: ffff88801fba5ac0 RBP: ffffc9000ef37b98 R08: ffff8880b8924293 R09: 1ffff11017124852 R10: dffffc0000000000 R11: ffffed1017124853 R12: dffffc0000000000 R13: 1ffffd40002590a1 R14: ffffea00012c8518 R15: ffffea00012c8508 FS: 0000000000000000(0000) GS:ffff88812623e000(0063) knlGS:000000005671e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080000000 CR3: 00000000301ae000 CR4: 00000000003526f0 Call Trace: __do_fault+0x138/0x390 mm/memory.c:5280 do_shared_fault mm/memory.c:5762 [inline] do_fault mm/memory.c:5836 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x1847/0x5400 mm/memory.c:6318 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0023:0xf704df88 Code: f8 09 f0 74 1d 89 f0 83 f0 01 09 f8 0f 85 3c 02 00 00 8b 44 24 20 0f c8 89 44 24 20 31 c0 89 44 24 24 8b 44 24 1c 8b 4c 24 20 <89> 08 e9 39 fb ff ff 0f b6 4c 24 08 8b 5c 24 28 89 cf c1 ef 05 83 RSP: 002b:00000000f750fa70 EFLAGS: 00010246 RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000f750fd98 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x122c/0x12b0 mm/filemap.c:3519 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 8e d8 2c 00 e9 81 fc ff ff e8 94 23 c7 ff 48 89 df 48 c7 c6 60 5b 74 8b e8 b5 0d 2f ff 90 <0f> 0b e8 7d 23 c7 ff 48 8b 3c 24 48 c7 c6 e0 61 74 8b e8 9d 0d 2f RSP: 0018:ffffc9000ef37a60 EFLAGS: 00010246 RAX: 50465a4911af7d00 RBX: ffffea00012c8500 RCX: 50465a4911af7d00 RDX: 0000000000000000 RSI: ffffffff8d8f29fa RDI: ffff88801fba5ac0 RBP: ffffc9000ef37b98 R08: ffff8880b8924293 R09: 1ffff11017124852 R10: dffffc0000000000 R11: ffffed1017124853 R12: dffffc0000000000 R13: 1ffffd40002590a1 R14: ffffea00012c8518 R15: ffffea00012c8508 FS: 0000000000000000(0000) GS:ffff88812623e000(0063) knlGS:000000005671e440 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080000000 CR3: 00000000301ae000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: f8 clc 1: 09 f0 or %esi,%eax 3: 74 1d je 0x22 5: 89 f0 mov %esi,%eax 7: 83 f0 01 xor $0x1,%eax a: 09 f8 or %edi,%eax c: 0f 85 3c 02 00 00 jne 0x24e 12: 8b 44 24 20 mov 0x20(%rsp),%eax 16: 0f c8 bswap %eax 18: 89 44 24 20 mov %eax,0x20(%rsp) 1c: 31 c0 xor %eax,%eax 1e: 89 44 24 24 mov %eax,0x24(%rsp) 22: 8b 44 24 1c mov 0x1c(%rsp),%eax 26: 8b 4c 24 20 mov 0x20(%rsp),%ecx * 2a: 89 08 mov %ecx,(%rax) <-- trapping instruction 2c: e9 39 fb ff ff jmp 0xfffffb6a 31: 0f b6 4c 24 08 movzbl 0x8(%rsp),%ecx 36: 8b 5c 24 28 mov 0x28(%rsp),%ebx 3a: 89 cf mov %ecx,%edi 3c: c1 ef 05 shr $0x5,%edi 3f: 83 .byte 0x83 --- 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@googlegroups.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