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Message-ID: <6E931354-7EF6-45B3-99A9-6E632FE98D03@psu.edu> Date: Mon, 13 Oct 2025 17:56:26 +0000 From: "Bai, Shuangpeng" <SJB7183@....EDU> To: Chao Yu <chao@...nel.org> CC: "jaegeuk@...nel.org" <jaegeuk@...nel.org>, "linux-f2fs-devel@...ts.sourceforge.net" <linux-f2fs-devel@...ts.sourceforge.net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "syzkaller@...glegroups.com" <syzkaller@...glegroups.com> Subject: Re: [BUG] f2fs: divide error in f2fs_all_cluster_page_ready on v6.17 > On Oct 13, 2025, at 08:41, Chao Yu <chao@...nel.org> wrote: > > On 10/13/25 07:49, Bai, Shuangpeng wrote: >> Hi Kernel Maintainers, >> >> Our tool found a new kernel bug "divide error in f2fs_all_cluster_page_ready". Please see the details below. >> >> Kernel commit: 6.17 >> Kernel config: attachment >> Reproducer: attachment >> >> The reproducer triggers the crash reliably in ~500 seconds on a QEMU x86_64 VM. >> >> I’m happy to test debug patches or provide additional information. > > Hi Bai, > > Thanks for your report! > > Could you please share scripts and images for this issue? as I can not reproduce > w/ repro.c. > Thanks for your reply! I used clang-15 to compile the kernel v6.17 with the .config in the attachment. The image I used is bullseye.img (https://drive.google.com/file/d/1krL9Mc-s07aA6m-0VjuuO767StacvZQV/view?usp=share_link). The image is created by https://raw.githubusercontent.com/google/syzkaller/master/tools/create-image.sh. I will also send the boot script as attachments. This bug takes about 500 seconds to trigger the bug in our testing environment. Please let me know if anything needed. Thanks! > Thanks, > >> >> >> Oops: divide error: 0000 [#1] SMP KASAN PTI >> CPU: 0 UID: 0 PID: 11441 Comm: syz.0.46 Not tainted 6.17.0 #1 PREEMPT(full) >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 >> RIP: 0010:f2fs_all_cluster_page_ready+0x106/0x550 fs/f2fs/compress.c:857 >> Code: 00 8b 4d 00 48 89 d8 48 c1 e8 20 74 19 48 89 d8 31 d2 48 f7 f1 48 89 d5 eb 14 48 89 5c 24 10 e8 40 a4 6d fd eb 2d 89 d8 31 d2 <f7> f1 89 d5 31 ff 48 89 ee e8 0c a9 6d fd 48 85 ed 74 0c e8 22 a4 >> RSP: 0018:ffffc90006616e60 EFLAGS: 00010246 >> RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 >> RBP: ffffc90006617270 R08: ffffffff84552d26 R09: 0000000000000000 >> R10: ffff888155ad2000 R11: ffffffff81d2aa26 R12: 0000000000000001 >> R13: dffffc0000000000 R14: 0000000000000010 R15: ffffc90006617260 >> FS: 00007f8bac5b5640(0000) GS:ffff888220f02000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000056508a326000 CR3: 0000000117bec000 CR4: 00000000000006f0 >> Call Trace: >> <TASK> >> f2fs_write_cache_pages fs/f2fs/data.c:3078 [inline] >> __f2fs_write_data_pages fs/f2fs/data.c:3290 [inline] >> f2fs_write_data_pages+0x1c19/0x3600 fs/f2fs/data.c:3317 >> do_writepages+0x38e/0x640 mm/page-writeback.c:2634 >> filemap_fdatawrite_wbc mm/filemap.c:386 [inline] >> __filemap_fdatawrite_range mm/filemap.c:419 [inline] >> file_write_and_wait_range+0x2ba/0x3e0 mm/filemap.c:794 >> f2fs_do_sync_file+0x6e6/0x1b00 fs/f2fs/file.c:294 >> generic_write_sync include/linux/fs.h:3043 [inline] >> f2fs_file_write_iter+0x76e/0x2700 fs/f2fs/file.c:5259 >> new_sync_write fs/read_write.c:593 [inline] >> vfs_write+0x7e9/0xe00 fs/read_write.c:686 >> ksys_write+0x19d/0x2d0 fs/read_write.c:738 >> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >> do_syscall_64+0xf7/0x470 arch/x86/entry/syscall_64.c:94 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f8bab7ae49d >> Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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:00007f8bac5b4f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 >> RAX: ffffffffffffffda RBX: 00007f8baba26180 RCX: 00007f8bab7ae49d >> RDX: 000000000000ffbd RSI: 0000200000000240 RDI: 0000000000000007 >> RBP: 00007f8bab848268 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> R13: 00007f8baba26218 R14: 00007f8baba26180 R15: 00007f8bac595000 >> </TASK> >> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:f2fs_all_cluster_page_ready+0x106/0x550 fs/f2fs/compress.c:857 >> Code: 00 8b 4d 00 48 89 d8 48 c1 e8 20 74 19 48 89 d8 31 d2 48 f7 f1 48 89 d5 eb 14 48 89 5c 24 10 e8 40 a4 6d fd eb 2d 89 d8 31 d2 <f7> f1 89 d5 31 ff 48 89 ee e8 0c a9 6d fd 48 85 ed 74 0c e8 22 a4 >> RSP: 0018:ffffc90006616e60 EFLAGS: 00010246 >> RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 >> RBP: ffffc90006617270 R08: ffffffff84552d26 R09: 0000000000000000 >> R10: ffff888155ad2000 R11: ffffffff81d2aa26 R12: 0000000000000001 >> R13: dffffc0000000000 R14: 0000000000000010 R15: ffffc90006617260 >> FS: 00007f8bac5b5640(0000) GS:ffff888220f02000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000056508a326000 CR3: 0000000117bec000 CR4: 00000000000006f0 >> ---------------- >> Code disassembly (best guess): >> 0: 00 8b 4d 00 48 89 add %cl,-0x76b7ffb3(%rbx) >> 6: d8 48 c1 fmuls -0x3f(%rax) >> 9: e8 20 74 19 48 call 0x4819742e >> e: 89 d8 mov %ebx,%eax >> 10: 31 d2 xor %edx,%edx >> 12: 48 f7 f1 div %rcx >> 15: 48 89 d5 mov %rdx,%rbp >> 18: eb 14 jmp 0x2e >> 1a: 48 89 5c 24 10 mov %rbx,0x10(%rsp) >> 1f: e8 40 a4 6d fd call 0xfd6da464 >> 24: eb 2d jmp 0x53 >> 26: 89 d8 mov %ebx,%eax >> 28: 31 d2 xor %edx,%edx >> * 2a: f7 f1 div %ecx <-- trapping instruction >> 2c: 89 d5 mov %edx,%ebp >> 2e: 31 ff xor %edi,%edi >> 30: 48 89 ee mov %rbp,%rsi >> 33: e8 0c a9 6d fd call 0xfd6da944 >> 38: 48 85 ed test %rbp,%rbp >> 3b: 74 0c je 0x49 >> 3d: e8 .byte 0xe8 >> 3e: 22 .byte 0x22 >> 3f: a4 movsb %ds:(%rsi),%es:(%rdi) >> >> Best, >> Shuangpeng >> > Content of type "text/html" skipped Download attachment "boot.sh" of type "application/octet-stream" (518 bytes)
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