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Message-ID: <61a3acc4-d541-41a4-b675-67b20f125117@kernel.org> Date: Mon, 13 Oct 2025 20:41:39 +0800 From: Chao Yu <chao@...nel.org> To: "Bai, Shuangpeng" <SJB7183@....EDU>, "jaegeuk@...nel.org" <jaegeuk@...nel.org> Cc: chao@...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 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, > > > 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 >
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