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Date: Fri, 04 Sep 2026 16:20:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9b5243.b5d4176b.238c3e.0008.GAE@google.com> Subject: [moderation/CI] Re: f2fs: enable buffered RWF_DONTCACHE From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v4] f2fs: enable buffered RWF_DONTCACHE https://lore.kernel.org/all/cover.1788438786.git.qiwenjie@xiaomi.com * [PATCH v4 1/2] f2fs: complete dropbehind write bios in task context * [PATCH v4 2/2] f2fs: enable buffered RWF_DONTCACHE and found the following issue: general protection fault in f2fs_write_begin Full report is available here: https://ci.syzbot.org/series/cbb9ded8-1388-4a7b-bfa7-44082b04025b *** general protection fault in f2fs_write_begin tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm= .git base: e3fc12b08aadde9cec7b3799ac0e0c9a1aa245c4 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp= 1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/e5903709-6ea2-4b1e-9dfc-f073e36367f= 7/config syz repro: https://ci.syzbot.org/findings/d05a5d64-e9a3-4714-9b41-43042eaaa= 82c/syz_repro loop0: detected capacity change from 0 to 40427 F2FS-fs (loop0): invalid crc value F2FS-fs (loop0): f2fs_recover_fsync_data: recovery fsync data, check_only: = 0 F2FS-fs (loop0): Mounted with checkpoint version =3D 48b305e5 Oops: general protection fault, probably for non-canonical address 0xdffffc= 0000000004: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 1 UID: 0 PID: 5791 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:f2fs_write_begin+0x181/0x28e0 fs/f2fs/data.c:3893 Code: e7 e8 23 21 d4 fd 49 8b 04 24 48 89 44 24 40 41 c6 45 2c 04 c7 84 24 = a0 02 00 00 00 00 00 00 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 8= 4 c0 0f 85 e9 23 00 00 41 be 80 00 00 00 44 23 33 RSP: 0018:ffffc900037af7a0 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000020 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffff8881b465c918 RDI: 0000000000000000 RBP: ffffc900037afad0 R08: ffffc900037afb80 R09: ffffc900037afba0 R10: dffffc0000000000 R11: ffffffff8463a450 R12: ffff88816b91e678 R13: fffff520006f5f1c R14: dffffc0000000000 R15: ffff8881b465c918 FS: 00007f65b5e096c0(0000) GS:ffff8882a8cd9000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f65b4e70050 CR3: 000000016a860000 CR4: 00000000000006f0 Call Trace: page_symlink+0x27a/0x440 fs/namei.c:6556 f2fs_symlink+0x5fc/0x970 fs/f2fs/namei.c:714 vfs_symlink+0x18b/0x330 fs/namei.c:5794 filename_symlinkat+0x1cd/0x410 fs/namei.c:5819 __do_sys_symlinkat fs/namei.c:5839 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5834 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f65b4f9e159 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f65b5e09028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f65b5225fa0 RCX: 00007f65b4f9e159 RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700 RBP: 00007f65b5035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f65b5226038 R14: 00007f65b5225fa0 R15: 00007fffb6ecc0c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_write_begin+0x181/0x28e0 fs/f2fs/data.c:3893 Code: e7 e8 23 21 d4 fd 49 8b 04 24 48 89 44 24 40 41 c6 45 2c 04 c7 84 24 = a0 02 00 00 00 00 00 00 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 8= 4 c0 0f 85 e9 23 00 00 41 be 80 00 00 00 44 23 33 RSP: 0018:ffffc900037af7a0 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000020 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffff8881b465c918 RDI: 0000000000000000 RBP: ffffc900037afad0 R08: ffffc900037afb80 R09: ffffc900037afba0 R10: dffffc0000000000 R11: ffffffff8463a450 R12: ffff88816b91e678 R13: fffff520006f5f1c R14: dffffc0000000000 R15: ffff8881b465c918 FS: 00007f65b5e096c0(0000) GS:ffff8882a8cd9000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f65b4feb840 CR3: 000000016a860000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 23 21 d4 fd call 0xfdd42128 5: 49 8b 04 24 mov (%r12),%rax 9: 48 89 44 24 40 mov %rax,0x40(%rsp) e: 41 c6 45 2c 04 movb $0x4,0x2c(%r13) 13: c7 84 24 a0 02 00 00 movl $0x0,0x2a0(%rsp) 1a: 00 00 00 00 1e: 48 83 c3 20 add $0x20,%rbx 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruct= ion 2e: 84 c0 test %al,%al 30: 0f 85 e9 23 00 00 jne 0x241f 36: 41 be 80 00 00 00 mov $0x80,%r14d 3c: 44 23 33 and (%rbx),%r14d *** 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@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported. The email will later be sent to: [axboe@kernel.dk baohua@kernel.org chao@kernel.org hch@lst.de jack@suse.cz = jaegeuk@kernel.org linux-block@vger.kernel.org linux-f2fs-devel@lists.sourc= eforge.net linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org linux= -mm@kvack.org qiwenjie@xiaomi.com qwjhust@gmail.com tz2294@columbia.edu] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid