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Message-ID: <67aa72bf.050a0220.110943.0035.GAE@google.com> Date: Mon, 10 Feb 2025 13:42:23 -0800 From: syzbot <syzbot+15669ec8c35ddf6c3d43@...kaller.appspotmail.com> To: chao@...nel.org, jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [f2fs?] kernel BUG in new_curseg (2) syzbot has found a reproducer for the following issue on: HEAD commit: a64dcfb451e2 Linux 6.14-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17297b18580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f246b548ed0635a dashboard link: https://syzkaller.appspot.com/bug?extid=15669ec8c35ddf6c3d43 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103943f8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12da1bdf980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-a64dcfb4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6a816640d31b/vmlinux-a64dcfb4.xz kernel image: https://storage.googleapis.com/syzbot-assets/b5cb42ffa4f6/bzImage-a64dcfb4.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/caba9b9b8f24/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14da1bdf980000) mounted in repro #2: https://storage.googleapis.com/syzbot-assets/270c3c4c1558/mount_6.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=121672a4580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+15669ec8c35ddf6c3d43@...kaller.appspotmail.com F2FS-fs (loop0): Found nat_bits in checkpoint F2FS-fs (loop0): Start checkpoint disabled! F2FS-fs (loop0): Mounted with checkpoint version = 48b305e6 ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2809! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5304 Comm: syz-executor274 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:get_new_segment fs/f2fs/segment.c:2809 [inline] RIP: 0010:new_curseg+0x1f52/0x1f70 fs/f2fs/segment.c:2939 Code: fb fd e9 1a fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c fa ff ff 48 89 df e8 59 4e fb fd e9 3f fa ff ff e8 5f b5 94 fd 90 <0f> 0b e8 57 b5 94 fd 90 0f 0b e8 4f b5 94 fd 90 0f 0b e8 47 b5 94 RSP: 0018:ffffc9000d0af4a8 EFLAGS: 00010293 RAX: ffffffff842a9a41 RBX: 0000000000000018 RCX: ffff88801ede4880 RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000018 RBP: dffffc0000000000 R08: ffffffff842a8875 R09: fffff52001a15e84 R10: dffffc0000000000 R11: fffff52001a15e84 R12: 0000000000000018 R13: ffff888043de5101 R14: 0000000000000018 R15: ffff888038298f58 FS: 000055556f014380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000042a82000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3273 f2fs_allocate_new_section fs/f2fs/segment.c:3287 [inline] f2fs_allocate_pinning_section+0xfa/0x4e0 fs/f2fs/segment.c:3301 f2fs_expand_inode_data+0x696/0xca0 fs/f2fs/file.c:1849 f2fs_fallocate+0x537/0xa10 fs/f2fs/file.c:1959 vfs_fallocate+0x623/0x7a0 fs/open.c:338 do_vfs_ioctl+0x258c/0x2e40 fs/ioctl.c:885 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffbafdefd99 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffecbc98b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000400000000080 RCX: 00007ffbafdefd99 RDX: 00004000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 0030656c69662f2e R08: 000055556f0154c0 R09: 000055556f0154c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00004000000000c0 R13: 00004000000000e0 R14: 00004000000000c2 R15: 00007ffbafe3903b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:get_new_segment fs/f2fs/segment.c:2809 [inline] RIP: 0010:new_curseg+0x1f52/0x1f70 fs/f2fs/segment.c:2939 Code: fb fd e9 1a fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c fa ff ff 48 89 df e8 59 4e fb fd e9 3f fa ff ff e8 5f b5 94 fd 90 <0f> 0b e8 57 b5 94 fd 90 0f 0b e8 4f b5 94 fd 90 0f 0b e8 47 b5 94 RSP: 0018:ffffc9000d0af4a8 EFLAGS: 00010293 RAX: ffffffff842a9a41 RBX: 0000000000000018 RCX: ffff88801ede4880 RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000018 RBP: dffffc0000000000 R08: ffffffff842a8875 R09: fffff52001a15e84 R10: dffffc0000000000 R11: fffff52001a15e84 R12: 0000000000000018 R13: ffff888043de5101 R14: 0000000000000018 R15: ffff888038298f58 FS: 000055556f014380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000042a82000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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