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Sat, 16 May 2026 22:43:10 -0700 (PDT) Date: Sat, 16 May 2026 22:43:10 -0700 In-Reply-To: <6a062e5c.170a0220.196691.0007.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a09556e.a00a0220.300e5b.0006.GAE@google.com> Subject: Forwarded: Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_end_io (2) From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_end_io (2) Author: chao@kernel.org #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot On 5/14/26 20:19, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: aa54b1d27fe0 rxrpc: Also unshare DATA/RESPONSE packets whe.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14adabce580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f2e8ebfec4636d32 > dashboard link: https://syzkaller.appspot.com/bug?extid=4af46ee83100e99bce09 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1643c3ce580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12adabce580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/418e3ed628cf/disk-aa54b1d2.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/a35b53d0ab2f/vmlinux-aa54b1d2.xz > kernel image: https://storage.googleapis.com/syzbot-assets/03c3fa0081b4/bzImage-aa54b1d2.xz > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/13e397c7f935/mount_0.gz > fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=158fad06580000) > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/2f91edde40dc/mount_8.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+4af46ee83100e99bce09@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > kernel BUG at fs/f2fs/data.c:388! > Oops: invalid opcode: 0000 [#1] SMP KASAN PTI > CPU: 1 UID: 0 PID: 31 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 > RIP: 0010:f2fs_write_end_io+0x16df/0x1740 fs/f2fs/data.c:388 > Code: 20 3c 9b 8b e8 12 0a f7 fc 90 0f 0b e8 0a cc 93 fd 48 8b 3c 24 48 c7 c6 20 3c 9b 8b e8 fa 09 f7 fc 90 0f 0b e8 f2 cb 93 fd 90 <0f> 0b e8 ea cb 93 fd 48 8b 3c 24 48 c7 c6 20 3c 9b 8b e8 da 09 f7 > RSP: 0018:ffffc90000a5fb18 EFLAGS: 00010246 > RAX: ffffffff8430aade RBX: ffffea0000d91c40 RCX: ffff88801d6b0000 > RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 > RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100 > R10: dffffc0000000000 R11: fffffbfff1f11dff R12: 0000000036471000 > R13: ffffea0000d91c80 R14: 000000000000000b R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff888126276000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007eff6352cff8 CR3: 000000002caa2000 CR4: 00000000003526f0 > Call Trace: > > blk_update_request+0x57e/0xe60 block/blk-mq.c:1016 > blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1178 > blk_complete_reqs block/blk-mq.c:1253 [inline] > blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258 > handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622 > run_ksoftirqd+0x52/0x180 kernel/softirq.c:1076 > smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 > kthread+0x388/0x470 kernel/kthread.c:436 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:f2fs_write_end_io+0x16df/0x1740 fs/f2fs/data.c:388 > Code: 20 3c 9b 8b e8 12 0a f7 fc 90 0f 0b e8 0a cc 93 fd 48 8b 3c 24 48 c7 c6 20 3c 9b 8b e8 fa 09 f7 fc 90 0f 0b e8 f2 cb 93 fd 90 <0f> 0b e8 ea cb 93 fd 48 8b 3c 24 48 c7 c6 20 3c 9b 8b e8 da 09 f7 > RSP: 0018:ffffc90000a5fb18 EFLAGS: 00010246 > RAX: ffffffff8430aade RBX: ffffea0000d91c40 RCX: ffff88801d6b0000 > RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 > RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100 > R10: dffffc0000000000 R11: fffffbfff1f11dff R12: 0000000036471000 > R13: ffffea0000d91c80 R14: 000000000000000b R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff888126276000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007eff6352cff8 CR3: 000000002caa2000 CR4: 00000000003526f0 > > > --- > 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 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. > > 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