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006d021491bc7-679b1036444mr4716675eaf.21.1771712063916; Sat, 21 Feb 2026 14:14:23 -0800 (PST) Date: Sat, 21 Feb 2026 14:14:23 -0800 In-Reply-To: <69959446.050a0220.2eeac1.014d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699a2e3f.050a0220.340abe.0d2a.GAE@google.com> Subject: Re: [syzbot] [f2fs?] general protection fault in f2fs_in_warm_node_list From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: d79526b89571 Merge tag 'spi-fix-v7.0-merge-window' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16898f3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=abe4fa590468dbfb dashboard link: https://syzkaller.appspot.com/bug?extid=6e4cb1cac5efc96ea0ca 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=1230d722580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11638152580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/44c805790970/disk-d79526b8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1ce6fb543c09/vmlinux-d79526b8.xz kernel image: https://storage.googleapis.com/syzbot-assets/e59b179ab15c/bzImage-d79526b8.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/6c7449a54d18/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16e5255a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6e4cb1cac5efc96ea0ca@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 30 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [inline] RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330 Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 31 ab fd fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 14 ab fd fd 4d 3b 37 74 19 e8 4a RSP: 0018:ffffc90000a4f9a8 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0000c14dc0 RCX: ffff88801d2b9e40 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: ffffea0000c14dd8 R08: ffff88803746002b R09: 1ffff11006e8c005 R10: dffffc0000000000 R11: ffffed1006e8c006 R12: ffff88803471e798 R13: dffffc0000000000 R14: ffff888045f67750 R15: 0000000000000030 FS: 0000000000000000(0000) GS:ffff888126442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffda58b1c70 CR3: 000000003ab1a000 CR4: 00000000003526f0 Call Trace: f2fs_write_end_io+0x7ab/0xff0 fs/f2fs/data.c:400 blk_update_request+0x57e/0xe60 block/blk-mq.c:1016 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1178 blk_flush_complete_seq+0x687/0xce0 block/blk-flush.c:191 flush_end_io+0xc40/0xf30 block/blk-flush.c:251 __blk_mq_end_request+0x4a9/0x680 block/blk-mq.c:1168 blk_complete_reqs block/blk-mq.c:1253 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258 handle_softirqs+0x1de/0x6f0 kernel/softirq.c:622 run_ksoftirqd+0x52/0x180 kernel/softirq.c:1063 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 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:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [inline] RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330 Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 31 ab fd fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 14 ab fd fd 4d 3b 37 74 19 e8 4a RSP: 0018:ffffc90000a4f9a8 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0000c14dc0 RCX: ffff88801d2b9e40 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: ffffea0000c14dd8 R08: ffff88803746002b R09: 1ffff11006e8c005 R10: dffffc0000000000 R11: ffffed1006e8c006 R12: ffff88803471e798 R13: dffffc0000000000 R14: ffff888045f67750 R15: 0000000000000030 FS: 0000000000000000(0000) GS:ffff888126442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffda58b1c70 CR3: 000000003ab1a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4d 03 3c 24 add (%r12),%r15 6: 4c 89 f8 mov %r15,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 4c 89 ff mov %r15,%rdi 17: e8 31 ab fd fd call 0xfdfdab4d 1c: 4d 8b 3f mov (%r15),%r15 1f: 49 83 c7 30 add $0x30,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 14 ab fd fd call 0xfdfdab4d 39: 4d 3b 37 cmp (%r15),%r14 3c: 74 19 je 0x57 3e: e8 .byte 0xe8 3f: 4a rex.WX --- 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.