Hello, syzbot found the following issue on:
HEAD commit: 2961f841b025 Merge tag 'turbostat-2026.02.14' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12c5db3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=65722f41f7edc17e 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=17ac695a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-2961f841.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/19ffd1a88c42/vmlinux-2961f841.xz kernel image: https://storage.googleapis.com/syzbot-assets/621dc0fadd96/bzImage-2961f841.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7ce23d543372/mount_5.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=110fbeef980000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 1041 Comm: kworker/u4:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: loop0 loop_workfn 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 61 3b f9 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 44 3b f9 fd 4d 3b 37 74 19 e8 7a RSP: 0018:ffffc90005347488 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0001521080 RCX: ffff88803683c900 RDX: 0000000000000000 RSI: ffffea0001521080 RDI: ffff8880546fc000 RBP: ffffea0001521098 R08: ffffffff901194b7 R09: 1ffffffff2023296 R10: dffffc0000000000 R11: fffffbfff2023297 R12: ffff888023ebe638 R13: dffffc0000000000 R14: ffff8880474d9490 R15: 0000000000000030 FS: 0000000000000000(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbdbfabe000 CR3: 0000000056bbf000 CR4: 0000000000352ef0 Call Trace: <TASK> 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 lo_rw_aio_complete drivers/block/loop.c:337 [inline] lo_rw_aio+0xcde/0xf00 drivers/block/loop.c:410 do_req_filebacked drivers/block/loop.c:434 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0x61d/0x11a0 drivers/block/loop.c:1961 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 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 </TASK> 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 61 3b f9 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 44 3b f9 fd 4d 3b 37 74 19 e8 7a RSP: 0018:ffffc90005347488 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0001521080 RCX: ffff88803683c900 RDX: 0000000000000000 RSI: ffffea0001521080 RDI: ffff8880546fc000 RBP: ffffea0001521098 R08: ffffffff901194b7 R09: 1ffffffff2023296 R10: dffffc0000000000 R11: fffffbfff2023297 R12: ffff888023ebe638 R13: dffffc0000000000 R14: ffff8880474d9490 R15: 0000000000000030 FS: 0000000000000000(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbdbf9d3000 CR3: 0000000050969000 CR4: 0000000000352ef0 ---------------- 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 61 3b f9 fd call 0xfdf93b7d 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 44 3b f9 fd call 0xfdf93b7d 39: 4d 3b 37 cmp (%r15),%r14 3c: 74 19 je 0x57 3e: e8 .byte 0xe8 3f: 7a .byte 0x7a --- 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 [email protected]. 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 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
