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WARNING in nilfs_btree_propagate (2)

Status: upstream: reported C repro on 2024/10/15 17:29
Subsystems: nilfs
[Documentation on labels]
Reported-by: syzbot+b2b14916b77acf8626d7@syzkaller.appspotmail.com
Fix commit: ca76bb226bf4 nilfs2: do not force clear folio if buffer is referenced
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 167d, last: 121d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: the issue occurs on the latest tested release (bisect log)
  
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH 0/2] nilfs2: protect busy buffer heads from being force-cleared 3 (3) 2025/01/07 20:00
[syzbot] [nilfs?] WARNING in nilfs_btree_propagate (2) 1 (3) 2024/12/11 12:43
[syzbot] Monthly nilfs report (Nov 2024) 0 (1) 2024/11/28 08:47
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in nilfs_btree_propagate nilfs 4 668d 755d 0/28 auto-obsoleted due to no activity on 2023/09/07 03:17
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2025/01/05 21:53 1h33m retest repro upstream error
2024/12/11 11:30 25m konishi.ryusuke@gmail.com patch upstream OK log
2024/11/27 03:05 13m retest repro upstream report log
2024/10/26 17:37 15m retest repro upstream report log

Sample crash report:
WARNING: CPU: 0 PID: 5245 at fs/nilfs2/btree.c:2089 nilfs_btree_propagate+0xc79/0xdf0 fs/nilfs2/btree.c:2089
Modules linked in:
CPU: 0 UID: 0 PID: 5245 Comm: segctord Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:nilfs_btree_propagate+0xc79/0xdf0 fs/nilfs2/btree.c:2089
Code: 48 8b 44 24 08 49 8d 74 05 58 e8 12 67 ff ff 48 8b 6c 24 10 43 80 3c 27 00 0f 85 16 fe ff ff e9 19 fe ff ff e8 78 1d 20 fe 90 <0f> 0b 90 e9 ea f3 ff ff e8 6a 1d 20 fe 48 8b 1c 24 48 81 c3 d0 00
RSP: 0018:ffffc90003d873a0 EFLAGS: 00010293
RAX: ffffffff8374c988 RBX: 0000000000000000 RCX: ffff888011dada00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8c47aec8 R08: ffffffff8374bd6c R09: 1ffff1100ec15f96
R10: dffffc0000000000 R11: ffffed100ec15f97 R12: dffffc0000000000
R13: 1ffff1100ec15f9f R14: 1ffff1100ec15f96 R15: ffff8880760afcb0
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8737b0dd58 CR3: 0000000079068000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nilfs_bmap_propagate+0x75/0x120 fs/nilfs2/bmap.c:345
 nilfs_collect_file_data+0x4d/0xd0 fs/nilfs2/segment.c:587
 nilfs_segctor_apply_buffers+0x184/0x340 fs/nilfs2/segment.c:1006
 nilfs_segctor_scan_file+0x28c/0xa50 fs/nilfs2/segment.c:1045
 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1216 [inline]
 nilfs_segctor_collect fs/nilfs2/segment.c:1540 [inline]
 nilfs_segctor_do_construct+0x1c28/0x6b90 fs/nilfs2/segment.c:2115
 nilfs_segctor_construct+0x181/0x6b0 fs/nilfs2/segment.c:2479
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2587 [inline]
 nilfs_segctor_thread+0x69e/0xe80 fs/nilfs2/segment.c:2701
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/11 17:18 upstream 1d227fcc7222 cd942402 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in nilfs_btree_propagate
2024/11/13 02:59 upstream 3022e9d00ebe 62026c85 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in nilfs_btree_propagate
* Struck through repros no longer work on HEAD.