syzbot


WARNING in stashed_dentry_prune (2)

Status: upstream: reported C repro on 2024/04/17 09:47
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+e25ef173c0758ea764de@syzkaller.appspotmail.com
Fix commit: 9d9539db8638 pidfs: remove config option
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 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-net-next-test-gce ci2-upstream-usb], missing on: [ci-upstream-bpf-kasan-gce]
First crash: 35d, last: 22d
Cause bisection: introduced by (bisect log) :
commit 2558e3b23112adb82a558bab616890a790a38bc6
Author: Christian Brauner <brauner@kernel.org>
Date: Wed Feb 21 08:59:51 2024 +0000

  libfs: add stashed_dentry_prune()

Crash: WARNING in stashed_dentry_prune (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [fs?] WARNING in stashed_dentry_prune (2) 1 (3) 2024/05/10 11:34
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in stashed_dentry_prune fs C done 20 67d 66d 26/26 fixed on 2024/04/11 08:41

Sample crash report:
RDX: 0000000000000002 RSI: 00007ffd10172950 RDI: 00000000ffffff9c
RBP: 00007ffd10172950 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5067 at fs/libfs.c:2117 stashed_dentry_prune+0x97/0xa0 fs/libfs.c:2117
Modules linked in:
CPU: 0 PID: 5067 Comm: syz-executor252 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:stashed_dentry_prune+0x97/0xa0 fs/libfs.c:2117
Code: 00 00 e8 ac c1 e2 ff 31 c9 4c 89 f0 f0 49 0f b1 0f eb 05 e8 7b 77 7f ff 5b 41 5c 41 5e 41 5f c3 cc cc cc cc e8 6a 77 7f ff 90 <0f> 0b 90 eb e9 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000394f4c8 EFLAGS: 00010293
RAX: ffffffff82157906 RBX: ffff888075d4b588 RCX: ffff8880221c1e00
RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffff888075d4b490
RBP: 0000000000000001 R08: ffffffff820fa354 R09: 1ffff1100eba96a5
R10: dffffc0000000000 R11: ffffffff82157870 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888075d4b490 R15: 0000000000000000
FS:  000055555a374380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c10b02c00 CR3: 0000000011176000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __dentry_kill+0xa9/0x630 fs/dcache.c:594
 dput+0x19f/0x2b0 fs/dcache.c:845
 prepare_anon_dentry fs/libfs.c:2018 [inline]
 path_from_stashed+0x695/0xb00 fs/libfs.c:2094
 proc_ns_get_link+0xf9/0x230 fs/proc/namespaces.c:61
 pick_link+0x631/0xd50
 step_into+0xca9/0x1080 fs/namei.c:1875
 open_last_lookups fs/namei.c:3590 [inline]
 path_openat+0x18b0/0x3240 fs/namei.c:3797
 do_filp_open+0x235/0x490 fs/namei.c:3827
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1433
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f7c10aceda1
Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d ca 92 07 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25
RSP: 002b:00007ffd101728a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7c10aceda1
RDX: 0000000000000002 RSI: 00007ffd10172950 RDI: 00000000ffffff9c
RBP: 00007ffd10172950 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Crashes (54):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/13 09:57 bpf 443574b03387 c8349e48 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/26 03:56 bpf 443574b03387 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/25 16:29 bpf 443574b03387 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/25 15:12 bpf 443574b03387 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/25 02:42 bpf 443574b03387 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/24 08:08 bpf 443574b03387 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/24 00:28 bpf 443574b03387 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/23 20:07 bpf 443574b03387 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/23 06:28 bpf 443574b03387 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/22 14:18 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/22 06:31 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/21 14:23 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/21 06:10 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/21 02:35 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/21 02:31 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 23:48 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 21:30 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 20:27 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 20:19 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 17:02 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 17:02 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 11:36 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 08:55 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 04:28 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 03:26 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/20 03:00 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 20:41 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 18:05 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 16:12 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 15:14 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 08:03 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/19 05:37 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/18 21:48 bpf 443574b03387 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/18 18:52 net f99c5f563c17 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/18 03:05 bpf 443574b03387 bd38b692 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/18 01:22 net f99c5f563c17 bd38b692 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/17 14:12 net f99c5f563c17 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/17 13:08 bpf 443574b03387 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/16 18:34 net f99c5f563c17 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/16 16:20 net f99c5f563c17 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/16 08:07 net f99c5f563c17 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/16 01:03 bpf 443574b03387 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/15 23:04 bpf 443574b03387 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/15 23:04 bpf 443574b03387 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/14 12:13 net f99c5f563c17 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/14 06:49 net f99c5f563c17 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/14 02:52 net f99c5f563c17 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/14 02:47 net f99c5f563c17 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/13 20:19 net f99c5f563c17 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in stashed_dentry_prune
2024/04/13 14:44 bpf 443574b03387 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/13 12:33 bpf 443574b03387 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/13 12:26 bpf 443574b03387 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
2024/04/13 09:40 bpf 443574b03387 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in stashed_dentry_prune
* Struck through repros no longer work on HEAD.