syzbot
WARNING in eventfs_create_events_dir
Status:
upstream: reported C repro on 2026/08/24 09:50
Subsystems:
fs
trace
Labels:
prio:low
[Documentation on labels]
Reported-by: syzbot+3ef80b4ed02226d04a06@syzkaller.appspotmail.com
Fix commit:
eventfs: Initialize ei->children and ei->list in init_ei()
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm 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-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-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 8d14h, last: 13h05m
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Last patch testing requests (1)
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Cause bisection attempts (1)
| Created |
Duration |
User |
Patch |
Repo |
Result |
| 2026/08/28 13:31 |
|
bisect
|
|
upstream |
running
|
Sample crash report:
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fae2ca35a9f
R13: 00007fae2ca35adb R14: 00007fae2ca5ccc0 R15: 0000000000000002
</TASK>
------------[ cut here ]------------
!list_empty(&ei->children)
WARNING: fs/tracefs/event_inode.c:128 at free_ei fs/tracefs/event_inode.c:128 [inline], CPU#0: syz-executor340/6037
WARNING: fs/tracefs/event_inode.c:128 at cleanup_ei fs/tracefs/event_inode.c:150 [inline], CPU#0: syz-executor340/6037
WARNING: fs/tracefs/event_inode.c:128 at cleanup_ei fs/tracefs/event_inode.c:145 [inline], CPU#0: syz-executor340/6037
WARNING: fs/tracefs/event_inode.c:128 at eventfs_create_events_dir+0xa3d/0xbe0 fs/tracefs/event_inode.c:838, CPU#0: syz-executor340/6037
Modules linked in:
CPU: 0 UID: 0 PID: 6037 Comm: syz-executor340 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
RIP: 0010:free_ei fs/tracefs/event_inode.c:128 [inline]
RIP: 0010:cleanup_ei fs/tracefs/event_inode.c:150 [inline]
RIP: 0010:cleanup_ei fs/tracefs/event_inode.c:145 [inline]
RIP: 0010:eventfs_create_events_dir+0xa3d/0xbe0 fs/tracefs/event_inode.c:838
Code: 00 e8 e7 82 fa 00 e9 ab fb ff ff e8 1d 4e e1 fd 48 8b 7c 24 10 be 03 00 00 00 e8 ce 82 fa 00 e9 c2 fd ff ff e8 04 4e e1 fd 90 <0f> 0b 90 e9 59 fe ff ff e8 e6 21 54 fe e9 4b f7 ff ff 48 89 44 24
RSP: 0018:ffffc90005867b88 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888045883028 RCX: 0000000000000000
RDX: ffff88802ecd2580 RSI: ffffffff8429b3cc RDI: ffffffff8e69c920
RBP: ffff888030052f10 R08: 00000000ffffffff R09: fffffbfff1dff612
R10: ffffffff8effb093 R11: 0000000000000001 R12: ffff888030052f50
R13: 0000000000000003 R14: ffff888030052f4c R15: ffff888030052f00
FS: 000055555739d400(0000) GS:ffff8880d5ba2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c8902f3204 CR3: 0000000022b49000 CR4: 0000000000352ef0
Call Trace:
<TASK>
create_event_toplevel_files+0x12d/0x1a0 kernel/trace/trace_events.c:4709
event_trace_add_tracer+0x72/0x260 kernel/trace/trace_events.c:4740
trace_array_create_dir+0x8e/0x210 kernel/trace/trace.c:8550
trace_array_create_systems+0x8b3/0xc30 kernel/trace/trace.c:8641
trace_array_create kernel/trace/trace.c:8668 [inline]
instance_mkdir+0xca/0x140 kernel/trace/trace.c:8683
tracefs_syscall_mkdir+0x10e/0x180 fs/tracefs/inode.c:121
vfs_mkdir+0x364/0x850 fs/namei.c:5410
filename_mkdirat+0x48b/0x5e0 fs/namei.c:5443
__do_sys_mkdir fs/namei.c:5470 [inline]
__se_sys_mkdir fs/namei.c:5467 [inline]
__x64_sys_mkdir+0x6b/0x90 fs/namei.c:5467
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae2c9d8ec7
Code: 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcc38a20c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fae2c9d8ec7
RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00007ffcc38a2160
RBP: 00007ffcc38a2160 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fae2ca35a9f
R13: 00007fae2ca35adb R14: 00007fae2ca5ccc0 R15: 0000000000000002
</TASK>
Struck through repros no longer work on HEAD.