syzbot


WARNING in kernfs_get (5)

Status: upstream: reported syz repro on 2024/05/08 11:07
Subsystems: kernfs
[Documentation on labels]
Reported-by: syzbot+2f44671e54488d20f0e6@syzkaller.appspotmail.com
First crash: 72d, last: 4d22h
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly kernfs report (Jul 2024) 0 (1) 2024/07/09 14:10
[syzbot] [kernfs?] WARNING in kernfs_get (5) 3 (8) 2024/05/16 14:52
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 WARNING in kernfs_get C done 14 1767d 1907d 1/1 fixed on 2019/12/05 23:59
upstream WARNING in kernfs_get (2) kernfs 2 1387d 1405d 0/27 auto-closed as invalid on 2021/01/25 03:55
linux-4.14 WARNING in kernfs_get C done 17 1791d 1911d 1/1 fixed on 2019/12/07 19:24
upstream WARNING in kernfs_get (4) kernfs syz error 3 523d 526d 0/27 auto-obsoleted due to no activity on 2023/06/07 19:32
upstream WARNING in kernfs_get C done 316 1806d 2135d 13/27 fixed on 2019/11/20 22:01
upstream WARNING in kernfs_get (3) kernfs 3 952d 956d 0/27 auto-closed as invalid on 2022/02/04 06:25
android-414 WARNING in kernfs_get syz 69 1770d 1922d 0/1 public: reported syz repro on 2019/04/10 15:44
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/05/29 02:18 19m retest repro linux-next report log
2024/05/16 14:28 21m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 OK log
2024/05/15 10:33 2h32m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 OK log
2024/05/14 23:23 1h04m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 report log

Sample crash report:
usb 2-1: Direct firmware load for ueagle-atm/eagleI.fw failed with error -2
usb 2-1: Falling back to sysfs fallback for: ueagle-atm/eagleI.fw
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5166 at fs/kernfs/dir.c:526 kernfs_get+0x71/0x90 fs/kernfs/dir.c:526
Modules linked in:
CPU: 0 PID: 5166 Comm: kworker/0:4 Not tainted 6.9.0-next-20240514-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: events request_firmware_work_func
RIP: 0010:kernfs_get+0x71/0x90 fs/kernfs/dir.c:526
Code: 23 e8 63 b0 5e ff 48 89 df be 04 00 00 00 e8 96 6c c4 ff f0 ff 03 eb 05 e8 4c b0 5e ff 5b 5d c3 cc cc cc cc e8 40 b0 5e ff 90 <0f> 0b 90 eb d7 89 d9 80 e1 07 80 c1 03 38 c1 7c b7 48 89 df e8 96
RSP: 0018:ffffc90003bdf6e0 EFLAGS: 00010293
RAX: ffffffff82379c40 RBX: ffff8880770dff00 RCX: ffff88802729da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff82379c14 R09: 1ffff1100ee1bfe0
R10: dffffc0000000000 R11: ffffed100ee1bfe1 R12: dffffc0000000000
R13: ffff88802a984008 R14: ffffffff8c4497f0 R15: ffff88802a984038
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55ba7ad988 CR3: 0000000024c16000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sysfs_get include/linux/sysfs.h:786 [inline]
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x4ba/0x8d0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x152/0x220 lib/kobject.c:426
 device_add+0x4e5/0xbf0 drivers/base/core.c:3659
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x307/0x9e0 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xcf5/0x12b0 drivers/base/firmware_loader/main.c:914
 request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1165
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 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 (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/14 15:44 linux-next 26dd54d03cd9 fdb4c10c .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2024/07/10 12:59 upstream 34afb82a3c67 e7213be3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2024/06/28 13:21 upstream 5bbd9b249880 b62c7d46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2024/06/20 20:25 upstream 2ccbdf43d5e7 dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kernfs_get
2024/05/04 10:57 upstream 3d25a941ea50 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2024/06/26 19:16 upstream 55027e689933 880c1ca1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in kernfs_get
2024/06/25 17:13 upstream 55027e689933 da0bd5ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in kernfs_get
2024/06/30 13:38 upstream 8282d5af7be8 757f06b1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kernfs_get
2024/06/27 20:38 upstream 66e55ff12e73 6ef39602 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kernfs_get
2024/06/30 13:43 upstream 8282d5af7be8 757f06b1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in kernfs_get
* Struck through repros no longer work on HEAD.