ci starts bisection 2023-05-16 00:34:59.59334443 +0000 UTC m=+13242.290621935
bisecting fixing commit since 55be6084c8e0e0ada9278c2ab60b7a584378efda
building syzkaller on b31320fc8f3519e40494f64ebf77c13d16284bfd
ensuring issue is reproducible on original commit 55be6084c8e0e0ada9278c2ab60b7a584378efda

testing commit 55be6084c8e0e0ada9278c2ab60b7a584378efda gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 60d139d62bab8856c55eb9e14b8fc86c382eb954ac2e99daa977045059e37cf8
run #0: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #1: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #2: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #3: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #4: crashed: WARNING in firmware_fallback_sysfs
run #5: crashed: WARNING in firmware_fallback_sysfs
run #6: crashed: WARNING in firmware_fallback_sysfs
run #7: crashed: WARNING in firmware_fallback_sysfs
run #8: crashed: WARNING in firmware_fallback_sysfs
run #9: crashed: WARNING in firmware_fallback_sysfs
run #10: crashed: WARNING in firmware_fallback_sysfs
run #11: crashed: WARNING in firmware_fallback_sysfs
run #12: crashed: WARNING in firmware_fallback_sysfs
run #13: crashed: WARNING in firmware_fallback_sysfs
run #14: crashed: WARNING in firmware_fallback_sysfs
run #15: crashed: WARNING in firmware_fallback_sysfs
run #16: crashed: WARNING in firmware_fallback_sysfs
run #17: crashed: WARNING in firmware_fallback_sysfs
run #18: crashed: WARNING in firmware_fallback_sysfs
run #19: crashed: WARNING in firmware_fallback_sysfs
testing current HEAD f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6
testing commit f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: c8074434cacf4fa782ed09ad48ae965f3141b9bbab19ca34a9f99e3775af2179
all runs: crashed: WARNING in firmware_fallback_sysfs
crash still not fixed/happens on the oldest tested release
revisions tested: 2, total time: 35m11.977648784s (build: 20m55.371911446s, test: 12m56.122928504s)
crash still not fixed on HEAD or HEAD had kernel test errors
commit msg: Linux 6.4-rc2
crash: WARNING in firmware_fallback_sysfs
WARNING: CPU: 1 PID: 4962 at fs/sysfs/group.c:278 sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:278
Modules linked in:
CPU: 1 PID: 4962 Comm: kworker/1:4 Not tainted 6.4.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events request_firmware_work_func
RIP: 0010:sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:278
Code: 48 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 3e 48 8b 33 48 c7 c7 80 b0 1e 89 e8 de fb 58 ff <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 e8 ce 58 d0 ff e9 26 ff ff ff 48
RSP: 0018:ffffc900039afa18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff897e4960 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff89665980 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffc900039af81f
R10: fffff52000735f03 R11: 0000000000000000 R12: ffff8880162ef008
R13: 1ffff92000735f4c R14: ffff8880162ef008 R15: ffff8880266bd000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09893f8110 CR3: 000000000af6b000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 device_del+0x191/0x900 drivers/base/core.c:3789
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:120 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
 firmware_fallback_sysfs+0x614/0x980 drivers/base/firmware_loader/fallback.c:234
 _request_firmware+0xbf7/0x11a0 drivers/base/firmware_loader/main.c:909
 request_firmware_work_func+0xd7/0x230 drivers/base/firmware_loader/main.c:1160
 process_one_work+0x86e/0x1410 kernel/workqueue.c:2405
 worker_thread+0x5ab/0xef0 kernel/workqueue.c:2552
 kthread+0x2e6/0x3c0 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>