ci starts bisection 2023-04-13 11:40:07.619625791 +0000 UTC m=+60311.989519650
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: c1aace60cb30d871961987146a6f4a40eaa10c87714926c41a920b134cb7d37e
run #0: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #1: crashed: KASAN: use-after-free Read in kernfs_add_one
run #2: crashed: KASAN: use-after-free Read in kernfs_get
run #3: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #4: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #5: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
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 de4664485abbc0529b1eec44d0061bbfe58a28fb
testing commit de4664485abbc0529b1eec44d0061bbfe58a28fb gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: e95c9825b144e6ae453771e00a9e9b7190be9a6d562bcfa21a533361c24d6d3b
run #0: crashed: KASAN: slab-use-after-free Read in kernfs_add_one
run #1: crashed: KASAN: slab-use-after-free Read in kernfs_next_descendant_post
run #2: crashed: WARNING in dpm_sysfs_add
run #3: crashed: KASAN: slab-use-after-free Read in kernfs_add_one
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
revisions tested: 2, total time: 26m23.035608792s (build: 14m8.326256853s, test: 11m2.508247383s)
the crash still happens on HEAD
commit msg: Merge tag 'for-linus-2023041201' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
crash: WARNING in firmware_fallback_sysfs
WARNING: CPU: 1 PID: 5057 at fs/sysfs/group.c:278 sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:278
Modules linked in:
CPU: 1 PID: 5057 Comm: kworker/1:4 Not tainted 6.3.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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 64 1e 89 e8 fe 57 5b ff <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 e8 7e b4 d0 ff e9 26 ff ff ff 48
RSP: 0018:ffffc90003c4fa18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff897ddaa0 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff890bfa80 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8fb9ca87
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888017b3e008
R13: 1ffff92000789f4c R14: 0000000000000000 R15: ffff888023b9b0a8
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa44e25a110 CR3: 0000000027113000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 device_del+0x191/0xa90 drivers/base/core.c:3752
 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+0x972/0xfd0 drivers/base/firmware_loader/main.c:856
 request_firmware_work_func+0xd7/0x230 drivers/base/firmware_loader/main.c:1105
 process_one_work+0x865/0x13f0 kernel/workqueue.c:2390
 worker_thread+0x598/0xec0 kernel/workqueue.c:2537
 kthread+0x294/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>