ci starts bisection 2023-01-31 17:45:36.778525892 +0000 UTC m=+772450.724587986
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: bc5ec558c8be2522c70136c7489abfea27ed34aa35038b353a48b53f55afd0c3
run #0: crashed: KASAN: use-after-free Read in kernfs_get
run #1: crashed: KASAN: use-after-free Read in kernfs_add_one
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: KASAN: use-after-free Read in kernfs_get
run #5: crashed: KASAN: use-after-free Read in kernfs_get
run #6: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #7: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #8: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
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 9f266ccaa2f5228bfe67ad58a94ca4e0109b954a
testing commit 9f266ccaa2f5228bfe67ad58a94ca4e0109b954a gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 2986d173b61b611ffb017c921b4e217d14ddad495e6340121b6dbc57bbdae041
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_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
revisions tested: 2, total time: 22m14.159733955s (build: 13m18.774107257s, test: 8m16.399278026s)
the crash still happens on HEAD
commit msg: Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
crash: WARNING in firmware_fallback_sysfs
------------[ cut here ]------------
sysfs group 'power' not found for kobject 'ueagle-atm!eagleI.fw'
WARNING: CPU: 0 PID: 5054 at fs/sysfs/group.c:278 sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:278
Modules linked in:
CPU: 0 PID: 5054 Comm: kworker/0:5 Not tainted 6.2.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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 c0 63 1e 89 e8 99 19 ae 06 <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 e8 6e 0f d1 ff e9 26 ff ff ff 48
RSP: 0018:ffffc900038ffa10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff897e1be0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200071ff34
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880b9c2794b
R10: ffffed1017384f29 R11: 0000000000000001 R12: ffff88801c5c7008
R13: ffff888075a8d0a8 R14: ffff88801c5c7088 R15: ffff88801bfa6a00
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f90391ad0b0 CR3: 000000002500b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 device_del+0x1ee/0xb80 drivers/base/core.c:3643
 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+0x457/0x920 drivers/base/firmware_loader/fallback.c:234
 _request_firmware+0x956/0xf60 drivers/base/firmware_loader/main.c:856
 request_firmware_work_func+0xd7/0x230 drivers/base/firmware_loader/main.c:1105
 process_one_work+0x8ba/0x14b0 kernel/workqueue.c:2289
 worker_thread+0x598/0xec0 kernel/workqueue.c:2436
 kthread+0x294/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>