bisecting fixing commit since cf52ad5ff16c38a62a6536b5e7612b56794f5a5e
building syzkaller on 0c5d9412d774262384cbdbe9d672b077364ed776
testing commit cf52ad5ff16c38a62a6536b5e7612b56794f5a5e
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 2477ed22fcc189b4045fd1e0ff7bfe882de7215dba32cb5e946c3081fc1cd214
run #0: crashed: KASAN: use-after-free Read in kernfs_next_descendant_post
run #1: crashed: WARNING in firmware_fallback_sysfs
run #2: crashed: WARNING in firmware_fallback_sysfs
run #3: crashed: WARNING in firmware_fallback_sysfs
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 6441998e2e37131b0a4c310af9156d79d3351c16
testing commit 6441998e2e37131b0a4c310af9156d79d3351c16
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: ffaef5150c4af72d1fb76e3269c75eda33ea0953516448ba341f37eb3abfa3a8
all runs: crashed: WARNING in firmware_fallback_sysfs
revisions tested: 2, total time: 22m29.186615442s (build: 13m15.680582998s, test: 8m36.094946187s)
the crash still happens on HEAD
commit msg: Merge tag 'audit-pr-20211216' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
crash: WARNING in firmware_fallback_sysfs
sysfs group 'power' not found for kobject 'ueagle-atm!eagleI.fw'
WARNING: CPU: 0 PID: 135 at fs/sysfs/group.c:278 sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:278
Modules linked in:
CPU: 0 PID: 135 Comm: kworker/0:2 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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 40 12 dc 88 e8 4e 27 5f 06 <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 e8 2e 1f d1 ff e9 26 ff ff ff 48
RSP: 0018:ffffc900023efac8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff8938e920 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff88cb5700 RDI: fffff5200047df4b
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8ee64a3f
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888021cb5008
R13: 1ffff9200047df64 R14: ffff88806efdf200 R15: ffff88806efdf2c0
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1a950f0000 CR3: 0000000061974000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 device_del+0x1f4/0xc20 drivers/base/core.c:3558
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:545 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:583 [inline]
 firmware_fallback_sysfs+0x7c9/0xb60 drivers/base/firmware_loader/fallback.c:659
 _request_firmware+0x663/0xd20 drivers/base/firmware_loader/main.c:774
 request_firmware_work_func+0xd7/0x230 drivers/base/firmware_loader/main.c:1020
 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298
 worker_thread+0x598/0x1040 kernel/workqueue.c:2445
 kthread+0x3ab/0x480 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>