bisecting fixing commit since e77a830c8297c088f80e337cf888af7d014a16d7
building syzkaller on 17f0b706a417a8a15d472f64a6a8b01872da1661
testing commit e77a830c8297c088f80e337cf888af7d014a16d7 with gcc (GCC) 10.2.1 20210217
kernel signature: 18981911b6d62eb3b8fb714325e5b34637b56b0013305332c7255e45a0fbb506
run #0: crashed: WARNING in pvr2_i2c_core_done
run #1: crashed: WARNING in put_i2c_dev
run #2: crashed: WARNING in pvr2_i2c_core_done
run #3: crashed: WARNING in pvr2_i2c_core_done
run #4: crashed: WARNING in put_i2c_dev
run #5: crashed: WARNING in pvr2_i2c_core_done
run #6: crashed: WARNING in pvr2_i2c_core_done
run #7: crashed: WARNING in put_i2c_dev
run #8: crashed: WARNING in pvr2_i2c_core_done
run #9: crashed: WARNING in put_i2c_dev
run #10: crashed: WARNING in pvr2_i2c_core_done
run #11: crashed: WARNING in pvr2_i2c_core_done
run #12: crashed: WARNING in put_i2c_dev
run #13: crashed: WARNING in pvr2_i2c_core_done
run #14: crashed: WARNING in put_i2c_dev
run #15: crashed: WARNING in pvr2_i2c_core_done
run #16: crashed: WARNING in pvr2_i2c_core_done
run #17: crashed: WARNING in pvr2_i2c_core_done
run #18: crashed: WARNING in pvr2_i2c_core_done
run #19: crashed: WARNING in pvr2_i2c_core_done
testing current HEAD 8ecfa36cd4db3275bf3b6c6f32c7e3c6bb537de2
testing commit 8ecfa36cd4db3275bf3b6c6f32c7e3c6bb537de2 with gcc (GCC) 10.2.1 20210217
kernel signature: b4421aba425ed1f240cfc3ace8c706f541b06c6f2bf76965605ebdb53da05a54
run #0: crashed: WARNING in pvr2_i2c_core_done
run #1: crashed: WARNING in pvr2_i2c_core_done
run #2: crashed: WARNING in put_i2c_dev
run #3: crashed: WARNING in pvr2_i2c_core_done
run #4: crashed: WARNING in pvr2_i2c_core_done
run #5: crashed: WARNING in pvr2_i2c_core_done
run #6: crashed: WARNING in put_i2c_dev
run #7: crashed: WARNING in pvr2_i2c_core_done
run #8: crashed: WARNING in pvr2_i2c_core_done
run #9: crashed: WARNING in pvr2_i2c_core_done
revisions tested: 2, total time: 21m28.186403528s (build: 13m36.88092462s, test: 7m7.980335247s)
the crash still happens on HEAD
commit msg: Merge tag 'riscv-for-linus-5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
crash: WARNING in pvr2_i2c_core_done
------------[ cut here ]------------
sysfs group 'power' not found for kobject '1-0044'
WARNING: CPU: 1 PID: 3959 at fs/sysfs/group.c:279 sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:279
Modules linked in:
CPU: 1 PID: 3959 Comm: pvrusb2-context Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:sysfs_remove_group+0xf2/0x140 fs/sysfs/group.c:279
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 a0 2c bb 88 e8 e7 85 32 06 <0f> 0b 48 83 c4 08 5b 5d 41 5c c3 e8 be 7e d0 ff e9 26 ff ff ff 48
RSP: 0018:ffffc900038d7bb0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffffff8914a0e0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff88fe03a0 RDI: fffff5200071af68
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880ba12fec7
R10: ffffed1017425fd8 R11: 7267207366737973 R12: ffff88802672b020
R13: 1ffff9200071af81 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000970004 CR3: 00000000426b6000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 device_del+0x1f4/0xc10 drivers/base/core.c:3489
 device_unregister+0x11/0xa0 drivers/base/core.c:3545
 i2c_unregister_device include/linux/err.h:41 [inline]
 __unregister_client drivers/i2c/i2c-core-base.c:1637 [inline]
 __unregister_client+0x5d/0x70 drivers/i2c/i2c-core-base.c:1633
 device_for_each_child+0xd3/0x140 drivers/base/core.c:3645
 i2c_del_adapter+0x2b3/0x5f0 drivers/i2c/i2c-core-base.c:1700
 pvr2_i2c_core_done+0x4b/0xa0 drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:652
 pvr2_hdw_destroy+0x144/0x350 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2679
 pvr2_context_destroy+0x6a/0x1e0 drivers/media/usb/pvrusb2/pvrusb2-context.c:70
 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline]
 pvr2_context_thread_func+0x4a2/0x680 drivers/media/usb/pvrusb2/pvrusb2-context.c:158
 kthread+0x36f/0x450 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294