bisecting fixing commit since 7f2c5eb458b8855655a19c44cd0043f7f83c595f
building syzkaller on 80a0690249dc4dbbbed95ba197192b99c73694c5
testing commit 7f2c5eb458b8855655a19c44cd0043f7f83c595f with gcc (GCC) 8.4.1 20210217
kernel signature: d850bb141ed68771847ae6ddb6085df7d2ec104211f26a1136c91b1408e5cd30
run #0: crashed: WARNING in cgroup_apply_control_disable
run #1: crashed: WARNING in cgroup_apply_control_disable
run #2: crashed: WARNING in cgroup_apply_control_disable
run #3: crashed: WARNING in cgroup_apply_control_disable
run #4: crashed: WARNING in cgroup_apply_control_disable
run #5: crashed: WARNING in cgroup_apply_control_disable
run #6: crashed: WARNING in cgroup_apply_control_disable
run #7: crashed: WARNING in cgroup_apply_control_disable
run #8: crashed: WARNING in cgroup_apply_control_disable
run #9: crashed: WARNING in cgroup_apply_control_disable
run #10: crashed: WARNING in cgroup_apply_control_disable
run #11: crashed: WARNING in cgroup_apply_control_disable
run #12: crashed: WARNING in cgroup_apply_control_disable
run #13: crashed: WARNING in cgroup_apply_control_disable
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD 3242aa3a635c0958671ee1e4b0958dcc7c4e5c79
testing commit 3242aa3a635c0958671ee1e4b0958dcc7c4e5c79 with gcc (GCC) 8.4.1 20210217
kernel signature: 324a863bacfeba5573155d68dba69baba66cb83c94824b8f57d6eb5d0243e58c
run #0: crashed: WARNING in cgroup_apply_control_disable
run #1: crashed: WARNING in cgroup_apply_control_disable
run #2: crashed: WARNING in cgroup_apply_control_disable
run #3: crashed: WARNING in cgroup_apply_control_disable
run #4: crashed: WARNING in cgroup_apply_control_disable
run #5: crashed: WARNING in cgroup_apply_control_disable
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 34m48.8502073s (build: 16m7.024772856s, test: 17m40.704554467s)
the crash still happens on HEAD
commit msg: Linux 4.14.222
crash: WARNING in cgroup_apply_control_disable
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7230 at kernel/cgroup/cgroup.c:2936 cgroup_ss_mask kernel/cgroup/cgroup.c:441 [inline]
WARNING: CPU: 0 PID: 7230 at kernel/cgroup/cgroup.c:2936 cgroup_apply_control_disable+0x31c/0x410 kernel/cgroup/cgroup.c:2939
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7230 Comm: syz-executor.3 Not tainted 4.14.222-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.7+0x25/0x25 kernel/panic.c:547
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:cgroup_apply_control_disable+0x31c/0x410 kernel/cgroup/cgroup.c:2936
RSP: 0018:ffff8881d15ef8a0 EFLAGS: 00010202
RAX: 1ffff1103b3fb8b3 RBX: ffff8881d9fdc580 RCX: ffffed103aa70930
RDX: 1ffffffff0fe2bc1 RSI: 00000000ffffffff RDI: ffff8881d9fdc598
RBP: ffff8881d15ef900 R08: 1ffff1103aa70930 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87fdaf80
R13: ffff8881d8a364c0 R14: ffffffff87fa32e0 R15: dffffc0000000000
 cgroup_finalize_control kernel/cgroup/cgroup.c:3003 [inline]
 rebind_subsystems+0x34e/0xa80 kernel/cgroup/cgroup.c:1631
 cgroup_setup_root+0x348/0x8f0 kernel/cgroup/cgroup.c:1900
 cgroup1_mount+0x49a/0xb90 kernel/cgroup/cgroup-v1.c:1245
 cgroup_mount+0x14b/0x850 kernel/cgroup/cgroup.c:2024
 mount_fs+0x7f/0x270 fs/super.c:1237
 vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x352/0x2af0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xb1/0xd0 fs/namespace.c:3072
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465c8a
RSP: 002b:00007ffdc52fecb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdc52fecf8 RCX: 0000000000465c8a
RDX: 00000000004b753b RSI: 00000000004ad236 RDI: 00000000004ad1f9
RBP: 00007ffdc52fecf0 R08: 00000000004bc388 R09: 00007ffdc52fe730
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc52fecf0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000400520
Kernel Offset: disabled
Rebooting in 86400 seconds..