bisecting fixing commit since d6efb3ac3e6c19ab722b28bdb9252bae0b9676b6
building syzkaller on cb436c69d9bcb0330518a48559649c9436ed5e7a
testing commit d6efb3ac3e6c19ab722b28bdb9252bae0b9676b6 with gcc (GCC) 8.1.0
kernel signature: 0a1ba4a376680e6a64dc711239cedd3437c7346a274c2004830b8ad8910d1f9c
all runs: crashed: WARNING in cgroup_apply_control_disable
testing current HEAD 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d
testing commit 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d with gcc (GCC) 8.1.0
kernel signature: bc24e9db1b570cd1d35231a960b9c4f7603e162b9945a5cfbb13dd74d7d6a80a
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: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
Reproducer flagged being flaky
revisions tested: 2, total time: 21m57.267293623s (build: 10m5.20080078s, test: 11m12.499266211s)
the crash still happens on HEAD
commit msg: Merge tag 'task_work-2021-01-19' of git://git.kernel.dk/linux-block
crash: WARNING in cgroup_apply_control_disable
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7427 at kernel/cgroup/cgroup.c:3100 cgroup_ss_mask kernel/cgroup/cgroup.c:442 [inline]
WARNING: CPU: 0 PID: 7427 at kernel/cgroup/cgroup.c:3100 cgroup_apply_control_disable+0x131/0x150 kernel/cgroup/cgroup.c:3103
Modules linked in:
CPU: 1 PID: 7427 Comm: syz-executor.5 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cgroup_apply_control_disable+0x131/0x150 kernel/cgroup/cgroup.c:3100
Code: 3b e8 03 95 ff ff 84 c0 75 84 e9 69 ff ff ff 48 89 df e8 92 a7 ff ff e9 72 ff ff ff 49 8b 84 24 80 02 00 00 0f b7 40 08 eb c1 <0f> 0b eb 8e 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 90 66
RSP: 0018:ffffc90000243ce8 EFLAGS: 00010202
RAX: ffff8881099dfe00 RBX: ffff8881099dfe00 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff83ea800c RDI: 0000000000000282
RBP: ffffffff845e4ee0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8881162c8000
R13: ffff8881162c8000 R14: ffffffff845e4f08 R15: ffffffff845f2960
FS:  00000000020fb940(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f941ac0e740 CR3: 00000001099ad000 CR4: 0000000000350ef0
Call Trace:
 cgroup_finalize_control kernel/cgroup/cgroup.c:3167 [inline]
 rebind_subsystems+0x198/0x3f0 kernel/cgroup/cgroup.c:1740
 cgroup_setup_root+0x151/0x390 kernel/cgroup/cgroup.c:1974
 cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1192 [inline]
 cgroup1_get_tree+0x41d/0x690 kernel/cgroup/cgroup-v1.c:1209
 vfs_get_tree+0x1d/0xb0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x6f7/0xa70 fs/namespace.c:3211
 do_mount+0x70/0x90 fs/namespace.c:3224
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0xbf/0xe0 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45f72a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd 8b fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 aa 8b fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd58934a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd5893500 RCX: 000000000045f72a
RDX: 00000000004cbd9e RSI: 00000000004c18a5 RDI: 00000000004c1868
RBP: 0000000000000000 R08: 00000000004d0bc8 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000418760
R13: 00007ffdd5893728 R14: 0000000000000000 R15: 0000000000000000