bisecting fixing commit since 442489c219235991de86d0277b5d859ede6d8792
building syzkaller on b712935571355df44e126c5b27c98ccd53d1d18b
testing commit 442489c219235991de86d0277b5d859ede6d8792 with gcc (GCC) 8.4.1 20210217
kernel signature: 88ac2acfccec89cef3e9015d80763712d37f136d4c477aab1ff1b3bb0034f724
all runs: crashed: WARNING in cgroup_apply_control_disable
testing current HEAD f78d76e72a4671ea52d12752d92077788b4f5d50
testing commit f78d76e72a4671ea52d12752d92077788b4f5d50 with gcc (GCC) 10.2.1 20210217
kernel signature: 74b07b7d787ba95dfb696a6a2fced8412243d04f35592d52f59b0f1a2d2b27ac
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: OK
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: 24m4.440545349s (build: 11m28.489882847s, test: 11m55.997126419s)
the crash still happens on HEAD
commit msg: Merge tag 'drm-fixes-2021-03-12-1' of git://anongit.freedesktop.org/drm/drm
crash: WARNING in cgroup_apply_control_disable
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7420 at kernel/cgroup/cgroup.c:3100 cgroup_ss_mask kernel/cgroup/cgroup.c:442 [inline]
WARNING: CPU: 1 PID: 7420 at kernel/cgroup/cgroup.c:3100 cgroup_apply_control_disable+0x348/0x450 kernel/cgroup/cgroup.c:3103
Modules linked in:
CPU: 1 PID: 7420 Comm: syz-executor.3 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cgroup_apply_control_disable+0x348/0x450 kernel/cgroup/cgroup.c:3100
Code: 00 00 48 8d 78 08 48 89 fe 48 c1 ee 03 42 0f b6 34 3e 40 84 f6 74 0a 40 80 fe 03 0f 8e da 00 00 00 0f b7 40 08 e9 fe fe ff ff <0f> 0b e9 59 fe ff ff 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0018:ffffc900009c7ae0 EFLAGS: 00010202
RAX: 1ffff11020128482 RBX: ffffffff8953f840 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff87cb2c80 RDI: ffff888100942410
RBP: ffff888113072000 R08: 0000000000000001 R09: ffffffff8bfafba7
R10: fffffbfff17f5f74 R11: 0000000000000903 R12: ffffffff894eb2c0
R13: ffff888100942400 R14: ffff888113072000 R15: dffffc0000000000
FS:  00000000022c6400(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f933cb85000 CR3: 000000011942e001 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 cgroup_finalize_control kernel/cgroup/cgroup.c:3167 [inline]
 rebind_subsystems+0x3af/0xa90 kernel/cgroup/cgroup.c:1740
 cgroup_setup_root+0x2ce/0x7b0 kernel/cgroup/cgroup.c:1974
 cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1195 [inline]
 cgroup1_get_tree+0x7a1/0xbc0 kernel/cgroup/cgroup-v1.c:1212
 vfs_get_tree+0x7f/0x2c0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x7f3/0x1a10 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount fs/namespace.c:3431 [inline]
 __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3431
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465c7a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 88 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee2f02878 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffee2f028b8 RCX: 0000000000465c7a
RDX: 00000000004b753b RSI: 00000000004ad236 RDI: 00000000004ad1f9
RBP: 00007ffee2f028b0 R08: 00000000004bc388 R09: 00007ffee2f022f0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee2f028b0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000400520