cgroup: cgroup2: unknown option "net_cls" ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/7275 is trying to acquire lock: 00000000fb3fa72a (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] 00000000fb3fa72a (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 but task is already holding lock: 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock include/linux/fs.h:748 [inline] 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: do_last fs/namei.c:3324 [inline] 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: path_openat+0x1071/0x2df0 fs/namei.c:3537 XFS (loop5): Mounting V4 Filesystem which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ovl_i_mutex_dir_key[depth]){++++}: inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow fs/namei.c:1688 [inline] lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573 ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206 ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292 ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903 __lookup_slow+0x246/0x4a0 fs/namei.c:1672 lookup_slow fs/namei.c:1689 [inline] walk_component+0x7ac/0xda0 fs/namei.c:1811 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_parentat+0x51/0x140 fs/namei.c:2367 filename_parentat+0x198/0x590 fs/namei.c:2389 do_renameat2+0x193/0xc70 fs/namei.c:4547 __do_sys_rename fs/namei.c:4675 [inline] __se_sys_rename fs/namei.c:4673 [inline] __x64_sys_rename+0x5d/0x80 fs/namei.c:4673 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #3 (&ovl_i_mutex_dir_key[depth]#2){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 proc_single_show+0xeb/0x170 fs/proc/base.c:755 XFS (loop5): Ending clean mount seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (sb_writers#3){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x6e/0x2a0 fs/super.c:1366 sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: sb_writers#3 --> &ovl_i_mutex_dir_key[depth]#2 --> &ovl_i_mutex_dir_key[depth] Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ovl_i_mutex_dir_key[depth]); lock(&ovl_i_mutex_dir_key[depth]#2); lock(&ovl_i_mutex_dir_key[depth]); lock(sb_writers#3); *** DEADLOCK *** 2 locks held by syz-executor.1/7275: #0: 000000009aaaf08d (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000009aaaf08d (sb_writers#18){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: do_last fs/namei.c:3324 [inline] #1: 0000000031ecf029 (&ovl_i_mutex_dir_key[depth]){++++}, at: path_openat+0x1071/0x2df0 fs/namei.c:3537 stack backtrace: CPU: 0 PID: 7275 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x6e/0x2a0 fs/super.c:1366 sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9b200970a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9b1e609168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f9b201b6f80 RCX: 00007f9b200970a9 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000040 RBP: 00007f9b200f2ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd4e5975bf R14: 00007f9b1e609300 R15: 0000000000022000 XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem xt_check_match: 5 callbacks suppressed x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 cgroup: cgroup2: unknown option "net_cls" XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 cgroup: cgroup2: unknown option "net_cls" cgroup: cgroup2: unknown option "net_cls" cgroup: cgroup2: unknown option "net_cls" cgroup: cgroup2: unknown option "net_cls" cgroup: cgroup2: unknown option "net_cls" cgroup: cgroup2: unknown option "net_cls" XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem nla_parse: 7 callbacks suppressed netlink: 236 bytes leftover after parsing attributes in process `syz-executor.2'. XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem xt_check_match: 21 callbacks suppressed x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. x_tables: ip_tables: ah match: only valid for protocol 51 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. x_tables: ip_tables: ah match: only valid for protocol 51 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. x_tables: ip_tables: ah match: only valid for protocol 51 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. XFS (loop5): Mounting V4 Filesystem XFS (loop5): Ending clean mount XFS (loop5): Quotacheck needed: Please wait. XFS (loop5): Quotacheck: Done. XFS (loop5): Unmounting Filesystem