syzbot

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1497
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 4165, name: syz-executor340
1 lock held by syz-executor340/4165:
 #0: ffffffff8c1418b8 (css_set_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:388 [inline]
 #0: ffffffff8c1418b8 (css_set_lock){....}-{2:2}, at: cgroup_get_from_path+0x26/0x2f0 kernel/cgroup/cgroup.c:6627
irq event stamp: 15512
hardirqs last  enabled at (15511): [<ffffffff8153610f>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline]
hardirqs last  enabled at (15511): [<ffffffff8153610f>] finish_lock_switch+0x12f/0x280 kernel/sched/core.c:4784
hardirqs last disabled at (15512): [<ffffffff89aaca7a>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (15512): [<ffffffff89aaca7a>] _raw_spin_lock_irq+0x7a/0xe0 kernel/locking/spinlock.c:170
softirqs last  enabled at (15484): [<ffffffff888bc498>] do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:985 [inline]
softirqs last  enabled at (15484): [<ffffffff888bc498>] ipv6_setsockopt+0x1c38/0x3890 net/ipv6/ipv6_sockglue.c:1009
softirqs last disabled at (15482): [<ffffffff87c684bb>] spin_lock_bh include/linux/spinlock.h:368 [inline]
softirqs last disabled at (15482): [<ffffffff87c684bb>] release_sock+0x2b/0x1b0 net/core/sock.c:3264
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 4165 Comm: syz-executor340 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 ___might_sleep+0x47c/0x600 kernel/sched/core.c:9639
 down_read+0x20/0x2e0 kernel/locking/rwsem.c:1497
 kernfs_walk_and_get_ns+0x81/0x2b0 fs/kernfs/dir.c:908
 kernfs_walk_and_get include/linux/kernfs.h:559 [inline]
 cgroup_get_from_path+0x5f/0x2f0 kernel/cgroup/cgroup.c:6629
 cgroup_mt_check_v1+0x1ae/0x2c0 net/netfilter/xt_cgroup.c:56
 xt_check_match+0x3c6/0xaa0 net/netfilter/x_tables.c:523
 check_match net/ipv6/netfilter/ip6_tables.c:490 [inline]
 find_check_match net/ipv6/netfilter/ip6_tables.c:507 [inline]
 find_check_entry net/ipv6/netfilter/ip6_tables.c:558 [inline]
 translate_table+0x153d/0x2020 net/ipv6/netfilter/ip6_tables.c:735
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x975/0xd00 net/ipv6/netfilter/ip6_tables.c:1646
 nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x1cb8/0x3890 net/ipv6/ipv6_sockglue.c:1014
 tcp_setsockopt+0x21a/0x1d70 net/ipv4/tcp.c:3713
 __sys_setsockopt+0x3d6/0x5e0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f68c836f929
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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:00007ffc12664038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffc12664208 RCX: 00007f68c836f929
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007f68c83e3610 R08: 0000000000001528 R09: 00007ffc12664208
R10: 0000200000002800 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc126641f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

=============================
[ BUG: Invalid wait context ]
5.15.185-syzkaller #0 Tainted: G        W        
-----------------------------
syz-executor340/4165 is trying to lock:
ffffffff8c24e230 (kernfs_rwsem){++++}-{3:3}, at: kernfs_walk_and_get_ns+0x81/0x2b0 fs/kernfs/dir.c:908
other info that might help us debug this:
context-{4:4}
1 lock held by syz-executor340/4165:
 #0: ffffffff8c1418b8 (css_set_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:388 [inline]
 #0: ffffffff8c1418b8 (css_set_lock){....}-{2:2}, at: cgroup_get_from_path+0x26/0x2f0 kernel/cgroup/cgroup.c:6627
stack backtrace:
CPU: 0 PID: 4165 Comm: syz-executor340 Tainted: G        W         5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4664 [inline]
 check_wait_context kernel/locking/lockdep.c:4725 [inline]
 __lock_acquire+0x1be9/0x7c60 kernel/locking/lockdep.c:4962
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
 kernfs_walk_and_get_ns+0x81/0x2b0 fs/kernfs/dir.c:908
 kernfs_walk_and_get include/linux/kernfs.h:559 [inline]
 cgroup_get_from_path+0x5f/0x2f0 kernel/cgroup/cgroup.c:6629
 cgroup_mt_check_v1+0x1ae/0x2c0 net/netfilter/xt_cgroup.c:56
 xt_check_match+0x3c6/0xaa0 net/netfilter/x_tables.c:523
 check_match net/ipv6/netfilter/ip6_tables.c:490 [inline]
 find_check_match net/ipv6/netfilter/ip6_tables.c:507 [inline]
 find_check_entry net/ipv6/netfilter/ip6_tables.c:558 [inline]
 translate_table+0x153d/0x2020 net/ipv6/netfilter/ip6_tables.c:735
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x975/0xd00 net/ipv6/netfilter/ip6_tables.c:1646
 nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x1cb8/0x3890 net/ipv6/ipv6_sockglue.c:1014
 tcp_setsockopt+0x21a/0x1d70 net/ipv4/tcp.c:3713
 __sys_setsockopt+0x3d6/0x5e0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f68c836f929
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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:00007ffc12664038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffc12664208 RCX: 00007f68c836f929
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007f68c83e3610 R08: 0000000000001528 R09: 000