syzbot

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1497
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 4350, name: syz.0.17
1 lock held by syz.0.17/4350:
 #0: ffffffff8c344c78 (css_set_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:389 [inline]
 #0: ffffffff8c344c78 (css_set_lock){..-.}-{2:2}, at: cgroup_get_from_path+0x26/0x2f0 kernel/cgroup/cgroup.c:6657
irq event stamp: 1456
hardirqs last  enabled at (1455): [<ffffffff89c64892>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (1455): [<ffffffff89c64892>] _raw_spin_unlock_irqrestore+0x82/0x120 kernel/locking/spinlock.c:194
hardirqs last disabled at (1456): [<ffffffff89c64716>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (1456): [<ffffffff89c64716>] _raw_spin_lock_irq+0x86/0xf0 kernel/locking/spinlock.c:170
softirqs last  enabled at (1424): [<ffffffff88a2e156>] do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:985 [inline]
softirqs last  enabled at (1424): [<ffffffff88a2e156>] ipv6_setsockopt+0x2006/0x3cc0 net/ipv6/ipv6_sockglue.c:1009
softirqs last disabled at (1422): [<ffffffff87db25db>] spin_lock_bh include/linux/spinlock.h:369 [inline]
softirqs last disabled at (1422): [<ffffffff87db25db>] release_sock+0x2b/0x1b0 net/core/sock.c:3272
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 4350 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 ___might_sleep+0x493/0x610 kernel/sched/core.c:9658
 down_read+0x20/0x2e0 kernel/locking/rwsem.c:1497
 kernfs_walk_and_get_ns+0x7e/0x2c0 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:6659
 cgroup_mt_check_v1+0x1d7/0x2e0 net/netfilter/xt_cgroup.c:59
 xt_check_match+0x4e6/0xc50 net/netfilter/x_tables.c:534
 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+0x1531/0x2090 net/ipv6/netfilter/ip6_tables.c:735
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x96d/0xd90 net/ipv6/netfilter/ip6_tables.c:1646
 nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x2086/0x3cc0 net/ipv6/ipv6_sockglue.c:1014
 rawv6_setsockopt+0x29e/0x660 net/ipv6/raw.c:1089
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2212
 __do_sys_setsockopt net/socket.c:2223 [inline]
 __se_sys_setsockopt net/socket.c:2220 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2220
 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: 0033:0x7f4e78109e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3c605b68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f4e78382fa0 RCX: 00007f4e78109e59
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007f4e7819fd6f R08: 0000000000001318 R09: 0000000000000000
R10: 0000200000002b80 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e78382fac R14: 00007f4e78382fa0 R15: 00007f4e78382fa0
 </TASK>

=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G        W        
-----------------------------
syz.0.17/4350 is trying to lock:
ffffffff8c4502d0 (kernfs_rwsem){++++}-{3:3}, at: kernfs_walk_and_get_ns+0x7e/0x2c0 fs/kernfs/dir.c:908
other info that might help us debug this:
context-{4:4}
1 lock held by syz.0.17/4350:
 #0: ffffffff8c344c78 (css_set_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:389 [inline]
 #0: ffffffff8c344c78 (css_set_lock){..-.}-{2:2}, at: cgroup_get_from_path+0x26/0x2f0 kernel/cgroup/cgroup.c:6657
stack backtrace:
CPU: 0 PID: 4350 Comm: syz.0.17 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 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+0x1bf8/0x7d10 kernel/locking/lockdep.c:4962
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
 kernfs_walk_and_get_ns+0x7e/0x2c0 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:6659
 cgroup_mt_check_v1+0x1d7/0x2e0 net/netfilter/xt_cgroup.c:59
 xt_check_match+0x4e6/0xc50 net/netfilter/x_tables.c:534
 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+0x1531/0x2090 net/ipv6/netfilter/ip6_tables.c:735
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x96d/0xd90 net/ipv6/netfilter/ip6_tables.c:1646
 nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x2086/0x3cc0 net/ipv6/ipv6_sockglue.c:1014
 rawv6_setsockopt+0x29e/0x660 net/ipv6/raw.c:1089
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2212
 __do_sys_setsockopt net/socket.c:2223 [inline]
 __se_sys_setsockopt net/socket.c:2220 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2220
 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: 0033:0x7f4e78109e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3c605b68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f4e78382fa0 RCX: 00007f4e78109e59
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007f4e7819fd6f R08: 0000000000001318 R09: 0000000000000000
R10: 0000200000002b80 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e78382fac R14: 00007f4e78382fa0 R15: 00007f4e78382fa0
 </TASK>
xt_cgroup: invalid path, errno=-2