syzbot

================================
WARNING: inconsistent lock state
6.7.0-rc1-next-20231116-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
sshd/5054 [HC0[0]:SC1[1]:HE0:SE0] takes:
ffff88802a4ee5d8 (&sighand->siglock){+.?.}-{2:2}, at: __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire kernel/locking/lockdep.c:5753 [inline]
  lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
  __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
  _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:351 [inline]
  class_spinlock_constructor include/linux/spinlock.h:530 [inline]
  ptrace_set_stopped kernel/ptrace.c:391 [inline]
  ptrace_attach+0x401/0x650 kernel/ptrace.c:478
  __do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290
  do_syscall_x64 arch/x86/entry/common.c:51 [inline]
  do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
  entry_SYSCALL_64_after_hwframe+0x62/0x6a
irq event stamp: 47261
hardirqs last  enabled at (47260): [<ffffffff8a84a34e>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (47260): [<ffffffff8a84a34e>] _raw_spin_unlock_irqrestore+0x4e/0x70 kernel/locking/spinlock.c:194
hardirqs last disabled at (47261): [<ffffffff8a84a0fe>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (47261): [<ffffffff8a84a0fe>] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:162
softirqs last  enabled at (47236): [<ffffffff887111cf>] rcu_lock_release include/linux/rcupdate.h:306 [inline]
softirqs last  enabled at (47236): [<ffffffff887111cf>] rcu_read_unlock_bh include/linux/rcupdate.h:815 [inline]
softirqs last  enabled at (47236): [<ffffffff887111cf>] __dev_queue_xmit+0x86f/0x3d70 net/core/dev.c:4373
softirqs last disabled at (47237): [<ffffffff814fe53a>] do_softirq kernel/softirq.c:454 [inline]
softirqs last disabled at (47237): [<ffffffff814fe53a>] do_softirq+0xaa/0xe0 kernel/softirq.c:441

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&sighand->siglock);
  <Interrupt>
    lock(&sighand->siglock);

 *** DEADLOCK ***

6 locks held by sshd/5054:
 #0: ffff88807d4799b0 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1720 [inline]
 #0: ffff88807d4799b0 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x20/0x40 net/ipv4/tcp.c:1339
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __ip_queue_xmit+0x72/0x1a50 net/ipv4/ip_output.c:470
 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x36a/0x2550 net/ipv4/ip_output.c:228
 #3: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #3: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2152 [inline]
 #3: ffffffff8cfacf40 (rcu_callback){....}-{0:0}, at: rcu_core+0x7cc/0x16b0 kernel/rcu/tree.c:2431
 #4: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #4: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #4: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2310 [inline]
 #4: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x410 kernel/trace/bpf_trace.c:2350
 #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405

stack backtrace:
CPU: 1 PID: 5054 Comm: sshd Not tainted 6.7.0-rc1-next-20231116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_usage_bug kernel/locking/lockdep.c:3970 [inline]
 valid_state kernel/locking/lockdep.c:4012 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4215 [inline]
 mark_lock+0x91a/0xc50 kernel/locking/lockdep.c:4677
 mark_usage kernel/locking/lockdep.c:4566 [inline]
 __lock_acquire+0x13c2/0x3b10 kernel/locking/lockdep.c:5090
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422
 lock_task_sighand include/linux/sched/signal.h:748 [inline]
 do_send_sig_info kernel/signal.c:1309 [inline]
 group_send_sig_info+0x288/0x300 kernel/signal.c:1460
 bpf_send_signal_common+0x2e4/0x3a0 kernel/trace/bpf_trace.c:877
 ____bpf_send_signal kernel/trace/bpf_trace.c:882 [inline]
 bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:880
 bpf_prog_9fbc3d1d47c9b36c+0x22/0x29
 bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline]
 __bpf_prog_run include/linux/filter.h:651 [inline]
 bpf_prog_run include/linux/filter.h:658 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2311 [inline]
 bpf_trace_run2+0x14e/0x410 kernel/trace/bpf_trace.c:2350
 trace_kfree include/trace/events/kmem.h:94 [inline]
 kfree+0xf6/0x150 mm/slab_common.c:1043
 security_cred_free+0xc3/0x130 security/security.c:3018
 put_cred_rcu+0x126/0x570 kernel/cred.c:118
 rcu_do_batch kernel/rcu/tree.c:2158 [inline]
 rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2431
 __do_softirq+0x216/0x8d5 kernel/softirq.c:553
 do_softirq kernel/softirq.c:454 [inline]
 do_softirq+0xaa/0xe0 kernel/softirq.c:441
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xfc/0x120 kernel/softirq.c:381
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:817 [inline]
 __dev_queue_xmit+0x884/0x3d70 net/core/dev.c:4373
 dev_queue_xmit include/linux/netdevice.h:3112 [inline]
 neigh_hh_output include/net/neighbour.h:526 [inline]
 neigh_output include/net/neighbour.h:540 [inline]
 ip_finish_output2+0x16a4/0x2550 net/ipv4/ip_output.c:235
 __ip_finish_output net/ipv4/ip_output.c:313 [inline]
 __ip_finish_output+0x38b/0x650 net/ipv4/ip_output.c:295
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x7cb/0x1a50 net/ipv4/ip_output.c:535
 __tcp_transmit_skb+0x1aa5/0x3d10 net/ipv4/tcp_output.c:1462
 tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
 tcp_write_xmit+0xfcb/0x7f10 net/ipv4/tcp_output.c:2792
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:2977
 tcp_push_pending_frames include/net/tcp.h:2054 [inline]
 tcp_data_snd_check net/ipv4/tcp_input.c:5638 [inline]
 tcp_rcv_established+0xe1e/0x2130 net/ipv4/tcp_input.c:6066
 tcp_v4_do_rcv+0x68c/0xa10 net/ipv4/tcp_ipv4.c:1906
 sk_backlog_rcv include/net/sock.h:1121 [inline]
 __release_sock+0x132/0x3b0 net/core/sock.c:2968
 release_sock+0x5a/0x1f0 net/core/sock.c:3534
 tcp_sendmsg+0x38/0x40 net/ipv4/tcp.c:1341
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 sock_write_iter+0x29b/0x3d0 net/socket.c:1158
 call_write_iter include/linux/fs.h:2021 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64d/0xdf0 fs/read_write.c:584
 ksys_write+0x1f0/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fc2eb116bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe1bed7178 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fc2eb116bf2