================================ 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): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (47260): [] _raw_spin_unlock_irqrestore+0x4e/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (47261): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (47261): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:162 softirqs last enabled at (47236): [] rcu_lock_release include/linux/rcupdate.h:306 [inline] softirqs last enabled at (47236): [] rcu_read_unlock_bh include/linux/rcupdate.h:815 [inline] softirqs last enabled at (47236): [] __dev_queue_xmit+0x86f/0x3d70 net/core/dev.c:4373 softirqs last disabled at (47237): [] do_softirq kernel/softirq.c:454 [inline] softirqs last disabled at (47237): [] do_softirq+0xaa/0xe0 kernel/softirq.c:441 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); 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: __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 __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