[syzbot] [bpf?] [trace?] possible deadlock in sctp_err_lookup

From: syzbot
Date: Thu Nov 16 2023 - 05:35:42 EST

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Hello,

syzbot found the following issue on:

HEAD commit: f31817cbcf48 Add linux-next specific files for 20231116
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11a32f97680000
kernel config: https://syzkaller.appspot.com/x/.config?x=f59345f1d0a928c
dashboard link: https://syzkaller.appspot.com/bug?extid=422ecd5adb35122711b7
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/987488cb251e/disk-f31817cb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6d4a82d8bd4b/vmlinux-f31817cb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fc43dee9cb86/bzImage-f31817cb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+422ecd5adb35122711b7@xxxxxxxxxxxxxxxxxxxxxxxxx

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
6.7.0-rc1-next-20231116-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.2/5088 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire:
ffff888025d21bd8 (&sighand->siglock){+.+.}-{2:2}, at: __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422

and this task is already holding:
ffff88802dd927b0 (slock-AF_INET6){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff88802dd927b0 (slock-AF_INET6){+.-.}-{2:2}, at: __tcp_close+0x4e6/0xfd0 net/ipv4/tcp.c:2843
which would create a new lock dependency:
(slock-AF_INET6){+.-.}-{2:2} -> (&sighand->siglock){+.+.}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(slock-AF_INET6){+.-.}-{2:2}

... which became SOFTIRQ-irq-safe 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]
sctp_err_lookup+0x488/0xb50 net/sctp/input.c:523
sctp_v6_err+0x201/0x540 net/sctp/ipv6.c:175
icmpv6_notify+0x337/0x750 net/ipv6/icmp.c:867
icmpv6_rcv+0x882/0x19c0 net/ipv6/icmp.c:1013
ip6_protocol_deliver_rcu+0x170/0x13e0 net/ipv6/ip6_input.c:438
ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_input+0xa1/0xc0 net/ipv6/ip6_input.c:492
dst_input include/net/dst.h:461 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ipv6_rcv+0x24e/0x380 net/ipv6/ip6_input.c:310
__netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5529
__netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5643
process_backlog+0x101/0x6b0 net/core/dev.c:5971
__napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6533
napi_poll net/core/dev.c:6602 [inline]
net_rx_action+0x956/0xe90 net/core/dev.c:6735
__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]
icmp6_send+0x7d5/0x2b10 net/ipv6/icmp.c:633
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_pkt_drop+0x1f3/0x860 net/ipv6/route.c:4515
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_xmit+0x1234/0x1cc0 net/ipv6/ip6_output.c:358
sctp_v6_xmit+0xc1b/0x1110 net/sctp/ipv6.c:248
sctp_packet_transmit+0x22e1/0x3020 net/sctp/output.c:653
sctp_packet_singleton+0x19f/0x370 net/sctp/outqueue.c:783
sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
sctp_outq_flush+0x54d/0x3340 net/sctp/outqueue.c:1212
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1818 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
sctp_do_sm+0x178f/0x5c50 net/sctp/sm_sideeffect.c:1169
sctp_primitive_ASSOCIATE+0x9c/0xc0 net/sctp/primitive.c:73
__sctp_connect+0x9e9/0xc30 net/sctp/socket.c:1233
sctp_connect net/sctp/socket.c:4811 [inline]
sctp_inet_connect+0x15f/0x1f0 net/sctp/socket.c:4826
__sys_connect_file+0x15b/0x1a0 net/socket.c:2046
__sys_connect+0x145/0x170 net/socket.c:2063
__do_sys_connect net/socket.c:2073 [inline]
__se_sys_connect net/socket.c:2070 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2070
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

to a SOFTIRQ-irq-unsafe lock:
(&sighand->siglock){+.+.}-{2:2}

... which became SOFTIRQ-irq-unsafe 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

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&sighand->siglock);
local_irq_disable();
lock(slock-AF_INET6);
lock(&sighand->siglock);
<Interrupt>
lock(slock-AF_INET6);

*** DEADLOCK ***

5 locks held by syz-executor.2/5088:
#0: ffff888078a5dc10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#0: ffff888078a5dc10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x260 net/socket.c:658
#1: ffff88802dd92830 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1720 [inline]
#1: ffff88802dd92830 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_close+0x1d/0xc0 net/ipv4/tcp.c:2920
#2: ffff88802dd927b0 (slock-AF_INET6){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff88802dd927b0 (slock-AF_INET6){+.-.}-{2:2}, at: __tcp_close+0x4e6/0xfd0 net/ipv4/tcp.c:2843
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2310 [inline]
#3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x410 kernel/trace/bpf_trace.c:2350
#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: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (slock-AF_INET6){+.-.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
lock_sock_nested+0x5f/0xf0 net/core/sock.c:3522
lock_sock include/net/sock.h:1720 [inline]
udpv6_destroy_sock+0x1c/0x240 net/ipv6/udp.c:1663
sk_common_release+0x68/0x3a0 net/core/sock.c:3718
inet_release+0x132/0x270 net/ipv4/af_inet.c:433
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release+0xae/0x260 net/socket.c:659
sock_close+0x1c/0x20 net/socket.c:1419
__fput+0x270/0xbb0 fs/file_table.c:394
__fput_sync+0x47/0x50 fs/file_table.c:475
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close fs/open.c:1575 [inline]
__x64_sys_close+0x86/0xf0 fs/open.c:1575
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
IN-SOFTIRQ-W 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]
sctp_err_lookup+0x488/0xb50 net/sctp/input.c:523
sctp_v6_err+0x201/0x540 net/sctp/ipv6.c:175
icmpv6_notify+0x337/0x750 net/ipv6/icmp.c:867
icmpv6_rcv+0x882/0x19c0 net/ipv6/icmp.c:1013
ip6_protocol_deliver_rcu+0x170/0x13e0 net/ipv6/ip6_input.c:438
ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_input+0xa1/0xc0 net/ipv6/ip6_input.c:492
dst_input include/net/dst.h:461 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ipv6_rcv+0x24e/0x380 net/ipv6/ip6_input.c:310
__netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5529
__netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5643
process_backlog+0x101/0x6b0 net/core/dev.c:5971
__napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6533
napi_poll net/core/dev.c:6602 [inline]
net_rx_action+0x956/0xe90 net/core/dev.c:6735
__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]
icmp6_send+0x7d5/0x2b10 net/ipv6/icmp.c:633
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_pkt_drop+0x1f3/0x860 net/ipv6/route.c:4515
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ip6_xmit+0x1234/0x1cc0 net/ipv6/ip6_output.c:358
sctp_v6_xmit+0xc1b/0x1110 net/sctp/ipv6.c:248
sctp_packet_transmit+0x22e1/0x3020 net/sctp/output.c:653
sctp_packet_singleton+0x19f/0x370 net/sctp/outqueue.c:783
sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
sctp_outq_flush+0x54d/0x3340 net/sctp/outqueue.c:1212
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1818 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
sctp_do_sm+0x178f/0x5c50 net/sctp/sm_sideeffect.c:1169
sctp_primitive_ASSOCIATE+0x9c/0xc0 net/sctp/primitive.c:73
__sctp_connect+0x9e9/0xc30 net/sctp/socket.c:1233
sctp_connect net/sctp/socket.c:4811 [inline]
sctp_inet_connect+0x15f/0x1f0 net/sctp/socket.c:4826
__sys_connect_file+0x15b/0x1a0 net/socket.c:2046
__sys_connect+0x145/0x170 net/socket.c:2063
__do_sys_connect net/socket.c:2073 [inline]
__se_sys_connect net/socket.c:2070 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2070
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
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
lock_sock_nested+0x5f/0xf0 net/core/sock.c:3522
lock_sock include/net/sock.h:1720 [inline]
udpv6_destroy_sock+0x1c/0x240 net/ipv6/udp.c:1663
sk_common_release+0x68/0x3a0 net/core/sock.c:3718
inet_release+0x132/0x270 net/ipv4/af_inet.c:433
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release+0xae/0x260 net/socket.c:659
sock_close+0x1c/0x20 net/socket.c:1419
__fput+0x270/0xbb0 fs/file_table.c:394
__fput_sync+0x47/0x50 fs/file_table.c:475
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close fs/open.c:1575 [inline]
__x64_sys_close+0x86/0xf0 fs/open.c:1575
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
}
... key at: [<ffffffff92b36fc0>] af_family_slock_keys+0xa0/0x300

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&sighand->siglock){+.+.}-{2:2} {
HARDIRQ-ON-W 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
SOFTIRQ-ON-W 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
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
calculate_sigpending+0x44/0xa0 kernel/signal.c:197
ret_from_fork+0x23/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
}
... key at: [<ffffffff90b49f80>] __key.341+0x0/0x40
... acquired at:
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
tcp_saved_syn_free include/linux/tcp.h:568 [inline]
tcp_v4_destroy_sock+0x256/0x560 net/ipv4/tcp_ipv4.c:2538
inet_csk_destroy_sock+0x19a/0x450 net/ipv4/inet_connection_sock.c:1198
__tcp_close+0xbf0/0xfd0 net/ipv4/tcp.c:2909
tcp_close+0x2d/0xc0 net/ipv4/tcp.c:2921
inet_release+0x132/0x270 net/ipv4/af_inet.c:433
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release+0xae/0x260 net/socket.c:659
sock_close+0x1c/0x20 net/socket.c:1419
__fput+0x270/0xbb0 fs/file_table.c:394
__fput_sync+0x47/0x50 fs/file_table.c:475
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close fs/open.c:1575 [inline]
__x64_sys_close+0x86/0xf0 fs/open.c:1575
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

stack backtrace:
CPU: 1 PID: 5088 Comm: syz-executor.2 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:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline]
check_irq_usage+0xe18/0x1470 kernel/locking/lockdep.c:2865
check_prev_add kernel/locking/lockdep.c:3138 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x247c/0x3b10 kernel/locking/lockdep.c:5136
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
tcp_saved_syn_free include/linux/tcp.h:568 [inline]
tcp_v4_destroy_sock+0x256/0x560 net/ipv4/tcp_ipv4.c:2538
inet_csk_destroy_sock+0x19a/0x450 net/ipv4/inet_connection_sock.c:1198
__tcp_close+0xbf0/0xfd0 net/ipv4/tcp.c:2909
tcp_close+0x2d/0xc0 net/ipv4/tcp.c:2921
inet_release+0x132/0x270 net/ipv4/af_inet.c:433
inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:485
__sock_release+0xae/0x260 net/socket.c:659
sock_close+0x1c/0x20 net/socket.c:1419
__fput+0x270/0xbb0 fs/file_table.c:394
__fput_sync+0x47/0x50 fs/file_table.c:475
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close fs/open.c:1575 [inline]
__x64_sys_close+0x86/0xf0 fs/open.c:1575
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: 0033:0x7f4f6907b9da
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007ffe444ef290 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4f6907b9da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffe444ef30c R08: 00000000000003b8 R09: 0079746972756365
R10: 00007f4f691786a0 R11: 0000000000000293 R12: 0000000000000032
R13: 00000000000aa51e R14: 00000000000aa4b4 R15: 0000000000000002
</TASK>

---
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