syzbot

================================
WARNING: inconsistent lock state
6.9.0-rc6-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
sshd/5064 [HC0[0]:SC1[1]:HE0:SE0] takes:
ffff8880b9538a80 (lock#9){+.?.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b9538a80 (lock#9){+.?.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x7f/0x790 mm/mmap_lock.c:237
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire kernel/locking/lockdep.c:5754 [inline]
  lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
  local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
  __mmap_lock_do_trace_acquire_returned+0x97/0x790 mm/mmap_lock.c:237
  __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
  mmap_read_lock include/linux/mmap_lock.h:147 [inline]
  process_vm_rw_single_vec mm/process_vm_access.c:105 [inline]
  process_vm_rw_core.constprop.0+0x7d7/0xa10 mm/process_vm_access.c:216
  process_vm_rw+0x301/0x360 mm/process_vm_access.c:284
  __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
  __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
  __x64_sys_process_vm_readv+0xe2/0x1c0 mm/process_vm_access.c:292
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
  entry_SYSCALL_64_after_hwframe+0x77/0x7f
irq event stamp: 51059
hardirqs last  enabled at (51058): [<ffffffff8adf49d6>] __do_softirq+0x1d6/0x922 kernel/softirq.c:538
hardirqs last disabled at (51059): [<ffffffff8adf1bd5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (51059): [<ffffffff8adf1bd5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
softirqs last  enabled at (51052): [<ffffffff8adf4dda>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (51052): [<ffffffff8adf4dda>] __do_softirq+0x5da/0x922 kernel/softirq.c:583
softirqs last disabled at (51057): [<ffffffff81522809>] invoke_softirq kernel/softirq.c:428 [inline]
softirqs last disabled at (51057): [<ffffffff81522809>] __irq_exit_rcu kernel/softirq.c:633 [inline]
softirqs last disabled at (51057): [<ffffffff81522809>] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645

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

       CPU0
       ----
  lock(lock#9);
  <Interrupt>
    lock(lock#9);

 *** DEADLOCK ***

6 locks held by sshd/5064:
 #0: ffff88801fdd9ad8 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1673 [inline]
 #0: ffff88801fdd9ad8 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x20/0x50 net/ipv4/tcp.c:1341
 #1: ffffc90000a08cb0 (&(&ssp->srcu_sup->work)->timer){..-.}-{0:0}, at: call_timer_fn+0x11a/0x610 kernel/time/timer.c:1790
 #2: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #2: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #2: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x1020 kernel/workqueue.c:2324
 #3: ffff8880b953d998 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x38e/0x1020 kernel/workqueue.c:2357
 #4: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #4: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #4: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #4: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0xf8/0x440 kernel/trace/bpf_trace.c:2421
 #5: ffff88807d794420 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #5: ffff88807d794420 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0x1e8/0x7d0 kernel/bpf/stackmap.c:141

stack backtrace:
CPU: 1 PID: 5064 Comm: sshd Not tainted 6.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_usage_bug kernel/locking/lockdep.c:3971 [inline]
 valid_state kernel/locking/lockdep.c:4013 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4216 [inline]
 mark_lock+0x923/0xc60 kernel/locking/lockdep.c:4678
 mark_usage kernel/locking/lockdep.c:4567 [inline]
 __lock_acquire+0x13d4/0x3b30 kernel/locking/lockdep.c:5091
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
 __mmap_lock_do_trace_acquire_returned+0x97/0x790 mm/mmap_lock.c:237
 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
 mmap_read_trylock include/linux/mmap_lock.h:166 [inline]
 stack_map_get_build_id_offset+0x5df/0x7d0 kernel/bpf/stackmap.c:141
 __bpf_get_stack+0x6bf/0x700 kernel/bpf/stackmap.c:449
 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1985 [inline]
 bpf_get_stack_raw_tp+0x124/0x160 kernel/trace/bpf_trace.c:1975
 ___bpf_prog_run+0x3e51/0xabd0 kernel/bpf/core.c:1997
 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run3+0x167/0x440 kernel/trace/bpf_trace.c:2421
 __bpf_trace_workqueue_queue_work+0x101/0x140 include/trace/events/workqueue.h:23
 __traceiter_workqueue_queue_work+0x6c/0xc0 include/trace/events/workqueue.h:23
 trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline]
 __queue_work+0x627/0x1020 kernel/workqueue.c:2382
 call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793
 expire_timers kernel/time/timer.c:1839 [inline]
 __run_timers+0x567/0xaf0 kernel/time/timer.c:2418
 __run_timer_base kernel/time/timer.c:2429 [inline]
 __run_timer_base kernel/time/timer.c:2422 [inline]
 run_timer_base+0x111/0x190 kernel/time/timer.c:2438
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2448
 __do_softirq+0x218/0x922 kernel/softirq.c:554
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:633 [inline]
 irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:tcp_cwnd_validate net/ipv4/tcp_output.c:1947 [inline]
RIP: 0010:tcp_write_xmit+0x35e4/0x7e50 net/ipv4/tcp_output.c:2815
Code: c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 3e 3f 00 00 66 89 6b 32 66 44 89 63 30 e9 0f da ff ff <e8> e7 49 43 f8 48 8b 04 24 48 8d b8 a0 01 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc9000313f858 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000536db6ee RCX: ffffffff894a4e78
RDX: ffff888029270000 RSI: 00000000536db6ee RDI: 0000000000000004
RBP: 00000000536db6ee R08: 0000000000000004 R09: 00000000536db6ee
R10: 00000000536db6ee R11: 0000000000000001 R12: ffff88801fdda2a8
R13: 0000000000000000 R14: 0000000000000015 R15: ffffffff8fa0f580
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:2977
 tcp_push+0x221/0x6f0 net/ipv4/tcp.c:738
 tcp_sendmsg_locked+0x2798/0x3470 net/ipv4/tcp.c:1310
 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1342
 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x4b8/0x5c0 net/socket.c:1160
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe4e8516bf2
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:00007fff3f762ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000044 RCX: 00007fe4e8516bf2
RDX: 0000000000000044 RSI: 000056160e7551c0 RDI: 0000000000000004
RBP: 000056160e749240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00005615e677aaa4
R13: 0000000000000050 R14: 00005615e677b3e8 R15: 00007fff3f762f58
 </TASK>
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   7:	4c 89 f0             	mov    %r14,%rax
   a:	83 e0 07             	and    $0x7,%eax
   d:	83 c0 01             	add    $0x1,%eax
  10:	38 d0                	cmp    %dl,%al
  12:	7c 08                	jl     0x1c
  14:	84 d2                	test   %dl,%dl
  16:	0f 85 3e 3f 00 00    	jne    0x3f5a
  1c:	66 89 6b 32          	mov    %bp,0x32(%rbx)
  20:	66 44 89 63 30       	mov    %r12w,0x30(%rbx)
  25:	e9 0f da ff ff       	jmp    0xffffda39
* 2a:	e8 e7 49 43 f8       	call   0xf8434a16 <-- trapping instruction
  2f:	48 8b 04 24          	mov    (%rsp),%rax
  33:	48 8d b8 a0 01 00 00 	lea    0x1a0(%rax),%rdi
  3a:	48                   	rex.W
  3b:	b8 00 00 00 00       	mov    $0x0,%eax