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WARNING: CPU: 1 PID: 23 at mm/maccess.c:226 copy_from_user_nofault+0x15c/0x1c0 mm/maccess.c:-1
Modules linked in:
CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events iterate_cleanup_work
RIP: 0010:copy_from_user_nofault+0x15c/0x1c0 mm/maccess.c:226
Code: db 48 c7 c0 f2 ff ff ff 48 0f 44 c5 eb 0c e8 3b b1 d5 ff 48 c7 c0 f2 ff ff ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 24 b1 d5 ff <0f> 0b e9 1e ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff
RSP: 0018:ffffc90000dd09a8 EFLAGS: 00010246
RAX: ffffffff81aa911c RBX: 0000000000000000 RCX: ffff88813fe58000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff81aa902d R09: fffffbfff2131819
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90000dd0a08
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007eff6642e2d0 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
 ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline]
 bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163
 bpf_prog_7e47b8e39696360c+0x32/0x798
 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916
 __bpf_trace_kmem_cache_free+0x99/0xc0 include/trace/events/kmem.h:138
 trace_kmem_cache_free include/trace/events/kmem.h:138 [inline]
 kmem_cache_free+0x1ce/0x1f0 mm/slub.c:3516
 dst_destroy+0x214/0x2f0 net/core/dst.c:120
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763
 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x60 kernel/kcov.c:206
Code: 74 2d 82 7e 65 8b 15 75 2d 82 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c 8b 91 10 16 00 00 <83> fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48 8d 7e 01 8b 89 14
RSP: 0018:ffffc90000ddfae8 EFLAGS: 00000246
RAX: ffffffff889b7e0f RBX: ffff88802b8af078 RCX: ffff88813fe58000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000015e10 R08: ffffffff889b7b6e R09: fffffbfff213182b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90000ddfb80 R14: 1ffff11005715e0f R15: ffffffff889b7e60
 get_next_corpse net/netfilter/nf_conntrack_core.c:2332 [inline]
 nf_ct_iterate_cleanup+0x35f/0x3b0 net/netfilter/nf_conntrack_core.c:2381
 nf_ct_iterate_cleanup_net+0x15e/0x1d0 net/netfilter/nf_conntrack_core.c:2465
 iterate_cleanup_work+0x63/0x110 net/netfilter/nf_nat_masquerade.c:83
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	2d 82 7e 65 8b       	sub    $0x8b657e82,%eax
   5:	15 75 2d 82 7e       	adc    $0x7e822d75,%eax
   a:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  10:	74 11                	je     0x23
  12:	81 fa 00 01 00 00    	cmp    $0x100,%edx
  18:	75 35                	jne    0x4f
  1a:	83 b9 34 16 00 00 00 	cmpl   $0x0,0x1634(%rcx)
  21:	74 2c                	je     0x4f
  23:	8b 91 10 16 00 00    	mov    0x1610(%rcx),%edx
* 29:	83 fa 02             	cmp    $0x2,%edx <-- trapping instruction
  2c:	75 21                	jne    0x4f
  2e:	48 8b 91 18 16 00 00 	mov    0x1618(%rcx),%rdx
  35:	48 8b 32             	mov    (%rdx),%rsi
  38:	48 8d 7e 01          	lea    0x1(%rsi),%rdi
  3c:	8b                   	.byte 0x8b
  3d:	89                   	.byte 0x89
  3e:	14                   	.byte 0x14