------------[ cut here ]------------
WARNING: CPU: 0 PID: 6245 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 6245 Comm: syz.8.349 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 3d f7 d8 ff 85 db 48 c7 c0 f2 ff ff ff 49 0f 44 c6 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 c0 f3 d8 ff <0f> 0b e9 1c ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c ea fe
RSP: 0000:ffffc90000007350 EFLAGS: 00010246
RAX: ffffffff819ed760 RBX: 0000000000000008 RCX: ffff888028c71dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100518e3b9
R10: ffffed100518e3b9 R11: 1ffff1100518e3b8 R12: ffff888028c73548
R13: 00007ffffffff000 R14: ffffc900000073c8 R15: 0000000020000000
FS: 00007f7d2517d6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000061af2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
____bpf_probe_read_compat kernel/trace/bpf_trace.c:281 [inline]
bpf_probe_read_compat+0xdd/0x170 kernel/trace/bpf_trace.c:277
bpf_prog_5552427ec2450e15+0x40/0x5dc
bpf_dispatcher_nop_func include/linux/bpf.h:888 [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_run2+0x15b/0x2d0 kernel/trace/bpf_trace.c:1915
__traceiter_net_dev_start_xmit+0x6c/0xc0 include/trace/events/net.h:14
trace_net_dev_start_xmit include/trace/events/net.h:14 [inline]
xmit_one net/core/dev.c:3648 [inline]
dev_hard_start_xmit+0x5c7/0x7e0 net/core/dev.c:3665
__dev_queue_xmit+0x19df/0x2ed0 net/core/dev.c:4288
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip6_finish_output2+0x1035/0x1500 net/ipv6/ip6_output.c:130
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbea/0x14a0 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3956
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:debug_lockdep_rcu_enabled+0x25/0x30 kernel/rcu/update.c:281
Code: 00 00 cc cc 00 31 c0 83 3d eb 9e c0 03 00 74 1d 83 3d 62 d1 c0 03 00 74 14 65 48 8b 0d 94 7b 59 76 31 c0 83 b9 ec 0a 00 00 00 <0f> 94 c0 c3 00 00 cc cc 00 00 cc 41 56 53 89 fb e8 16 0a 00 00 41
RSP: 0000:ffffc900030fece0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88805fac18c2 RCX: ffff888028c71dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7819
R10: fffffbfff1ff7819 R11: 1ffffffff1ff7818 R12: ffff88805c7fd448
R13: ffffc900030fedf8 R14: ffffc900030fede0 R15: 1ffff9200061fdbf
rcu_read_lock_held_common kernel/rcu/update.c:104 [inline]
rcu_read_lock_held+0x6/0x40 kernel/rcu/update.c:309
xa_head include/linux/xarray.h:1181 [inline]
xas_start+0x292/0x770 lib/xarray.c:188
xas_load+0x28/0x140 lib/xarray.c:233
mapping_get_entry mm/filemap.c:1826 [inline]
pagecache_get_page+0x19d/0xef0 mm/filemap.c:1894
shmem_getpage_gfp+0x305/0x2d40 mm/shmem.c:1841
shmem_getpage mm/shmem.c:151 [inline]
shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
__generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
__kernel_write+0x4f9/0x930 fs/read_write.c:539
__dump_emit+0x243/0x360 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2ff7/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x1419/0x2960 fs/coredump.c:894
get_signal+0x40a/0x12c0 kernel/signal.c:2886
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1504
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f7d26f57ed1
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f7d271af180 RCX: 00007f7d26f57ec9
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f7d26fdaf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f7d271af218 R14: 00007f7d271af180 R15: 00007fff2f6a4b88
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: cc int3
3: cc int3
4: 00 31 add %dh,(%rcx)
6: c0 83 3d eb 9e c0 03 rolb $0x3,-0x3f6114c3(%rbx)
d: 00 74 1d 83 add %dh,-0x7d(%rbp,%rbx,1)
11: 3d 62 d1 c0 03 cmp $0x3c0d162,%eax
16: 00 74 14 65 add %dh,0x65(%rsp,%rdx,1)
1a: 48 8b 0d 94 7b 59 76 mov 0x76597b94(%rip),%rcx # 0x76597bb5
21: 31 c0 xor %eax,%eax
23: 83 b9 ec 0a 00 00 00 cmpl $0x0,0xaec(%rcx)
* 2a: 0f 94 c0 sete %al <-- trapping instruction
2d: c3 ret
2e: 00 00 add %al,(%rax)
30: cc int3
31: cc int3
32: 00 00 add %al,(%rax)
34: cc int3
35: 41 56 push %r14
37: 53 push %rbx
38: 89 fb mov %edi,%ebx
3a: e8 16 0a 00 00 call 0xa55
3f: 41 rex.B