------------[ cut here ]------------
WARNING: CPU: 0 PID: 12718 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 12718 Comm: syz.2.1806 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 7d 7a 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 00 77 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: 0018:ffffc90000006d08 EFLAGS: 00010246
RAX: ffffffff81a0b690 RBX: 0000000000000000 RCX: ffff88807d66d940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000007137 R09: ffffc90000007104
R10: dffffc0000000000 R11: fffff52000000e27 R12: ffff88807d66f0e8
R13: ffffc9000114b030 R14: ffffc90000006d68 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000a1c000 CR3: 00000000639ff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
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_f2594087b0f175cc+0x32/0x130
bpf_dispatcher_nop_func include/linux/bpf.h:890 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
bpf_prog_run_pin_on_cpu include/linux/filter.h:652 [inline]
bpf_flow_dissect+0x128/0x400 net/core/flow_dissector.c:896
__skb_flow_dissect+0x7dc/0x61d0 net/core/flow_dissector.c:1032
__skb_get_hash_net+0xda/0x4d0 net/core/flow_dissector.c:1713
skb_get_hash include/linux/skbuff.h:1440 [inline]
skb_tx_hash net/core/dev.c:3256 [inline]
netdev_pick_tx+0x337/0xad0 net/core/dev.c:4154
netdev_core_pick_tx+0x141/0x300 net/core/dev.c:4187
__dev_queue_xmit+0x797/0x2e50 net/core/dev.c:4262
neigh_output include/net/neighbour.h:509 [inline]
ip6_finish_output2+0x1174/0x1640 net/ipv6/ip6_output.c:132
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xb7c/0x1410 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3974
call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
expire_timers kernel/time/timer.c:1699 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:1970
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 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:unwind_next_frame+0x69e/0x1cf0 arch/x86/kernel/unwind_orc.c:-1
Code: c1 e8 03 0f b6 04 28 84 c0 74 64 44 89 f9 80 e1 07 38 c1 7c 5a be 02 00 00 00 4c 89 ff 49 89 d6 e8 a7 51 89 00 e9 0c 13 00 00 <48> 8b 44 24 28 80 3c 28 00 4c 8d 73 38 74 08 4c 89 f7 e8 cb 50 89
RSP: 0018:ffffc9000308f050 EFLAGS: 00000297
RAX: 0000000000000015 RBX: ffffc9000308f0e8 RCX: ffffffff8e82938c
RDX: ffffffff8ef241a0 RSI: ffffffff8e82934c RDI: ffffffff81351ed7
RBP: dffffc0000000000 R08: 0000000000000010 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000611e29 R12: ffffffff8ef241fa
R13: 1ffffffff1de483f R14: 0000000000000005 R15: ffffffff8ef241fe
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kmem_cache_free+0x8f/0x210 mm/slub.c:3520
pgtable_pte_page_dtor include/linux/mm.h:2277 [inline]
___pte_free_tlb+0x83/0x2a0 arch/x86/mm/pgtable.c:55
__pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline]
free_pte_range mm/memory.c:231 [inline]
free_pmd_range mm/memory.c:249 [inline]
free_pud_range mm/memory.c:283 [inline]
free_p4d_range mm/memory.c:317 [inline]
free_pgd_range+0x660/0xb10 mm/memory.c:397
free_pgtables+0x271/0x2a0 mm/memory.c:-1
exit_mmap+0x3c8/0x640 mm/mmap.c:3225
__mmput+0x115/0x390 kernel/fork.c:1136
exit_mm+0x632/0x7b0 kernel/exit.c:557
do_exit+0x5b8/0x2100 kernel/exit.c:877
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
get_signal+0x7eb/0x12e0 kernel/signal.c:2917
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:157 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
__syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbb4963a559
Code: Unable to access opcode bytes at RIP 0x7fbb4963a52f.
RSP: 002b:00007fbb478700e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fbb498c1098 RCX: 00007fbb4963a559
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbb498c1098
RBP: 00007fbb498c1090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb498c1128 R14: 00007ffe82426eb0 R15: 00007ffe82426f98
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax
7: 84 c0 test %al,%al
9: 74 64 je 0x6f
b: 44 89 f9 mov %r15d,%ecx
e: 80 e1 07 and $0x7,%cl
11: 38 c1 cmp %al,%cl
13: 7c 5a jl 0x6f
15: be 02 00 00 00 mov $0x2,%esi
1a: 4c 89 ff mov %r15,%rdi
1d: 49 89 d6 mov %rdx,%r14
20: e8 a7 51 89 00 call 0x8951cc
25: e9 0c 13 00 00 jmp 0x1336
* 2a: 48 8b 44 24 28 mov 0x28(%rsp),%rax <-- trapping instruction
2f: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
33: 4c 8d 73 38 lea 0x38(%rbx),%r14
37: 74 08 je 0x41
39: 4c 89 f7 mov %r14,%rdi
3c: e8 .byte 0xe8
3d: cb lret
3e: 50 push %rax
3f: 89 .byte 0x89