------------[ cut here ]------------
WARNING: CPU: 0 PID: 4326 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 4326 Comm: syz.0.11 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 6d 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 f0 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: 0018:ffffc90000007a08 EFLAGS: 00010246
RAX: ffffffff819ed660 RBX: 0000000000000000 RCX: ffff888025f41dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7a19
R10: fffffbfff1ff7a19 R11: 1ffffffff1ff7a18 R12: ffff888025f43548
R13: 1ffff92000000f50 R14: ffffc90000007a68 R15: 0000000000000000
FS: 00007f36f4db36c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000043000 CR3: 000000005e2ff000 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_user kernel/trace/bpf_trace.c:166 [inline]
bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163
bpf_prog_7e47b8e39696360c+0x32/0xbcc
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_run3+0x17e/0x320 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+0x1e7/0x210 mm/slub.c:3521
rcu_do_batch kernel/rcu/tree.c:2523 [inline]
rcu_core+0x962/0x15d0 kernel/rcu/tree.c:2763
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:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x71/0x290 mm/kasan/generic.c:189
Code: 00 fc ff df 4f 8d 0c 03 48 8d 5c 37 ff 48 c1 eb 03 4e 8d 14 3b 4d 89 d6 4d 29 ce 49 83 fe 10 7f 26 4d 85 f6 0f 84 39 01 00 00 <48> f7 d3 4c 01 db 41 80 39 00 0f 85 c1 01 00 00 49 ff c1 48 ff c3
RSP: 0018:ffffc9000342f560 EFLAGS: 00000202
RAX: 0000000000000101 RBX: 1ffff110057afd38 RCX: ffffffff815b4caa
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88802bd7e9c0
RBP: ffffc9000342f640 R08: dffffc0000000000 R09: ffffed10057afd38
R10: ffffed10057afd39 R11: 1ffff110057afd38 R12: ffff88802bd7ea20
R13: 1ffff110057afd37 R14: 0000000000000001 R15: dffffc0000000001
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline]
rwsem_test_oflags kernel/locking/rwsem.c:157 [inline]
is_rwsem_reader_owned kernel/locking/rwsem.c:198 [inline]
__up_read+0x13a/0x660 kernel/locking/rwsem.c:1323
mmap_read_unlock include/linux/mmap_lock.h:144 [inline]
do_user_addr_fault+0x673/0xc80 arch/x86/mm/fault.c:1382
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8
RSP: 0018:ffffc9000342f7d0 EFLAGS: 00050206
RAX: ffffffff83d90c01 RBX: ffff88805dbf0000 RCX: 0000000000004c40
RDX: 0000000000008000 RSI: 0000200000043000 RDI: ffff88805dbf33c0
RBP: 000020000003fc40 R08: dffffc0000000000 R09: ffffed100bb7f000
R10: 0000000000000000 R11: 0000000000001000 R12: ffffc9000342fce0
R13: 0000200000047c40 R14: 00007ffffffff000 R15: 0000000000008000
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
copyin lib/iov_iter.c:168 [inline]
copy_page_from_iter_iovec lib/iov_iter.c:312 [inline]
copy_page_from_iter+0x425/0x760 lib/iov_iter.c:911
skb_copy_datagram_from_iter+0x2b6/0x6a0 net/core/datagram.c:587
unix_stream_sendmsg+0x66b/0xc80 net/unix/af_unix.c:2094
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
__sys_sendmsg net/socket.c:2519 [inline]
__do_sys_sendmsg net/socket.c:2528 [inline]
__se_sys_sendmsg+0x190/0x250 net/socket.c:2526
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f36f6b4bec9
Code: ff ff c3 66 2e 0f 1f 84 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 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f36f4db3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f36f6da2fa0 RCX: 00007f36f6b4bec9
RDX: 0000000000000003 RSI: 0000200000000980 RDI: 0000000000000005
RBP: 00007f36f6bcef91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36f6da3038 R14: 00007f36f6da2fa0 R15: 00007ffcc2e457c8
----------------
Code disassembly (best guess), 3 bytes skipped:
0: df 4f 8d fisttps -0x73(%rdi)
3: 0c 03 or $0x3,%al
5: 48 8d 5c 37 ff lea -0x1(%rdi,%rsi,1),%rbx
a: 48 c1 eb 03 shr $0x3,%rbx
e: 4e 8d 14 3b lea (%rbx,%r15,1),%r10
12: 4d 89 d6 mov %r10,%r14
15: 4d 29 ce sub %r9,%r14
18: 49 83 fe 10 cmp $0x10,%r14
1c: 7f 26 jg 0x44
1e: 4d 85 f6 test %r14,%r14
21: 0f 84 39 01 00 00 je 0x160
* 27: 48 f7 d3 not %rbx <-- trapping instruction
2a: 4c 01 db add %r11,%rbx
2d: 41 80 39 00 cmpb $0x0,(%r9)
31: 0f 85 c1 01 00 00 jne 0x1f8
37: 49 ff c1 inc %r9
3a: 48 ff c3 inc %rbx