------------[ cut here ]------------
WARNING: CPU: 1 PID: 32736 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 32736 Comm: syz.3.9077 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 4d 97 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 d0 93 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:ffffc90000dcfce8 EFLAGS: 00010246
RAX: ffffffff81a068e0 RBX: 0000000000000000 RCX: ffff888028571dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000dd0117 R09: ffffc90000dd00e4
R10: dffffc0000000000 R11: fffff520001ba023 R12: ffff888028573548
R13: ffffc9000112c030 R14: ffffc90000dcfd48 R15: 0000000000000000
FS: 00007f42478276c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f335294d000 CR3: 000000001b1ac000 CR4: 00000000003506e0
DR0: 0000200000000300 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+0x32/0xd1c
bpf_dispatcher_nop_func include/linux/bpf.h:889 [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+0x12b/0x3e0 net/core/flow_dissector.c:896
__skb_flow_dissect+0x7cc/0x6180 net/core/flow_dissector.c:1029
skb_flow_dissect_flow_keys include/linux/skbuff.h:1390 [inline]
___skb_get_hash+0x55/0x680 net/core/flow_dissector.c:1638
__skb_get_hash+0xd2/0x270 net/core/flow_dissector.c:1703
skb_get_hash include/linux/skbuff.h:1432 [inline]
skb_tx_hash net/core/dev.c:3256 [inline]
netdev_pick_tx+0x335/0xad0 net/core/dev.c:4153
netdev_core_pick_tx+0x141/0x300 net/core/dev.c:4186
__dev_queue_xmit+0x797/0x2e50 net/core/dev.c:4261
neigh_output include/net/neighbour.h:509 [inline]
ip6_finish_output2+0x108b/0x1530 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+0xb7a/0x1410 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3966
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:lock_is_held_type+0x4c/0x190 kernel/locking/lockdep.c:5659
Code: 3d 6c 2a cb 03 00 0f 84 03 01 00 00 65 8b 05 1b 62 42 76 85 c0 0f 85 f4 00 00 00 65 48 8b 1d 8b 58 42 76 83 bb ec 0a 00 00 00 <0f> 85 df 00 00 00 41 89 f7 49 89 fe 48 c7 04 24 00 00 00 00 9c 8f
RSP: 0018:ffffc900030aecc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888028571dc0 RCX: ffff888028571dc0
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c344878
RBP: 00000000ffffffff R08: dffffc0000000000 R09: 1ffffffff203dc18
R10: dffffc0000000000 R11: fffffbfff203dc19 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8880629f1000 R15: ffff888028571dc0
lock_is_held include/linux/lockdep.h:287 [inline]
task_css include/linux/cgroup.h:496 [inline]
blk_cgroup_congested include/linux/blk-cgroup.h:283 [inline]
__cgroup_throttle_swaprate+0x1a2/0x530 mm/swapfile.c:3809
cgroup_throttle_swaprate include/linux/swap.h:728 [inline]
shmem_add_to_page_cache+0xb7e/0x14d0 mm/shmem.c:727
shmem_getpage_gfp+0x1735/0x2c10 mm/shmem.c:1940
shmem_getpage mm/shmem.c:151 [inline]
shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
__generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
__kernel_write+0x522/0x980 fs/read_write.c:539
__dump_emit+0x258/0x380 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2fe0/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x14e8/0x2a40 fs/coredump.c:894
get_signal+0x531/0x12e0 kernel/signal.c:2895
arch_do_signal_or_restart+0xe6/0x12a0 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:1499
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x2000
Code: Unable to access opcode bytes at RIP 0x1fd6.
RSP: 002b:00002000000000b8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4249856fa0 RCX: 00007f42495cf0d9
RDX: 0000000000000000 RSI: 00002000000000b0 RDI: 0000000000200000
RBP: 00007f4249666024 R08: 0000200000000140 R09: 0000200000000140
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f4249857038 R14: 00007f4249856fa0 R15: 00007ffe8eea8f38
----------------
Code disassembly (best guess):
0: 3d 6c 2a cb 03 cmp $0x3cb2a6c,%eax
5: 00 0f add %cl,(%rdi)
7: 84 03 test %al,(%rbx)
9: 01 00 add %eax,(%rax)
b: 00 65 8b add %ah,-0x75(%rbp)
e: 05 1b 62 42 76 add $0x7642621b,%eax
13: 85 c0 test %eax,%eax
15: 0f 85 f4 00 00 00 jne 0x10f
1b: 65 48 8b 1d 8b 58 42 mov %gs:0x7642588b(%rip),%rbx # 0x764258ae
22: 76
23: 83 bb ec 0a 00 00 00 cmpl $0x0,0xaec(%rbx)
* 2a: 0f 85 df 00 00 00 jne 0x10f <-- trapping instruction
30: 41 89 f7 mov %esi,%r15d
33: 49 89 fe mov %rdi,%r14
36: 48 c7 04 24 00 00 00 movq $0x0,(%rsp)
3d: 00
3e: 9c pushf
3f: 8f .byte 0x8f