------------[ cut here ]------------
WARNING: CPU: 1 PID: 7199 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 7199 Comm: syz.1.775 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:ffffc90000dcfe88 EFLAGS: 00010246
RAX: ffffffff81a06db0 RBX: 0000000000000000 RCX: ffff888020220000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000dd02b7 R09: ffffc90000dd0284
R10: dffffc0000000000 R11: fffff520001ba057 R12: ffff888020221788
R13: ffffc90000e56030 R14: ffffc90000dcfee8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68e7b92e9c CR3: 0000000072445000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000200000000300 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+0x32/0xc2c
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
hsr_xmit net/hsr/hsr_forward.c:340 [inline]
hsr_forward_do net/hsr/hsr_forward.c:431 [inline]
hsr_forward_skb+0xf82/0x16b0 net/hsr/hsr_forward.c:584
send_hsr_supervision_frame+0x5f7/0xb90 net/hsr/hsr_device.c:349
hsr_announce+0x168/0x310 net/hsr/hsr_device.c:405
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:free_unref_page_list+0x7ad/0x830 mm/page_alloc.c:3479
Code: 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 42 c6 44 28 08 f8 75 53 f7 c3 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <48> 8b 44 24 08 4a c7 04 28 00 00 00 00 4a c7 44 28 08 00 00 00 00
RSP: 0018:ffffc90003a0f160 EFLAGS: 00000206
RAX: 1ffff92000741e34 RBX: 0000000000000246 RCX: 24c225e147a5c000
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: ffffc90003a0f290 R08: ffffffff8d8b0def R09: 1ffffffff1b161bd
R10: dffffc0000000000 R11: fffffbfff1b161be R12: ffffc90003a0f320
R13: dffffc0000000000 R14: ffffffff8be3d828 R15: ffffc90003a0f320
release_pages+0x185f/0x1bd0 mm/swap.c:963
__pagevec_release+0x6d/0xe0 mm/swap.c:983
pagevec_release include/linux/pagevec.h:81 [inline]
shmem_undo_range+0x5cd/0x19a0 mm/shmem.c:964
shmem_truncate_range mm/shmem.c:1063 [inline]
shmem_evict_inode+0x1e2/0x9a0 mm/shmem.c:1145
evict+0x4b6/0x8b0 fs/inode.c:647
__dentry_kill+0x412/0x630 fs/dcache.c:586
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xd8/0x1a0 fs/dcache.c:893
__fput+0x5a5/0x8c0 fs/file_table.c:319
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x635/0x2110 kernel/exit.c:884
do_group_exit+0x12c/0x2f0 kernel/exit.c:998
get_signal+0x7eb/0x12e0 kernel/signal.c:2901
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_general_protection+0x1e4/0x270 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:600
RIP: 0033:0x7f34e5e28ea1
Code: Unable to access opcode bytes at RIP 0x7f34e5e28e77.
RSP: 002b:0000200000000330 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f34e60b0fa0 RCX: 00007f34e5e28e99
RDX: 0000200000000380 RSI: 0000200000000330 RDI: 0000000023002000
RBP: 00007f34e5ebeeaf R08: 0000200000000500 R09: 0000200000000500
R10: 00002000000003c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f34e60b1038 R14: 00007f34e60b0fa0 R15: 00007ffcffa50558
----------------
Code disassembly (best guess):
0: 24 80 and $0x80,%al
2: 00 00 add %al,(%rax)
4: 00 f7 add %dh,%bh
6: 84 24 80 test %ah,(%rax,%rax,4)
9: 00 00 add %al,(%rax)
b: 00 00 add %al,(%rax)
d: 02 00 add (%rax),%al
f: 00 42 c6 add %al,-0x3a(%rdx)
12: 44 28 08 sub %r9b,(%rax)
15: f8 clc
16: 75 53 jne 0x6b
18: f7 c3 00 02 00 00 test $0x200,%ebx
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp)
28: e0 45
* 2a: 48 8b 44 24 08 mov 0x8(%rsp),%rax <-- trapping instruction
2f: 4a c7 04 28 00 00 00 movq $0x0,(%rax,%r13,1)
36: 00
37: 4a c7 44 28 08 00 00 movq $0x0,0x8(%rax,%r13,1)
3e: 00 00