================================================================== BUG: KASAN: stack-out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118 Read of size 8 at addr ffffc900024e7a30 by task kworker/0:1/23089 CPU: 0 PID: 23089 Comm: kworker/0:1 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events iterate_cleanup_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 csd_lock_record+0xcb/0xe0 kernel/smp.c:118 flush_smp_call_function_queue+0x285/0x730 kernel/smp.c:391 __sysvec_call_function_single+0x98/0x490 arch/x86/kernel/smp.c:248 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_call_function_single+0xe0/0x120 arch/x86/kernel/smp.c:243 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__local_bh_enable_ip+0x189/0x250 kernel/softirq.c:196 Code: 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c4 00 00 00 48 83 3d 40 59 6e 08 00 74 7b fb 66 0f 1f 44 00 00 <65> 8b 05 a0 58 bb 7e 85 c0 74 6b 5b 5d 41 5c c3 80 3d c1 7c 63 09 RSP: 0018:ffffc9000733fba8 EFLAGS: 00000286 RAX: 1ffffffff1369fe2 RBX: 0000000000000200 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff8146a5a9 RBP: ffffffff8673d367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888093bf2340 R13: 00000000000049a5 R14: 0000000000000000 R15: 0000000000000001 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2236 [inline] nf_ct_iterate_cleanup+0x9e/0x330 net/netfilter/nf_conntrack_core.c:2259 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2344 [inline] nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2329 iterate_cleanup_work+0x45/0x130 net/netfilter/nf_nat_masquerade.c:216 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Memory state around the buggy address: ffffc900024e7900: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 ffffc900024e7980: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 >ffffc900024e7a00: 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 ^ ffffc900024e7a80: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900024e7b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================