------------[ cut here ]------------ WARNING: CPU: 1 PID: 31087 at kernel/bpf/helpers.c:712 try_get_fmt_tmp_buf kernel/bpf/helpers.c:712 [inline] WARNING: CPU: 1 PID: 31087 at kernel/bpf/helpers.c:712 bpf_bprintf_prepare+0xeba/0x10b0 kernel/bpf/helpers.c:760 Modules linked in: CPU: 1 PID: 31087 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:try_get_fmt_tmp_buf kernel/bpf/helpers.c:712 [inline] RIP: 0010:bpf_bprintf_prepare+0xeba/0x10b0 kernel/bpf/helpers.c:760 Code: c6 e8 6a ce 63 02 83 c0 01 48 98 48 01 c5 48 89 6c 24 08 e8 58 cc ec ff 8d 6b 02 83 44 24 10 01 e9 d6 f5 ff ff e8 46 cc ec ff <0f> 0b 65 ff 0d cd 08 7b 7e bf 01 00 00 00 41 bc f0 ff ff ff e8 1d RSP: 0018:ffffc90000dc0348 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000100 RDX: ffff88807a993880 RSI: ffffffff8187f66a RDI: 0000000000000003 RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8187f204 R11: 0000000000000000 R12: ffffc90000dc0478 R13: 0000000000000100 R14: ffffc90000dc0530 R15: 0000000000000003 FS: 0000000002806400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004e4da5 CR3: 0000000078d90000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ____bpf_trace_printk kernel/trace/bpf_trace.c:389 [inline] bpf_trace_printk+0xab/0x3a0 kernel/trace/bpf_trace.c:380 bpf_prog_0605f9f479290f07+0x2f/0x688 bpf_dispatcher_nop_func include/linux/bpf.h:687 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1788 [inline] bpf_trace_run2+0x12f/0x390 kernel/trace/bpf_trace.c:1825 __bpf_trace_net_dev_start_xmit+0xb1/0xe0 include/trace/events/tcp.h:238 trace_net_dev_start_xmit include/trace/events/net.h:14 [inline] xmit_one net/core/dev.c:3653 [inline] dev_hard_start_xmit+0x57b/0x920 net/core/dev.c:3670 __dev_queue_xmit+0x209c/0x2e30 net/core/dev.c:4245 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xeec/0x21f0 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x905/0x1a20 net/ipv4/ip_output.c:533 __tcp_transmit_skb+0x1889/0x38f0 net/ipv4/tcp_output.c:1405 __tcp_send_ack.part.0+0x3d6/0x7a0 net/ipv4/tcp_output.c:3970 __tcp_send_ack net/ipv4/tcp_output.c:3976 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3976 tcp_delack_timer_handler+0x4e4/0x6e0 net/ipv4/tcp_timer.c:317 tcp_delack_timer+0xa2/0x320 net/ipv4/tcp_timer.c:344 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191 Code: 74 24 10 e8 9a 17 41 f8 48 89 ef e8 32 90 41 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 63 98 35 f8 65 8b 05 7c a1 e8 76 85 c0 74 0a 5b 5d c3 e8 10 81 RSP: 0018:ffffc9000157fd80 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1b92621 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000001 RBP: ffffffff8bff5c80 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817acf98 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000293 R14: 1ffff9200019a006 R15: 0000000000000003 ____bpf_trace_printk kernel/trace/bpf_trace.c:398 [inline] bpf_trace_printk+0x172/0x3a0 kernel/trace/bpf_trace.c:380 bpf_prog_0605f9f479290f07+0x2f/0xaac bpf_dispatcher_nop_func include/linux/bpf.h:687 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1788 [inline] bpf_trace_run2+0x12f/0x390 kernel/trace/bpf_trace.c:1825 trace_sys_exit include/trace/events/syscalls.h:44 [inline] syscall_exit_work kernel/entry/common.c:252 [inline] syscall_exit_to_user_mode_prepare+0x1b4/0x260 kernel/entry/common.c:283 __syscall_exit_to_user_mode_work kernel/entry/common.c:288 [inline] syscall_exit_to_user_mode+0x9/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x48a7a1 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007ffc7c1d8250 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: 0000000000000000 RBX: 0000000000000083 RCX: 000000000048a7a1 RDX: 00007ffc7c1d8290 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffc7c1d832c R08: 0000000000000000 R09: 00007ffc7c1f5080 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 00000000000f0d4a R14: 000000000000000f R15: 00007ffc7c1d8390