rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10507 ticks this GP) idle=f05/1/0x4000000000000000 softirq=244913/244915 fqs=0
(t=10501 jiffies g=395577 q=8)
rcu: rcu_preempt kthread starved for 10502 jiffies! g395577 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28688 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4984 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6265
schedule+0xd2/0x260 kernel/sched/core.c:6338
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1579 Comm: syz-executor.1 Not tainted 5.15.0-next-20211106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode+0x2c/0x40 kernel/kcov.c:177
Code: 05 59 a9 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 ac 15 00 00 85 d2 74 0b 8b 86 88 15 00 00 <39> f8 0f 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0
RSP: 0018:ffffc9000ab37c30 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 000000001f200bcf RCX: 000000001f200bcf
RDX: 0000000000000000 RSI: ffff8880219bd7c0 RDI: 0000000000000003
RBP: ffffc9000ab37de8 R08: 0000000000000007 R09: ffffffff87b8822a
R10: ffffffff87b881d4 R11: 0000000000000000 R12: ffff88808d9de000
R13: 0000000000000000 R14: 0000000020dff5d0 R15: 0000000000000000
FS: 00007fbd0c77e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020c00000 CR3: 000000007877c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
write_comp_data kernel/kcov.c:221 [inline]
__sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:287
tcp_repair_options_est net/ipv4/tcp.c:3110 [inline]
do_tcp_setsockopt net/ipv4/tcp.c:3505 [inline]
tcp_setsockopt+0x1f74/0x2520 net/ipv4/tcp.c:3655
__sys_setsockopt+0x2db/0x610 net/socket.c:2176
__do_sys_setsockopt net/socket.c:2187 [inline]
__se_sys_setsockopt net/socket.c:2184 [inline]
__x64_sys_setsockopt+0xba/0x150 net/socket.c:2184
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fbd0f208ae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbd0c77e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fbd0f31bf60 RCX: 00007fbd0f208ae9
RDX: 0000000000000016 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007fbd0f262f25 R08: 000000002000019f R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe6cc5d47f R14: 00007fbd0c77e300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 1580 Comm: syz-executor.3 Not tainted 5.15.0-next-20211106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:copy_user_generic_unrolled+0xb1/0xc0 arch/x86/lib/copy_user_64.S:108
Code: 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 88 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 01 cb 83 fa 08 72
RSP: 0018:ffffc9000aaffc08 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000020cbac60 RDI: ffffc9000aaffcc8
RBP: ffffc9000aaffcc0 R08: 0000000000000000 R09: ffffc9000aaffcc7
R10: fffff5200155ff98 R11: 0000000000000000 R12: 0000000020cbac60
R13: 0000000020cbac58 R14: 0000000000000000 R15: 0000000000000000
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]
_copy_from_user+0xf4/0x180 lib/usercopy.c:16
copy_from_user include/linux/uaccess.h:192 [inline]
copy_from_sockptr_offset include/linux/sockptr.h:48 [inline]
tcp_repair_options_est net/ipv4/tcp.c:3111 [inline]
do_tcp_setsockopt net/ipv4/tcp.c:3505 [inline]
tcp_setsockopt+0x20e2/0x2520 net/ipv4/tcp.c:3655
__sys_setsockopt+0x2db/0x610 net/socket.c:2176
__do_sys_setsockopt net/socket.c:2187 [inline]
__se_sys_setsockopt net/socket.c:2184 [inline]
__x64_sys_setsockopt+0xba/0x150 net/socket.c:2184
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f2db0296ae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2dad80c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f2db03a9f60 RCX: 00007f2db0296ae9
RDX: 0000000000000016 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007f2db02f0f25 R08: 000000002000019f R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7de9f14f R14: 00007f2dad80c300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 05 59 a9 8a 7e add $0x7e8aa959,%eax
5: 89 c2 mov %eax,%edx
7: 81 e2 00 01 00 00 and $0x100,%edx
d: a9 00 01 ff 00 test $0xff0100,%eax
12: 74 10 je 0x24
14: 31 c0 xor %eax,%eax
16: 85 d2 test %edx,%edx
18: 74 15 je 0x2f
1a: 8b 96 ac 15 00 00 mov 0x15ac(%rsi),%edx
20: 85 d2 test %edx,%edx
22: 74 0b je 0x2f
24: 8b 86 88 15 00 00 mov 0x1588(%rsi),%eax
* 2a: 39 f8 cmp %edi,%eax <-- trapping instruction
2c: 0f 94 c0 sete %al
2f: c3 retq
30: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
37: 00 00 00 00
3b: 0f 1f 00 nopl (%rax)
3e: 31 c0 xor %eax,%eax