rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=ac3/1/0x4000000000000000 softirq=228197/228198 fqs=37
(t=10502 jiffies g=427985 q=519)
rcu: rcu_preempt kthread starved for 10426 jiffies! g427985 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:28672 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4953 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6234
schedule+0xd2/0x260 kernel/sched/core.c:6307
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
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: 9852 Comm: syz-executor.2 Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:200
Code: 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 <83> f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48
RSP: 0018:ffffc90016327920 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888085d69d00 RSI: ffffffff890a2478 RDI: 0000000000000003
RBP: ffff888037d80000 R08: 0000000000001fff R09: 0000000000000002
R10: ffffffff890a246a R11: 0000000000000000 R12: 000000000e0734e6
R13: dffffc0000000000 R14: ffff888086688000 R15: ffff88808163b818
FS: 00007f58bee97700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f58bee75d58 CR3: 0000000018de5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__io_uring_show_fdinfo fs/io_uring.c:10079 [inline]
io_uring_show_fdinfo+0x3a1/0x1372 fs/io_uring.c:10164
seq_show+0x58d/0x800 fs/proc/fd.c:68
seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
seq_read+0x3e0/0x5b0 fs/seq_file.c:162
do_loop_readv_writev fs/read_write.c:750 [inline]
do_loop_readv_writev fs/read_write.c:737 [inline]
do_iter_read+0x501/0x760 fs/read_write.c:792
vfs_readv+0xe5/0x150 fs/read_write.c:910
do_preadv fs/read_write.c:1002 [inline]
__do_sys_preadv fs/read_write.c:1052 [inline]
__se_sys_preadv fs/read_write.c:1047 [inline]
__x64_sys_preadv+0x231/0x310 fs/read_write.c:1047
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: 0033:0x7f58c19628d9
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:00007f58bee97188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f58c1a670e0 RCX: 00007f58c19628d9
RDX: 0000000000000333 RSI: 00000000200017c0 RDI: 0000000000000006
RBP: 00007f58c19bccb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffef2939edf R14: 00007f58bee97300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 9848 Comm: syz-executor.2 Not tainted 5.15.0-rc4-next-20211008-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:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3889 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608
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:1428
__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:__sanitizer_cov_trace_cmp8+0x0/0x70 kernel/kcov.c:266
Code: fe 72 22 44 89 c6 48 83 c2 01 48 89 4c 38 f0 48 c7 44 38 e0 04 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 c3 0f 1f 40 00 <49> 89 f8 bf 03 00 00 00 4c 8b 14 24 48 89 f1 65 48 8b 34 25 40 70
RSP: 0018:ffffc900167f7818 EFLAGS: 00000246
RAX: ffff8880774b9de8 RBX: ffff8880774b9de0 RCX: 1ffff1100ee973bd
RDX: dffffc0000000000 RSI: 0000000000004000 RDI: 0000000000004000
RBP: ffffc900167f7910 R08: 00000000ffffffff R09: 0000000000000002
R10: ffffffff890a246a R11: 0000000000000000 R12: 1ffff92002cfef07
R13: 0000000000004000 R14: 0000000000004000 R15: ffff8880774b9df8
seq_vprintf fs/seq_file.c:390 [inline]
seq_printf+0x105/0x240 fs/seq_file.c:406
__io_uring_show_fdinfo fs/io_uring.c:10081 [inline]
io_uring_show_fdinfo+0x47f/0x1372 fs/io_uring.c:10164
seq_show+0x58d/0x800 fs/proc/fd.c:68
seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
seq_read+0x3e0/0x5b0 fs/seq_file.c:162
do_loop_readv_writev fs/read_write.c:750 [inline]
do_loop_readv_writev fs/read_write.c:737 [inline]
do_iter_read+0x501/0x760 fs/read_write.c:792
vfs_readv+0xe5/0x150 fs/read_write.c:910
do_preadv fs/read_write.c:1002 [inline]
__do_sys_preadv fs/read_write.c:1052 [inline]
__se_sys_preadv fs/read_write.c:1047 [inline]
__x64_sys_preadv+0x231/0x310 fs/read_write.c:1047
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: 0033:0x7f58c19628d9
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:00007f58beed9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f58c1a66f60 RCX: 00007f58c19628d9
RDX: 0000000000000333 RSI: 00000000200017c0 RDI: 0000000000000006
RBP: 00007f58c19bccb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffef2939edf R14: 00007f58beed9300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 81 e1 00 01 00 00 and $0x100,%ecx
6: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx
d: 02 00
f: a9 00 01 ff 00 test $0xff0100,%eax
14: 74 0e je 0x24
16: 85 c9 test %ecx,%ecx
18: 74 35 je 0x4f
1a: 8b 82 ac 15 00 00 mov 0x15ac(%rdx),%eax
20: 85 c0 test %eax,%eax
22: 74 2b je 0x4f
24: 8b 82 88 15 00 00 mov 0x1588(%rdx),%eax
* 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction
2d: 75 20 jne 0x4f
2f: 48 8b 8a 90 15 00 00 mov 0x1590(%rdx),%rcx
36: 8b 92 8c 15 00 00 mov 0x158c(%rdx),%edx
3c: 48 8b 01 mov (%rcx),%rax
3f: 48 rex.W