rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 0, t=10502 jiffies, g=91985, q=53)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295019550-4295009048), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g91985 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:28416 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4986 [inline]
__schedule+0xab2/0x4e90 kernel/sched/core.c:6296
schedule+0xd2/0x260 kernel/sched/core.c:6369
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1971
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2144
kthread+0x2e9/0x3a0 kernel/kthread.c:377
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8981 Comm: syz-executor.3 Not tainted 5.16.0-rc6-next-20211224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x2/0x5470 kernel/locking/lockdep.c:4885
Code: 66 00 eb b6 48 c7 c7 28 65 93 8d e8 98 91 66 00 e9 46 ff ff ff 48 c7 c7 28 65 93 8d e8 87 91 66 00 e9 58 fe ff ff 66 90 41 57 <41> 89 cf 41 56 49 89 fe 41 55 41 54 41 89 f4 55 89 d5 53 48 81 ec
RSP: 0018:ffffc90000dc0ad0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff920001b8162 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8bba2888
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1b2663a R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8bba2888 R15: 0000000000000000
FS: 00007ffbd9d17700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e736000 CR3: 000000007b3b8000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000b8fecd19 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire kernel/locking/lockdep.c:5639 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604
seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline]
timekeeping_get_delta kernel/time/timekeeping.c:252 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:386 [inline]
ktime_get+0x147/0x470 kernel/time/timekeeping.c:829
hrtimer_forward_now include/linux/hrtimer.h:506 [inline]
perf_swevent_hrtimer+0x246/0x3f0 kernel/events/core.c:10626
__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:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:200
Code: 00 00 e9 76 c8 70 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 39 6b 8a 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 00 70 02 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc9000766f500 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000001000 RCX: 0000000080000000
RDX: 0000000003193000 RSI: ffffffff821afe99 RDI: ffff888071661900
RBP: ffff8880293bde80 R08: 0000000000001000 R09: ffffea00022f8500
R10: ffffffff83e7b2c8 R11: 0000000000000000 R12: 0000000000001000
R13: ffffea00022f8500 R14: 0000000003193000 R15: ffffc9000766fa58
ext4_da_write_end+0x29/0x990 fs/ext4/inode.c:3024
generic_perform_write+0x2c6/0x510 mm/filemap.c:3820
ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
call_write_iter include/linux/fs.h:2079 [inline]
do_iter_readv_writev+0x47a/0x750 fs/read_write.c:725
do_iter_write+0x188/0x710 fs/read_write.c:851
vfs_iter_write+0x70/0xa0 fs/read_write.c:892
iter_file_splice_write+0x723/0xc70 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0x110/0x180 fs/splice.c:936
splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64 fs/read_write.c:1296 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
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: 0033:0x7ffbdb3a1e99
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:00007ffbd9d17168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffbdb4b4f60 RCX: 00007ffbdb3a1e99
RDX: 0000000000000000 RSI: 000000000000000e RDI: 0000000000000005
RBP: 00007ffbdb3fbff1 R08: 0000000000000000 R09: 0000000000000000
R10: 00008400fffffffb R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffec9b520ff R14: 00007ffbd9d17300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 66 00 eb data16 add %ch,%bl
3: b6 48 mov $0x48,%dh
5: c7 c7 28 65 93 8d mov $0x8d936528,%edi
b: e8 98 91 66 00 callq 0x6691a8
10: e9 46 ff ff ff jmpq 0xffffff5b
15: 48 c7 c7 28 65 93 8d mov $0xffffffff8d936528,%rdi
1c: e8 87 91 66 00 callq 0x6691a8
21: e9 58 fe ff ff jmpq 0xfffffe7e
26: 66 90 xchg %ax,%ax
28: 41 57 push %r15
* 2a: 41 89 cf mov %ecx,%r15d <-- trapping instruction
2d: 41 56 push %r14
2f: 49 89 fe mov %rdi,%r14
32: 41 55 push %r13
34: 41 54 push %r12
36: 41 89 f4 mov %esi,%r12d
39: 55 push %rbp
3a: 89 d5 mov %edx,%ebp
3c: 53 push %rbx
3d: 48 rex.W
3e: 81 .byte 0x81
3f: ec in (%dx),%al