INFO: rcu_tasks detected stalls on tasks:
ffff88802aef5dc0: .. nvcsw: 2/2 holdout: 1 idle_cpu: -1/0
task:syz.3.1336      state:R  running task     stack:26888 pid:13136 tgid:13134 ppid:10233  task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5521 [inline]
 __schedule+0x1b57/0x5bc0 kernel/sched/core.c:7272
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7594
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:check_kcov_mode kernel/kcov.c:190 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:242 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp1+0x52/0xb0 kernel/kcov.c:272
Code: 00 0f 41 81 f8 00 01 00 00 41 0f 95 c0 81 fa 00 00 00 10 0f 93 c2 44 08 c2 75 5b 83 b9 3c 17 00 00 00 74 52 8b 91 10 17 00 00 <83> fa 03 75 47 48 8b 91 18 17 00 00 44 8b 89 14 17 00 00 49 c1 e1
RSP: 0018:ffffc90009a3f958 EFLAGS: 00000246
RAX: ffffffff83c61ab1 RBX: ffff8880641aa4cb RCX: ffff88802aef5dc0
RDX: 0000000000000002 RSI: 000000000000002c RDI: 000000000000002c
RBP: ffffc90009a3fa70 R08: 0000000000000034 R09: 0000000000001b5b
R10: dffffc0000000000 R11: ffffed1009cf7d53 R12: 000000000000002c
R13: 0000000000000000 R14: 000000000000002c R15: ffff8880641aa4cd
 afs_parse_text_addrs+0x151/0xab0 fs/afs/addr_list.c:113
 afs_alloc_cell fs/afs/cell.c:181 [inline]
 afs_lookup_cell+0x10fe/0x1c80 fs/afs/cell.c:273
 afs_proc_cells_write+0x242/0x310 fs/afs/proc.c:125
 proc_simple_write+0x10c/0x140 fs/proc/generic.c:843
 pde_write fs/proc/inode.c:330 [inline]
 proc_reg_write+0x1e9/0x2e0 fs/proc/inode.c:342
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65eff9e0d9
RSP: 002b:00007f65f0e1e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f65f0225fa0 RCX: 00007f65eff9e0d9
RDX: 000000000000000d RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007f65f0035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f65f0226038 R14: 00007f65f0225fa0 R15: 00007ffd7e2e1138
 </TASK>