rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21143/1:b..l P21139/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=145281, q=262 ncpus=2)
task:syz.0.3793 state:R running task stack:25456 pid:21139 tgid:21138 ppid:20391 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:236 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x1d/0x90 kernel/kcov.c:311
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 65 48 8b 0c 25 c0 d4 03 00 65 8b 05 b0 a7 6d 7e a9 00 01 ff 00 <74> 10 a9 00 01 00 00 74 57 83 b9 1c 16 00 00 00 74 4e 8b 81 f8 15
RSP: 0018:ffffc9000304f758 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000002 RCX: ffff88806c609e00
RDX: ffffc9000aa01000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: dffffc0000000000 R08: ffffffff8b81686e R09: 1ffffffff25f5ab0
R10: dffffc0000000000 R11: fffffbfff25f5ab1 R12: ffffc9000304f820
R13: 000000000000003c R14: ffff88805ef7cdc2 R15: ffff888069d42b28
xa_is_internal include/linux/xarray.h:175 [inline]
xa_is_sibling include/linux/xarray.h:1287 [inline]
xas_descend lib/xarray.c:210 [inline]
xas_load+0x1fe/0x5c0 lib/xarray.c:245
filemap_get_entry+0x1f0/0x3b0 mm/filemap.c:1840
shmem_get_folio_gfp+0x2a8/0x1f50 mm/shmem.c:1993
shmem_get_folio mm/shmem.c:2171 [inline]
shmem_write_begin+0x170/0x4d0 mm/shmem.c:2754
generic_perform_write+0x324/0x640 mm/filemap.c:4016
shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2930
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa74/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f356b57475f
RSP: 002b:00007f356c25de00 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f356b57475f
RDX: 0000000001000000 RSI: 00007f3561200000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000009915
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f356c25df00 R14: 00007f356c25dec0 R15: 00007f3561200000
task:syz.5.3794 state:R running task stack:25424 pid:21143 tgid:21142 ppid:16339 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 0a 84 89 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000c01f4a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92001803ea0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcaccc0 RDI: ffffffff8c202900
RBP: ffffc9000c01f600 R08: ffffffff92fad587 R09: 1ffffffff25f5ab0
R10: dffffc0000000000 R11: fffffbfff25f5ab1 R12: 1ffff92001803e9c
R13: dffffc0000000000 R14: ffffc9000c01f500 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
blk_cgroup_congested+0x3a/0x220 block/blk-cgroup.c:2188
__folio_throttle_swaprate+0x84/0x1d0 mm/swapfile.c:3695
folio_throttle_swaprate include/linux/swap.h:633 [inline]
shmem_add_to_page_cache+0x89c/0x1830 mm/shmem.c:789
shmem_alloc_and_add_folio+0x46c/0xdb0 mm/shmem.c:1700
shmem_get_folio_gfp+0x82d/0x1f50 mm/shmem.c:2066
shmem_get_folio mm/shmem.c:2171 [inline]
shmem_write_begin+0x170/0x4d0 mm/shmem.c:2754
generic_perform_write+0x324/0x640 mm/filemap.c:4016
shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2930
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa74/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f916a77475f
RSP: 002b:00007f916b4c8e00 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f916a77475f
RDX: 0000000001000000 RSI: 00007f9160400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000050f0
R10: 0000000020000342 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f916b4c8f00 R14: 00007f916b4c8ec0 R15: 00007f9160400000
rcu: rcu_preempt kthread starved for 9990 jiffies! g145281 f0x0 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:25232 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244