rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7677/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=41785, q=742 ncpus=2)
task:syz.0.403 state:R running task stack:23888 pid:7677 tgid:7675 ppid:7174 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
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_is_held_type+0x13b/0x190
Code: 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 42 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90004676e78 EFLAGS: 00000206
RAX: bcde8e8bf1377a00 RBX: 0000000000000000 RCX: 0000000080000000
RDX: ffff88802b4b1e00 RSI: ffffffff8beae6e0 RDI: ffffffff8c3f96c0
RBP: 0000000000000002 R08: ffffffff84929815 R09: 1ffffffff269e908
R10: dffffc0000000000 R11: fffffbfff269e909 R12: 0000000000000246
R13: ffff88802b4b1e00 R14: 00000000ffffffff R15: ffffffff8e738260
lock_is_held include/linux/lockdep.h:249 [inline]
rcu_read_lock_sched_held+0x8d/0x130 kernel/rcu/update.c:126
task_css include/linux/cgroup.h:433 [inline]
blkcg_css+0x6e/0x1d0 block/blk-cgroup.c:110
blk_cgroup_congested+0xbb/0x200 block/blk-cgroup.c:2189
__folio_throttle_swaprate+0x84/0x1d0 mm/swapfile.c:3742
folio_throttle_swaprate include/linux/swap.h:641 [inline]
shmem_add_to_page_cache+0x89c/0x1830 mm/shmem.c:796
shmem_alloc_and_add_folio+0x948/0x14f0 mm/shmem.c:1810
shmem_get_folio_gfp+0x8dc/0x2370 mm/shmem.c:2188
shmem_fault+0x252/0x6f0 mm/shmem.c:2388
__do_fault+0x135/0x460 mm/memory.c:4655
do_read_fault mm/memory.c:5061 [inline]
do_fault mm/memory.c:5191 [inline]
do_pte_missing mm/memory.c:3947 [inline]
handle_pte_fault+0x3b24/0x6eb0 mm/memory.c:5522
__handle_mm_fault mm/memory.c:5665 [inline]
handle_mm_fault+0xf70/0x1880 mm/memory.c:5833
faultin_page mm/gup.c:1194 [inline]
__get_user_pages+0x6ec/0x16a0 mm/gup.c:1493
populate_vma_page_range+0x264/0x330 mm/gup.c:1932
__mm_populate+0x27a/0x460 mm/gup.c:2035
mm_populate include/linux/mm.h:3415 [inline]
vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593
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: 0033:0x7fc660b79e79
RSP: 002b:00007fc6619fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fc660d15f80 RCX: 00007fc660b79e79
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fc660be7916 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc660d15f80 R15: 00007ffef7ae69d8
rcu: rcu_preempt kthread starved for 3948 jiffies! g41785 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:25168 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 7687 Comm: syz.2.402 Not tainted 6.11.0-rc3-syzkaller-00306-gdf6cbc62cc9b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70 kernel/kcov.c:221
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc90004857c38 EFLAGS: 00000246
RAX: ffffffff81329ebc RBX: 0000000000000000 RCX: ffff88807c559e00
RDX: ffffc900157e9000 RSI: 000000000003ffff RDI: ffffc90004857f58
RBP: ffffc90004857e30 R08: ffffffff8ff6c2af R09: 1ffffffff1fed855
R10: dffffc0000000000 R11: fffffbfff1fed856 R12: 00007f7b017bcb68
R13: ffffc90004857f58 R14: dffffc0000000000 R15: ffffc90004857ca0
FS: 00007f7b017bd6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b01f16138 CR3: 0000000070cc6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
restore_sigcontext+0x8c/0x7d0 arch/x86/kernel/signal_64.c:53
__do_sys_rt_sigreturn+0x17f/0x270 arch/x86/kernel/signal_64.c:263
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: 0033:0x7f7b01d157e9
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f7b017bcb40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f7b01f16138 RCX: 00007f7b01d157e9
RDX: 00007f7b017bcb40 RSI: 00007f7b017bcc70 RDI: 0000000000000011
RBP: 00007f7b01f16130 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7b01f1613c
R13: 0000000000000000 R14: 00007ffdbfd97df0 R15: 00007ffdbfd97ed8