rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=3bd/1/0x4000000000000000 softirq=18497/18497 fqs=0 
	(detected by 1, t=10502 jiffies, g=17881, q=1493)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9720 Comm: syz.3.2438 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:irqentry_exit_cond_resched+0x7/0x30 kernel/entry/common.c:392
Code: e8 9b 7e c1 c1 1b 0f 31 0f b6 c0 31 c8 65 89 05 bf e8 9b 7e e9 04 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 65 8b 05 f1 42 9c 7e <a9> ff ff ff 7f 75 1a e8 1d 7f fd ff 65 48 8b 05 d5 42 9c 7e 48 f7
RSP: 0000:ffffc9000d1a7168 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 855c2a66d408de00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000d1a7178
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1027fd3c81
R10: ffffed1027fd3c81 R11: 1ffff11027fd3c80 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  000055556327c500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce63fff CR3: 0000000023085000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0000:ffffc9000d1a7220 EFLAGS: 00000206
RAX: 855c2a66d408de00 RBX: 1ffff92001a34e48 RCX: 855c2a66d408de00
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc9000d1a7300 R08: dffffc0000000000 R09: fffffbfff1ff5437
R10: fffffbfff1ff5437 R11: 1ffffffff1ff5436 R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 mod_objcg_mlstate+0x225/0x2d0 mm/memcontrol.c:832
 drain_obj_stock+0x1ec/0x370 mm/memcontrol.c:3203
 refill_obj_stock+0x121/0x440 mm/memcontrol.c:3242
 memcg_slab_free_hook+0x157/0x1f0 mm/slab.h:364
 do_slab_free mm/slub.c:3437 [inline]
 ___cache_free+0x63/0x120 mm/slub.c:3511
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
 kmem_cache_zalloc include/linux/slab.h:728 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1597 [inline]
 new_handle fs/jbd2/transaction.c:477 [inline]
 jbd2__journal_start+0x13c/0x5a0 fs/jbd2/transaction.c:504
 __ext4_journal_start_sb+0x167/0x360 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x8b/0x100 fs/ext4/inode.c:6051
 __mark_inode_dirty+0x2c8/0xc90 fs/fs-writeback.c:2474
 generic_update_time+0x1cd/0x1f0 fs/inode.c:1881
 inode_update_time fs/inode.c:1894 [inline]
 file_update_time+0x38b/0x400 fs/inode.c:2083
 ext4_page_mkwrite+0x1b4/0x1240 fs/ext4/inode.c:6172
 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922
 do_shared_fault mm/memory.c:4328 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1d48/0x43b0 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f681e331411
Code: b5 7a ff ff 48 8b 05 66 43 eb 00 0f b6 4c 24 10 be 08 00 00 00 48 89 df 83 05 42 43 eb 00 01 48 8d 50 ff 48 89 15 47 43 eb 00 <88> 48 ff 8b 2d 2e 43 eb 00 e8 81 7a ff ff 48 8b 05 3a 43 eb 00 41
RSP: 002b:00007ffe58ece990 EFLAGS: 00010202
RAX: 0000001b2ce64000 RBX: 00007f681f1e5720 RCX: 0000000000000003
RDX: 0000001b2ce63fff RSI: 0000000000000008 RDI: 00007f681f1e5720
RBP: 00007f681e6b6038 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f681f1e5700 R11: 0000000000000001 R12: 0000000000006803
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g17881 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=22525
rcu: rcu_preempt kthread starved for 10502 jiffies! g17881 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27808 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
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: 9720 Comm: syz.3.2438 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:91 [inline]
RIP: 0010:lock_is_held_type+0x3d/0x190 kernel/locking/lockdep.c:5659
Code: 28 00 00 00 48 89 44 24 08 bd ff ff ff ff 83 3d 6c 7f c7 03 00 0f 84 03 01 00 00 65 8b 05 5b 8f 60 76 85 c0 0f 85 f4 00 00 00 <65> 48 8b 1d cb 85 60 76 83 bb ec 0a 00 00 00 0f 85 df 00 00 00 41
RSP: 0000:ffffc9000d1a6a50 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b9035120 RCX: 855c2a66d408de00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c11c720
RBP: 00000000ffffffff R08: dffffc0000000000 R09: ffffc9000d1a6c00
R10: fffff52001a34d87 R11: 1ffff92001a34d80 R12: dffffc0000000000
R13: ffffc9000d1a6c66 R14: ffffffff8bf23a40 R15: dffffc0000000000
FS:  000055556327c500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce63fff CR3: 0000000023085000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 perf_get_guest_cbs include/linux/perf_event.h:1274 [inline]
 perf_misc_flags+0x56/0x1b0 arch/x86/events/core.c:2961
 perf_prepare_sample+0x132/0x1cb0 kernel/events/core.c:7622
 __perf_event_output kernel/events/core.c:7802 [inline]
 perf_event_output_forward+0x146/0x280 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0000:ffffc9000d1a7220 EFLAGS: 00000206
RAX: 855c2a66d408de00 RBX: 1ffff92001a34e48 RCX: 855c2a66d408de00
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc9000d1a7300 R08: dffffc0000000000 R09: fffffbfff1ff5437
R10: fffffbfff1ff5437 R11: 1ffffffff1ff5436 R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 mod_objcg_mlstate+0x225/0x2d0 mm/memcontrol.c:832
 drain_obj_stock+0x1ec/0x370 mm/memcontrol.c:3203
 refill_obj_stock+0x121/0x440 mm/memcontrol.c:3242
 memcg_slab_free_hook+0x157/0x1f0 mm/slab.h:364
 do_slab_free mm/slub.c:3437 [inline]
 ___cache_free+0x63/0x120 mm/slub.c:3511
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
 kmem_cache_zalloc include/linux/slab.h:728 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1597 [inline]
 new_handle fs/jbd2/transaction.c:477 [inline]
 jbd2__journal_start+0x13c/0x5a0 fs/jbd2/transaction.c:504
 __ext4_journal_start_sb+0x167/0x360 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x8b/0x100 fs/ext4/inode.c:6051
 __mark_inode_dirty+0x2c8/0xc90 fs/fs-writeback.c:2474
 generic_update_time+0x1cd/0x1f0 fs/inode.c:1881
 inode_update_time fs/inode.c:1894 [inline]
 file_update_time+0x38b/0x400 fs/inode.c:2083
 ext4_page_mkwrite+0x1b4/0x1240 fs/ext4/inode.c:6172
 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922
 do_shared_fault mm/memory.c:4328 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1d48/0x43b0 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f681e331411
Code: b5 7a ff ff 48 8b 05 66 43 eb 00 0f b6 4c 24 10 be 08 00 00 00 48 89 df 83 05 42 43 eb 00 01 48 8d 50 ff 48 89 15 47 43 eb 00 <88> 48 ff 8b 2d 2e 43 eb 00 e8 81 7a ff ff 48 8b 05 3a 43 eb 00 41
RSP: 002b:00007ffe58ece990 EFLAGS: 00010202
RAX: 0000001b2ce64000 RBX: 00007f681f1e5720 RCX: 0000000000000003
RDX: 0000001b2ce63fff RSI: 0000000000000008 RDI: 00007f681f1e5720
RBP: 00007f681e6b6038 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f681f1e5700 R11: 0000000000000001 R12: 0000000000006803
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>