rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2650 jiffies s: 3237 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4075 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0xe0/0x760 kernel/locking/lockdep.c:4296
Code: 48 c7 c0 e0 49 8c 8e 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 0b 05 00 00 83 3d dc 1e 4a 0d 00 75 6c 48 c7 44 24 40 00 00 00 00 9c <8f> 44 24 40 f6 44 24 41 02 0f 85 87 03 00 00 48 c7 c0 e0 49 8c 8e
RSP: 0018:ffffc90000198818 EFLAGS: 00000046
RAX: 0000000000000004 RBX: 1ffff92000033108 RCX: ffffffff8e8c4903
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff860e3d00
RBP: ffffc900001988e0 R08: dffffc0000000000 R09: ffffed103ec66ac2
R10: ffffed103ec66ac2 R11: 1ffff1103ec66ac1 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0d901d3880(0000) GS:ffff8881f6300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a3aeacfe8 CR3: 0000000132828000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x84/0x500 kernel/rcu/tree_plugin.h:685
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 7d 23 b8 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001989a0 EFLAGS: 00000206
RAX: 4d9f1a1f21b00300 RBX: 1ffff9200003313c RCX: 4d9f1a1f21b00300
RDX: dffffc0000000000 RSI: ffffffff84ea9440 RDI: ffffffff85056ee0
RBP: ffffc90000198aa0 R08: dffffc0000000000 R09: ffffed103ec66ac2
R10: ffffed103ec66ac2 R11: 1ffff1103ec66ac1 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8881f633a900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 process_backlog+0x351/0x610 net/core/dev.c:6024
 __napi_poll+0x8c/0x390 net/core/dev.c:6590
 napi_poll net/core/dev.c:6657 [inline]
 net_rx_action+0x531/0x9a0 net/core/dev.c:6771
 handle_softirqs+0x292/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x125/0x210 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:seqcount_lockdep_reader_access+0x127/0x170 include/linux/seqlock.h:105
Code: 12 12 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 45 41 f7 c4 00 02 00 00 74 01 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc9000237f9a0 EFLAGS: 00000206
RAX: 4d9f1a1f21b00300 RBX: ffffffff814f6076 RCX: 4d9f1a1f21b00300
RDX: dffffc0000000000 RSI: ffffffff84ea9440 RDI: ffffffff85056ee0
RBP: ffffc9000237fa40 R08: dffffc0000000000 R09: ffffed103ec66ac2
R10: ffffed103ec66ac2 R11: 1ffff1103ec66ac1 R12: 0000000000000a02
R13: ffff888116657138 R14: 1ffff9200046ff34 R15: dffffc0000000000
 ktime_get_coarse_real_ts64+0x56/0xe0 kernel/time/timekeeping.c:2261
 current_time+0x7b/0x200 fs/inode.c:2538
 atime_needs_update+0x258/0x4c0 fs/inode.c:1996
 touch_atime+0xcd/0x510 fs/inode.c:2013
 file_accessed include/linux/fs.h:2600 [inline]
 shmem_file_read_iter+0x168/0x780 mm/shmem.c:2723
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x58a/0x7c0 fs/read_write.c:470
 ksys_read+0xfc/0x1c0 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0d902c1407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc03dcd8d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f0d901d3880 RCX: 00007f0d902c1407
RDX: 0000000000001000 RSI: 0000557228651a00 RDI: 0000000000000009
RBP: 00007f0d90409ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007f0d90409ea0 R14: 0000000000000000 R15: 000055722865f5d0
 </TASK>