syzbot

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-...D } 2672 jiffies s: 3041 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: 4377 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
RIP: 0010:__lock_acquire+0xdb4/0x7c50 kernel/locking/lockdep.c:5019
Code: ff df 42 0f b6 04 00 84 c0 0f 85 a6 5b 00 00 83 3d 40 dc 39 15 00 48 8b 84 24 a8 00 00 00 75 34 48 63 d8 48 89 d8 48 c1 e8 06 <48> 8d 3c c5 40 82 8c 90 be 08 00 00 00 e8 8a fd 6d 00 49 b8 00 00
RSP: 0018:ffffc900001e08e0 EFLAGS: 00000047
RAX: 0000000000000000 RBX: 000000000000002c RCX: ffffffff969cf103
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff908c8240
RBP: ffffc900001e0b30 R08: dffffc0000000000 R09: fffffbfff2119049
R10: fffffbfff2119049 R11: 1ffffffff2119048 R12: ffff888025770000
R13: ffff888025770b02 R14: ffff888025770b30 R15: ffff888025770b50
FS:  00007fcd0cea2880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd0cea0000 CR3: 0000000029661000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 advance_sched+0x6e8/0x970 net/sched/sch_taprio.c:753
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x554/0xd60 kernel/time/hrtimer.c:1811
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/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:vma_start_pgoff mm/interval_tree.c:15 [inline]
RIP: 0010:avc_start_pgoff mm/interval_tree.c:63 [inline]
RIP: 0010:anon_vma_interval_tree_verify+0x50/0x140 mm/interval_tree.c:108
Code: 42 80 3c 20 00 74 05 e8 8e 28 16 00 4c 8b 73 40 49 89 dd 49 c1 ed 03 43 80 7c 25 00 00 74 08 48 89 df e8 73 28 16 00 4c 8b 3b <49> 83 c7 68 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8
RSP: 0018:ffffc900033979b0 EFLAGS: 00000246
RAX: 1ffff1100fc3994a RBX: ffff88807e1cca10 RCX: ffff888025770000
RDX: 0000000000000000 RSI: 0000000000000035 RDI: ffff88807e1cca50
RBP: ffffc90003397ad0 R08: dffffc0000000000 R09: ffffed1005c880ad
R10: ffffed1005c880ad R11: 1ffff11005c880ac R12: dffffc0000000000
R13: 1ffff1100fc39942 R14: 0000000000000035 R15: ffff888027b84a20
 validate_mm+0x175/0x2b0 mm/mmap.c:342
 mmap_region+0x780/0x1c70 mm/mmap.c:2922
 do_mmap+0x958/0xfd0 mm/mmap.c:1436
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
 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: 0033:0x7fcd0c71d822
Code: 00 00 00 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 3b 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 76 5b 5d c3 0f 1f 00 48 8b 05 a1 35 0d 00 64
RSP: 002b:00007fff19b5dfd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcd0c71d822
RDX: 0000000000000003 RSI: 0000000000000200 RDI: 0000000000000000
RBP: 0000000000000022 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000200 R14: 0000558a0388e0b0 R15: 0000000000003e00
 </TASK>