------------[ cut here ]------------
WARNING: CPU: 1 PID: 9895 at kernel/rcu/tree_stall.h:826 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:818
Modules linked in:
CPU: 1 PID: 9895 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:826
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 a0 c4 77 90 e8 4e 69 58 00 b8 01 00 00 00 87 05 13 8e 17 0f 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 f7 f7 8b 48 c7 c3 4c 70 c9 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000518e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100003724 RCX: ffffffff81603682
RDX: fffffbfff20ef894 RSI: 0000000000000004 RDI: ffffffff9077c4a0
RBP: ffffffff8bf7f7c0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20ef894 R11: 1ffff11005966cce R12: 1ffffffff1781e30
R13: 0000000000000246 R14: ffff88802cb36592 R15: 0000000000000001
FS:  00007fcf7e6ae700(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe50934a6c0 CR3: 000000004622a000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:789 [inline]
 rcu_core+0x4df/0x13b0 kernel/rcu/tree.c:2788
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:page_referenced_one+0x153/0x650 mm/rmap.c:805
Code: 83 b8 d8 05 00 00 00 0f 85 4d 01 00 00 e8 25 8d c7 ff 31 ff 44 89 e6 e8 6b 93 c7 ff 45 85 e4 74 36 e8 11 8d c7 ff 48 8b 04 24 <80> 38 00 0f 85 69 04 00 00 4c 8b 63 50 31 ff 41 81 e4 00 80 00 00
RSP: 0018:ffffc90001666ad8 EFLAGS: 00010246
RAX: ffffed1002c22812 RBX: ffff888016114040 RCX: ffffc90022814000
RDX: 0000000000040000 RSI: ffffffff81ac83bf RDI: 0000000000000003
RBP: ffffc90001666cc8 R08: 0000000000000000 R09: ffff888046823b4f
R10: ffffffff81ac83b5 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000769000 R15: 0000000000000000
 rmap_walk_file+0x567/0xca0 mm/rmap.c:1936
 rmap_walk+0x105/0x190 mm/rmap.c:1954
 page_referenced+0x3c6/0x4b0 mm/rmap.c:895
 page_check_references mm/vmscan.c:1187 [inline]
 shrink_page_list+0x2803/0x6060 mm/vmscan.c:1416
 shrink_inactive_list+0x347/0xca0 mm/vmscan.c:2145
 shrink_list mm/vmscan.c:2367 [inline]
 shrink_lruvec+0x7f9/0x14f0 mm/vmscan.c:2662
 shrink_node_memcgs mm/vmscan.c:2850 [inline]
 shrink_node+0x868/0x1de0 mm/vmscan.c:2967
 shrink_zones mm/vmscan.c:3170 [inline]
 do_try_to_free_pages+0x388/0x14b0 mm/vmscan.c:3225
 try_to_free_pages+0x29f/0x750 mm/vmscan.c:3464
 __perform_reclaim mm/page_alloc.c:4430 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4451 [inline]
 __alloc_pages_slowpath.constprop.0+0x84e/0x2140 mm/page_alloc.c:4855
 __alloc_pages+0x422/0x500 mm/page_alloc.c:5213
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
 __page_cache_alloc mm/filemap.c:1005 [inline]
 __page_cache_alloc+0x303/0x3a0 mm/filemap.c:990
 page_cache_ra_unbounded+0x348/0x920 mm/readahead.c:215
 do_page_cache_ra+0xf9/0x140 mm/readahead.c:267
 do_sync_mmap_readahead mm/filemap.c:2903 [inline]
 filemap_fault+0x160f/0x25b0 mm/filemap.c:2990
 ext4_filemap_fault+0x87/0xc0 fs/ext4/inode.c:6194
 __do_fault+0x10d/0x4d0 mm/memory.c:3680
 do_read_fault mm/memory.c:3984 [inline]
 do_fault mm/memory.c:4112 [inline]
 handle_pte_fault mm/memory.c:4371 [inline]
 __handle_mm_fault+0x2c5f/0x52c0 mm/memory.c:4506
 handle_mm_fault+0x1bc/0x7e0 mm/memory.c:4604
 do_user_addr_fault+0x483/0x1210 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
RIP: 0033:0x40dc04
Code: Unable to access opcode bytes at RIP 0x40dbda.
RSP: 002b:00007fcf7e6ae190 EFLAGS: 00010207
RAX: 0000000000000004 RBX: 000000000056c038 RCX: 00000000004665d9
RDX: fffffdffffffffff RSI: 0000000000000000 RDI: 000000002001d000
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffc34b0c3ef R14: 00007fcf7e6ae300 R15: 0000000000022000