syzbot

head: 05ffc00000000309 fffffdffc6628001 0080000000000000 0000000100000000
head: ffffffff00000000 0000000000000024 00000000ffffffff 0000000000000200
page dumped because: VM_BUG_ON_FOLIO(!pvmw.pte)
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kernel BUG at mm/rmap.c:1955!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 9503 Comm: syz-executor315 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : try_to_unmap_one+0x2c54/0x2d40 mm/rmap.c:1955
lr : try_to_unmap_one+0x2c54/0x2d40 mm/rmap.c:1955
sp : ffff80009e906380
x29: ffff80009e9065e0 x28: 0000000000000038
 x27: ffff0000c9dbee80
x26: fffffdffc6628018 x25: fffffdffc6628030 x24: dfff800000000000
x23: ffff0000d84efdc0 x22: ffff0000d84efde0 x21: 0000000000000001
x20: fffffdffc6628000 x19: 05ffc00000020849 x18: 00000000ffffffff
x17: 0000000000000000 x16: ffff80008adbe9e4 x15: 0000000000000001
x14: 1fffe0003386f2e2 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60003386f2e3 x10: 0000000000ff0100 x9 : 664e624a89365e00
x8 : 664e624a89365e00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80009e905a98 x4 : ffff80008f415ba0 x3 : ffff8000807b4b68
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 000000000000002f
Call trace:
 try_to_unmap_one+0x2c54/0x2d40 mm/rmap.c:1955 (P)
 rmap_walk_anon+0x47c/0x640 mm/rmap.c:2834
 rmap_walk+0x128/0x1e8 mm/rmap.c:2939
 try_to_unmap+0xc4/0x120 mm/rmap.c:2263
 unmap_poisoned_folio+0x278/0x4a4 mm/memory-failure.c:1610
 shrink_folio_list+0x608/0x4410 mm/vmscan.c:1131
 reclaim_folio_list+0xdc/0x5d0 mm/vmscan.c:2217
 reclaim_pages+0x420/0x544 mm/vmscan.c:2254
 madvise_cold_or_pageout_pte_range+0x1d38/0x20d4 mm/madvise.c:434
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:226 [inline]
 walk_p4d_range mm/pagewalk.c:264 [inline]
 walk_pgd_range+0xb4c/0x16bc mm/pagewalk.c:305
 __walk_page_range+0x13c/0x654 mm/pagewalk.c:412
 walk_page_range_mm+0x4fc/0x7dc mm/pagewalk.c:505
 walk_page_range+0x80/0x98 mm/pagewalk.c:584
 madvise_pageout_page_range mm/madvise.c:617 [inline]
 madvise_pageout mm/madvise.c:644 [inline]
 madvise_vma_behavior mm/madvise.c:1269 [inline]
 madvise_walk_vmas mm/madvise.c:1530 [inline]
 madvise_do_behavior+0x1940/0x2908 mm/madvise.c:1695
 do_madvise mm/madvise.c:1782 [inline]
 __do_sys_madvise mm/madvise.c:1790 [inline]
 __se_sys_madvise mm/madvise.c:1788 [inline]
 __arm64_sys_madvise+0x10c/0x154 mm/madvise.c:1788
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: f9404be0 b0051fc1 910c8021 97fdefe4 (d4210000) 
---[ end trace 0000000000000000 ]---