Message-ID: <0000000000001c22650604f85b41@google.com>
Date:   Sat, 09 Sep 2023 19:56:27 -0700
From:   syzbot <syzbot+55cc72f8cc3a549119df@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] BUG: Bad page map (7)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: Bad page map

BUG: Bad page map in process syz-executor.0  pte:fffff9a91c120 pmd:7ef9e067
page:ffffea000195b8c0 refcount:9 mapcount:-1 mapping:ffff888075b15190 index:0x3 pfn:0x656e3
head:ffffea000195b800 order:2 entire_mapcount:0 nr_pages_mapped:8388607 pincount:0
memcg:ffff888023d52000
aops:xfs_address_space_operations ino:244a dentry name:"bus"
flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea000195b801 dead000000000122 dead000000000400
raw: 0000000000000001 0000000000000000 00000000fffffffe 0000000000000000
head: 00fff0000000816c ffffea0001b3b948 ffff8880142af030 ffff888075b15190
head: 0000000000000000 ffff8880295fbc80 00000009ffffffff ffff888023d52000
page dumped because: bad pte
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5456, tgid 5455 (syz-executor.0), ts 78822082874, free_ts 15468294632
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976
 ra_alloc_folio mm/readahead.c:468 [inline]
 page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524
 do_sync_mmap_readahead+0x444/0x850
 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291
 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354
 __do_fault+0x133/0x4e0 mm/memory.c:4204
 do_read_fault mm/memory.c:4568 [inline]
 do_fault mm/memory.c:4705 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239
 __get_user_pages_locked mm/gup.c:1504 [inline]
 get_dump_page+0x146/0x2b0 mm/gup.c:2018
 dump_user_range+0x126/0x910 fs/coredump.c:913
 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142
 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405
 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342
 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x23d/0x7d0 init/main.c:1232
 do_initcall_level+0x157/0x210 init/main.c:1294
 do_initcalls+0x3f/0x80 init/main.c:1310
 kernel_init_freeable+0x440/0x5d0 init/main.c:1547
 kernel_init+0x1d/0x2a0 init/main.c:1437
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
addr:0000000020006000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff888075b15190 index:5
file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio
CPU: 0 PID: 5456 Comm: syz-executor.0 Not tainted 6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_bad_pte+0x581/0x5c0 mm/memory.c:535
 zap_pte_range mm/memory.c:1458 [inline]
 zap_pmd_range mm/memory.c:1573 [inline]
 zap_pud_range mm/memory.c:1602 [inline]
 zap_p4d_range mm/memory.c:1623 [inline]
 unmap_page_range+0x1a76/0x3300 mm/memory.c:1644
 unmap_vmas+0x209/0x3a0 mm/memory.c:1731
 exit_mmap+0x297/0xc50 mm/mmap.c:3210
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x612/0x2290 kernel/exit.c:861
 do_group_exit+0x206/0x2c0 kernel/exit.c:1024
 get_signal+0x175d/0x1840 kernel/signal.c:2892
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f766007cae9
Code: Unable to access opcode bytes at 0x7f766007cabf.
RSP: 002b:00007f7660d270c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffe5 RBX: 00007f766019bf80 RCX: 00007f766007cae9
RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007
RBP: 00007f76600c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f766019bf80 R15: 00007fff3bbb47b8
 </TASK>
BUG: Bad page map in process syz-executor.0  pte:fffff9a91d120 pmd:7ef9e067
page:ffffea000195b880 refcount:9 mapcount:-1 mapping:ffff888075b15190 index:0x2 pfn:0x656e2
head:ffffea000195b800 order:2 entire_mapcount:0 nr_pages_mapped:8388606 pincount:0
memcg:ffff888023d52000
aops:xfs_address_space_operations ino:244a dentry name:"bus"
flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea000195b801 ffffea000195b890 ffffea000195b890
raw: 0000000000000001 0000000000000000 00000000fffffffe 0000000000000000
head: 00fff0000000816c ffffea0001b3b948 ffff8880142af030 ffff888075b15190
head: 0000000000000000 ffff8880295fbc80 00000009ffffffff ffff888023d52000
page dumped because: bad pte
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5456, tgid 5455 (syz-executor.0), ts 78822082874, free_ts 15468288757
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976
 ra_alloc_folio mm/readahead.c:468 [inline]
 page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524
 do_sync_mmap_readahead+0x444/0x850
 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291
 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354
 __do_fault+0x133/0x4e0 mm/memory.c:4204
 do_read_fault mm/memory.c:4568 [inline]
 do_fault mm/memory.c:4705 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239
 __get_user_pages_locked mm/gup.c:1504 [inline]
 get_dump_page+0x146/0x2b0 mm/gup.c:2018
 dump_user_range+0x126/0x910 fs/coredump.c:913
 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142
 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405
 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342
 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x23d/0x7d0 init/main.c:1232
 do_initcall_level+0x157/0x210 init/main.c:1294
 do_initcalls+0x3f/0x80 init/main.c:1310
 kernel_init_freeable+0x440/0x5d0 init/main.c:1547
 kernel_init+0x1d/0x2a0 init/main.c:1437
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
addr:0000000020007000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff888075b15190 index:6
file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio
CPU: 1 PID: 5456 Comm: syz-executor.0 Tainted: G    B              6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_bad_pte+0x581/0x5c0 mm/memory.c:535
 zap_pte_range mm/memory.c:1458 [inline]
 zap_pmd_range mm/memory.c:1573 [inline]
 zap_pud_range mm/memory.c:1602 [inline]
 zap_p4d_range mm/memory.c:1623 [inline]
 unmap_page_range+0x1a76/0x3300 mm/memory.c:1644
 unmap_vmas+0x209/0x3a0 mm/memory.c:1731
 exit_mmap+0x297/0xc50 mm/mmap.c:3210
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x612/0x2290 kernel/exit.c:861
 do_group_exit+0x206/0x2c0 kernel/exit.c:1024
 get_signal+0x175d/0x1840 kernel/signal.c:2892
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f766007cae9
Code: Unable to access opcode bytes at 0x7f766007cabf.
RSP: 002b:00007f7660d270c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffe5 RBX: 00007f766019bf80 RCX: 00007f766007cae9
RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007
RBP: 00007f76600c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f766019bf80 R15: 00007fff3bbb47b8
 </TASK>
BUG: Bad page map in process syz-executor.0  pte:fffff9a91e120 pmd:7ef9e067
page:ffffea000195b840 refcount:9 mapcount:-1 mapping:ffff888075b15190 index:0x1 pfn:0x656e1
head:ffffea000195b800 order:2 entire_mapcount:0 nr_pages_mapped:8388605 pincount:0
memcg:ffff888023d52000
aops:xfs_address_space_operations ino:244a dentry name:"bus"
flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000202 ffffea000195b801 dead000000000122 fffffffdffffffff
raw: 0000000400000000 0000000000000000 00000000fffffffe 0000000000000000
head: 00fff0000000816c ffffea0001b3b948 ffff8880142af030 ffff888075b15190
head: 0000000000000000 ffff8880295fbc80 00000009ffffffff ffff888023d52000
page dumped because: bad pte
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5456, tgid 5455 (syz-executor.0), ts 78822082874, free_ts 15468282901
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976
 ra_alloc_folio mm/readahead.c:468 [inline]
 page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524
 do_sync_mmap_readahead+0x444/0x850
 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291
 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354
 __do_fault+0x133/0x4e0 mm/memory.c:4204
 do_read_fault mm/memory.c:4568 [inline]
 do_fault mm/memory.c:4705 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239
 __get_user_pages_locked mm/gup.c:1504 [inline]
 get_dump_page+0x146/0x2b0 mm/gup.c:2018
 dump_user_range+0x126/0x910 fs/coredump.c:913
 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142
 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405
 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342
 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x23d/0x7d0 init/main.c:1232
 do_initcall_level+0x157/0x210 init/main.c:1294
 do_initcalls+0x3f/0x80 init/main.c:1310
 kernel_init_freeable+0x440/0x5d0 init/main.c:1547
 kernel_init+0x1d/0x2a0 init/main.c:1437
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
addr:0000000020008000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff888075b15190 index:7
file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio
CPU: 0 PID: 5456 Comm: syz-executor.0 Tainted: G    B              6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_bad_pte+0x581/0x5c0 mm/memory.c:535
 zap_pte_range mm/memory.c:1458 [inline]
 zap_pmd_range mm/memory.c:1573 [inline]
 zap_pud_range mm/memory.c:1602 [inline]
 zap_p4d_range mm/memory.c:1623 [inline]
 unmap_page_range+0x1a76/0x3300 mm/memory.c:1644
 unmap_vmas+0x209/0x3a0 mm/memory.c:1731
 exit_mmap+0x297/0xc50 mm/mmap.c:3210
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x612/0x2290 kernel/exit.c:861
 do_group_exit+0x206/0x2c0 kernel/exit.c:1024
 get_signal+0x175d/0x1840 kernel/signal.c:2892
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f766007cae9
Code: Unable to access opcode bytes at 0x7f766007cabf.
RSP: 002b:00007f7660d270c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffe5 RBX: 00007f766019bf80 RCX: 00007f766007cae9
RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007
RBP: 00007f76600c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f766019bf80 R15: 00007fff3bbb47b8
 </TASK>


Tested on:

commit:         a3c57ab7 iov_iter: Kunit tests for page extraction
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1264dfec680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=50ac7dadde9e1c0e
dashboard link: https://syzkaller.appspot.com/bug?extid=55cc72f8cc3a549119df
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10734fafa80000

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