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Message-ID: <68148f31.050a0220.14dd7d.0021.GAE@google.com> Date: Fri, 02 May 2025 02:24:01 -0700 From: syzbot <syzbot+7b3842775c9ce6b69efc@...kaller.appspotmail.com> To: hdanton@...a.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [mm?] BUG: Bad page state in page_cache_ra_order Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: Bad page state in page_cache_ra_order BUG: Bad page state in process syz.0.16 pfn:4ae01 page does not match folio page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x4ae01 ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea00012b8000 00000000ffffffff ffffffffffffffff raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: nonzero pincount page_owner tracks the page as allocated page last allocated via order 9, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6528, tgid 6528 (syz.0.16), ts 96978401088, free_ts 60314976314 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_pages_noprof mm/mempolicy.c:2392 [inline] folio_alloc_noprof+0x20/0x2d0 mm/mempolicy.c:2402 filemap_alloc_folio_noprof+0x3a1/0x470 mm/filemap.c:1007 ractl_alloc_folio mm/readahead.c:186 [inline] ra_alloc_folio mm/readahead.c:441 [inline] page_cache_ra_order+0x4c0/0xd00 mm/readahead.c:509 do_sync_mmap_readahead mm/filemap.c:3225 [inline] filemap_fault+0x1a5e/0x2740 mm/filemap.c:3403 __do_fault+0x10a/0x490 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x1a6/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 6017 tgid 6017 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725 vfree+0x176/0x960 mm/vmalloc.c:3383 kcov_put kernel/kcov.c:439 [inline] kcov_put kernel/kcov.c:435 [inline] kcov_close+0x34/0x60 kernel/kcov.c:535 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xafb/0x2c30 kernel/exit.c:953 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Modules linked in: CPU: 1 UID: 0 PID: 6529 Comm: syz.0.16 Not tainted 6.15.0-rc4-syzkaller-gebd297a2affa-dirty #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 bad_page+0xb3/0x1f0 mm/page_alloc.c:505 free_tail_page_prepare+0x44f/0x5b0 mm/page_alloc.c:1000 free_pages_prepare mm/page_alloc.c:1238 [inline] __free_frozen_pages+0x96a/0xff0 mm/page_alloc.c:2725 __folio_put+0x329/0x450 mm/swap.c:112 folio_put_refs include/linux/mm.h:1600 [inline] filemap_free_folio+0x132/0x170 mm/filemap.c:235 delete_from_page_cache_batch+0x741/0x9b0 mm/filemap.c:339 truncate_inode_pages_range+0x279/0xe30 mm/truncate.c:376 blkdev_flush_mapping+0xe9/0x280 block/bdev.c:717 blkdev_put_whole+0xc4/0xf0 block/bdev.c:726 bdev_release+0x47e/0x6d0 block/bdev.c:1151 blkdev_release+0x15/0x20 block/fops.c:660 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xafb/0x2c30 kernel/exit.c:953 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f62ebd8e969 Code: Unable to access opcode bytes at 0x7f62ebd8e93f. RSP: 002b:00007f62eccc30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f62ebfb5fa8 RCX: 00007f62ebd8e969 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f62ebfb5fa8 RBP: 00007f62ebfb5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f62ebfb5fac R13: 0000000000000000 R14: 00007ffdd5f711a0 R15: 00007ffdd5f71288 </TASK> BUG: Bad page state in process syz.0.16 pfn:4ae00 page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ae00 head: order:0 mapcount:0 entire_mapcount:1 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000049(locked|uptodate|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000049 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 head: 00fff00000000049 dead000000000100 dead000000000122 0000000000000000 head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 head: 00fff00000000000 0000000000000000 00000000ffffffff 0000000000000000 head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set page_owner tracks the page as allocated page last allocated via order 9, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6528, tgid 6528 (syz.0.16), ts 96978401088, free_ts 60314965608 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_pages_noprof mm/mempolicy.c:2392 [inline] folio_alloc_noprof+0x20/0x2d0 mm/mempolicy.c:2402 filemap_alloc_folio_noprof+0x3a1/0x470 mm/filemap.c:1007 ractl_alloc_folio mm/readahead.c:186 [inline] ra_alloc_folio mm/readahead.c:441 [inline] page_cache_ra_order+0x4c0/0xd00 mm/readahead.c:509 do_sync_mmap_readahead mm/filemap.c:3225 [inline] filemap_fault+0x1a5e/0x2740 mm/filemap.c:3403 __do_fault+0x10a/0x490 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x1a6/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 6017 tgid 6017 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725 vfree+0x176/0x960 mm/vmalloc.c:3383 kcov_put kernel/kcov.c:439 [inline] kcov_put kernel/kcov.c:435 [inline] kcov_close+0x34/0x60 kernel/kcov.c:535 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xafb/0x2c30 kernel/exit.c:953 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Modules linked in: CPU: 2 UID: 0 PID: 6529 Comm: syz.0.16 Tainted: G B 6.15.0-rc4-syzkaller-gebd297a2affa-dirty #0 PREEMPT(full) Tainted: [B]=BAD_PAGE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 bad_page+0xb3/0x1f0 mm/page_alloc.c:505 free_page_is_bad_report mm/page_alloc.c:938 [inline] free_page_is_bad mm/page_alloc.c:948 [inline] free_pages_prepare mm/page_alloc.c:1254 [inline] __free_frozen_pages+0x76e/0xff0 mm/page_alloc.c:2725 __folio_put+0x329/0x450 mm/swap.c:112 folio_put_refs include/linux/mm.h:1600 [inline] filemap_free_folio+0x132/0x170 mm/filemap.c:235 delete_from_page_cache_batch+0x741/0x9b0 mm/filemap.c:339 truncate_inode_pages_range+0x279/0xe30 mm/truncate.c:376 blkdev_flush_mapping+0xe9/0x280 block/bdev.c:717 blkdev_put_whole+0xc4/0xf0 block/bdev.c:726 bdev_release+0x47e/0x6d0 block/bdev.c:1151 blkdev_release+0x15/0x20 block/fops.c:660 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xafb/0x2c30 kernel/exit.c:953 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f62ebd8e969 Code: Unable to access opcode bytes at 0x7f62ebd8e93f. RSP: 002b:00007f62eccc30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f62ebfb5fa8 RCX: 00007f62ebd8e969 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f62ebfb5fa8 RBP: 00007f62ebfb5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f62ebfb5fac R13: 0000000000000000 R14: 00007ffdd5f711a0 R15: 00007ffdd5f71288 </TASK> Tested on: commit: ebd297a2 Merge tag 'net-6.15-rc5' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=142de774580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ca17f2d2ba38f7a0 dashboard link: https://syzkaller.appspot.com/bug?extid=7b3842775c9ce6b69efc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=10f21f74580000
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