Hello, syzbot found the following issue on: HEAD commit: 69b54314c975 Merge tag 'kbuild-fixes-v6.14' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1643abdf980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1909f2f0d8e641ce dashboard link: https://syzkaller.appspot.com/bug?extid=29566bbfe6b64b944865 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-69b54314.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e32e396b49c9/vmlinux-69b54314.xz kernel image: https://storage.googleapis.com/syzbot-assets/30d7fe7e4148/bzImage-69b54314.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+29566bbfe6b64b944865@xxxxxxxxxxxxxxxxxxxxxxxxx page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54600 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea000134ad48 ffffea0001518048 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x153c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE|__GFP_WRITE), pid 5324, tgid 5323 (syz.0.0), ts 71600359556, free_ts 71965749654 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2361 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2371 filemap_alloc_folio_noprof+0xe1/0x540 mm/filemap.c:1019 __filemap_get_folio+0x438/0xae0 mm/filemap.c:1970 iomap_get_folio fs/iomap/buffered-io.c:608 [inline] __iomap_get_folio fs/iomap/buffered-io.c:754 [inline] iomap_write_begin+0x4d3/0x1990 fs/iomap/buffered-io.c:797 iomap_write_iter fs/iomap/buffered-io.c:955 [inline] iomap_file_buffered_write+0x6ea/0x11c0 fs/iomap/buffered-io.c:1039 xfs_file_buffered_write+0x2cd/0xb20 fs/xfs/xfs_file.c:792 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5324 tgid 5323 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xe40/0x18b0 mm/page_alloc.c:2707 folios_put_refs+0x76c/0x860 mm/swap.c:994 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0xe65/0x10e0 mm/truncate.c:387 xfs_flush_unmap_range+0xb8/0xd0 fs/xfs/xfs_bmap_util.c:820 xfs_reflink_remap_prep+0x5fe/0x720 xfs_file_remap_range+0x287/0x910 fs/xfs/xfs_file.c:1210 vfs_copy_file_range+0xc07/0x14f0 fs/read_write.c:1584 __do_sys_copy_file_range fs/read_write.c:1670 [inline] __se_sys_copy_file_range+0x3fa/0x600 fs/read_write.c:1637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at ./include/linux/mm.h:1153! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 1037 Comm: kworker/u4:7 Not tainted 6.14.0-rc1-syzkaller-00276-g69b54314c975 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: loop0 loop_workfn RIP: 0010:put_page_testzero include/linux/mm.h:1153 [inline] RIP: 0010:folio_put_testzero include/linux/mm.h:1159 [inline] RIP: 0010:folio_put include/linux/mm.h:1488 [inline] RIP: 0010:folio_end_writeback+0x603/0x650 mm/filemap.c:1655 Code: 45 c7 ff 4c 89 ef 48 c7 c6 60 d7 13 8c e8 a5 5a 11 00 90 0f 0b e8 4d 45 c7 ff 4c 89 ef 48 c7 c6 a0 d6 13 8c e8 8e 5a 11 00 90 <0f> 0b e8 36 45 c7 ff 4c 89 ef 48 c7 c6 e0 d3 13 8c e8 77 5a 11 00 RSP: 0018:ffffc900025bf430 EFLAGS: 00010246 RAX: 4a021b16b8d5f700 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: dffffc0000000000 R08: ffffffff942f994f R09: 1ffffffff285f329 R10: dffffc0000000000 R11: fffffbfff285f32a R12: 0000000000000000 R13: ffffea0001518000 R14: 1ffffd40002a3000 R15: ffffea0001518034 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000000040 CR3: 00000000124d6000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> iomap_finish_folio_write fs/iomap/buffered-io.c:1533 [inline] iomap_finish_ioend+0x462/0x6b0 fs/iomap/buffered-io.c:1561 blk_update_request+0x5e5/0x1160 block/blk-mq.c:983 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1145 loop_handle_cmd drivers/block/loop.c:1946 [inline] loop_process_work+0x1bc8/0x21c0 drivers/block/loop.c:1964 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:put_page_testzero include/linux/mm.h:1153 [inline] RIP: 0010:folio_put_testzero include/linux/mm.h:1159 [inline] RIP: 0010:folio_put include/linux/mm.h:1488 [inline] RIP: 0010:folio_end_writeback+0x603/0x650 mm/filemap.c:1655 Code: 45 c7 ff 4c 89 ef 48 c7 c6 60 d7 13 8c e8 a5 5a 11 00 90 0f 0b e8 4d 45 c7 ff 4c 89 ef 48 c7 c6 a0 d6 13 8c e8 8e 5a 11 00 90 <0f> 0b e8 36 45 c7 ff 4c 89 ef 48 c7 c6 e0 d3 13 8c e8 77 5a 11 00 RSP: 0018:ffffc900025bf430 EFLAGS: 00010246 RAX: 4a021b16b8d5f700 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: dffffc0000000000 R08: ffffffff942f994f R09: 1ffffffff285f329 R10: dffffc0000000000 R11: fffffbfff285f32a R12: 0000000000000000 R13: ffffea0001518000 R14: 1ffffd40002a3000 R15: ffffea0001518034 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000000040 CR3: 00000000124d6000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. 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