bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): done starting filesystem page: refcount:2 mapcount:0 mapping:0000000000000000 index:0xffff88801242ff80 pfn:0x1242f flags: 0xfff00000010001(locked|reclaim|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010001 ffffc9000d44e440 ffffc9000d44e440 ffffffff8c383cc2 raw: ffff88801242ff80 0000000000000002 00000002ffffffff 0000000000000000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12800(GFP_NOWAIT|__GFP_NORETRY), pid 81, tgid 81 (kswapd0), ts 85585199401, free_ts 85538861769 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:4740 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 z3fold_alloc mm/z3fold.c:1036 [inline] z3fold_zpool_malloc+0x3e5/0xd80 mm/z3fold.c:1388 zswap_compress mm/zswap.c:971 [inline] zswap_store_page mm/zswap.c:1462 [inline] zswap_store+0xe25/0x1c20 mm/zswap.c:1571 swap_writepage+0x647/0xce0 mm/page_io.c:278 pageout mm/vmscan.c:696 [inline] shrink_folio_list+0x35c2/0x5ac0 mm/vmscan.c:1402 evict_folios+0x45fd/0x56a0 mm/vmscan.c:4660 try_to_shrink_lruvec+0x713/0x9b0 mm/vmscan.c:4821 shrink_one+0x3b9/0x850 mm/vmscan.c:4866 shrink_many mm/vmscan.c:4929 [inline] lru_gen_shrink_node mm/vmscan.c:5007 [inline] shrink_node+0x379b/0x3e20 mm/vmscan.c:5978 kswapd_shrink_node mm/vmscan.c:6807 [inline] balance_pgdat mm/vmscan.c:6999 [inline] kswapd+0x20f3/0x3b10 mm/vmscan.c:7264 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 page last free pid 1061 tgid 1061 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 bch2_bio_free_pages_pool fs/bcachefs/io_write.c:104 [inline] bch2_write_endio+0x806/0xc60 fs/bcachefs/io_write.c:701 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:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 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 ------------[ cut here ]------------ kernel BUG at mm/z3fold.c:1293! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 Not tainted 6.14.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:z3fold_page_migrate+0xcf5/0x1240 mm/z3fold.c:1293 Code: ff 48 89 ef 48 c7 c6 60 3e 38 8c e8 05 12 d8 ff 90 0f 0b e8 cd 78 8d ff 48 8b 7c 24 10 48 c7 c6 c0 3e 38 8c e8 ec 11 d8 ff 90 <0f> 0b 48 85 db 0f 85 83 00 00 00 0f 1f 44 00 00 e8 a6 78 8d ff e9 RSP: 0018:ffffc9000d44deb8 EFLAGS: 00010246 RAX: e34e7da5ecdc1100 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c2ab380 RDI: 0000000000000001 RBP: ffffea0000490bc0 R08: ffffffff9454d957 R09: 1ffffffff28a9b2a R10: dffffc0000000000 R11: fffffbfff28a9b2b R12: dffffc0000000000 R13: ffffffff8c383cc8 R14: 00fff00000010001 R15: 1ffffd4000092178 FS: 00007f9e734896c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e73467df8 CR3: 00000000333a0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: move_to_new_folio+0x9a5/0xc20 mm/migrate.c:1069 migrate_folio_move mm/migrate.c:1358 [inline] migrate_folios_move mm/migrate.c:1710 [inline] migrate_pages_batch+0x1e84/0x30b0 mm/migrate.c:1957 migrate_pages_sync mm/migrate.c:2014 [inline] migrate_pages+0x2701/0x3680 mm/migrate.c:2096 compact_zone+0x33d5/0x4ae0 mm/compaction.c:2663 compact_zone_order mm/compaction.c:2798 [inline] try_to_compact_pages+0x5d4/0xce0 mm/compaction.c:2859 __alloc_pages_direct_compact+0x16e/0x580 mm/page_alloc.c:3685 __alloc_pages_slowpath+0x854/0x10b0 mm/page_alloc.c:4389 __alloc_frozen_pages_noprof+0x49b/0x710 mm/page_alloc.c:4753 __alloc_pages_noprof mm/page_alloc.c:4774 [inline] __folio_alloc_noprof+0x18/0x120 mm/page_alloc.c:4784 alloc_buddy_hugetlb_folio+0x108/0x5c0 mm/hugetlb.c:1955 alloc_fresh_hugetlb_folio+0x82/0x210 mm/hugetlb.c:2026 alloc_surplus_hugetlb_folio+0x105/0x2c0 mm/hugetlb.c:2248 alloc_buddy_hugetlb_folio_with_mpol mm/hugetlb.c:2323 [inline] alloc_hugetlb_folio+0xcee/0x1830 mm/hugetlb.c:3062 hugetlb_no_page mm/hugetlb.c:6176 [inline] hugetlb_fault+0x24f7/0x3360 mm/hugetlb.c:6417 handle_mm_fault+0x742/0x8d0 mm/memory.c:6198 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x173/0x2d0 mm/gup.c:2241 Code: 00 fc ff df 4c 89 e8 4f 8d ac 25 ff 0f 00 00 49 81 e5 00 f0 ff ff 49 39 c5 72 7a e8 47 b9 b4 ff 4c 39 eb 74 7d 4c 89 64 24 08 <44> 8a 23 43 0f b6 04 3e 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc9000d44f920 EFLAGS: 00050246 RAX: ffffffff820d26b5 RBX: 0000200000a00000 RCX: 0000000000100000 RDX: ffffc9000e25a000 RSI: 00000000000fffff RDI: 0000000000100000 RBP: ffffc9000d44f9d8 R08: ffffffff820d261c R09: ffffffff84f31fe9 R10: 0000000000000002 R11: ffff888000fb2440 R12: 0000000001fd2200 R13: 000020000208f000 R14: 1ffff92001a89f2c R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 bch2_buffered_write fs/bcachefs/fs-io-buffered.c:994 [inline] bch2_write_iter+0x538/0x2cd0 fs/bcachefs/fs-io-buffered.c:1065 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 RIP: 0033:0x7f9e7258d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e73489038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9e727a5fa0 RCX: 00007f9e7258d169 RDX: 000000000208e24b RSI: 0000200000000080 RDI: 0000000000000007 RBP: 00007f9e7260e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9e727a5fa0 R15: 00007ffc48885cd8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:z3fold_page_migrate+0xcf5/0x1240 mm/z3fold.c:1293 Code: ff 48 89 ef 48 c7 c6 60 3e 38 8c e8 05 12 d8 ff 90 0f 0b e8 cd 78 8d ff 48 8b 7c 24 10 48 c7 c6 c0 3e 38 8c e8 ec 11 d8 ff 90 <0f> 0b 48 85 db 0f 85 83 00 00 00 0f 1f 44 00 00 e8 a6 78 8d ff e9 RSP: 0018:ffffc9000d44deb8 EFLAGS: 00010246 RAX: e34e7da5ecdc1100 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c2ab380 RDI: 0000000000000001 RBP: ffffea0000490bc0 R08: ffffffff9454d957 R09: 1ffffffff28a9b2a R10: dffffc0000000000 R11: fffffbfff28a9b2b R12: dffffc0000000000 R13: ffffffff8c383cc8 R14: 00fff00000010001 R15: 1ffffd4000092178 FS: 00007f9e734896c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555567d997e0 CR3: 00000000333a0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 4c 89 e8 fisttps -0x18(%rcx,%rcx,4) 4: 4f 8d ac 25 ff 0f 00 lea 0xfff(%r13,%r12,1),%r13 b: 00 c: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13 13: 49 39 c5 cmp %rax,%r13 16: 72 7a jb 0x92 18: e8 47 b9 b4 ff call 0xffb4b964 1d: 4c 39 eb cmp %r13,%rbx 20: 74 7d je 0x9f 22: 4c 89 64 24 08 mov %r12,0x8(%rsp) * 27: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2a: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 2f: 84 c0 test %al,%al 31: 75 18 jne 0x4b 33: 44 88 64 24 40 mov %r12b,0x40(%rsp) 38: 48 rex.W 39: 81 .byte 0x81 3a: c3 ret 3b: 00 10 add %dl,(%rax)