On Fri, Dec 13, 2024 at 9:18 AM syzbot <syzbot+4c7590f1cee06597e43a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: f932fb9b4074 Merge tag 'v6.13-rc2-ksmbd-server-fixes' of g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=101e24f8580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fee25f93665c89ac > dashboard link: https://syzkaller.appspot.com/bug?extid=4c7590f1cee06597e43a > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14654730580000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-f932fb9b.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/1982926f01cf/vmlinux-f932fb9b.xz > kernel image: https://storage.googleapis.com/syzbot-assets/56ef2ef1e465/bzImage-f932fb9b.xz > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/7e9b5cd91eeb/mount_0.gz > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/87ff98e190e4/mount_1.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+4c7590f1cee06597e43a@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] > BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] > BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:269 [inline] > BUG: KASAN: slab-use-after-free in folio_evictable+0xe3/0x250 mm/internal.h:435 > Read of size 8 at addr ffff88804e4813a0 by task kswapd1/81 This doesn't seem like an MM bug -- folio_evictable() should be safe to use on a folio as long as it's on LRU, i.e., after it's exposed on LRU and before page_cache_release() finishes. There might have been a dangling folio_mappping()? > CPU: 0 UID: 0 PID: 81 Comm: kswapd1 Not tainted 6.13.0-rc2-syzkaller-00159-gf932fb9b4074 #0 > 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+0x241/0x360 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:378 [inline] > print_report+0x169/0x550 mm/kasan/report.c:489 > kasan_report+0x143/0x180 mm/kasan/report.c:602 > kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 > instrument_atomic_read include/linux/instrumented.h:68 [inline] > _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] > mapping_unevictable include/linux/pagemap.h:269 [inline] > folio_evictable+0xe3/0x250 mm/internal.h:435 > sort_folio mm/vmscan.c:4299 [inline] > scan_folios mm/vmscan.c:4424 [inline] > isolate_folios mm/vmscan.c:4550 [inline] > evict_folios+0xff2/0x5800 mm/vmscan.c:4581 > try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789 > shrink_one+0x3b9/0x850 mm/vmscan.c:4834 > shrink_many mm/vmscan.c:4897 [inline] > lru_gen_shrink_node mm/vmscan.c:4975 [inline] > shrink_node+0x37c5/0x3e50 mm/vmscan.c:5956 > kswapd_shrink_node mm/vmscan.c:6785 [inline] > balance_pgdat mm/vmscan.c:6977 [inline] > kswapd+0x1ca9/0x36f0 mm/vmscan.c:7246 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > </TASK> > > Allocated by task 5580: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > unpoison_slab_object mm/kasan/common.c:319 [inline] > __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 > kasan_slab_alloc include/linux/kasan.h:250 [inline] > slab_post_alloc_hook mm/slub.c:4104 [inline] > slab_alloc_node mm/slub.c:4153 [inline] > kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4160 > gfs2_glock_get+0x309/0x1010 fs/gfs2/glock.c:1178 > gfs2_inode_lookup+0x2a3/0xc90 fs/gfs2/inode.c:135 > gfs2_dir_search+0x229/0x2f0 fs/gfs2/dir.c:1667 > gfs2_lookupi+0x461/0x5e0 fs/gfs2/inode.c:340 > gfs2_jindex_hold fs/gfs2/ops_fstype.c:587 [inline] > init_journal+0x5fa/0x2410 fs/gfs2/ops_fstype.c:729 > init_inodes+0xdc/0x320 fs/gfs2/ops_fstype.c:864 > gfs2_fill_super+0x1bd1/0x24d0 fs/gfs2/ops_fstype.c:1249 > get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 > gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 > vfs_get_tree+0x90/0x2b0 fs/super.c:1814 > do_new_mount+0x2be/0xb40 fs/namespace.c:3507 > do_mount fs/namespace.c:3847 [inline] > __do_sys_mount fs/namespace.c:4057 [inline] > __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 > 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 > > Freed by task 16: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 > kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 > poison_slab_object mm/kasan/common.c:247 [inline] > __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 > kasan_slab_free include/linux/kasan.h:233 [inline] > slab_free_hook mm/slub.c:2338 [inline] > slab_free mm/slub.c:4598 [inline] > kmem_cache_free+0x195/0x410 mm/slub.c:4700 > rcu_do_batch kernel/rcu/tree.c:2567 [inline] > rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 > handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 > run_ksoftirqd+0xca/0x130 kernel/softirq.c:950 > smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > Last potentially related work creation: > kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 > __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544 > __call_rcu_common kernel/rcu/tree.c:3086 [inline] > call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 > __gfs2_glock_free+0xda0/0xef0 fs/gfs2/glock.c:172 > gfs2_glock_free+0x3c/0xb0 fs/gfs2/glock.c:178 > gfs2_glock_put_eventually fs/gfs2/super.c:1257 [inline] > gfs2_evict_inode+0x6e2/0x13c0 fs/gfs2/super.c:1546 > evict+0x4e8/0x9a0 fs/inode.c:796 > gfs2_jindex_free+0x3f6/0x4b0 fs/gfs2/super.c:79 > init_journal+0x9fb/0x2410 fs/gfs2/ops_fstype.c:846 > init_inodes+0xdc/0x320 fs/gfs2/ops_fstype.c:864 > gfs2_fill_super+0x1bd1/0x24d0 fs/gfs2/ops_fstype.c:1249 > get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 > gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 > vfs_get_tree+0x90/0x2b0 fs/super.c:1814 > do_new_mount+0x2be/0xb40 fs/namespace.c:3507 > do_mount fs/namespace.c:3847 [inline] > __do_sys_mount fs/namespace.c:4057 [inline] > __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 > 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 > > Second to last potentially related work creation: > kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 > __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544 > insert_work+0x3e/0x330 kernel/workqueue.c:2183 > __queue_work+0xc8b/0xf50 kernel/workqueue.c:2339 > queue_delayed_work_on+0x1ca/0x390 kernel/workqueue.c:2552 > queue_delayed_work include/linux/workqueue.h:677 [inline] > gfs2_glock_queue_work fs/gfs2/glock.c:250 [inline] > do_xmote+0xaf8/0x1250 fs/gfs2/glock.c:832 > glock_work_func+0x343/0x5c0 fs/gfs2/glock.c:1090 > process_one_work kernel/workqueue.c:3229 [inline] > process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 > worker_thread+0x870/0xd30 kernel/workqueue.c:3391 > kthread+0x2f0/0x390 kernel/kthread.c:389 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > > The buggy address belongs to the object at ffff88804e480fd8 > which belongs to the cache gfs2_glock(aspace) of size 1224 > The buggy address is located 968 bytes inside of > freed 1224-byte region [ffff88804e480fd8, ffff88804e4814a0) > > The buggy address belongs to the physical page: > page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e480 > head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) > page_type: f5(slab) > raw: 04fff00000000040 ffff88801fa3d000 dead000000000122 0000000000000000 > raw: 0000000000000000 00000000800c000c 00000001f5000000 0000000000000000 > head: 04fff00000000040 ffff88801fa3d000 dead000000000122 0000000000000000 > head: 0000000000000000 00000000800c000c 00000001f5000000 0000000000000000 > head: 04fff00000000002 ffffea0001392001 ffffffffffffffff 0000000000000000 > head: 0000000700000004 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5580, tgid 5580 (syz.0.16), ts 92534711834, free_ts 92373479633 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 > prep_new_page mm/page_alloc.c:1564 [inline] > get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3474 > __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751 > alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 > alloc_slab_page+0x6a/0x110 mm/slub.c:2408 > allocate_slab+0x5a/0x2b0 mm/slub.c:2574 > new_slab mm/slub.c:2627 [inline] > ___slab_alloc+0xc27/0x14a0 mm/slub.c:3815 > __slab_alloc+0x58/0xa0 mm/slub.c:3905 > __slab_alloc_node mm/slub.c:3980 [inline] > slab_alloc_node mm/slub.c:4141 [inline] > kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4160 > gfs2_glock_get+0x309/0x1010 fs/gfs2/glock.c:1178 > gfs2_inode_lookup+0x2a3/0xc90 fs/gfs2/inode.c:135 > gfs2_lookup_root fs/gfs2/ops_fstype.c:440 [inline] > init_sb+0xa2a/0x1270 fs/gfs2/ops_fstype.c:507 > gfs2_fill_super+0x19b3/0x24d0 fs/gfs2/ops_fstype.c:1216 > get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 > gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 > vfs_get_tree+0x90/0x2b0 fs/super.c:1814 > page last free pid 52 tgid 52 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1127 [inline] > free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2657 > discard_slab mm/slub.c:2673 [inline] > __put_partials+0x160/0x1c0 mm/slub.c:3142 > put_cpu_partial+0x17c/0x250 mm/slub.c:3217 > __slab_free+0x290/0x380 mm/slub.c:4468 > qlink_free mm/kasan/quarantine.c:163 [inline] > qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 > kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 > __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 > kasan_slab_alloc include/linux/kasan.h:250 [inline] > slab_post_alloc_hook mm/slub.c:4104 [inline] > slab_alloc_node mm/slub.c:4153 [inline] > kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205 > __alloc_skb+0x1c3/0x440 net/core/skbuff.c:668 > alloc_skb include/linux/skbuff.h:1323 [inline] > alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612 > sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2881 > sock_alloc_send_skb include/net/sock.h:1797 [inline] > mld_newpack+0x1c3/0xaf0 net/ipv6/mcast.c:1747 > add_grhead net/ipv6/mcast.c:1850 [inline] > add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1988 > mld_send_cr net/ipv6/mcast.c:2114 [inline] > mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2651 > process_one_work kernel/workqueue.c:3229 [inline] > process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 > worker_thread+0x870/0xd30 kernel/workqueue.c:3391 > > Memory state around the buggy address: > ffff88804e481280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88804e481300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > >ffff88804e481380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88804e481400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88804e481480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. >
