FKIE_CVE-2025-71065

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-01-14 16:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid potential deadlock As Jiaming Zhang and syzbot reported, there is potential deadlock in f2fs as below: Chain exists of: &sbi->cp_rwsem --> fs_reclaim --> sb_internal#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal#2); lock(fs_reclaim); lock(sb_internal#2); rlock(&sbi->cp_rwsem); *** DEADLOCK *** 3 locks held by kswapd0/73: #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7015 [inline] #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2800 mm/vmscan.c:7389 #1: ffff8880118400e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline] #1: ffff8880118400e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197 #2: ffff888011840610 (sb_internal#2){.+.+}-{0:0}, at: f2fs_evict_inode+0x8d9/0x1b60 fs/f2fs/inode.c:890 stack backtrace: CPU: 0 UID: 0 PID: 73 Comm: kswapd0 Not tainted syzkaller #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_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 f2fs_down_read fs/f2fs/f2fs.h:2278 [inline] f2fs_lock_op fs/f2fs/f2fs.h:2357 [inline] f2fs_do_truncate_blocks+0x21c/0x10c0 fs/f2fs/file.c:791 f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:867 f2fs_truncate+0x489/0x7c0 fs/f2fs/file.c:925 f2fs_evict_inode+0x9f2/0x1b60 fs/f2fs/inode.c:897 evict+0x504/0x9c0 fs/inode.c:810 f2fs_evict_inode+0x1dc/0x1b60 fs/f2fs/inode.c:853 evict+0x504/0x9c0 fs/inode.c:810 dispose_list fs/inode.c:852 [inline] prune_icache_sb+0x21b/0x2c0 fs/inode.c:1000 super_cache_scan+0x39b/0x4b0 fs/super.c:224 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628 shrink_one+0x28a/0x7c0 mm/vmscan.c:4955 shrink_many mm/vmscan.c:5016 [inline] lru_gen_shrink_node mm/vmscan.c:5094 [inline] shrink_node+0x315d/0x3780 mm/vmscan.c:6081 kswapd_shrink_node mm/vmscan.c:6941 [inline] balance_pgdat mm/vmscan.c:7124 [inline] kswapd+0x147c/0x2800 mm/vmscan.c:7389 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> The root cause is deadlock among four locks as below: kswapd - fs_reclaim --- Lock A - shrink_one - evict - f2fs_evict_inode - sb_start_intwrite --- Lock B - iput - evict - f2fs_evict_inode - sb_start_intwrite --- Lock B - f2fs_truncate - f2fs_truncate_blocks - f2fs_do_truncate_blocks - f2fs_lock_op --- Lock C ioctl - f2fs_ioc_commit_atomic_write - f2fs_lock_op --- Lock C - __f2fs_commit_atomic_write - __replace_atomic_write_block - f2fs_get_dnode_of_data - __get_node_folio - f2fs_check_nid_range - f2fs_handle_error - f2fs_record_errors - f2fs_down_write --- Lock D open - do_open - do_truncate - security_inode_need_killpriv - f2fs_getxattr - lookup_all_xattrs - f2fs_handle_error - f2fs_record_errors - f2fs_down_write --- Lock D - f2fs_commit_super - read_mapping_folio - filemap_alloc_folio_noprof - prepare_alloc_pages - fs_reclaim_acquire --- Lock A In order to a ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c3bab5c6261aa22c561ef56b7365959a90e7d91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86a85a7b622e6e8dba69810257733ce5eab5ed55
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bd6dff8b801abaa362272894bda795bf0cf1307
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca8b201f28547e28343a6f00a6e91fa8c09572fe
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid potential deadlock\n\nAs Jiaming Zhang and syzbot reported, there is potential deadlock in\nf2fs as below:\n\nChain exists of:\n  \u0026sbi-\u003ecp_rwsem --\u003e fs_reclaim --\u003e sb_internal#2\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  rlock(sb_internal#2);\n                               lock(fs_reclaim);\n                               lock(sb_internal#2);\n  rlock(\u0026sbi-\u003ecp_rwsem);\n\n *** DEADLOCK ***\n\n3 locks held by kswapd0/73:\n #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7015 [inline]\n #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2800 mm/vmscan.c:7389\n #1: ffff8880118400e0 (\u0026type-\u003es_umount_key#50){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline]\n #1: ffff8880118400e0 (\u0026type-\u003es_umount_key#50){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197\n #2: ffff888011840610 (sb_internal#2){.+.+}-{0:0}, at: f2fs_evict_inode+0x8d9/0x1b60 fs/f2fs/inode.c:890\n\nstack backtrace:\nCPU: 0 UID: 0 PID: 73 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043\n check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175\n check_prev_add kernel/locking/lockdep.c:3165 [inline]\n check_prevs_add kernel/locking/lockdep.c:3284 [inline]\n validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908\n __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237\n lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868\n down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537\n f2fs_down_read fs/f2fs/f2fs.h:2278 [inline]\n f2fs_lock_op fs/f2fs/f2fs.h:2357 [inline]\n f2fs_do_truncate_blocks+0x21c/0x10c0 fs/f2fs/file.c:791\n f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:867\n f2fs_truncate+0x489/0x7c0 fs/f2fs/file.c:925\n f2fs_evict_inode+0x9f2/0x1b60 fs/f2fs/inode.c:897\n evict+0x504/0x9c0 fs/inode.c:810\n f2fs_evict_inode+0x1dc/0x1b60 fs/f2fs/inode.c:853\n evict+0x504/0x9c0 fs/inode.c:810\n dispose_list fs/inode.c:852 [inline]\n prune_icache_sb+0x21b/0x2c0 fs/inode.c:1000\n super_cache_scan+0x39b/0x4b0 fs/super.c:224\n do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437\n shrink_slab_memcg mm/shrinker.c:550 [inline]\n shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628\n shrink_one+0x28a/0x7c0 mm/vmscan.c:4955\n shrink_many mm/vmscan.c:5016 [inline]\n lru_gen_shrink_node mm/vmscan.c:5094 [inline]\n shrink_node+0x315d/0x3780 mm/vmscan.c:6081\n kswapd_shrink_node mm/vmscan.c:6941 [inline]\n balance_pgdat mm/vmscan.c:7124 [inline]\n kswapd+0x147c/0x2800 mm/vmscan.c:7389\n kthread+0x70e/0x8a0 kernel/kthread.c:463\n ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nThe root cause is deadlock among four locks as below:\n\nkswapd\n- fs_reclaim\t\t\t\t--- Lock A\n - shrink_one\n  - evict\n   - f2fs_evict_inode\n    - sb_start_intwrite\t\t\t--- Lock B\n\n- iput\n - evict\n  - f2fs_evict_inode\n   - sb_start_intwrite\t\t\t--- Lock B\n   - f2fs_truncate\n    - f2fs_truncate_blocks\n     - f2fs_do_truncate_blocks\n      - f2fs_lock_op\t\t\t--- Lock C\n\nioctl\n- f2fs_ioc_commit_atomic_write\n - f2fs_lock_op\t\t\t\t--- Lock C\n  - __f2fs_commit_atomic_write\n   - __replace_atomic_write_block\n    - f2fs_get_dnode_of_data\n     - __get_node_folio\n      - f2fs_check_nid_range\n       - f2fs_handle_error\n        - f2fs_record_errors\n         - f2fs_down_write\t\t--- Lock D\n\nopen\n- do_open\n - do_truncate\n  - security_inode_need_killpriv\n   - f2fs_getxattr\n    - lookup_all_xattrs\n     - f2fs_handle_error\n      - f2fs_record_errors\n       - f2fs_down_write\t\t--- Lock D\n        - f2fs_commit_super\n         - read_mapping_folio\n          - filemap_alloc_folio_noprof\n           - prepare_alloc_pages\n            - fs_reclaim_acquire\t--- Lock A\n\nIn order to a\n---truncated---"
    }
  ],
  "id": "CVE-2025-71065",
  "lastModified": "2026-01-14T16:26:00.933",
  "metrics": {},
  "published": "2026-01-13T16:16:05.853",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6c3bab5c6261aa22c561ef56b7365959a90e7d91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/86a85a7b622e6e8dba69810257733ce5eab5ed55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8bd6dff8b801abaa362272894bda795bf0cf1307"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca8b201f28547e28343a6f00a6e91fa8c09572fe"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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