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  1. root@syzkaller:~# uname -a
  2. Linux syzkaller 4.15.0-rc9 #1 SMP Tue Mar 6 16:59:27 CST 2018 x86_64 GNU/Linux
  3. root@syzkaller:~# ./crash
  4. [ 21.144969] audit: type=1400 audit(1520377753.212:9): avc: denied { map } for pid=2742 c1
  5. [ 21.147839] mmap: crash (2742) uses deprecated remap_file_pages() syscall. See Documentatio.
  6. Segmentation fault
  7. root@syzkaller:~[ 21.148195] ------------[ cut here ]------------
  8. # [ 21.148200] kernel BUG at mm/hugetlb.c:742!
  9. [ 21.148213] invalid opcode: 0000 [#1] SMP KASAN PTI
  10. [ 21.148216] Modules linked in:
  11. [ 21.148225] CPU: 0 PID: 2742 Comm: crash Not tainted 4.15.0-rc9 #1
  12. [ 21.148230] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-20171110_1004
  13. [ 21.148243] RIP: 0010:resv_map_release+0x20e/0x2c0
  14. [ 21.148247] RSP: 0018:ffff8800670b7588 EFLAGS: 00010293
  15. [ 21.148254] RAX: ffff8800683d2ec0 RBX: ffffed000ce16eb9 RCX: ffffffffaa43d19e
  16. [ 21.148259] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88006af9ad40
  17. [ 21.148264] RBP: ffff88006af9ad48 R08: 1ffff1000ce16e35 R09: 0000000000000000
  18. [ 21.148268] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88006af9ad48
  19. [ 21.148273] R13: dffffc0000000000 R14: ffff88006af9ad48 R15: ffff88006af9ad48
  20. [ 21.148280] FS: 00007f8135274700(0000) GS:ffff88006d000000(0000) knlGS:0000000000000000
  21. [ 21.148285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  22. [ 21.148290] CR2: 00007f81350582e0 CR3: 0000000068b76000 CR4: 00000000000006f0
  23. [ 21.148296] Call Trace:
  24. [ 21.148310] ? resv_map_alloc+0x480/0x480
  25. [ 21.148322] ? do_raw_spin_trylock+0x180/0x180
  26. [ 21.148335] ? hugetlbfs_setattr+0x470/0x470
  27. [ 21.148345] hugetlbfs_evict_inode+0x74/0xa0
  28. [ 21.148353] evict+0x44a/0x880
  29. [ 21.148363] ? destroy_inode+0x1d0/0x1d0
  30. [ 21.148372] ? iput+0x538/0xa50
  31. [ 21.148382] ? lock_downgrade+0x690/0x690
  32. [ 21.148395] ? do_raw_spin_trylock+0x180/0x180
  33. [ 21.148405] ? _atomic_dec_and_lock+0xd9/0x153
  34. [ 21.148414] ? cpumask_local_spread+0x230/0x230
  35. [ 21.148426] iput+0x540/0xa50
  36. [ 21.148438] ? evict_inodes+0x4f0/0x4f0
  37. [ 21.148454] ? fsnotify_grab_connector+0x17d/0x270
  38. [ 21.148463] ? fsnotify_recalc_mask.part.7+0x90/0x90
  39. [ 21.148472] ? fsnotify_first_mark+0x2a0/0x2a0
  40. [ 21.148489] dentry_unlink_inode+0x487/0x580
  41. [ 21.148501] ? release_dentry_name_snapshot+0x60/0x60
  42. [ 21.148510] ? reacquire_held_locks+0xba/0x430
  43. [ 21.148519] ? dput.part.22+0x45b/0x7e0
  44. [ 21.148528] ? __d_drop+0x27f/0x410
  45. [ 21.148538] ? d_exact_alias+0x5b0/0x5b0
  46. [ 21.148547] ? lockref_get_not_dead+0x70/0x70
  47. [ 21.148557] ? lock_acquire+0x15b/0x430
  48. [ 21.148568] __dentry_kill+0x38e/0x680
  49. [ 21.148577] ? lock_release+0x830/0x830
  50. [ 21.148585] ? check_and_drop+0x150/0x150
  51. [ 21.148596] ? do_raw_spin_lock+0x1a0/0x1a0
  52. [ 21.148605] ? rcutorture_record_progress+0x10/0x10
  53. [ 21.148617] dput.part.22+0x638/0x7e0
  54. [ 21.148626] ? d_move+0x80/0x80
  55. [ 21.148635] ? task_active_pid_ns+0xd0/0xd0
  56. [ 21.148644] ? security_file_free+0x42/0x80
  57. [ 21.148650] ? rcu_read_lock_sched_held+0xe4/0x120
  58. [ 21.148658] ? kmem_cache_free+0x22f/0x2b0
  59. [ 21.148668] dput+0x1b/0x30
  60. [ 21.148675] __fput+0x4b3/0x7a0
  61. [ 21.148685] ? fput+0x130/0x130
  62. [ 21.148695] ? _raw_spin_unlock_irq+0x24/0x40
  63. [ 21.148707] task_work_run+0x16a/0x220
  64. [ 21.148718] ? task_work_cancel+0x1e0/0x1e0
  65. [ 21.148726] ? task_work_add+0xef/0x180
  66. [ 21.148737] ? exit_to_usermode_loop+0x131/0x1d0
  67. [ 21.148747] exit_to_usermode_loop+0xd3/0x1d0
  68. [ 21.148755] ? trace_raw_output_sys_exit+0x100/0x100
  69. [ 21.148765] ? SyS_remap_file_pages+0x6f3/0x940
  70. [ 21.148773] ? SyS_remap_file_pages+0x558/0x940
  71. [ 21.148781] syscall_return_slowpath+0x379/0x480
  72. [ 21.148790] ? prepare_exit_to_usermode+0x350/0x350
  73. [ 21.148799] ? entry_SYSCALL_64_fastpath+0x6f/0x9c
  74. [ 21.148808] ? trace_hardirqs_on_caller+0x381/0x570
  75. [ 21.148815] ? trace_hardirqs_on_thunk+0x1a/0x1c
  76. [ 21.148826] entry_SYSCALL_64_fastpath+0x9a/0x9c
  77. [ 21.148831] RIP: 0033:0x7f8134daab79
  78. [ 21.148835] RSP: 002b:00007ffda8cf2338 EFLAGS: 00000217 ORIG_RAX: 00000000000000d8
  79. [ 21.148842] RAX: fffffffffffffff4 RBX: 0000000000000000 RCX: 00007f8134daab79
  80. [ 21.148848] RDX: 0000000000000000 RSI: 0000000000600000 RDI: 0000000020a00000
  81. [ 21.148853] RBP: 00007ffda8cf2350 R08: 0000000000000000 R09: 0000000000000000
  82. [ 21.148858] R10: 0020000000000000 R11: 0000000000000217 R12: 0000000000400400
  83. [ 21.148863] R13: 00007ffda8cf2450 R14: 0000000000000000 R15: 0000000000000000
  84. [ 21.148874] Code: 00 fc ff df 49 01 c5 49 c7 45 00 00 00 00 00 41 c7 45 08 00 00 00 00 48 8
  85. [ 21.148986] RIP: resv_map_release+0x20e/0x2c0 RSP: ffff8800670b7588
  86. [ 21.148990] ---[ end trace 69f6c49e09ae011b ]---
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