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  1. Nov 20 22:46:59 linux-test kernel: ======================================================
  2. Nov 20 22:46:59 linux-test kernel: [ INFO: possible circular locking dependency detected ]
  3. Nov 20 22:46:59 linux-test kernel: 3.18.0-rc5-wl-debug #34 Tainted: G O
  4. Nov 20 22:46:59 linux-test kernel: -------------------------------------------------------
  5. Nov 20 22:46:59 linux-test kernel: hostapd/451 is trying to acquire lock:
  6. Nov 20 22:46:59 linux-test kernel: ((&arvif->wep_key_work)){+.+...}, at: [<ffffffff810872d5>] flush_work+0x5/0x290
  7. Nov 20 22:46:59 linux-test kernel: \x0abut task is already holding lock:
  8. Nov 20 22:46:59 linux-test kernel: (&ar->conf_mutex){+.+.+.}, at: [<ffffffffa0b99f00>] ath10k_remove_interface+0x40/0x290 [ath10k_core]
  9. Nov 20 22:46:59 linux-test kernel: \x0awhich lock already depends on the new lock.\x0a
  10. Nov 20 22:46:59 linux-test kernel: \x0athe existing dependency chain (in reverse order) is:
  11. Nov 20 22:46:59 linux-test kernel: \x0a-> #1 (&ar->conf_mutex){+.+.+.}:
  12. Nov 20 22:46:59 linux-test kernel: [<ffffffff810c05cb>] lock_acquire+0xbb/0x170
  13. Nov 20 22:46:59 linux-test kernel: [<ffffffff815827cb>] mutex_lock_nested+0x7b/0x480
  14. Nov 20 22:46:59 linux-test kernel: [<ffffffffa0b944ab>] ath10k_tx_wep_key_work+0x2b/0xc0 [ath10k_core]
  15. Nov 20 22:46:59 linux-test kernel: [<ffffffff810882a7>] process_one_work+0x1e7/0x550
  16. Nov 20 22:46:59 linux-test kernel: [<ffffffff81088a9b>] worker_thread+0x6b/0x4a0
  17. Nov 20 22:46:59 linux-test kernel: [<ffffffff8108deeb>] kthread+0x10b/0x130
  18. Nov 20 22:46:59 linux-test kernel: [<ffffffff81586cbc>] ret_from_fork+0x7c/0xb0
  19. Nov 20 22:46:59 linux-test kernel: \x0a-> #0 ((&arvif->wep_key_work)){+.+...}:
  20. Nov 20 22:46:59 linux-test kernel: [<ffffffff810bf731>] __lock_acquire+0x1ba1/0x2180
  21. Nov 20 22:46:59 linux-test kernel: [<ffffffff810c05cb>] lock_acquire+0xbb/0x170
  22. Nov 20 22:46:59 linux-test kernel: [<ffffffff8108731c>] flush_work+0x4c/0x290
  23. Nov 20 22:46:59 linux-test kernel: [<ffffffff81087fc4>] __cancel_work_timer+0xa4/0x160
  24. Nov 20 22:46:59 linux-test kernel: [<ffffffff81088090>] cancel_work_sync+0x10/0x20
  25. Nov 20 22:46:59 linux-test kernel: [<ffffffffa0b99f0c>] ath10k_remove_interface+0x4c/0x290 [ath10k_core]
  26. Nov 20 22:46:59 linux-test kernel: [<ffffffffa05c03fb>] ieee80211_do_stop+0x54b/0x9a0 [mac80211]
  27. Nov 20 22:46:59 linux-test kernel: [<ffffffffa05c086a>] ieee80211_stop+0x1a/0x20 [mac80211]
  28. Nov 20 22:46:59 linux-test kernel: [<ffffffff814714cd>] __dev_close_many+0xad/0x110
  29. Nov 20 22:46:59 linux-test kernel: [<ffffffff814716b5>] __dev_close+0x45/0x70
  30. Nov 20 22:46:59 linux-test kernel: [<ffffffff8147aed1>] __dev_change_flags+0xa1/0x170
  31. Nov 20 22:46:59 linux-test kernel: [<ffffffff8147afc9>] dev_change_flags+0x29/0x70
  32. Nov 20 22:46:59 linux-test kernel: [<ffffffff814f1149>] devinet_ioctl+0x629/0x700
  33. Nov 20 22:46:59 linux-test kernel: [<ffffffff814f2b75>] inet_ioctl+0x65/0x90
  34. Nov 20 22:46:59 linux-test kernel: [<ffffffff814584f9>] sock_do_ioctl+0x29/0x60
  35. Nov 20 22:46:59 linux-test kernel: [<ffffffff81458b1b>] sock_ioctl+0x20b/0x2e0
  36. Nov 20 22:46:59 linux-test kernel: [<ffffffff811f8050>] do_vfs_ioctl+0x2f0/0x520
  37. Nov 20 22:46:59 linux-test kernel: [<ffffffff811f8301>] SyS_ioctl+0x81/0xa0
  38. Nov 20 22:46:59 linux-test kernel: [<ffffffff81586d69>] system_call_fastpath+0x12/0x17
  39. Nov 20 22:46:59 linux-test kernel: \x0aother info that might help us debug this:\x0a
  40. Nov 20 22:46:59 linux-test kernel: Possible unsafe locking scenario:\x0a
  41. Nov 20 22:46:59 linux-test kernel: CPU0 CPU1
  42. Nov 20 22:46:59 linux-test kernel: ---- ----
  43. Nov 20 22:46:59 linux-test kernel: lock(&ar->conf_mutex);
  44. Nov 20 22:46:59 linux-test kernel: lock((&arvif->wep_key_work));
  45. Nov 20 22:46:59 linux-test kernel: lock(&ar->conf_mutex);
  46. Nov 20 22:46:59 linux-test kernel: lock((&arvif->wep_key_work));
  47. Nov 20 22:46:59 linux-test kernel: \x0a *** DEADLOCK ***\x0a
  48. Nov 20 22:46:59 linux-test kernel: 2 locks held by hostapd/451:
  49. Nov 20 22:46:59 linux-test kernel: #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff81487a07>] rtnl_lock+0x17/0x20
  50. Nov 20 22:46:59 linux-test kernel: #1: (&ar->conf_mutex){+.+.+.}, at: [<ffffffffa0b99f00>] ath10k_remove_interface+0x40/0x290 [ath10k_core]
  51. Nov 20 22:46:59 linux-test kernel: \x0astack backtrace:
  52. Nov 20 22:46:59 linux-test kernel: CPU: 1 PID: 451 Comm: hostapd Tainted: G O 3.18.0-rc5-wl-debug #34
  53. Nov 20 22:46:59 linux-test kernel: Hardware name: LENOVO 28427ZQ/INVALID, BIOS 6JET58WW (1.16 ) 09/17/2009
  54. Nov 20 22:46:59 linux-test kernel: 0000000000000000 000000003a9d06eb ffff880138d4f8a8 ffffffff8157e8ce
  55. Nov 20 22:46:59 linux-test kernel: 0000000000000000 ffffffff82606500 ffff880138d4f8f8 ffffffff8157d525
  56. Nov 20 22:46:59 linux-test kernel: 00000000001d60c0 ffff880138d4f968 ffff880138c82c60 ffff880138c83500
  57. Nov 20 22:46:59 linux-test kernel: Call Trace:
  58. Nov 20 22:46:59 linux-test kernel: [<ffffffff8157e8ce>] dump_stack+0x4e/0x71
  59. Nov 20 22:46:59 linux-test kernel: [<ffffffff8157d525>] print_circular_bug+0x2b2/0x2c3
  60. Nov 20 22:46:59 linux-test kernel: [<ffffffff810bf731>] __lock_acquire+0x1ba1/0x2180
  61. Nov 20 22:46:59 linux-test kernel: [<ffffffff81019530>] ? dump_trace+0x170/0x360
  62. Nov 20 22:46:59 linux-test kernel: [<ffffffff810c05cb>] lock_acquire+0xbb/0x170
  63. Nov 20 22:46:59 linux-test kernel: [<ffffffff810872d5>] ? flush_work+0x5/0x290
  64. Nov 20 22:46:59 linux-test kernel: [<ffffffff8108731c>] flush_work+0x4c/0x290
  65. Nov 20 22:46:59 linux-test kernel: [<ffffffff810872d5>] ? flush_work+0x5/0x290
  66. Nov 20 22:46:59 linux-test kernel: [<ffffffff810bd5bc>] ? mark_held_locks+0x7c/0xb0
  67. Nov 20 22:46:59 linux-test kernel: [<ffffffff81582b0d>] ? mutex_lock_nested+0x3bd/0x480
  68. Nov 20 22:46:59 linux-test kernel: [<ffffffff810bd5bc>] ? mark_held_locks+0x7c/0xb0
  69. Nov 20 22:46:59 linux-test kernel: [<ffffffff81087fb1>] ? __cancel_work_timer+0x91/0x160
  70. Nov 20 22:46:59 linux-test kernel: [<ffffffff81087fc4>] __cancel_work_timer+0xa4/0x160
  71. Nov 20 22:46:59 linux-test kernel: [<ffffffff81088090>] cancel_work_sync+0x10/0x20
  72. Nov 20 22:46:59 linux-test kernel: [<ffffffffa0b99f0c>] ath10k_remove_interface+0x4c/0x290 [ath10k_core]
  73. Nov 20 22:46:59 linux-test kernel: [<ffffffffa05c03fb>] ieee80211_do_stop+0x54b/0x9a0 [mac80211]
  74. Nov 20 22:46:59 linux-test kernel: [<ffffffff8149d1f3>] ? dev_deactivate_many+0x213/0x260
  75. Nov 20 22:46:59 linux-test kernel: [<ffffffffa05c086a>] ieee80211_stop+0x1a/0x20 [mac80211]
  76. Nov 20 22:46:59 linux-test kernel: [<ffffffff814714cd>] __dev_close_many+0xad/0x110
  77. Nov 20 22:46:59 linux-test kernel: [<ffffffff814716b5>] __dev_close+0x45/0x70
  78. Nov 20 22:46:59 linux-test kernel: [<ffffffff8147aed1>] __dev_change_flags+0xa1/0x170
  79. Nov 20 22:46:59 linux-test kernel: [<ffffffff8147afc9>] dev_change_flags+0x29/0x70
  80. Nov 20 22:46:59 linux-test kernel: [<ffffffff814f1149>] devinet_ioctl+0x629/0x700
  81. Nov 20 22:46:59 linux-test kernel: [<ffffffff814f2b75>] inet_ioctl+0x65/0x90
  82. Nov 20 22:46:59 linux-test kernel: [<ffffffff814584f9>] sock_do_ioctl+0x29/0x60
  83. Nov 20 22:46:59 linux-test kernel: [<ffffffff81458b1b>] sock_ioctl+0x20b/0x2e0
  84. Nov 20 22:46:59 linux-test kernel: [<ffffffff811f8050>] do_vfs_ioctl+0x2f0/0x520
  85. Nov 20 22:46:59 linux-test kernel: [<ffffffff81586d95>] ? sysret_check+0x22/0x5d
  86. Nov 20 22:46:59 linux-test kernel: [<ffffffff811f8301>] SyS_ioctl+0x81/0xa0
  87. Nov 20 22:46:59 linux-test kernel: [<ffffffff81586d69>] system_call_fastpath+0x12/0x17
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