Kernel panic at down_read_trylock+0x9

Solution Verified - Updated -

Issue

  • Server experiences kernel panic at down_read_trylock+0x9 after being called from page_lock_anon_vma_read.
crash> bt
PID: 926    TASK: ffff8820840c4500  CPU: 3   COMMAND: "java"
 #0 [ffff88245cdef5d8] machine_kexec at ffffffff81051e9b
 #1 [ffff88245cdef638] crash_kexec at ffffffff810f27e2
 #2 [ffff88245cdef708] oops_end at ffffffff8163f408
 #3 [ffff88245cdef730] die at ffffffff8101859b
 #4 [ffff88245cdef760] do_general_protection at ffffffff8163ecfe
 #5 [ffff88245cdef790] general_protection at ffffffff8163e5a8
    [exception RIP: down_read_trylock+0x9]                                  <--- panicked here and called from below
    RIP: ffffffff810aa9f9  RSP: ffff88245cdef848  RFLAGS: 00010282
    RAX: 0000000000000000  RBX: ffff883ec5bb5140  RCX: 0000000000000000
    RDX: 0000000000000000  RSI: 0000000000000000  RDI: ae275c445a85df8f
    RBP: ffff88245cdef848   R8: ffffea00528457a0   R9: ffff883fce384148
    R10: 0000000000000008  R11: 0000000000000002  R12: ffff883ec5bb5141
    R13: ffffea0052845780  R14: ae275c445a85df8f  R15: ffffea0052845780
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0000
 #6 [ffff88245cdef850] page_lock_anon_vma_read at ffffffff811a3335          <---
 #7 [ffff88245cdef880] page_referenced at ffffffff811a35b7
 #8 [ffff88245cdef8f8] shrink_active_list at ffffffff8117e8cc
 #9 [ffff88245cdef9b0] shrink_lruvec at ffffffff8117ef8d
#10 [ffff88245cdefab0] shrink_zone at ffffffff8117f2a6
#11 [ffff88245cdefb08] do_try_to_free_pages at ffffffff8117f7b0
#12 [ffff88245cdefb80] try_to_free_pages at ffffffff8117fc9c
#13 [ffff88245cdefc18] __alloc_pages_nodemask at ffffffff81173998
#14 [ffff88245cdefd50] alloc_page_interleave at ffffffff811b480a
#15 [ffff88245cdefd70] alloc_pages_vma at ffffffff811b8000
#16 [ffff88245cdefdd8] do_huge_pmd_anonymous_page at ffffffff811cc973
#17 [ffff88245cdefe38] handle_mm_fault at ffffffff8119714e
#18 [ffff88245cdefec8] __do_page_fault at ffffffff81642000
#19 [ffff88245cdeff28] do_page_fault at ffffffff81642323
#20 [ffff88245cdeff50] page_fault at ffffffff8163e608
    RIP: 00007fb5c08d7c8b  RSP: 00007fb57dd7ab00  RFLAGS: 00010202
    RAX: 00007fb5c1226909  RBX: 00007fb5b9d7a800  RCX: 00007fb5c11f02b8
    RDX: 0000000000000002  RSI: 0000000756200800  RDI: 00007fb5b9d7a858
    RBP: 00007fb57dd7ab30   R8: 0000000000000002   R9: 0000000000000002
    R10: ffffffffffffffff  R11: 00007fb5c12eab4a  R12: 0000000756200800
    R13: 0000000000000003  R14: 00000007c00783f0  R15: 0000000000000020
    ORIG_RAX: ffffffffffffffff  CS: 0033  SS: 002b

Environment

  • Red Hat Enterprise Linux 7.
    • Reported on Red Hat Enterprise Linux 7.1 and 7.2.
    • Red Hat Enterprise Linux 7.3 and above are unaffected .

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