Hi All
I am trying to map a buffer allocated with kmalloc to user space using
mmap() and immediately unmapping that with munmap() in a loop for some
testing purpose.
But I get the kernel panic after some time (means after some iterations of the above loop) with message below :
login: ----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at rmap:479
invalid operand: 0000 [1] SMP
CPU 3
Modules linked in: ccp_ib(U) ccp(U) md5 ipv6 parport_pc lp parport autofs4 i2c_dev i2c_core nfs lockd nfs_acl sund
id: 5533, comm: try Tainted: PF 2.6.9-42.ELsmp
RIP: 0010:[<ffffffff8016f15b>] <ffffffff8016f15b>{page_remove_rmap+39}
RSP: 0000:000001021eb6bc68 EFLAGS: 00010286
RAX: 00000000ffffffff RBX: 0000010001079380 RCX: 0000010001079380
RDX: 0000000000230000 RSI: 00000000002281a6 RDI: 000001022fe45c50
RBP: 000001022fe45c50 R08: 0000000000000002 R09: 000001021eb6bd60
R10: 0000000000000000 R11: 0000000000000008 R12: 0000000000000000
R13: 000001021edcf478 R14: 80000002281a6020 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffffffff804e5200(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 000000000000080f CR3: 00000000069d4000 CR4: 00000000000006e0
Process try (pid: 5533, threadinfo 000001021eb6a000, task 00000102273157f0)
Stack: 0000000001000080 ffffffff80167e13 0000000000001000 0000002a95690000
000001021afdc558 0000002a9568f000 000001021f236550 0000002a95690000
0000002a9568f000 0000010001079380
Call Trace:<ffffffff80167e13>{unmap_vmas+1345} <ffffffff8016d08c>{exit_mmap+144}
<ffffffff801359b9>{mmput+102} <ffffffff80139e1c>{do_exit+632}
<ffffffff8014159c>{__dequeue_signal+458} <ffffffff8013a8f6>{sys_exit_group+0}
<ffffffff80143418>{get_signal_to_deliver+1084} <ffffffff8010f6fb>{do_signal+131}
<ffffffff8016cd55>{do_mmap_pgoff+1610} <ffffffff8016cd55>{do_mmap_pgoff+1610}
<ffffffff801ea645>{__up_write+20} <ffffffff80110902>{retint_signal+62}
Code: 0f 0b b7 b0 32 80 ff ff ff ff df 01 9c 8f 04 24 fa 48 c7 c2
RIP <ffffffff8016f15b>{page_remove_rmap+39} RSP <000001021eb6bc68>
<0>Kernel panic - not syncing: Oops
If anybody has experienced this problem and have any solution, please reply.
Thanks in advance.
--
Anuj Aggarwal
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: :Ⓐ : # apt-get install hakuna-matata
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