For me it seems to be a kernel bug, but perhaps I'm wrong.
Could someone clarify the matter?
What can cause such freeze?
Alexander Pyhalov писал 08.10.2013 10:30:
# mdb -k
Loading modules: [ unix genunix specfs dtrace mac cpu.generic uppc
pcplusmp scsi_vhci zfs qlc fctl fcp sd ip hook neti sockfs arp usba
uhci stmf stmf_sbd md lofs random idm crypto sppp cpc fcip ufs
logindmux ptm smbsrv nfs nsmb ipc ]
0t27270::pid2proc | ::walk thread | ::findstack -v
stack pointer for thread ffffff04fdac17a0: ffffff002065bcc0
[ ffffff002065bcc0 _resume_from_idle+0xf4() ]
ffffff002065bcf0 swtch+0x141()
ffffff002065bd30 cv_wait+0x70(ffffff04fa658ec2, ffffff04fa658eb8)
ffffff002065bde0 as_unmap+0x223(ffffff04fa658eb8, fd213000, 200800)
ffffff002065be20 munmap+0x83(fd213000, 200800)
ffffff002065bec0 dtrace_systrace_syscall32+0xe4(fd213000, 200800,
4dd6c00, fdac17a0, 1, 0)
ffffff002065bf10 _sys_sysenter_post_swapgs+0x149()
stack pointer for thread ffffff04f6326420: ffffff0020d5dc60
[ ffffff0020d5dc60 _resume_from_idle+0xf4() ]
ffffff0020d5dc90 swtch+0x141()
ffffff0020d5dd30 cv_timedwait_sig_hires+0x39d(ffffff04f632660e,
ffffff04f6326610, 27448c396e3e, 1, 3)
ffffff0020d5dd60 cv_timedwait_sig_hrtime+0x2a(ffffff04f632660e,
ffffff04f6326610, 27448c396e3e)
ffffff0020d5de20 poll_common+0x43c(fe4beb00, 0, ffffff0020d5de40, 0)
ffffff0020d5dec0 pollsys+0xe3(fe4beb00, 0, fe4beba8, 0)
ffffff0020d5df10 _sys_sysenter_post_swapgs+0x149()
stack pointer for thread ffffff0505c6c060: ffffff001eabdc60
[ ffffff001eabdc60 _resume_from_idle+0xf4() ]
ffffff001eabdc90 swtch+0x141()
ffffff001eabdd30 cv_timedwait_sig_hires+0x39d(ffffff0505c6c24e,
ffffff0505c6c250, 276e690ddc46, 1, 3)
ffffff001eabdd60 cv_timedwait_sig_hrtime+0x2a(ffffff0505c6c24e,
ffffff0505c6c250, 276e690ddc46)
ffffff001eabde20 poll_common+0x43c(fe13eb00, 0, ffffff001eabde40, 0)
ffffff001eabdec0 pollsys+0xe3(fe13eb00, 0, fe13eba8, 0)
ffffff001eabdf10 _sys_sysenter_post_swapgs+0x149()
I'm just a bit confused: is munmap supposed to wait for something in
any case? I thought it just have to return with error if something is
wrong...
It seems that application also uses madvise with MADV_WILLNEED on its
mapped memory. Can it influence the munmap behavior?
---
System Administrator of Southern Federal University Computer Center
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