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Date: Thu, 14 Jun 2012 18:01:29 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Andrey Vagin <avagin@...nvz.org> Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Cyrill Gorcunov <gorcunov@...nvz.org>, Pavel Emelyanov <xemul@...nvz.org> Subject: Re: general protection fault on finalizing task Hi Andrey, On 06/14, Andrey Vagin wrote: > > Hello, > > I'm developing CRIU (criu.org) and got this GP. I have seen it a few > time with the same stack trace. > It's not reproduced on 3.4.0-rc4+. > > general protection fault: 0000 [#1] SMP > CPU 0 > Modules linked in: udp_diag bridge stp llc ipv6 ext4 jbd2 dm_mirror > dm_region_hash dm_log dm_mod pcspkr virtio_balloon 8139too 8139cp mii > i2c_piix4 i2c_core ext3 jbd mbcache virtio_blk virtio_pci virtio_ring > virtio pata_acpi ata_generic ata_piix floppy [last unloaded: > scsi_wait_scan] > > Pid: 1647, comm: crtools Not tainted 3.5.0-rc2+ #203 Red Hat KVM > RIP: 0010:[<ffffffff811b453a>] [<ffffffff811b453a>] d_hash_and_lookup+0x2a/0x70 Could you please re-test with these http://marc.info/?l=linux-mm-commits&m=133962463616232 http://marc.info/?l=linux-mm-commits&m=133962463616231 patches applied? > RSP: 0018:ffff88001651bd28 EFLAGS: 00010246 > RAX: 0000000000003531 RBX: ffff88001651bd68 RCX: 0000000000000010 > RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000003531 > RBP: ffff88001651bd38 R08: 000000000000fffa R09: 0000000000000002 > R10: 0000000000000000 R11: 000000000000fffd R12: 6b6b6b6b6b6b6b6b > R13: ffff88001a3b3db0 R14: ffff88001651bd68 R15: 000000000000000f > FS: 00007ff80c4a2700(0000) GS:ffff88001f800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > CR2: 00007ff80c4ac000 CR3: 0000000001a0b000 CR4: 00000000000006f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process crtools (pid: 1647, threadinfo ffff88001651a000, task ffff880017154c40) > Stack: > ffff88001651bd78 0000000000000001 ffff88001651bdc8 ffffffff812050c0 > ffff8800185b44b0 ffff88001721e4a0 ffff88001721e4a0 0000000f81057b6c > 0000000200003531 ffff88001651bd78 ffff880032003531 0000000000000246 > Call Trace: > [<ffffffff812050c0>] proc_flush_task+0xa0/0x1e0 > [<ffffffff81057c0e>] release_task+0xce/0x690 > [<ffffffff81057b6c>] ? release_task+0x2c/0x690 > [<ffffffff810622c2>] exit_ptrace+0x102/0x140 > [<ffffffff81059c64>] do_exit+0x214/0xa70 > [<ffffffff81553cbb>] ? _raw_read_unlock+0x2b/0x50 > [<ffffffff8105a51b>] do_group_exit+0x5b/0xd0 > [<ffffffff8105a5a7>] sys_exit_group+0x17/0x20 > [<ffffffff8155cee9>] system_call_fastpath+0x16/0x1b > Code: 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 66 66 66 > 66 90 48 89 f3 49 89 fc 8b 76 04 48 8b 7b 08 e8 58 0c ff ff 89 03 <41> > f6 04 24 01 75 1f 48 89 de 4c 89 e7 e8 64 ff ff ff 48 8b 1c > RIP [<ffffffff811b453a>] d_hash_and_lookup+0x2a/0x70 > RSP <ffff88001651bd28> > ---[ end trace 250bb1fa95f4b805 ]--- > Fixing recursive fault but reboot is needed! > > Steps to reproduce: > * # git clone git://github.com/avagin/crtools.git -b gp-3.5 > * # cd crtools > * # make && make -C test > * # while :; do bash test/zdtm.sh pidns/static/session00 || break; done > * Wait a few seconds > > session00 is a test case for checking, that session ids restored correctly. > it create about 10 processes in a separate pidns, some of them wait > children, other ones > wait on read from pipe. crtools freezes and dumps state of this > processes and kill processes. > > The bug is reproduced, when crtools try to kill tasks (in this moment > crtools attached to this tasks by ptrace). > The meta code looks like: > for_each_task(pid) { > kill(pid, SIGKILL); > ptrace(PTRACE_DETACH, pid, NULL, NULL); > } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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