[LU-10544] racer use after free in adler32_update

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: WC Triage
• Reporter: Oleg Drokin

Description

Just had this on current master out of the blue:

[476681.006163] BUG: unable to handle kernel paging request at ffff8802f06c4000
[476681.007760] IP: [<ffffffffa020a170>] adler32_update+0x70/0x250 [libcfs]
[476681.008785] PGD 2e75067 PUD 33e9f9067 PMD 33e875067 PTE 80000002f06c4060
[476681.009522] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[476681.010175] Modules linked in: lustre(OE) ofd(OE) osp(OE) lod(OE) ost(OE) mdt(OE) mdd(OE) mgs(OE) osd_zfs(OE) lquota(OE) lfsck(OE) obdecho(OE) mgc(OE) lov(OE) mdc(OE) osc(OE) lmv(OE) fid(OE) fld(OE) ptlrpc_gss(OE) ptlrpc(OE) obdclass(OE) ksocklnd(OE) lnet(OE) libcfs(OE) zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) spl(O) zlib_deflate jbd2 syscopyarea sysfillrect sysimgblt ttm drm_kms_helper ata_generic drm pata_acpi i2c_piix4 pcspkr ata_piix virtio_balloon serio_raw i2c_core virtio_console libata virtio_blk floppy nfsd ip_tables rpcsec_gss_krb5 [last unloaded: libcfs]
[476681.018904] CPU: 12 PID: 2137 Comm: ll_ost_io06_002 Tainted: P           OE  ------------   3.10.0-debug #2
[476681.020320] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[476681.021084] task: ffff88029d2949c0 ti: ffff8802f1450000 task.ti: ffff8802f1450000
[476681.022819] RIP: 0010:[<ffffffffa020a170>]  [<ffffffffa020a170>] adler32_update+0x70/0x250 [libcfs]
[476681.024117] RSP: 0018:ffff8802f1453888  EFLAGS: 00010212
[476681.024773] RAX: 0000000000001000 RBX: 0000000000001000 RCX: ffffea000bc1b100
[476681.026257] RDX: 0000000000001000 RSI: ffff8802f06c4000 RDI: ffff8802f06c4000
[476681.027581] RBP: ffff8802f14538f0 R08: 0000000000000001 R09: 0000000000001000
[476681.029058] R10: 0000000000000000 R11: 0000000000000f40 R12: ffffea000bc1b102
[476681.030630] R13: 0000000000001000 R14: ffffffffa022c3d0 R15: 0000000000000001
[476681.032156] FS:  0000000000000000(0000) GS:ffff88033e580000(0000) knlGS:0000000000000000
[476681.041864] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[476681.042557] CR2: ffff8802f06c4000 CR3: 00000000ba661000 CR4: 00000000000006e0
[476681.043811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[476681.046746] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[476681.048311] Stack:
[476681.049038]  ffff8802d7789fd0 0000100000000000 ffff8802f06c4000 0000000000000000
[476681.051290]  0000100000000000 0000000000000000 000000006cf71350 ffff88033181cfc0
[476681.052826]  ffff8802f06c4000 ffffea000bc1b102 0000000000001000 ffffffffa022c3d0
[476681.064622] Call Trace:
[476681.065266]  [<ffffffff81333237>] crypto_shash_update+0x47/0x120
[476681.066002]  [<ffffffff8133355e>] shash_ahash_update+0x3e/0x70
[476681.066775]  [<ffffffff813335a2>] shash_async_update+0x12/0x20
[476681.067544]  [<ffffffffa0209143>] cfs_crypto_hash_update_page+0x93/0xc0 [libcfs]
[476681.069023]  [<ffffffffa0682ae6>] tgt_checksum_niobuf.isra.37+0x286/0x600 [ptlrpc]
[476681.073433]  [<ffffffffa068725f>] tgt_brw_read+0xc8f/0x1fa0 [ptlrpc]
[476681.074195]  [<ffffffff811cd4f9>] ? __kmalloc+0x649/0x660
[476681.074931]  [<ffffffff817063d7>] ? _raw_spin_unlock+0x27/0x40
[476681.078624]  [<ffffffff810e3201>] ? lockdep_init_map+0xa1/0x600
[476681.079394]  [<ffffffffa06233f7>] ? lustre_msg_add_version+0x27/0xa0 [ptlrpc]
[476681.080816]  [<ffffffffa062376c>] ? lustre_pack_reply_v2+0x16c/0x2a0 [ptlrpc]
[476681.082222]  [<ffffffffa0623912>] ? lustre_pack_reply_flags+0x72/0x1f0 [ptlrpc]
[476681.088457]  [<ffffffffa0623aa1>] ? lustre_pack_reply+0x11/0x20 [ptlrpc]
[476681.090318]  [<ffffffffa0689c8b>] tgt_request_handle+0x93b/0x13e0 [ptlrpc]
[476681.091110]  [<ffffffffa062ec21>] ptlrpc_server_handle_request+0x261/0xaf0 [ptlrpc]
[476681.092523]  [<ffffffffa06329d8>] ptlrpc_main+0xa58/0x1df0 [ptlrpc]
[476681.093298]  [<ffffffffa0631f80>] ? ptlrpc_register_service+0xeb0/0xeb0 [ptlrpc]
[476681.095017]  [<ffffffff810a2eba>] kthread+0xea/0xf0
[476681.095722]  [<ffffffff810a2dd0>] ? kthread_create_on_node+0x140/0x140
[476681.096469]  [<ffffffff8170fb98>] ret_from_fork+0x58/0x90
[476681.097167]  [<ffffffff810a2dd0>] ? kthread_create_on_node+0x140/0x140
[476681.098303] Code: 44 00 00 8b 5d b8 b8 b0 15 00 00 81 fb b0 15 00 00 0f 46 c3 29 45 b8 83 f8 0f 89 45 a4 0f 8e f8 00 00 00 48 8b 7d a8 89 45 bc 90 <44> 0f b6 2f 44 0f b6 77 01 48 83 c7 10 44 0f b6 67 f2 0f b6 5f 
[476681.101124] RIP  [<ffffffffa020a170>] adler32_update+0x70/0x250 [libcfs]
[476681.101979]  RSP <ffff8802f1453888>
[476681.102719] CR2: ffff8802f06c4000