Hello Nic,
When I reran the libiscsi test suite against your for-next branch a kernel oops
appeared in the system log that I hadn't seen before. There are no iSCSI patches
from me on that branch so this crash was likely introduced by one of the iSCSI
target driver patches that were added to your for-next branch after kernel v4.11
was released. The topmost commit in the kernel tree that triggered this oops is
commit acdd4716bc86 ("target: reject COMPARE_AND_WRITE if emulate_caw is not set").
[ 321.546438] iscsi_target_mod:lio_release_cmd: Entering lio_release_cmd for se_cmd: ffff880063134890
[ 323.013563] 1 connection(s) still exist for iSCSI session to iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-test-2
[ 323.014358] ------------[ cut here ]------------
[ 323.014864] kernel BUG at drivers/target/iscsi/iscsi_target.c:4346!
[ 323.015339] invalid opcode: 0000 [#1] SMP
[ 323.015730] Modules linked in: target_core_user uio target_core_iblock target_core_file iscsi_target_mod target_core_mod brd netconsole configfs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
aesni_intel aes_x86_64 crypto_simd cryptd glue_helper serio_raw virtio_rng virtio_console virtio_balloon i2c_piix4 button acpi_cpufreq iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ext4 jbd2
mbcache virtio_blk virtio_net floppy psmouse virtio_pci
[ 323.018009] CPU: 1 PID: 2292 Comm: iscsi_ttx Tainted: G W 4.12.0-rc1-dbg+ #1
[ 323.018669] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
[ 323.019139] task: ffff8801381b27c0 task.stack: ffffc90002a98000
[ 323.019428] RIP: 0010:iscsit_close_session+0x1fd/0x200 [iscsi_target_mod]
[ 323.019705] RSP: 0018:ffffc90002a9bd68 EFLAGS: 00010296
[ 323.019960] RAX: 0000000000000066 RBX: ffff880067a412a8 RCX: 0000000000000006
[ 323.020243] RDX: 0000000000000007 RSI: 0000000000000001 RDI: ffff88013fc8ce80
[ 323.020525] RBP: ffffc90002a9bd80 R08: 0000000000000001 R09: 0000000000000000
[ 323.020808] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880138edb3f8
[ 323.021092] R13: ffff880067a412a8 R14: 000000000000000f R15: 0000000000000005
[ 323.021376] FS: 0000000000000000(0000) GS:ffff88013fc80000(0000) knlGS:0000000000000000
[ 323.021820] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 323.022082] CR2: 00007f9d1a3ab020 CR3: 0000000069ce8000 CR4: 00000000001406e0
[ 323.022364] Call Trace:
[ 323.022646] iscsit_logout_post_handler+0xb3/0x200 [iscsi_target_mod]
[ 323.022925] iscsit_response_queue+0x3b5/0x7b0 [iscsi_target_mod]
[ 323.024217] iscsi_target_tx_thread+0x11b/0x1e0 [iscsi_target_mod]
[ 323.024998] kthread+0x109/0x140
[ 323.025742] ret_from_fork+0x31/0x40
[ 323.025970] Code: 00 00 00 00 00 48 89 df e8 c1 e0 fe ff e9 54 ff ff ff 8b b7 10 01 00 00 48 8b 97 08 04 00 00 48 c7 c7 b0 0d 25 a0 e8 73 84 ee e0 <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 4c 8d af
60 01 00 00 41
[ 323.026680] RIP: iscsit_close_session+0x1fd/0x200 [iscsi_target_mod] RSP: ffffc90002a9bd68
[ 323.027126] ---[ end trace 460f7ed74ba9e280 ]---
(gdb) list *(iscsit_close_session+0x1fd)
0x18d0d is in iscsit_close_session (drivers/target/iscsi/iscsi_target.c:4343).
4338 {
4339 struct iscsi_portal_group *tpg = sess->tpg;
4340 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4341
4342 if (atomic_read(&sess->nconn)) {
4343 pr_err("%d connection(s) still exist for iSCSI session"
4344 " to %s\n", atomic_read(&sess->nconn),
4345 sess->sess_ops->InitiatorName);
4346 BUG();
4347 }
Bart.--
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