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782373ba27
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Hannes Reinecke 782373ba27 nvme: tcp: avoid race between queue_lock lock and destroy 
Commit 76d54bf20c ("nvme-tcp: don't access released socket during
error recovery") added a mutex_lock() call for the queue->queue_lock
in nvme_tcp_get_address(). However, the mutex_lock() races with
mutex_destroy() in nvme_tcp_free_queue(), and causes the WARN below.

DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 3 PID: 34077 at kernel/locking/mutex.c:587 __mutex_lock+0xcf0/0x1220
Modules linked in: nvmet_tcp nvmet nvme_tcp nvme_fabrics iw_cm ib_cm ib_core pktcdvd nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables qrtr sunrpc ppdev 9pnet_virtio 9pnet pcspkr netfs parport_pc parport e1000 i2c_piix4 i2c_smbus loop fuse nfnetlink zram bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper xfs drm sym53c8xx floppy nvme scsi_transport_spi nvme_core nvme_auth serio_raw ata_generic pata_acpi dm_multipath qemu_fw_cfg [last unloaded: ib_uverbs]
CPU: 3 UID: 0 PID: 34077 Comm: udisksd Not tainted 6.11.0-rc7 #319
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014
RIP: 0010:__mutex_lock+0xcf0/0x1220
Code: 08 84 d2 0f 85 c8 04 00 00 8b 15 ef b6 c8 01 85 d2 0f 85 78 f4 ff ff 48 c7 c6 20 93 ee af 48 c7 c7 60 91 ee af e8 f0 a7 6d fd <0f> 0b e9 5e f4 ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1
RSP: 0018:ffff88811305f760 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88812c652058 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffff88811305f8b0 R08: 0000000000000001 R09: ffffed1075c36341
R10: ffff8883ae1b1a0b R11: 0000000000010498 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88812c652058
FS:  00007f9713ae4980(0000) GS:ffff8883ae180000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd78483c7c CR3: 0000000122c38000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ? __warn.cold+0x5b/0x1af
 ? __mutex_lock+0xcf0/0x1220
 ? report_bug+0x1ec/0x390
 ? handle_bug+0x3c/0x80
 ? exc_invalid_op+0x13/0x40
 ? asm_exc_invalid_op+0x16/0x20
 ? __mutex_lock+0xcf0/0x1220
 ? nvme_tcp_get_address+0xc2/0x1e0 [nvme_tcp]
 ? __pfx___mutex_lock+0x10/0x10
 ? __lock_acquire+0xd6a/0x59e0
 ? nvme_tcp_get_address+0xc2/0x1e0 [nvme_tcp]
 nvme_tcp_get_address+0xc2/0x1e0 [nvme_tcp]
 ? __pfx_nvme_tcp_get_address+0x10/0x10 [nvme_tcp]
 nvme_sysfs_show_address+0x81/0xc0 [nvme_core]
 dev_attr_show+0x42/0x80
 ? __asan_memset+0x1f/0x40
 sysfs_kf_seq_show+0x1f0/0x370
 seq_read_iter+0x2cb/0x1130
 ? rw_verify_area+0x3b1/0x590
 ? __mutex_lock+0x433/0x1220
 vfs_read+0x6a6/0xa20
 ? lockdep_hardirqs_on+0x78/0x100
 ? __pfx_vfs_read+0x10/0x10
 ksys_read+0xf7/0x1d0
 ? __pfx_ksys_read+0x10/0x10
 ? __x64_sys_openat+0x105/0x1d0
 do_syscall_64+0x93/0x180
 ? lockdep_hardirqs_on_prepare+0x16d/0x400
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on+0x78/0x100
 ? do_syscall_64+0x9f/0x180
 ? __pfx_ksys_read+0x10/0x10
 ? lockdep_hardirqs_on_prepare+0x16d/0x400
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on+0x78/0x100
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on_prepare+0x16d/0x400
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on+0x78/0x100
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on_prepare+0x16d/0x400
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on+0x78/0x100
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on_prepare+0x16d/0x400
 ? do_syscall_64+0x9f/0x180
 ? lockdep_hardirqs_on+0x78/0x100
 ? do_syscall_64+0x9f/0x180
 ? do_syscall_64+0x9f/0x180
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9713f55cfa
Code: 55 48 89 e5 48 83 ec 20 48 89 55 e8 48 89 75 f0 89 7d f8 e8 e8 74 f8 ff 48 8b 55 e8 48 8b 75 f0 41 89 c0 8b 7d f8 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 2e 44 89 c7 48 89 45 f8 e8 42 75 f8 ff 48 8b
RSP: 002b:00007ffd7f512e70 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055c38f316859 RCX: 00007f9713f55cfa
RDX: 0000000000000fff RSI: 00007ffd7f512eb0 RDI: 0000000000000011
RBP: 00007ffd7f512e90 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 000055c38f317148
R13: 0000000000000000 R14: 00007f96f4004f30 R15: 000055c3b6b623c0
 </TASK>

The WARN is observed when the blktests test case nvme/014 is repeated
with tcp transport. It is rare, and 200 times repeat is required to
recreate in some test environments.

To avoid the WARN, check the NVME_TCP_Q_LIVE flag before locking
queue->queue_lock. The flag is cleared long time before the lock gets
destroyed.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
2024-10-03 12:14:35 -07:00
arch soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
block block: fix blk_rq_map_integrity_sg kernel-doc 2024-09-27 04:19:53 -06:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto KEYS: prevent NULL pointer dereference in find_asymmetric_key() 2024-09-20 19:49:49 +03:00
Documentation soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
drivers nvme: tcp: avoid race between queue_lock lock and destroy 2024-10-03 12:14:35 -07:00
fs Revert "binfmt_elf, coredump: Log the reason of the failed core dumps" 2024-09-26 11:39:02 -07:00
include soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
init Rust changes for v6.12 2024-09-25 10:25:40 -07:00
io_uring for-6.12/io_uring-20240922 2024-09-24 11:11:38 -07:00
ipc struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
kernel Revert "binfmt_elf, coredump: Log the reason of the failed core dumps" 2024-09-26 11:39:02 -07:00
lib for-6.12/block-20240925 2024-09-25 14:56:40 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm memblock: updates for 6.12-rc1 2024-09-25 11:35:19 -07:00
net Including fixes from netfilter. 2024-09-26 10:27:10 -07:00
rust Rust changes for v6.12 2024-09-25 10:25:40 -07:00
samples Landlock updates for v6.12-rc1 2024-09-24 10:40:11 -07:00
scripts Char/Misc and other driver changes for 6.12-rc1 2024-09-26 10:13:08 -07:00
security bpf-next-6.12-struct-fd 2024-09-24 14:54:26 -07:00
sound soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
tools Including fixes from netfilter. 2024-09-26 10:27:10 -07:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap Summary 2024-09-24 11:08:40 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Mark powerpc spufs as orphaned 2024-08-19 21:27:56 +10:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
Makefile Rust changes for v6.12 2024-09-25 10:25:40 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.