From: syzbot <syzbot+e6bb7c8bc275dfed69c1@syzkaller.appspotmail.com>
To: Dai.Ngo@oracle.com, cel@kernel.org, jlayton@kernel.org,
linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org,
neil@brown.name, netdev@vger.kernel.org, okorniev@redhat.com,
syzkaller-bugs@googlegroups.com, tom@talpey.com
Subject: [syzbot] [nfs?] possible deadlock in nfsd_file_cache_shutdown
Date: Thu, 05 Nov 2026 23:35:40 -0800 [thread overview]
Message-ID: <6aed834c.dadc8e63.45095.0004.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: c4ba1716853d net: atl1c: drop oversized RX frames instead ..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=10dad4a1580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d30e1495ee3ac817
dashboard link: https://syzkaller.appspot.com/bug?extid=e6bb7c8bc275dfed69c1
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1fbe24b1b049/disk-c4ba1716.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4142b610b0c3/vmlinux-c4ba1716.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2441af2219d1/bzImage-c4ba1716.xz
AI-generated root cause summary:
In drivers/block/nbd.c, nbd_genl_reconnect_sock_cb() incorrectly calls
sk_set_memalloc(sock->sk) while holding the mutex nsock->tx_lock.
sk_set_memalloc() invokes static_branch_inc(), which acquires cpus_read_lock()
(cpu_hotplug_lock). Because nsock->tx_lock is acquired during block I/O request
dispatch in nbd_queue_rq(), it is part of the direct memory reclaim (fs_reclaim)
dependency chain. Acquiring cpu_hotplug_lock under nsock->tx_lock inverts the
core MM locking hierarchy (cpu_hotplug_lock -> slab_mutex -> fs_reclaim),
creating an ABBA circular locking dependency that can lead to system deadlock.
full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=e6bb7c8bc275dfed69c1
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e6bb7c8bc275dfed69c1@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.4.1718/12980 is trying to acquire lock:
ffffffff90094cc0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:316 [inline]
ffffffff90094cc0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4673 [inline]
ffffffff90094cc0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:5011 [inline]
ffffffff90094cc0 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc_noprof+0x5f/0x600 mm/slub.c:5047
but task is already holding lock:
ffffffff900771b8 (slab_mutex){+.+.}-{4:4}, at: __kmem_cache_create_args+0x59/0x470 mm/slab_common.c:350
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #7 (slab_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
kmem_cache_destroy+0x73/0x180 mm/slab_common.c:565
nfsd_file_cache_shutdown+0x126/0x370 fs/nfsd/filecache.c:1063
nfsd_shutdown_generic fs/nfsd/nfssvc.c:293 [inline]
nfsd_startup_net fs/nfsd/nfssvc.c:411 [inline]
nfsd_svc+0x539/0x710 fs/nfsd/nfssvc.c:788
nfsd_nl_threads_set_doit+0xa6c/0xc30 fs/nfsd/nfsctl.c:1780
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #6 (cpu_hotplug_lock){++++}-{0:0}:
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
cpus_read_lock+0x3d/0x160 kernel/cpu.c:490
static_key_slow_inc+0x12/0x30 kernel/jump_label.c:190
nbd_genl_reconnect_sock_cb+0x69a/0xbb0 drivers/block/nbd.c:1377
nbd_genl_foreach_sock+0x265/0x450 drivers/block/nbd.c:2152
nbd_genl_reconfigure+0xbbb/0x1040 drivers/block/nbd.c:2477
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #5 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
nbd_queue_rq+0x373/0xff0 drivers/block/nbd.c:1207
blk_mq_dispatch_rq_list+0x499/0x1990 block/blk-mq.c:2131
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xd36/0x1580 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_work_fn+0x167/0x2f0 block/blk-mq.c:2546
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #4 (&cmd->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
nbd_queue_rq+0xc1/0xff0 drivers/block/nbd.c:1199
blk_mq_dispatch_rq_list+0x499/0x1990 block/blk-mq.c:2131
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xd36/0x1580 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_work_fn+0x167/0x2f0 block/blk-mq.c:2546
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (set->srcu){.+.+}-{0:0}:
srcu_lock_sync include/linux/srcu.h:225 [inline]
__synchronize_srcu+0xca/0x2f0 kernel/rcu/srcutree.c:1662
elevator_switch+0x1e8/0x7b0 block/elevator.c:576
elevator_change+0x2fa/0x480 block/elevator.c:681
elevator_set_default+0x375/0x440 block/elevator.c:754
blk_register_queue+0x404/0x4f0 block/blk-sysfs.c:992
__add_disk+0x6b8/0xdb0 block/genhd.c:531
add_disk_fwnode+0x100/0x3a0 block/genhd.c:600
add_disk include/linux/blkdev.h:801 [inline]
nbd_dev_add+0x733/0xb60 drivers/block/nbd.c:2026
nbd_init+0x168/0x1f0 drivers/block/nbd.c:2743
do_one_initcall+0x250/0x870 init/main.c:1419
do_initcall_level+0x10a/0x1a0 init/main.c:1481
do_initcalls+0x59/0xa0 init/main.c:1497
kernel_init_freeable+0x29d/0x3e0 init/main.c:1732
kernel_init+0x22/0x1d0 init/main.c:1622
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&q->elevator_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
elevator_change+0x1af/0x480 block/elevator.c:679
elevator_set_none+0xb5/0x140 block/elevator.c:769
blk_mq_elv_switch_none block/blk-mq.c:5114 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:5159 [inline]
blk_mq_update_nr_hw_queues+0x5ef/0x19e0 block/blk-mq.c:5224
nbd_start_device+0x189/0xb30 drivers/block/nbd.c:1530
nbd_genl_connect+0x167d/0x1cd0 drivers/block/nbd.c:2310
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&q->q_usage_counter(io)#49){++++}-{0:0}:
blk_alloc_queue+0x544/0x690 block/blk-core.c:505
blk_mq_alloc_queue block/blk-mq.c:4439 [inline]
__blk_mq_alloc_disk+0x194/0x390 block/blk-mq.c:4486
nbd_dev_add+0x494/0xb60 drivers/block/nbd.c:1996
nbd_init+0x168/0x1f0 drivers/block/nbd.c:2743
do_one_initcall+0x250/0x870 init/main.c:1419
do_initcall_level+0x10a/0x1a0 init/main.c:1481
do_initcalls+0x59/0xa0 init/main.c:1497
kernel_init_freeable+0x29d/0x3e0 init/main.c:1732
kernel_init+0x22/0x1d0 init/main.c:1622
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3209 [inline]
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
__fs_reclaim_acquire mm/page_alloc.c:4360 [inline]
fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4374
might_alloc include/linux/sched/mm.h:316 [inline]
slab_pre_alloc_hook mm/slub.c:4673 [inline]
slab_alloc_node mm/slub.c:5011 [inline]
kmem_cache_alloc_noprof+0x5f/0x600 mm/slub.c:5047
create_cache mm/slab_common.c:249 [inline]
__kmem_cache_create_args+0x30c/0x470 mm/slab_common.c:387
__kmem_cache_create include/linux/slab.h:402 [inline]
ieee80211s_init net/mac80211/mesh.c:28 [inline]
ieee80211_mesh_init_sdata+0x371/0x620 net/mac80211/mesh.c:1784
ieee80211_setup_sdata+0x858/0xc10 net/mac80211/iface.c:1980
ieee80211_if_change_type+0x141/0x940 net/mac80211/iface.c:2125
ieee80211_change_iface+0xdc/0x4b0 net/mac80211/cfg.c:275
rdev_change_virtual_intf net/wireless/rdev-ops.h:74 [inline]
cfg80211_change_iface+0x40f/0x9c0 net/wireless/util.c:1368
nl80211_set_interface+0x78e/0xaa0 net/wireless/nl80211.c:5252
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
fs_reclaim --> cpu_hotplug_lock --> slab_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(slab_mutex);
lock(cpu_hotplug_lock);
lock(slab_mutex);
lock(fs_reclaim);
*** DEADLOCK ***
locks held by syz.4.1718/12980: 4, last CPU#0:
#0: ffffffff914f05a8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff9148c2a0 (rtnl_mutex){+.+.}-{4:4}, at: nl80211_pre_doit+0x117/0xfa0 net/wireless/nl80211.c:20140
#2: ffff888067180800 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: wiphy_lock include/net/cfg80211.h:6974 [inline]
#2: ffff888067180800 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: nl80211_pre_doit+0x6b2/0xfa0 net/wireless/nl80211.c:20189
#3: ffffffff900771b8 (slab_mutex){+.+.}-{4:4}, at: __kmem_cache_create_args+0x59/0x470 mm/slab_common.c:350
stack backtrace:
CPU: 0 UID: 0 PID: 12980 Comm: syz.4.1718 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087
check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219
check_prev_add kernel/locking/lockdep.c:3209 [inline]
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
__fs_reclaim_acquire mm/page_alloc.c:4360 [inline]
fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4374
might_alloc include/linux/sched/mm.h:316 [inline]
slab_pre_alloc_hook mm/slub.c:4673 [inline]
slab_alloc_node mm/slub.c:5011 [inline]
kmem_cache_alloc_noprof+0x5f/0x600 mm/slub.c:5047
create_cache mm/slab_common.c:249 [inline]
__kmem_cache_create_args+0x30c/0x470 mm/slab_common.c:387
__kmem_cache_create include/linux/slab.h:402 [inline]
ieee80211s_init net/mac80211/mesh.c:28 [inline]
ieee80211_mesh_init_sdata+0x371/0x620 net/mac80211/mesh.c:1784
ieee80211_setup_sdata+0x858/0xc10 net/mac80211/iface.c:1980
ieee80211_if_change_type+0x141/0x940 net/mac80211/iface.c:2125
ieee80211_change_iface+0xdc/0x4b0 net/mac80211/cfg.c:275
rdev_change_virtual_intf net/wireless/rdev-ops.h:74 [inline]
cfg80211_change_iface+0x40f/0x9c0 net/wireless/util.c:1368
nl80211_set_interface+0x78e/0xaa0 net/wireless/nl80211.c:5252
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmsg net/socket.c:2801 [inline]
__do_sys_sendmsg net/socket.c:2806 [inline]
__se_sys_sendmsg net/socket.c:2804 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0223f9fb19
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0224f20028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0224226090 RCX: 00007f0223f9fb19
RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000080
RBP: 00007f0224037b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0224226128 R14: 00007f0224226090 R15: 00007ffe4f069ef8
</TASK>
---
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reply other threads:[~2026-11-06 7:35 UTC|newest]
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