From: syzbot <syzbot+d7795c8487ca4e20ed88@syzkaller.appspotmail.com>
To: dakr@kernel.org, driver-core@lists.linux.dev,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
mcgrof@kernel.org, rafael@kernel.org, russ.weight@linux.dev,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] [kernel?] BUG: workqueue lockup in request_firmware_work_func
Date: Thu, 17 Sep 2026 16:12:29 -0700 [thread overview]
Message-ID: <6aac73dd.b398a7c9.1f86be.0026.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 5445d6419962 arm64: Don't read GMID_EL1 when MTE is disabled
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15bff5f9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c
dashboard link: https://syzkaller.appspot.com/bug?extid=d7795c8487ca4e20ed88
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17fa7e15580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=141208c9580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8b70e3bd109/disk-5445d641.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5227e56ac93/vmlinux-5445d641.xz
kernel image: https://storage.googleapis.com/syzbot-assets/54905f78be59/Image-5445d641.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d7795c8487ca4e20ed88@syzkaller.appspotmail.com
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 51s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x100
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=16 refcnt=17
in-flight: 9:request_firmware_work_func for 117s ,4770:nsim_fib_event_work for 72s
pending: 3*nsim_dev_hwstats_traffic_work, 2*psi_avgs_work, vmstat_shepherd, 6*ovs_dp_masks_rebalance, drm_fb_helper_damage_work, psi_avgs_work
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=5 refcnt=6
pending: 2*nsim_dev_hwstats_traffic_work, psi_avgs_work, free_obj_work, delayed_vfree_work
workqueue events_unbound: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=6 refcnt=7
in-flight: 1402:cfg80211_wiphy_work for 68s cfg80211_wiphy_work ,40:cfg80211_wiphy_work for 70s cfg80211_wiphy_work ,3330:cfg80211_wiphy_work for 72s cfg80211_wiphy_work
pwq 8: cpus=0-1 flags=0x6 nice=0 active=14 refcnt=15
in-flight: 183:linkwatch_event for 71s ,5008:nsim_dev_trap_report_work for 0s ,3000:cfg80211_wiphy_work for 72s cfg80211_wiphy_work ,1180:cfg80211_wiphy_work for 73s cfg80211_wiphy_work ,54:cfg80211_wiphy_work for 65s cfg80211_wiphy_work
pending: 2*nsim_dev_trap_report_work, toggle_allocation_gate, flush_memcg_stats_dwork, 2*nsim_dev_trap_report_work
workqueue events_power_efficient: flags=0x82
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
in-flight: 5009:reg_check_chans_work for 3s
pending: neigh_managed_work
pwq 8: cpus=0-1 flags=0x6 nice=0 active=6 refcnt=7
in-flight: 1188:neigh_periodic_work for 13s
pending: do_cache_clean, fb_flashcursor, neigh_periodic_work, wg_ratelimiter_gc_entries, gc_worker
workqueue events_dfl_long: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=8 refcnt=9
pending: 8*defense_work_handler
workqueue netns: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=4
in-flight: 58:cleanup_net for 75s
workqueue mm_percpu_wq: flags=0x108
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: vmstat_update
workqueue writeback: flags=0x4a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wb_workfn
workqueue gid-cache-wq: flags=0x20002
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=5
pending: netdevice_event_work_handler
inactive: update_gid_event_work_handler
workqueue mld: flags=0x40108
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=66
pending: mld_ifc_work
inactive: mld_dad_work, mld_ifc_work, 3*mld_dad_work, 11*mld_ifc_work, mld_dad_work, 2*mld_ifc_work, mld_dad_work, 6*mld_ifc_work, 2*mld_dad_work, 12*mld_ifc_work, mld_dad_work, 2*mld_ifc_work, mld_dad_work, 16*mld_ifc_work, 2*mld_dad_work, 2*mld_ifc_work
workqueue ipv6_addrconf: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=344
in-flight: 12:addrconf_dad_work for 73s
inactive: 340*addrconf_dad_work
workqueue bat_events: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=48 MAYDAY
in-flight: 2854(RESCUER):batadv_tt_purge for 4s
inactive: 2*batadv_tt_purge, batadv_mcast_mla_update, 3*batadv_purge_orig, 2*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, batadv_iv_send_outstanding_bat_ogm_packet, batadv_mcast_mla_update, 5*batadv_iv_send_outstanding_bat_ogm_packet, 2*batadv_purge_orig, 6*batadv_iv_send_outstanding_bat_ogm_packet, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_mcast_mla_update, 2*batadv_tt_purge, 3*batadv_mcast_mla_update
workqueue udp_tunnel_nic: flags=0x20002
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=6
pending: udp_tunnel_nic_device_sync_work
inactive: 2*udp_tunnel_nic_device_sync_work
workqueue wg-kex-wg0: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 4955:wg_packet_handshake_receive_worker for 15s
pending: wg_packet_handshake_receive_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg1: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
in-flight: 13:wg_packet_handshake_send_worker for 1s
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=3
in-flight: 4896(RESCUER):wg_packet_decrypt_worker for 0s
pending: mayday_cursor_func
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
in-flight: 26:wg_packet_handshake_receive_worker for 13s
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker, wg_packet_tx_worker
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg2: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_encrypt_worker, wg_packet_tx_worker
workqueue wg-kex-wg0: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 1092:wg_packet_handshake_receive_worker for 25s
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg0: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 4934:wg_packet_encrypt_worker for 25s wg_packet_encrypt_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 4840:wg_packet_handshake_receive_worker for 15s
pending: wg_packet_handshake_receive_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 24:wg_packet_handshake_receive_worker for 15s
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg2: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker, wg_packet_tx_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=4 MAYDAY
in-flight: 4914(RESCUER):wg_packet_encrypt_worker for 0s
pending: mayday_cursor_func
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_encrypt_worker, wg_packet_tx_worker
pool 2: cpus=0 node=0 flags=0x0 nice=0 hung=51s workers=8 idle: 10 1021 4469 4990 4941 4771
pool 6: cpus=1 node=0 flags=0x2 nice=0 hung=0s workers=7 manager: 866
pool 8: cpus=0-1 flags=0x6 nice=0 hung=0s workers=14 manager: 5010
Showing backtraces of busy workers in stalled worker pools:
pool 2:
task:kworker/0:0 state:R running task stack:0 pid:9 tgid:9 ppid:2 task_flags:0x4288060 flags:0x00000010
Workqueue: events request_firmware_work_func
Call trace:
__switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
rcu_read_unlock_sched include/linux/rcupdate.h:974 [inline]
pfn_valid+0x210/0x214 include/linux/mmzone.h:-1
lowmem_page_address include/linux/mm.h:3111 [inline]
__kasan_poison_pages+0x40/0x8c mm/kasan/common.c:151
kasan_poison_pages include/linux/kasan.h:118 [inline]
__free_pages_prepare mm/page_alloc.c:1440 [inline]
__free_frozen_pages+0x4e0/0xc18 mm/page_alloc.c:2962
free_frozen_pages+0x14/0x20 mm/page_alloc.c:2999
__free_slab+0x11c/0x1b4 mm/slub.c:3528
free_slab+0x2c/0x154 mm/slub.c:3562
discard_slab+0x48/0x90 mm/slub.c:3568
__slab_free+0x1a0/0x1d0 mm/slub.c:5815
___cache_free+0x80/0x94 mm/slub.c:6571
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0xb4/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x118/0x124 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x2c/0x88 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_noprof+0x2e8/0x6c8 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
kobject_get_path+0xbc/0x2a4 lib/kobject.c:161
kobject_uevent_env+0x264/0x944 lib/kobject_uevent.c:548
kobject_uevent+0x2c/0x3c lib/kobject_uevent.c:659
device_del+0x5f8/0x71c drivers/base/core.c:3983
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:134 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:172 [inline]
firmware_fallback_sysfs+0x330/0x930 drivers/base/firmware_loader/fallback.c:248
_request_firmware+0xb34/0xf5c drivers/base/firmware_loader/main.c:898
request_firmware_work_func+0xa4/0x24c drivers/base/firmware_loader/main.c:1162
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
kthread+0x304/0x3d4 kernel/kthread.c:436
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
pool 2:
task:kworker/0:4 state:R running task stack:0 pid:4770 tgid:4770 ppid:2 task_flags:0x4208060 flags:0x00000010
Workqueue: events nsim_fib_event_work
Call trace:
__switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0x13c/0x20c kernel/sched/core.c:7362
schedule_timeout+0x13c/0x28c kernel/time/sleep_timeout.c:99
schedule_timeout_uninterruptible+0x78/0xbc kernel/time/sleep_timeout.c:158
msleep+0x3c/0x68 kernel/time/sleep_timeout.c:318
nsim_fib6_rt_add drivers/net/netdevsim/fib.c:693 [inline]
nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:759 [inline]
nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline]
nsim_fib_event+0x57a0/0x60c4 drivers/net/netdevsim/fib.c:889
nsim_fib_event_work+0x1d8/0x320 drivers/net/netdevsim/fib.c:1493
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
kthread+0x304/0x3d4 kernel/kthread.c:436
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
reply other threads:[~2026-09-17 23:12 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6aac73dd.b398a7c9.1f86be.0026.GAE@google.com \
--to=syzbot+d7795c8487ca4e20ed88@syzkaller.appspotmail.com \
--cc=dakr@kernel.org \
--cc=driver-core@lists.linux.dev \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mcgrof@kernel.org \
--cc=rafael@kernel.org \
--cc=russ.weight@linux.dev \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®