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Message-ID: <696d635d.a70a0220.34546f.0350.GAE@google.com>
Date: Sun, 18 Jan 2026 14:49:01 -0800
From: syzbot <syzbot+8bb3e2bee8a429cc76dd@...kaller.appspotmail.com>
To: kapoorarnav43@...il.com, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_execve (6)
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: workqueue lockup
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 141s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x100
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=6 refcnt=7
pending: 3*nsim_dev_hwstats_traffic_work, psi_avgs_work, vmstat_shepherd, ovs_dp_masks_rebalance
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=4 refcnt=5
in-flight: 5940:nsim_fib_event_work nsim_fib_event_work ,39:nsim_fib_event_work nsim_fib_event_work
workqueue events_long: flags=0x100
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=4 refcnt=5
pending: 4*defense_work_handler
workqueue events_unbound: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
in-flight: 3887:toggle_allocation_gate
pending: flush_memcg_stats_dwork
workqueue events_unbound: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=8 refcnt=9
in-flight: 60:cfg80211_wiphy_work ,3910:nsim_dev_trap_report_work ,1136:nsim_dev_trap_report_work ,4325:nsim_dev_trap_report_work ,3517:cfg80211_wiphy_work ,1101:nsim_dev_trap_report_work ,3469:crng_reseed
pending: nsim_dev_trap_report_work
workqueue events_freezable: flags=0x104
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: update_balloon_stats_func
workqueue events_power_efficient: flags=0x180
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=8 refcnt=9
in-flight: 794:reg_check_chans_work
pending: neigh_managed_work, neigh_periodic_work, 2*check_lifetime, do_cache_clean, 2*check_lifetime
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
in-flight: 5865:neigh_periodic_work ,24:gc_worker
workqueue kvfree_rcu_reclaim: flags=0xa
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
in-flight: 1013:kfree_rcu_monitor
pending: kfree_rcu_monitor
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
in-flight: 1141:kfree_rcu_monitor
workqueue mm_percpu_wq: flags=0x8
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
in-flight: 4346:wb_workfn
workqueue kblockd: flags=0x18
pwq 3: cpus=0 node=0 flags=0x0 nice=-20 active=1 refcnt=2
pending: blk_mq_run_work_fn
pwq 7: cpus=1 node=0 flags=0x0 nice=-20 active=2 refcnt=3
pending: blk_mq_timeout_work, blk_mq_requeue_work
workqueue ipv6_addrconf: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=231
in-flight: 340:addrconf_dad_work
inactive: 221*addrconf_dad_work, addrconf_verify_work, addrconf_dad_work, 4*addrconf_verify_work
workqueue krxrpcd: flags=0x2001a
pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=9
pending: rxrpc_peer_keepalive_worker
inactive: 5*rxrpc_peer_keepalive_worker
workqueue bat_events: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=40
pending: batadv_mcast_mla_update
inactive: 4*batadv_mcast_mla_update, 7*batadv_iv_send_outstanding_bat_ogm_packet, 5*batadv_purge_orig, 5*batadv_iv_send_outstanding_bat_ogm_packet, 5*batadv_tt_purge, batadv_dat_purge, 2*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
workqueue hci0: flags=0x20012
pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=4
pending: hci_conn_timeout
workqueue hci2: flags=0x20012
pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=4
pending: hci_conn_timeout
workqueue wg-kex-wg0: flags=0x124
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
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 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
in-flight: 9:wg_packet_tx_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
in-flight: 5963:wg_packet_tx_worker
pending: wg_packet_encrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=5 refcnt=6
in-flight: 6465:wg_packet_encrypt_worker wg_packet_encrypt_worker ,5964:wg_packet_tx_worker wg_packet_tx_worker
pending: wg_packet_decrypt_worker
workqueue wg-kex-wg0: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=3 refcnt=4
in-flight: 1045:wg_packet_handshake_send_worker ,13:wg_packet_handshake_send_worker wg_packet_handshake_send_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
pool 2: cpus=0 node=0 flags=0x0 nice=0 hung=64s workers=6 idle: 5889 5941 10
pool 6: cpus=1 node=0 flags=0x2 nice=0 hung=65s workers=7 manager: 128
pool 8: cpus=0-1 flags=0x6 nice=0 hung=65s workers=18 manager: 36 idle: 12 1341 50
Showing backtraces of running workers in stalled CPU-bound worker pools:
Tested on:
commit: f40ddcc0 Revert "nfc/nci: Add the inconsistency check ..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=15a7db9a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=323fe5bdde2384a5
dashboard link: https://syzkaller.appspot.com/bug?extid=8bb3e2bee8a429cc76dd
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=143ff522580000
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