syzbot has found a reproducer for the following issue on: HEAD commit: 8d20dcda404d selftests: drv-net-hw: inject pp_alloc_fail e.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=13ff9fc4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c30f048a4f12891 dashboard link: https://syzkaller.appspot.com/bug?extid=5b9196ecf74447172a9a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ff9fc4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13ca3a18580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5ce07c743ced/disk-8d20dcda.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/66f2a9a35d5e/vmlinux-8d20dcda.xz kernel image: https://storage.googleapis.com/syzbot-assets/4c790c086a46/bzImage-8d20dcda.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5b9196ecf74447172a9a@xxxxxxxxxxxxxxxxxxxxxxxxx bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc7-syzkaller-01131-g8d20dcda404d #0 Not tainted ------------------------------------------------------ kworker/u8:6/1143 is trying to acquire lock: ffffffff8fcb4a08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_acquire_if_cleanup_net net/core/dev.c:10281 [inline] ffffffff8fcb4a08 (rtnl_mutex){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0xac2/0x2030 net/core/dev.c:11783 but task is already holding lock: ffff888027260768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6034 [inline] ffff888027260768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ieee80211_remove_interfaces+0x129/0x700 net/mac80211/iface.c:2276 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rdev->wiphy.mtx){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 wiphy_lock include/net/cfg80211.h:6019 [inline] wiphy_register+0x1a49/0x27b0 net/wireless/core.c:1006 ieee80211_register_hw+0x30fb/0x3e10 net/mac80211/main.c:1582 mac80211_hwsim_new_radio+0x2a9f/0x4a90 drivers/net/wireless/virtual/mac80211_hwsim.c:5558 init_mac80211_hwsim+0x87a/0xb00 drivers/net/wireless/virtual/mac80211_hwsim.c:6910 do_one_initcall+0x248/0x870 init/main.c:1266 do_initcall_level+0x157/0x210 init/main.c:1328 do_initcalls+0x3f/0x80 init/main.c:1344 kernel_init_freeable+0x435/0x5d0 init/main.c:1577 kernel_init+0x1d/0x2b0 init/main.c:1466 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (rtnl_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 rtnl_acquire_if_cleanup_net net/core/dev.c:10281 [inline] unregister_netdevice_many_notify+0xac2/0x2030 net/core/dev.c:11783 unregister_netdevice_many net/core/dev.c:11866 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11732 unregister_netdevice include/linux/netdevice.h:3320 [inline] _cfg80211_unregister_wdev+0x163/0x590 net/wireless/core.c:1251 ieee80211_remove_interfaces+0x4ef/0x700 net/mac80211/iface.c:2301 ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1676 mac80211_hwsim_del_radio+0x2c4/0x4c0 drivers/net/wireless/virtual/mac80211_hwsim.c:5664 hwsim_exit_net+0x5c1/0x670 drivers/net/wireless/virtual/mac80211_hwsim.c:6544 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x812/0xd60 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rdev->wiphy.mtx); lock(rtnl_mutex); lock(&rdev->wiphy.mtx); lock(rtnl_mutex); *** DEADLOCK *** 4 locks held by kworker/u8:6/1143: #0: ffff88801baf5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88801baf5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc900041ffd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc900041ffd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 #2: ffffffff8fca8290 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17a/0xd60 net/core/net_namespace.c:606 #3: ffff888027260768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6034 [inline] #3: ffff888027260768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ieee80211_remove_interfaces+0x129/0x700 net/mac80211/iface.c:2276 stack backtrace: CPU: 0 UID: 0 PID: 1143 Comm: kworker/u8:6 Not tainted 6.13.0-rc7-syzkaller-01131-g8d20dcda404d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: netns cleanup_net Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 rtnl_acquire_if_cleanup_net net/core/dev.c:10281 [inline] unregister_netdevice_many_notify+0xac2/0x2030 net/core/dev.c:11783 unregister_netdevice_many net/core/dev.c:11866 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11732 unregister_netdevice include/linux/netdevice.h:3320 [inline] _cfg80211_unregister_wdev+0x163/0x590 net/wireless/core.c:1251 ieee80211_remove_interfaces+0x4ef/0x700 net/mac80211/iface.c:2301 ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1676 mac80211_hwsim_del_radio+0x2c4/0x4c0 drivers/net/wireless/virtual/mac80211_hwsim.c:5664 hwsim_exit_net+0x5c1/0x670 drivers/net/wireless/virtual/mac80211_hwsim.c:6544 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x812/0xd60 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- 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.
