Hello, syzbot found the following issue on: HEAD commit: 8ab774587903 Merge tag 'trace-v5.16-5' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12a6b6d1b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6c3ab72998e7f1a4 dashboard link: https://syzkaller.appspot.com/bug?extid=76629376e06e2c2ad626 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+76629376e06e2c2ad626@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task kworker/1:4:7960 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:23576 pid: 7960 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 usb_kill_urb+0x1d5/0x310 drivers/usb/core/urb.c:720 usb_start_wait_urb+0x265/0x530 drivers/usb/core/message.c:64 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2a5/0x4b0 drivers/usb/core/message.c:153 hub_port_init+0x9f1/0x2df0 drivers/usb/core/hub.c:4829 hub_port_connect+0xcf8/0x27d0 drivers/usb/core/hub.c:5280 hub_port_connect_change+0x5f9/0xc20 drivers/usb/core/hub.c:5488 port_event+0xb67/0x1220 drivers/usb/core/hub.c:5634 hub_event+0x4ed/0xe40 drivers/usb/core/hub.c:5716 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 </TASK> Showing all locks held in the system: 3 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/27: #0: ffffffff8cd1da80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by in:imklog/6200: #0: ffff8880715914f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by agetty/6229: #0: ffff888024550098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900028dc2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113 5 locks held by kworker/1:4/7960: #0: ffff888016717538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9000c1bfd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2273 #2: ffff888147758220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff888147758220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b2/0xe40 drivers/usb/core/hub.c:5662 #3: ffff88814775c5c0 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3086 [inline] #3: ffff88814775c5c0 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xce1/0x27d0 drivers/usb/core/hub.c:5279 #4: ffff888147701168 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ef/0x2df0 drivers/usb/core/hub.c:4703 1 lock held by syz-executor.0/16819: 2 locks held by syz-executor.4/16820: 1 lock held by syz-executor.1/16824: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc82/0xcd0 kernel/hung_task.c:295 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16715 Comm: kworker/u4:4 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy8 ieee80211_iface_work RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:50 [inline] RIP: 0010:__unwind_start+0x61a/0x750 arch/x86/kernel/unwind_orc.c:709 Code: e8 5b 79 95 00 48 8b 44 24 10 48 39 03 0f 83 d4 fa ff ff 4c 89 f7 e8 35 da ff ff 48 b8 00 00 00 00 00 fc ff df 0f b6 44 05 00 <84> c0 75 2d 41 83 3e 00 0f 85 38 ff ff ff e9 aa fa ff ff 44 89 f1 RSP: 0018:ffffc90001b3f3b8 EFLAGS: 00000292 RAX: 0000000000000000 RBX: ffffc90001b3f458 RCX: 0000000080000000 RDX: ffffc90001b3f3b8 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 1ffff92000367e84 R08: dffffc0000000000 R09: ffffc90001b3f470 R10: fffff52000367e90 R11: 0000000000000000 R12: 1ffff92000367e86 R13: ffffc90001b38000 R14: ffffc90001b3f420 R15: ffffc90001b3f428 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd4386b03a4 CR3: 000000003a2bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <TASK> unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xdc/0x140 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x9d/0x330 mm/slub.c:3261 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] ieee802_11_parse_elems_crc+0xc7/0x1040 net/mac80211/util.c:1471 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2208 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1605 [inline] ieee80211_ibss_rx_queued_mgmt+0x389/0x2b30 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1466 [inline] ieee80211_iface_work+0x709/0xc90 net/mac80211/iface.c:1520 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 </TASK> ---------------- Code disassembly (best guess): 0: e8 5b 79 95 00 callq 0x957960 5: 48 8b 44 24 10 mov 0x10(%rsp),%rax a: 48 39 03 cmp %rax,(%rbx) d: 0f 83 d4 fa ff ff jae 0xfffffae7 13: 4c 89 f7 mov %r14,%rdi 16: e8 35 da ff ff callq 0xffffda50 1b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 22: fc ff df 25: 0f b6 44 05 00 movzbl 0x0(%rbp,%rax,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 75 2d jne 0x5b 2e: 41 83 3e 00 cmpl $0x0,(%r14) 32: 0f 85 38 ff ff ff jne 0xffffff70 38: e9 aa fa ff ff jmpq 0xfffffae7 3d: 44 89 f1 mov %r14d,%ecx --- This report is generated by a bot. 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