INFO: task syz-executor.2:7618 blocked for more than 143 seconds. Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28456 pid: 7618 ppid: 3630 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4995 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6304 schedule+0xd2/0x260 kernel/sched/core.c:6377 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6436 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x1250 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f160432bf64 RSP: 002b:00007f1602cedca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f160448bf60 RCX: 00007f160432bf64 RDX: 0000000000000002 RSI: 00007f1602cedd40 RDI: 00000000ffffff9c RBP: 00007f1602cedd40 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007f16049bfb1f R14: 00007f1602cee300 R15: 0000000000022000 INFO: task syz-executor.1:7678 blocked for more than 143 seconds. Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28456 pid: 7678 ppid: 3628 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4995 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6304 schedule+0xd2/0x260 kernel/sched/core.c:6377 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6436 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x1250 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f92ad339f64 RSP: 002b:00007f92abcfbca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f92ad499f60 RCX: 00007f92ad339f64 RDX: 0000000000000002 RSI: 00007f92abcfbd40 RDI: 00000000ffffff9c RBP: 00007f92abcfbd40 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007f92ad9cdb1f R14: 00007f92abcfc300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb84ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 2 locks held by getty/3277: #0: ffff88814ac25098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b662e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2075 3 locks held by syz-executor.4/7598: 1 lock held by syz-executor.2/7618: #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 1 lock held by syz-executor.1/7678: #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 1 lock held by syz-executor.0/7896: #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 1 lock held by syz-executor.5/8471: #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline] #0: ffffffff8c5b2668 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 90 Comm: kworker/u4:3 Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy6 ieee80211_iface_work RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:981 [inline] RIP: 0010:debug_check_no_obj_freed+0xe2/0x420 lib/debugobjects.c:1023 Code: 48 89 44 24 30 48 8b 7c 24 10 e8 49 ad 6b 05 48 89 44 24 28 48 8b 44 24 30 80 38 00 0f 85 33 03 00 00 48 8b 44 24 20 4c 8b 00 <4d> 85 c0 0f 84 59 02 00 00 49 bd 22 01 00 00 00 00 ad de 4c 89 c0 RSP: 0018:ffffc90001a9fae0 EFLAGS: 00000046 RAX: ffffffff90740378 RBX: ffff88805fabb800 RCX: ffffffff815e06b0 RDX: 1ffffffff20e8072 RSI: 0000000000000004 RDI: ffffc90001a9fa50 RBP: ffff888010c41c80 R08: 0000000000000000 R09: 0000000000000003 R10: fffff52000353f4a R11: 0000000000000001 R12: 1ffffffff20e806f R13: ffff88805fabb800 R14: dead000000000100 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000b21000 CR3: 000000000b88e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_free_hook mm/slub.c:1703 [inline] slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xd0/0x390 mm/slub.c:4562 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x630/0x760 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] kfree_skb_reason.part.0+0xc3/0x2f0 net/core/skbuff.c:776 kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279 kfree_skb include/linux/skbuff.h:1114 [inline] ieee80211_iface_work+0x413/0xd00 net/mac80211/iface.c:1583 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 48 89 44 24 30 mov %rax,0x30(%rsp) 5: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi a: e8 49 ad 6b 05 callq 0x56bad58 f: 48 89 44 24 28 mov %rax,0x28(%rsp) 14: 48 8b 44 24 30 mov 0x30(%rsp),%rax 19: 80 38 00 cmpb $0x0,(%rax) 1c: 0f 85 33 03 00 00 jne 0x355 22: 48 8b 44 24 20 mov 0x20(%rsp),%rax 27: 4c 8b 00 mov (%rax),%r8 * 2a: 4d 85 c0 test %r8,%r8 <-- trapping instruction 2d: 0f 84 59 02 00 00 je 0x28c 33: 49 bd 22 01 00 00 00 movabs $0xdead000000000122,%r13 3a: 00 ad de 3d: 4c 89 c0 mov %r8,%rax