INFO: task syz-executor.2:8817 blocked for more than 143 seconds. Not tainted 5.12.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24016 pid: 8817 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8b8/0x2180 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 wb_wait_for_completion+0x15a/0x200 fs/fs-writeback.c:209 sync_inodes_sb+0x18b/0x8a0 fs/fs-writeback.c:2577 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x10b/0x1f0 fs/sync.c:48 generic_shutdown_super+0x64/0x320 fs/super.c:448 kill_block_super+0x90/0xd0 fs/super.c:1394 deactivate_locked_super+0x7b/0x130 fs/super.c:335 cleanup_mnt+0x326/0x4c0 fs/namespace.c:1136 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466ce7 RSP: 002b:00007ffc5c335b58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ce7 RDX: 00007ffc5c335c29 RSI: 0000000000000002 RDI: 00007ffc5c335c20 RBP: 00007ffc5c335c20 R08: 00000000ffffffff R09: 00007ffc5c3359f0 R10: 0000000001da58e3 R11: 0000000000000246 R12: 00000000004ae4e4 R13: 00007ffc5c336cd0 R14: 0000000001da5810 R15: 0000000000000002 INFO: task syz-executor.5:8821 blocked for more than 143 seconds. Not tainted 5.12.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:24312 pid: 8821 ppid: 8819 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8b8/0x2180 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 wb_wait_for_completion+0x15a/0x200 fs/fs-writeback.c:209 sync_inodes_sb+0x18b/0x8a0 fs/fs-writeback.c:2577 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x10b/0x1f0 fs/sync.c:48 generic_shutdown_super+0x64/0x320 fs/super.c:448 kill_block_super+0x90/0xd0 fs/super.c:1394 deactivate_locked_super+0x7b/0x130 fs/super.c:335 cleanup_mnt+0x326/0x4c0 fs/namespace.c:1136 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466ce7 RSP: 002b:00007fff0f541af8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ce7 RDX: 00007fff0f541bc9 RSI: 0000000000000002 RDI: 00007fff0f541bc0 RBP: 00007fff0f541bc0 R08: 00000000ffffffff R09: 00007fff0f541990 R10: 0000000001f818e3 R11: 0000000000000246 R12: 00000000004ae4e4 R13: 00007fff0f542c70 R14: 0000000001f81810 R15: 0000000000000002 Showing all locks held in the system: 2 locks held by kworker/u4:1/24: 2 locks held by kworker/u4:2/37: #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888141524938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x771/0x13d0 kernel/workqueue.c:2246 #1: ffffc90000e2fdb0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13d0 kernel/workqueue.c:2250 1 lock held by khungtaskd/1673: #0: ffffffff8a98b040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8074: #0: ffff888010242ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:961 2 locks held by syz-executor.2/8817: #0: ffff8880177360e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0x5f/0x80 fs/super.c:365 #1: ffff888144304708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff888144304708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x171/0x8a0 fs/fs-writeback.c:2575 2 locks held by syz-executor.5/8821: #0: ffff8880295620e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0x5f/0x80 fs/super.c:365 #1: ffff888017a16708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline] #1: ffff888017a16708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x171/0x8a0 fs/fs-writeback.c:2575 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1673 Comm: khungtaskd Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x93/0xc2 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x2d/0xac lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x9cf/0xc00 kernel/hung_task.c:294 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy7 ieee80211_iface_work RIP: 0010:ieee80211_update_bss_from_elems+0x8c9/0xdf0 net/mac80211/scan.c:119 Code: 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 3d 04 00 00 f6 45 47 04 0f 84 2d fa ff ff 48 b8 00 00 00 00 00 fc ff df <4c> 89 e2 48 c1 ea 03 0f b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 RSP: 0018:ffffc90000cd72e8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: ffffc90000cd7380 RCX: 1ffff1100507f19f RDX: 0000000000000007 RSI: ffff88802350d493 RDI: ffff8880283f8d0f RBP: ffff8880283f8cc8 R08: 0000000000000004 R09: ffff8880283f8cdd R10: ffffed100507f19b R11: 0000000000000001 R12: ffffc90000cd7542 R13: ffff8880138e9b68 R14: ffff8880231c8d00 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6c2be26028 CR3: 0000000010a70000 CR4: 0000000000350ef0 Call Trace: ieee80211_bss_info_update+0x3d1/0x8c0 net/mac80211/scan.c:221 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0x7da/0x15d0 net/mac80211/ibss.c:1615 ieee80211_ibss_rx_queued_mgmt+0xb55/0x1350 net/mac80211/ibss.c:1642 ieee80211_iface_work+0x54e/0x7e0 net/mac80211/iface.c:1439 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294