INFO: task syz.1.16:6053 blocked for more than 144 seconds. Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.16 state:D stack:27096 pid:6053 tgid:6051 ppid:5930 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752 blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 blkdev_common_ioctl+0xe7b/0x2480 block/ioctl.c:622 blkdev_ioctl+0x4ca/0x6a0 block/ioctl.c:687 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f05a717e719 RSP: 002b:00007f05a7f80038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f05a7336058 RCX: 00007f05a717e719 RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004 RBP: 00007f05a71f139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f05a7336058 R15: 00007fffd2a22d68 Showing all locks held in the system: 3 locks held by kworker/0:0/8: 2 locks held by kworker/u8:0/11: 1 lock held by khungtaskd/30: #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by kswapd0/89: 3 locks held by kworker/0:2/969: 5 locks held by kworker/u8:6/2925: 2 locks held by getty/5591: #0: ffff88803613a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by syz.1.16/6052: 1 lock held by syz.1.16/6053: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.5.20/6190: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.5.20/6193: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.21/6241: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.21/6244: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.9.24/6259: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.9.24/6260: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.7.22/6277: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.7.22/6278: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.8.23/6284: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.8.23/6285: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.0.25/6510: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.0.25/6511: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.3.26/6686: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.3.26/6688: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.2.27/6704: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.2.27/6705: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.1.31/6714: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.1.31/6715: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.4.28/6720: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.4.28/6721: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.5.30/6737: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.5.30/6738: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.32/6770: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.32/6773: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.9.33/6800: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.9.33/6801: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.7.34/6829: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.7.34/6831: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.8.35/6842: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.8.35/6844: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.0.36/6854: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.0.36/6855: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.3.37/6864: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.3.37/6865: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.2.38/6877: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.2.38/6878: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.1.39/6916: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.1.39/6917: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 2 locks held by syz-executor/6939: #0: ffffffff8fd271d0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16580 1 lock held by syz.4.40/6958: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.4.40/6959: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz-executor/6973: #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6672 1 lock held by syz.5.41/6976: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.5.41/6977: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.42/6984: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz.6.42/6988: #0: ffff888142776510 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xdd/0x9a0 kernel/trace/blktrace.c:735 1 lock held by syz-executor/7001: #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: __rtnl_newlink net/core/rtnetlink.c:3749 [inline] #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_newlink+0xab7/0x20a0 net/core/rtnetlink.c:3772 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2925 Comm: kworker/u8:6 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x86/0x290 mm/kasan/generic.c:189 Code: 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd 41 80 3b 00 <0f> 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 00 45 89 dc RSP: 0018:ffffc9000c0ff540 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffffffff2853100 RCX: ffffffff8170536f RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff94298800 RBP: ffffffffffffffff R08: ffffffff94298807 R09: 1ffffffff2853100 R10: dffffc0000000000 R11: fffffbfff2853100 R12: ffff888030115a00 R13: 0000000000000031 R14: dffffc0000000001 R15: fffffbfff2853101 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc0c85fd0 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] hlock_class kernel/locking/lockdep.c:228 [inline] check_wait_context kernel/locking/lockdep.c:4827 [inline] __lock_acquire+0x5df/0x2050 kernel/locking/lockdep.c:5152 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] crng_make_state+0x1b3/0xa80 drivers/char/random.c:368 _get_random_bytes+0xd7/0x2c0 drivers/char/random.c:406 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:775 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x622/0xab0 drivers/net/netdevsim/dev.c:851 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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