INFO: task hwrng:753 blocked for more than 143 seconds. Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:hwrng state:D stack:28592 pid:753 tgid:753 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0xedb/0x5af0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6778 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:747 hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613 2 locks held by kworker/u4:2/38: 1 lock held by hwrng/753: #0: ffffffff8dbafe68 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504 2 locks held by getty/4827: #0: ffff88802625d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201 3 locks held by kworker/u4:4/6149: #0: ffff8880b983c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:566 [inline] #0: ffff8880b983c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:551 #1: ffff8880b9828888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988 #2: ffff8880826a8768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5870 [inline] #2: ffff8880826a8768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_wiphy_work+0x2b/0x330 net/wireless/core.c:422 1 lock held by syz-executor.1/21290: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 1 lock held by syz-executor.4/21275: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 1 lock held by syz-executor.3/23791: 1 lock held by syz-executor.4/23796: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 2 locks held by syz-executor.4/23797: #0: ffffffff8dbafe68 (reading_mutex){+.+.}-{3:3}, at: rng_dev_read+0xad/0x580 drivers/char/hw_random/core.c:228 #1: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #1: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 1 lock held by syz-executor.1/23799: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 2 locks held by kworker/0:5/24659: #0: ffff888013072938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2605 #1: ffffc90007eefd80 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2606 1 lock held by syz-executor.1/24663: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x5ed/0x3570 mm/filemap.c:3240 1 lock held by syz-executor.3/24667: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:184 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x10ee/0x1ce0 block/ioctl.c:513 1 lock held by syz-executor.4/24677: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x13a/0x5f0 mm/readahead.c:225 1 lock held by syz-executor.1/25621: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x13a/0x5f0 mm/readahead.c:225 1 lock held by syz-executor.3/25626: #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:184 [inline] #0: ffff888148cd3740 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x10ee/0x1ce0 block/ioctl.c:513 2 locks held by dhcpcd/25630: #0: ffff88803dc06130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1720 [inline] #0: ffff88803dc06130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3208 #1: ffffffff8cfb7738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline] #1: ffffffff8cfb7738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x6b1/0x800 kernel/rcu/tree_exp.h:996 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf87/0x1210 kernel/hung_task.c:379 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 38 Comm: kworker/u4:2 Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:debug_lockdep_rcu_enabled+0xa/0x30 kernel/rcu/update.c:320 Code: cc 8a e8 99 11 00 00 65 c7 05 76 0b 83 75 00 00 00 00 eb ba e8 d7 fa ff ff eb ba 0f 1f 44 00 00 f3 0f 1e fa 8b 05 8a b8 99 04 <85> c0 74 21 8b 05 84 eb 99 04 85 c0 74 17 65 48 8b 04 25 c0 bc 03 RSP: 0018:ffffc90000aefba8 EFLAGS: 00000286 RAX: 0000000000000002 RBX: ffff88801ef443d0 RCX: 00000000657c5a38 RDX: 0000000000000001 RSI: ffffffff8accbc20 RDI: ffffffff8b2f0d80 RBP: 000000000000007a R08: 0000000000000000 R09: fffffbfff23e31d0 R10: ffffffff91f18e87 R11: 0000000000000002 R12: ffff88807aff7100 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bf26f6d600 CR3: 0000000028ed8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:748 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x173/0x10e0 net/batman-adv/network-coding.c:719 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242