INFO: task syz.4.4645:23115 blocked in I/O wait for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.4645 state:D stack:25624 pid:23115 tgid:23114 ppid:21639 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x125c/0x6730 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7326 io_schedule+0x8a/0xf0 kernel/sched/core.c:8154 folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1323 folio_lock include/linux/pagemap.h:1157 [inline] migrate_folio_unmap mm/migrate.c:1250 [inline] migrate_pages_batch+0x7a1/0x45c0 mm/migrate.c:1907 migrate_pages_sync+0x4db/0x880 mm/migrate.c:2051 migrate_pages+0x1a83/0x2850 mm/migrate.c:2133 compact_zone+0x243c/0x4420 mm/compaction.c:2668 compact_node+0x17f/0x2c0 mm/compaction.c:2937 compact_nodes mm/compaction.c:2959 [inline] sysctl_compaction_handler mm/compaction.c:3010 [inline] sysctl_compaction_handler+0x141/0x210 mm/compaction.c:2997 proc_sys_call_handler+0x47f/0x5a0 fs/proc/proc_sysctl.c:600 iter_file_splice_write+0x830/0x10b0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x192/0x690 fs/splice.c:1159 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1228 do_sendfile+0xadc/0xe20 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1426 [inline] __se_sys_sendfile64 fs/read_write.c:1418 [inline] __x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd88539de99 RSP: 002b:00007fd8861f5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fd885625fa0 RCX: 00007fd88539de99 RDX: 00002000000000c0 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007fd885433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd885626038 R14: 00007fd885625fa0 R15: 00007ffff85fbe88 Showing all locks held in the system: 1 lock held by khungtaskd/43: #0: ffffffff8ebe6180 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8ebe6180 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffffffff8ebe6180 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775 2 locks held by getty/5542: #0: ffff88802be510a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000eb2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211 3 locks held by sshd-session/5650: 1 lock held by udevd/12473: #0: ffff888028a7a350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:948 1 lock held by udevd/13828: #0: ffff88802839a350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:948 1 lock held by udevd/13831: #0: ffff888028a7e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:948 4 locks held by kworker/2:6/16439: #0: ffff88801fe87940 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297 #1: ffffc9000347fd08 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298 #2: ffff88802bed51d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline] #2: ffff88802bed51d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c0/0x4a60 drivers/usb/core/hub.c:5899 #3: ffff88802c11a568 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline] #3: ffff88802c11a568 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0xb21/0x4a60 drivers/usb/core/hub.c:5952 1 lock held by syz.4.4645/23115: #0: ffff8880454ce450 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103 1 lock held by syz.5.6126/28958: #0: ffff8880392ecea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0xb0 net/bluetooth/hci_core.c:497 1 lock held by syz.9.6240/29341: #0: ffff888028ce2450 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103 2 locks held by syz-executor/29767: #0: ffffffff90a83dc8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575 #1: ffffffff8ebf1c28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343 2 locks held by syz.5.6373/29843: #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x371/0xe90 net/core/rtnetlink.c:7082 #1: ffffffff8ebf1c28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343 1 lock held by syz.3.6374/29846: #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x23e/0x47c0 drivers/net/tun.c:3148 1 lock held by syz.3.6374/29848: #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x371/0xe90 net/core/rtnetlink.c:7082 1 lock held by syz.3.6374/29851: #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x371/0xe90 net/core/rtnetlink.c:7082 2 locks held by syz.3.6374/29852: #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline] #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline] #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:574 #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8bb/0x2380 net/core/rtnetlink.c:4158 2 locks held by syz.3.6374/29853: #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline] #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline] #0: ffffffff91246548 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:574 #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff90a9c9c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8bb/0x2380 net/core/rtnetlink.c:4158 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 43 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:122 nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x141/0x190 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xcb1/0x1030 kernel/hung_task.c:561 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1-3: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5650 Comm: sshd-session Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data+0x30/0x90 kernel/kcov.c:246 Code: 12 49 89 f8 49 89 f1 49 89 d2 65 48 8b 3d b0 ca 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc <8b> 87 24 17 00 00 85 c0 74 f1 8b 87 f8 16 00 00 83 f8 03 75 e6 48 RSP: 0000:ffffc900006a0c38 EFLAGS: 00000046 RAX: 0000000080000102 RBX: 00000000ffffff81 RCX: ffffffff87cff290 RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffff8880268b0000 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802cad8000 R13: 0000000000000081 R14: ffff88802cc7a470 R15: dffffc0000000000 FS: 00007fc1b5760300(0000) GS:ffff8880d5ee6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc1b4ea4000 CR3: 0000000033d5a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000fda3b69a DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: find_endpoint+0xd0/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1590 dummy_timer+0x4fb/0x36c0 drivers/usb/gadget/udc/dummy_hcd.c:1874 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xac/0xe0 kernel/softirq.c:510 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] crypto_acomp_unlock_stream_bh include/crypto/internal/acompress.h:202 [inline] scomp_acomp_comp_decomp+0x741/0xc40 crypto/scompress.c:255 crypto_acomp_decompress+0x14c/0x540 crypto/acompress.c:297 zswap_decompress+0x4c7/0x810 mm/zswap.c:952 zswap_load+0x25e/0x7c0 mm/zswap.c:1609 swap_read_folio+0xab7/0x2ec0 mm/page_io.c:689 swap_cache_read_folio+0xae/0x140 mm/swap_state.c:652 swap_cluster_readahead+0x387/0x5f0 mm/swap_state.c:831 swapin_readahead+0x159/0x1200 mm/swap_state.c:984 do_swap_page+0xf98/0x5780 mm/memory.c:4836 handle_pte_fault mm/memory.c:6382 [inline] __handle_mm_fault+0x192f/0x2a00 mm/memory.c:6517 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7fc1b517f0d3 Code: 01 62 e1 fe 28 7f 41 01 62 e1 fe 28 7f 41 02 62 e1 fe 28 7f 41 03 c3 48 3b 15 29 92 07 00 73 5f 40 0f b6 c6 48 89 d1 48 89 fa aa 48 89 d0 c3 83 fa 10 7d 22 62 e1 fd 08 7e c1 83 fa 08 7d 27 RSP: 002b:00007ffff6dab698 EFLAGS: 00010287 RAX: 0000000000000000 RBX: 00007fc1b4c4a010 RCX: 00000000000b6010 RDX: 00007fc1b4c4a010 RSI: 0000000000000000 RDI: 00007fc1b4ea4000 RBP: 000055db7c36d6e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000055db7c370360 R13: 000055db6ab2ab12 R14: 000055db7c373300 R15: 000055db7c36d6e0 NMI backtrace for cpu 3 CPU: 3 UID: 0 PID: 25077 Comm: kworker/u33:46 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:debug_lockdep_rcu_enabled+0x2b/0x40 kernel/rcu/update.c:320 Code: 0f 1e fa 8b 05 6e 46 68 05 85 c0 74 20 8b 05 20 79 68 05 85 c0 74 16 65 48 8b 05 c8 9d a9 08 8b 80 9c 0b 00 00 85 c0 0f 94 c0 <0f> b6 c0 e9 fd 3e 03 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 RSP: 0018:ffffc9000faaf620 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffc9000faafa20 RCX: ffffffff91d35b01 RDX: ffffc9000faafa28 RSI: ffffc9000faafa00 RDI: ffffc9000faaf6a8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000017a32 R12: ffffc9000faaf6e8 R13: ffffc9000faaf698 R14: ffffc9000faafa20 R15: ffffc9000faaf6cc FS: 0000000000000000(0000) GS:ffff8880d60e6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000033f0d000 CR4: 0000000000352ef0 Call Trace: rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1183 [inline] unwind_next_frame+0x3a8/0x2090 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5362 [inline] __kmalloc_node_track_caller_noprof+0x331/0x830 mm/slub.c:5497 kmalloc_reserve+0xe8/0x350 net/core/skbuff.c:637 __alloc_skb+0x185/0x710 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x2af/0xd20 drivers/net/netdevsim/dev.c:922 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 NMI backtrace for cpu 2 CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: d6 8c 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d c3 89 11 00 fb f4 bc 48 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000187e00 EFLAGS: 00000202 RAX: 00000000005ba38f RBX: ffff88801eecca80 RCX: ffffffff8bba12d5 RDX: 0000000000000000 RSI: ffffffff8e1a4c48 RDI: ffffffff8c401480 RBP: ffffed1003dd9950 R08: 0000000000000001 R09: ffffed100d4c678d R10: ffff88806a633c6b R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff92000030fc4 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d5fe6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce53957e20 CR3: 000000002ee51000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000008001800 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:768 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x3a7/0x5b0 kernel/sched/idle.c:355 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x158