Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: received NULL deAug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: received NULL device Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: received NULL device Aug 4 20:58[ 333.761249][ T30] INFO: task syz.4.570:6927 blocked for more than 143 seconds. :28 syzkaller daemon.err dhcpcd[4883]: libudev: [ 333.772556][ T30] Not tainted 6.11.0-rc1-syzkaller-00334-ga5dbd76a8942 #0 received NULL device Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev[ 333.784308][ T30] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : received NULL [ 333.784323][ T30] task:syz.4.570 state:D stack:26672 pid:6927 tgid:6927 ppid:5223 flags:0x00000004 device Aug 4 2[ 333.784380][ T30] Call Trace: 0:58:28 syzkalle[ 333.784389][ T30] r daemon.err dhc[ 333.784400][ T30] context_switch kernel/sched/core.c:5188 [inline] r daemon.err dhc[ 333.784400][ T30] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 Aug 4 20:58:28 [ 333.784550][ T30] ? __pfx___lock_acquire+0x10/0x10 kernel/locking/lockdep.c:4339 Aug 4 20:58:28 [ 333.785612][ T30] ? __pfx___schedule+0x10/0x10 Aug 4 20:58:28 [ 333.785722][ T30] ? sched_submit_work kernel/sched/core.c:6587 [inline] Aug 4 20:58:28 [ 333.785722][ T30] ? schedule+0x298/0x350 kernel/sched/core.c:6620 syzkaller daemon[ 333.785746][ T30] ? __pfx_lock_release+0x10/0x10 kernel/locking/lockdep.c:5280 .err dhcpcd[4883[ 333.785797][ T30] ? instrument_atomic_read include/linux/instrumented.h:68 [inline] .err dhcpcd[4883[ 333.785797][ T30] ? atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] .err dhcpcd[4883[ 333.785797][ T30] ? __mutex_trylock_common+0x78/0x250 kernel/locking/mutex.c:107 ]: libudev: rece[ 333.787103][ T30] __schedule_loop kernel/sched/core.c:6606 [inline] ]: libudev: rece[ 333.787103][ T30] schedule+0xe7/0x350 kernel/sched/core.c:6621 ived NULL device[ 333.787155][ T30] __mutex_lock_common kernel/locking/mutex.c:684 [inline] ived NULL device[ 333.787155][ T30] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 Aug 4 20:58:2[ 333.787601][ T30] ? __pfx___mutex_lock+0x10/0x10 8 syzkaller daem[ 333.787775][ T30] ? pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:589 [inline] 8 syzkaller daem[ 333.787775][ T30] ? queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline] 8 syzkaller daem[ 333.787775][ T30] ? do_raw_spin_unlock+0x172/0x230 kernel/locking/spinlock_debug.c:142 on.err dhcpcd[48[ 333.787844][ T30] ? bdev_release+0x166/0x6f0 block/bdev.c:1080 83]: libudev: received NULL device Aug 4 20:58:28 syzkaller da[ 333.919149][ T30] ? evm_file_release+0xd6/0x1d0 security/integrity/evm/evm_main.c:1084 emon.err dhcpcd[[ 333.927069][ T30] ? __pfx_blkdev_release+0x10/0x10 block/fops.c:551 Aug 4 20:58:28 [ 333.927129][ T30] __fput+0x408/0xbb0 fs/file_table.c:422 Aug 4 20:58:28 [ 333.949628][ T30] task_work_run+0x14e/0x250 kernel/task_work.c:228 Aug 4 20:58:28 [ 333.955379][ T30] ? __pfx_task_work_run+0x10/0x10 kernel/task_work.c:185 syzkaller daemon[ 333.961992][ T30] ? __pkru_allows_pkey+0x52/0xb0 arch/x86/include/asm/pgtable.h:1608 .err dhcpcd[4883[ 333.968340][ T30] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] .err dhcpcd[4883[ 333.968340][ T30] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] .err dhcpcd[4883[ 333.968340][ T30] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] .err dhcpcd[4883[ 333.968340][ T30] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] .err dhcpcd[4883[ 333.968340][ T30] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 ]: libudev: received NULL device Aug 4 20:58:2[ 333.978674][ T30] do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 8 syzkaller daem[ 333.984119][ T30] entry_SYSCALL_64_after_hwframe+0x77/0x7f on.err dhcpcd[48[ 333.991474][ T30] RIP: 0033:0x7fc7457779f9 83]: libudev: re[ 333.997256][ T30] RSP: 002b:00007fff4a556598 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 ceived NULL devi[ 334.007250][ T30] RAX: 0000000000000000 RBX: 00007fc745907a80 RCX: 00007fc7457779f9 ce Aug 4 20:58[ 334.016585][ T30] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 :28 syzkaller daemon.err dhcpcd[Aug 4 20:58:28 Aug 4 20:58:28 [ 334.030153][ T30] RBP: 00007fc745907a80 R08: 0000000000000006 R09: 00007fff4a55687f Aug 4 20:58:28 [ 334.039537][ T30] R10: 00000000003faa34 R11: 0000000000000246 R12: 000000000002d73b Aug 4 20:58:28 [ 334.060087][ T30] INFO: task syz.4.570:6931 blocked for more than 143 seconds. Aug 4 20:58:28 [ 334.068798][ T30] Not tainted 6.11.0-rc1-syzkaller-00334-ga5dbd76a8942 #0 syzkaller daemon.err dhcpcd[4883]: libudev: rece[ 334.080684][ T30] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ived NULL device Aug 4 20:58:2[ 334.092110][ T30] task:syz.4.570 state:D stack:26880 pid:6931 tgid:6927 ppid:5223 flags:0x00004004 8 syzkaller daem[ 334.103684][ T30] Call Trace: on.err dhcpcd[48[ 334.108350][ T30] 83]: libudev: re[ 334.113020][ T30] context_switch kernel/sched/core.c:5188 [inline] 83]: libudev: re[ 334.113020][ T30] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 Aug 4 20:58:28 [ 334.118437][ T30] ? __pfx___lock_acquire+0x10/0x10 kernel/locking/lockdep.c:4339 Aug 4 20:58:28 [ 334.118469][ T30] ? __kernel_text_address+0xd/0x40 kernel/extable.c:79 Aug 4 20:58:28 [ 334.118502][ T30] ? __pfx___schedule+0x10/0x10 Aug 4 20:58:28 [ 334.118552][ T30] ? __pfx_lock_release+0x10/0x10 kernel/locking/lockdep.c:5280 Aug 4 20:58:28 syzkaller daemonAug 4 20:58:28 Aug 4 20:58:28 [ 334.157538][ T30] ? instrument_atomic_read include/linux/instrumented.h:68 [inline] Aug 4 20:58:28 syzkaller daemonAug 4 20:58:28 Aug 4 20:58:28 [ 334.157538][ T30] ? atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] Aug 4 20:58:28 syzkaller daemonAug 4 20:58:28 Aug 4 20:58:28 [ 334.157538][ T30] ? __mutex_trylock_common+0x78/0x250 kernel/locking/mutex.c:107 Aug 4 20:58:28 Aug 4 20:58:28 [ 334.165479][ T30] __schedule_loop kernel/sched/core.c:6606 [inline] Aug 4 20:58:28 Aug 4 20:58:28 [ 334.165479][ T30] schedule+0xe7/0x350 kernel/sched/core.c:6621 Aug 4 20:58:28 Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: rece[ 334.172587][ T30] schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 ived NULL device[ 334.173913][ T30] ? __pfx___mutex_lock+0x10/0x10 Aug 4 20:58:2[ 334.173972][ T30] ? bdev_release+0x166/0x6f0 block/bdev.c:1080 8 syzkaller daem[ 334.173995][ T30] bdev_release+0x166/0x6f0 block/bdev.c:1080 on.err dhcpcd[48[ 334.175333][ T30] ? evm_file_release+0xd6/0x1d0 security/integrity/evm/evm_main.c:1084 83]: libudev: re[ 334.175363][ T30] ? __pfx_blkdev_release+0x10/0x10 block/fops.c:551 ceived NULL devi[ 334.175388][ T30] blkdev_release+0x15/0x20 block/fops.c:638 Aug 4 20:58:28 syzkaller daemon[ 334.241033][ T30] __fput+0x408/0xbb0 fs/file_table.c:422 .err dhcpcd[4883[ 334.246634][ T30] task_work_run+0x14e/0x250 kernel/task_work.c:228 ]: libudev: rece[ 334.252688][ T30] ? __pfx_task_work_run+0x10/0x10 kernel/task_work.c:185 Aug 4 20:58:28 [ 334.259178][ T30] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] Aug 4 20:58:28 [ 334.259178][ T30] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] Aug 4 20:58:28 [ 334.259178][ T30] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] Aug 4 20:58:28 [ 334.259178][ T30] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] Aug 4 20:58:28 [ 334.259178][ T30] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 syzkaller daemon[ 334.270887][ T30] do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 .err dhcpcd[4883]: libudev: receAug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: received NULL deviceAug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 syzkaller daemon[ 334.295173][ T30] entry_SYSCALL_64_after_hwframe+0x77/0x7f .err dhcpcd[4883]: libudev: received NULL device Aug 4 20:58:28 syzkaller daemon.err dhcpcd[48Aug 4 20:58:28 [ 334.310584][ T30] RIP: 0033:0x7fc7457779f9 Aug 4 20:58:28 [ 334.316169][ T30] RSP: 002b:00007fc746472048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 Aug 4 20:58:28 [ 334.316197][ T30] RAX: 0000000000000000 RBX: 00007fc745906058 RCX: 00007fc7457779f9 Aug 4 20:58:28 [ 334.316214][ T30] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 syzkaller daemon[ 334.316230][ T30] RBP: 00007fc7457e58ee R08: 0000000000000000 R09: 0000000000000000 .err dhcpcd[4883[ 334.316251][ T30] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 ]: libudev: rece[ 334.316266][ T30] R13: 000000000000006e R14: 00007fc745906058 R15: 00007fff4a556438 ived NULL device[ 334.316287][ T30] Aug 4 20:58:28 syzkaller daemon.err dhcpcd[4883]: libudev: re[ 334.390780][ T30] 1 lock held by khungtaskd/30: ceived NULL devi[ 334.395718][ T30] #0: ffffffff8ddb5ca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] ceived NULL devi[ 334.395718][ T30] #0: ffffffff8ddb5ca0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] ceived NULL devi[ 334.395718][ T30] #0: ffffffff8ddb5ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6620 Aug 4 20:58:28 [ 334.407324][ T30] 1 lock held by syslogd/4651: syzkaller daemon[ 334.413151][ T30] 2 locks held by getty/4971: Aug 4 20:58:28 [ 334.419136][ T30] #0: ffff88802b83d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 Aug 4 20:58:28 [ 334.430338][ T30] #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 Aug 4 20:58:28 [ 334.430449][ T30] 1 lock held by udevd/6838: Aug 4 20:58:28 [ 334.430464][ T30] #0: ffff888020f314c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x41a/0xe40 block/bdev.c:897 Aug 4 20:58:28 [ 334.430527][ T30] 1 lock held by syz.4.570/6927: Aug 4 20:58:28 [ 334.430541][ T30] #0: ffff888020f314c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x166/0x6f0 block/bdev.c:1080 syzkaller daemon[ 334.482508][ T30] 1 lock held by syz.4.570/6931: .err dhcpcd[4883]: libudev: receAug 4 20:58:28 Aug 4 20:58:28 [ 334.493934][ T30] #0: ffff888020f314c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x166/0x6f0 block/bdev.c:1080 Aug 4 20:58:28 Aug 4 20:58:28 Aug 4 20:58:28 [ 334.504322][ T30]