INFO: task syz.2.19:6071 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.19 state:D stack:27072 pid:6071 tgid:6071 ppid:5964 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 rwsem_down_write_slowpath+0x899/0x1040 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1bc/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:1028 [inline] blkdev_fallocate+0x260/0x530 block/fops.c:908 vfs_fallocate+0x669/0x7e0 fs/open.c:340 ksys_fallocate fs/open.c:364 [inline] __do_sys_fallocate fs/open.c:369 [inline] __se_sys_fallocate fs/open.c:367 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6b4b19c629 RSP: 002b:00007fff6a58c2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f6b4b415fa0 RCX: 00007f6b4b19c629 RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00007f6b4b232b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0008000000000203 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6b4b415fac R14: 00007f6b4b415fa0 R15: 00007f6b4b415fa0 INFO: task syz.3.20:6072 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.20 state:D stack:27072 pid:6072 tgid:6072 ppid:5960 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 rwsem_down_write_slowpath+0x899/0x1040 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1bc/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:1028 [inline] blkdev_fallocate+0x260/0x530 block/fops.c:908 vfs_fallocate+0x669/0x7e0 fs/open.c:340 ksys_fallocate fs/open.c:364 [inline] __do_sys_fallocate fs/open.c:369 [inline] __se_sys_fallocate fs/open.c:367 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4355d9c629 RSP: 002b:00007ffedadc1e78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f4356015fa0 RCX: 00007f4355d9c629 RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00007f4355e32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0008000000000203 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4356015fac R14: 00007f4356015fa0 R15: 00007f4356015fa0 INFO: task syz.1.18:6073 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:27072 pid:6073 tgid:6073 ppid:5969 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 rwsem_down_write_slowpath+0x899/0x1040 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1bc/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:1028 [inline] blkdev_fallocate+0x260/0x530 block/fops.c:908 vfs_fallocate+0x669/0x7e0 fs/open.c:340 ksys_fallocate fs/open.c:364 [inline] __do_sys_fallocate fs/open.c:369 [inline] __se_sys_fallocate fs/open.c:367 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3f3a39c629 RSP: 002b:00007ffecce0b388 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f3f3a615fa0 RCX: 00007f3f3a39c629 RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00007f3f3a432b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0008000000000203 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3f3a615fac R14: 00007f3f3a615fa0 R15: 00007f3f3a615fa0 Showing all locks held in the system: 1 lock held by ksoftirqd/1/23: #0: ffff8880b853ade0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:647 1 lock held by khungtaskd/31: #0: ffffffff8e9602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e9602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e9602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:3/49: #0: ffff888032890148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc90000b97c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffffffff8fdf0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8fdf0d08 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0 net/ipv6/addrconf.c:4199 2 locks held by getty/5585: #0: ffff888037cb30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900033332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:5/6069: #0: ffff88813ff47548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffff8880b8424588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffff8880b84271d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: ffff8880b84271d8 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30 kernel/time/timer.c:1085 2 locks held by syz.0.17/6070: 1 lock held by syz.2.19/6071: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.3.20/6072: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.1.18/6073: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.5.22/6190: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.7.24/6191: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.4.21/6192: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.6.23/6193: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.8.25/6270: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.1.28/6287: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.0.27/6288: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.9.26/6289: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.2.29/6352: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.5.31/6383: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.3.30/6384: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.4.32/6385: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.6.33/6447: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.8.35/6491: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.9.36/6497: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.7.34/6498: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.0.37/6521: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.1.38/6579: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.2.39/6580: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.3.40/6581: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.5.41/6608: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 3 locks held by syz-executor/6629: #0: ffffffff8fdf0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8fdf0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8fdf0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0 net/core/rtnetlink.c:4071 #1: ffff88804f895528 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50 #2: ffffffff8e966578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #2: ffffffff8e966578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961 1 lock held by syz.4.42/6690: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 1 lock held by syz.6.43/6694: #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff8880241187a8 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:908 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xfd9/0x1030 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:stack_trace_save+0x5d/0x100 kernel/stacktrace.c:114 Code: 24 08 fc a2 fc 8d 48 c7 44 24 10 60 15 b1 81 48 89 e3 48 c1 eb 03 48 b9 f1 f1 f1 f1 f8 f8 f8 f3 49 be 00 00 00 00 00 fc ff df <4a> 89 0c 33 42 c7 44 33 08 f3 f3 f3 f3 66 42 c7 44 33 04 00 00 42 RSP: 0018:ffffc90000007a80 EFLAGS: 00000a06 RAX: ffffc90000007aa0 RBX: 1ffff92000000f50 RCX: f3f8f8f8f1f1f1f1 RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffffc90000007b30 RBP: ffffc90000007b20 R08: dffffc0000000000 R09: 0000000000000000 R10: ffffc90000007b30 R11: fffffbfff2067957 R12: ffffea00016b2980 R13: ffff8880767b5880 R14: dffffc0000000000 R15: ffffc90000007b30 FS: 0000000000000000(0000) GS:ffff888124fff000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32863fff CR3: 0000000055960000 CR4: 00000000003526f0 Call Trace: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2687 [inline] slab_free_after_rcu_debug+0x126/0x220 mm/slub.c:6189 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 handle_softirqs+0x22a/0x870 kernel/softirq.c:626 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1aa/0x7d0 net/core/skbuff.c:697 alloc_skb include/linux/skbuff.h:1383 [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+0x29a/0xb80 drivers/net/netdevsim/dev.c:922 process_one_work+0x949/0x1650 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245