INFO: task syz.2.19:4484 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:26640 pid:4484 ppid:4405 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 rwsem_down_write_slowpath+0xc2e/0x1110 kernel/locking/rwsem.c:1189 inode_lock include/linux/fs.h:758 [inline] blkdev_fallocate+0x200/0x4a0 block/fops.c:712 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xbd/0x100 fs/open.c:352 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f841259c799 RSP: 002b:00007ffc19846698 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f8412815fa0 RCX: 00007f841259c799 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f8412632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0010000001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8412815fac R14: 00007f8412815fa0 R15: 00007f8412815fa0 INFO: task syz.3.20:4485 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:26640 pid:4485 ppid:4410 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 rwsem_down_write_slowpath+0xc2e/0x1110 kernel/locking/rwsem.c:1189 inode_lock include/linux/fs.h:758 [inline] blkdev_fallocate+0x200/0x4a0 block/fops.c:712 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xbd/0x100 fs/open.c:352 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f50abb9c799 RSP: 002b:00007ffc5300ecc8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f50abe15fa0 RCX: 00007f50abb9c799 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f50abc32c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0010000001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f50abe15fac R14: 00007f50abe15fa0 R15: 00007f50abe15fa0 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 2 locks held by kworker/u4:2/39: 3 locks held by kworker/1:2/129: #0: ffff88802ee64d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #1: ffffc90002d67d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xca/0x14f0 net/ipv6/addrconf.c:4131 2 locks held by getty/4027: #0: ffff88814d84e098 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000327b2f0 ( &ldata->atomic_read_lock ){+.+.}-{3:3} , at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198 3 locks held by kworker/0:12/4454: #0: ffff88802ee64d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #1: ffffc90003547d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xca/0x14f0 net/ipv6/addrconf.c:4131 2 locks held by syz.1.18/4483: 1 lock held by syz.2.19/4484: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.3.20/4485: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.0.17/4500: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.4.21/4501: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.5.22/4574: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.6.23/4580: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.7.24/4596: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.8.25/4603: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.9.26/4604: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.2.28/4656: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.1.27/4657: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.3.29/4669: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.0.30/4674: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.4.31/4678: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.5.32/4716: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.6.33/4738: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.7.34/4774: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.8.35/4777: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.9.36/4782: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.2.37/4803: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.1.38/4809: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.3.39/4841: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.0.40/4856: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.4.41/4866: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 6 locks held by kworker/u4:8/4882: 1 lock held by syz.5.42/4894: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.6.43/4896: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.7.44/4922: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz.8.45/4943: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 2 locks held by syz-executor/4956: 1 lock held by syz.9.46/4966: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 1 lock held by syz-executor/4984: #0: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8dd469e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x824/0xfc0 net/core/rtnetlink.c:6147 1 lock held by syz.2.47/4988: #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff8880178d3320 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x200/0x4a0 block/fops.c:712 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xeee/0xf30 kernel/hung_task.c:377 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4428 Comm: kworker/u4:6 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x80 kernel/kcov.c:321 Code: 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 <48> 8b 04 24 65 48 8b 0d a4 f8 7f 7e 65 8b 15 a5 f8 7f 7e 81 e2 00 RSP: 0018:ffffc900001e0818 EFLAGS: 00000046 RAX: ffffffff8172af2b RBX: ffffffff8a8e0608 RCX: ffff888027035940 RDX: 0000000000000100 RSI: 0000000000000200 RDI: 0000000000000000 RBP: ffffc900001e08d8 R08: ffff888027035940 R09: 0000000000000002 R10: 0000000000000080 R11: 0000000000000100 R12: 0000000000000246 R13: 1ffff110088ad4d5 R14: 1ffff9200003c104 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32463fff CR3: 000000007e64c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:125 [inline] seqcount_lockdep_reader_access+0x9c/0x1d0 include/linux/seqlock.h:101 ktime_get_with_offset+0x90/0x320 kernel/time/timekeeping.c:889 ktime_get_boottime include/linux/timekeeping.h:95 [inline] ktime_get_boottime_ns include/linux/timekeeping.h:164 [inline] mac80211_hwsim_tx_frame_no_nl+0x69d/0x12c0 drivers/net/wireless/mac80211_hwsim.c:1673 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/mac80211_hwsim.c:2058 mac80211_hwsim_beacon_tx+0x61e/0xae0 drivers/net/wireless/mac80211_hwsim.c:2121 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:788 ieee80211_iterate_active_interfaces_atomic+0xd7/0x170 net/mac80211/util.c:824 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147 __run_hrtimer kernel/time/hrtimer.c:1747 [inline] __hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4e a0 2d f7 48 89 df e8 96 68 2e f7 e8 c1 bc 51 f7 fb bf 01 00 00 00 86 cb 21 f7 65 8b 05 47 50 cb 75 85 c0 74 02 5b c3 e8 94 64 c9 RSP: 0018:ffffc90003437c30 EFLAGS: 00000286 RAX: 2d8a1dab75fbac00 RBX: ffff888017479800 RCX: 2d8a1dab75fbac00 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: 0000000000000001 RBP: ffffc90003437dc0 R08: ffff888017479803 R09: 1ffff11002e8f300 R10: dffffc0000000000 R11: ffffed1002e8f301 R12: dffffc0000000000 R13: ffff888074f686c0 R14: 0000000000000100 R15: 1ffff1100e9ed0d8 process_one_work+0x788/0x1160 kernel/workqueue.c:2265 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295