INFO: task syz.3.19:6840 blocked for more than 143 seconds. Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.19 state:D stack:27240 pid:6840 tgid:6839 ppid:6624 task_flags:0x400040 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578 inode_lock include/linux/fs.h:869 [inline] blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 vfs_fallocate+0x6a3/0x830 fs/open.c:341 ksys_fallocate fs/open.c:365 [inline] __do_sys_fallocate fs/open.c:370 [inline] __se_sys_fallocate fs/open.c:368 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:368 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc8b0585d29 RSP: 002b:00007fc8b13ca038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fc8b0775fa0 RCX: 00007fc8b0585d29 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007fc8b0601b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000100001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc8b0775fa0 R15: 00007fff2869d358 INFO: task syz.2.18:6845 blocked for more than 143 seconds. Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.18 state:D stack:28328 pid:6845 tgid:6844 ppid:6622 task_flags:0x400040 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578 inode_lock include/linux/fs.h:869 [inline] blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 vfs_fallocate+0x6a3/0x830 fs/open.c:341 ksys_fallocate fs/open.c:365 [inline] __do_sys_fallocate fs/open.c:370 [inline] __se_sys_fallocate fs/open.c:368 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:368 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f54dd985d29 RSP: 002b:00007f54de701038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f54ddb75fa0 RCX: 00007f54dd985d29 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f54dda01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000100001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f54ddb75fa0 R15: 00007ffec2396a58 INFO: task syz.1.17:6852 blocked for more than 144 seconds. Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.17 state:D stack:28328 pid:6852 tgid:6851 ppid:6621 task_flags:0x400040 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578 inode_lock include/linux/fs.h:869 [inline] blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 vfs_fallocate+0x6a3/0x830 fs/open.c:341 ksys_fallocate fs/open.c:365 [inline] __do_sys_fallocate fs/open.c:370 [inline] __se_sys_fallocate fs/open.c:368 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:368 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff7cd785d29 RSP: 002b:00007ff7ce648038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007ff7cd975fa0 RCX: 00007ff7cd785d29 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007ff7cd801b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000100001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff7cd975fa0 R15: 00007ffced730328 INFO: task syz.4.20:6858 blocked for more than 144 seconds. Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.20 state:D stack:28200 pid:6858 tgid:6857 ppid:6626 task_flags:0x400040 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578 inode_lock include/linux/fs.h:869 [inline] blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 vfs_fallocate+0x6a3/0x830 fs/open.c:341 ksys_fallocate fs/open.c:365 [inline] __do_sys_fallocate fs/open.c:370 [inline] __se_sys_fallocate fs/open.c:368 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:368 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa6b385d29 RSP: 002b:00007ffa6c0f8038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007ffa6b575fa0 RCX: 00007ffa6b385d29 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007ffa6b401b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000100001002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffa6b575fa0 R15: 00007ffd9cb51e98 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 5 locks held by kworker/u8:3/49: #0: ffff8880b8739e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606 #1: ffff8880b8723f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39e/0x6d0 kernel/sched/psi.c:987 #2: ffff8880b8725958 (&base->lock){-.-.}-{2:2}, at: nsim_dev_trap_report_work+0x57/0xb80 drivers/net/netdevsim/dev.c:838 #3: ffffffff99d2ebb0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0xbb/0x420 lib/debugobjects.c:818 #4: ffff8880b8739e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606 4 locks held by kworker/u8:4/64: #0: ffff8880b8739e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606 #1: ffff8880b8723f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39e/0x6d0 kernel/sched/psi.c:987 #2: ffff8880b8625958 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x8ee/0xf30 kernel/time/timer.c:1117 #3: ffffffff99c62988 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0xbb/0x420 lib/debugobjects.c:818 3 locks held by kworker/u8:6/3442: #0: ffff8880308ab948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff8880308ab948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321 #1: ffffc9000c8efbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc9000c8efbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321 #2: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0 net/ipv6/addrconf.c:4198 4 locks held by kworker/u8:7/3449: #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321 #1: ffffc9000c92fbc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc9000c92fbc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321 #2: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303 #3: ffffffff8e144938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] #3: ffffffff8e144938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:998 2 locks held by getty/5599: #0: ffff888031a240a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 4 locks held by syz.0.16/6825: 1 lock held by syz.3.19/6840: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.2.18/6845: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.1.17/6852: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.4.20/6858: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.5.21/7322: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.6.22/7335: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.7.23/7341: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.8.24/7350: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.9.25/7354: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.0.26/7666: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.2.27/7694: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.4.30/7700: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.3.28/7702: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.1.29/7704: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.5.31/7773: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.6.32/7825: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.8.33/7839: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.7.34/7841: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.9.35/7843: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.0.36/7866: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.2.37/7968: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.4.38/7973: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.1.40/7975: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.3.39/7983: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz.5.41/7995: #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #0: ffff888022cb63a0 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x1d8/0x4b0 block/fops.c:877 1 lock held by syz-executor/7997: #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/8008: #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0 net/ipv4/devinet.c:979 7 locks held by syz-executor/8014: #0: ffff8880359bc428 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3096 [inline] #0: ffff8880359bc428 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff88804faef088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1e0/0x4f0 fs/kernfs/file.c:325 #2: ffff888027baa008 (kn->active#58){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x203/0x4f0 fs/kernfs/file.c:326 #3: ffffffff8ed98c28 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd1/0x360 drivers/net/netdevsim/bus.c:216 #4: ffff8880254680e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #4: ffff8880254680e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff8880254680e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x7c0 drivers/base/dd.c:1292 #5: ffff88802546a250 (&devlink->lock_key#22){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1675 #6: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: unregister_nexthop_notifier+0x17/0x40 net/ipv4/nexthop.c:3957 2 locks held by syz-executor/8027: #0: ffffffff8fa101a0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8fa101a0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8fa101a0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:570 #1: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70 net/core/rtnetlink.c:4054 1 lock held by syz-executor/8039: #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8f50ae88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70 net/core/rtnetlink.c:4054 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:470 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3578 Comm: kworker/u8:10 Not tainted 6.16.0-rc4-syzkaller-g1f988d0788f5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:lock_release+0x5/0x3e0 kernel/locking/lockdep.c:5879 Code: 03 48 8b 3c 24 e9 08 fa ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 30 49 89 f5 49 89 fe 65 48 8b RSP: 0018:ffffc9000cfcf890 EFLAGS: 00000293 RAX: ffffffff8b30e661 RBX: 00000000000003c9 RCX: ffff8880323e3c00 RDX: 0000000000000000 RSI: ffffffff8b30e408 RDI: ffffffff8e13ee20 RBP: ffffc9000cfcf9d0 R08: 0000000000000000 R09: ffffffff8b30e408 R10: dffffc0000000000 R11: fffffbfff1f417df R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880578ec8b4 FS: 0000000000000000(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1b04620910 CR3: 000000000df38000 CR4: 00000000003526f0 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:779 [inline] batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:833 [inline] batadv_iv_ogm_schedule+0x6d1/0xea0 net/batman-adv/bat_iv_ogm.c:876 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1720 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245