INFO: task syz.2.17:6531 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.17 state:D stack:28856 pid:6531 tgid:6530 ppid:6320 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8cc517e719 RSP: 002b:00007f8cc5f7e038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f8cc5335f80 RCX: 00007f8cc517e719 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f8cc51f1616 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8cc5335f80 R15: 00007ffe09dedba8 INFO: task syz.3.18:6550 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.18 state:D stack:28856 pid:6550 tgid:6548 ppid:6319 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e4cd7e719 RSP: 002b:00007f9e4dab4038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f9e4cf35f80 RCX: 00007f9e4cd7e719 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f9e4cdf1616 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9e4cf35f80 R15: 00007ffd4c11b118 INFO: task syz.0.15:6559 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.15 state:D stack:28216 pid:6559 tgid:6556 ppid:6311 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff2c4f7e719 RSP: 002b:00007ff2c5da1038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007ff2c5135f80 RCX: 00007ff2c4f7e719 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007ff2c4ff1616 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff2c5135f80 R15: 00007ffd12609768 INFO: task syz.1.16:6558 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.16 state:D stack:28856 pid:6558 tgid:6557 ppid:6316 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1591 inode_lock include/linux/fs.h:980 [inline] blkdev_fallocate+0x24c/0x430 block/fops.c:911 vfs_fallocate+0x5b4/0x10e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xd5/0x150 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f64c657e719 RSP: 002b:00007f64c72ff038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f64c6735f80 RCX: 00007f64c657e719 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007f64c65f1616 R08: 0000000000000000 R09: 0000000000000000 R10: 7fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f64c6735f80 R15: 00007ffe2bdb9918 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8e3c4460 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775 2 locks held by kworker/u8:2/36: 4 locks held by kworker/u8:4/77: 2 locks held by getty/5564: #0: ffff88814df100a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222 3 locks held by syz.4.19/6495: 1 lock held by syz.2.17/6531: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.18/6550: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.15/6559: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.16/6558: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.20/6895: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.21/6934: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.23/6940: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.24/6943: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.22/6945: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.25/7016: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.26/7022: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.29/7054: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.27/7056: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.28/7058: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.30/7103: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.31/7148: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.33/7198: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.32/7200: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.34/7202: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.35/7231: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.36/7252: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.38/7311: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.37/7313: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.39/7315: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.40/7344: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.41/7371: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.9.44/7454: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.8.43/7462: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.7.42/7471: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.4.45/7504: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.2.46/7516: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.0.47/7592: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.1.48/7598: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.3.49/7606: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.5.50/7634: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 1 lock held by syz.6.51/7636: #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff888148c24ca8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_fallocate+0x24c/0x430 block/fops.c:911 3 locks held by syz-executor/7638: #0: ffffffff8f4a2940 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline] #0: ffffffff8f4a2940 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline] #0: ffffffff8f4a2940 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:574 #1: ffffffff900f9888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff900f9888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff900f9888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4064 #2: ffffffff8e3cf9f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311 ============================================= 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 10/02/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline] watchdog+0xf3f/0x1170 kernel/hung_task.c:495 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 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: 7638 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:407 Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d e9 06 b2 38 06 e8 41 e0 f4 fc eb a0 e8 ca e0 f4 RSP: 0018:ffffc90005886c30 EFLAGS: 00000002 RAX: 000000000000002e RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: ffffffff8530f565 RDI: ffffffff9ae08860 RBP: ffffffff9ae08820 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 000000000000002e R14: ffffffff9ae08820 R15: ffffffff8530f500 FS: 000055556b0f1500(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f168cffed00 CR3: 0000000044570000 CR4: 00000000003526f0 Call Trace: serial_port_out include/linux/serial_core.h:811 [inline] serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3192 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3264 [inline] serial8250_console_write+0xfbd/0x1890 drivers/tty/serial/8250/8250_port.c:3342 console_emit_next_record kernel/printk/printk.c:3111 [inline] console_flush_all+0x801/0xc60 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3298 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423 _printk+0xc7/0x100 kernel/printk/printk.c:2448 br_set_state+0x376/0x880 net/bridge/br_stp.c:57 new_nbp net/bridge/br_if.c:443 [inline] br_add_if+0x5e5/0x1b70 net/bridge/br_if.c:599 do_set_master+0x40f/0x730 net/core/rtnetlink.c:2956 do_setlink.constprop.0+0xbd8/0x4380 net/core/rtnetlink.c:3158 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] __sys_sendto+0x4a3/0x520 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2247 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc6071805ac Code: 2a 5a 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5a 02 00 48 8b RSP: 002b:00007fff603318a0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fc607e64620 RCX: 00007fc6071805ac RDX: 0000000000000028 RSI: 00007fc607e64670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff603318f4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fc607e64670 R15: 0000000000000000