syzbot has found a reproducer for the following issue on: HEAD commit: ea922272cbe5 Add linux-next specific files for 20211210 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15175f75b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c1359a19d2230002 dashboard link: https://syzkaller.appspot.com/bug?extid=dcea9eda277e1090b35f compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d842b1b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dcea9eda277e1090b35f@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.1:3674 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:23920 pid: 3674 ppid: 1 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4d90 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 reclaim_throttle+0x1ce/0x5e0 mm/vmscan.c:1072 consider_reclaim_throttle mm/vmscan.c:3399 [inline] shrink_zones mm/vmscan.c:3486 [inline] do_try_to_free_pages+0x7cd/0x1620 mm/vmscan.c:3541 try_to_free_mem_cgroup_pages+0x2cd/0x840 mm/vmscan.c:3855 reclaim_high.constprop.0+0x190/0x250 mm/memcontrol.c:2299 mem_cgroup_handle_over_high+0x18c/0x540 mm/memcontrol.c:2483 tracehook_notify_resume include/linux/tracehook.h:198 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x1ab/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f345ee5e9d8 RSP: 002b:00007fff5c713cb0 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 00007f345ee5e9d8 RDX: 0000000000090800 RSI: 00007f345eeb8256 RDI: 00000000ffffff9c RBP: 00007fff5c713d7c R08: 0000000000090800 R09: 00007f345eeb8256 R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000 R13: 00000000000b3eac R14: 000000000000000b R15: 00007fff5c713de0 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb818a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 1 lock held by klogd/2959: 2 locks held by getty/3289: #0: ffff88823bcca898 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077 2 locks held by kworker/u4:1/3705: #0: ffff8880b9c39c98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489 #1: ffff8880b9c27988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3e7/0x4e0 kernel/sched/psi.c:891 =============================================
