INFO: task syz.2.4856:22499 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.4856      state:D stack:24552 pid:22499 tgid:22499 ppid:20607  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 exit_mm+0x73/0x220
 do_exit+0x62e/0x2310
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f64ef19aa22
RSP: 002b:00007ffe011b9348 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007f64ef19aa22
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000020022 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffe011b94b0
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
INFO: task syz.2.4856:22502 blocked for more than 144 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.4856      state:D stack:25192 pid:22502 tgid:22499 ppid:20607  task_flags:0x40054c flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 exit_mm+0x73/0x220
 do_exit+0x62e/0x2310
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f64ef19acb9
RSP: 002b:00007f64f00de028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: fffffffffffffff2 RBX: 00007f64ef416090 RCX: 00007f64ef19acb9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f64ef208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f64ef416128 R14: 00007f64ef416090 R15: 00007ffe011b93b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a3a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:6/3297:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90023d6fbc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
 #3: ffffffff8e360cb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by getty/5657:
 #0: ffff8881764a70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by kworker/u8:4/6012:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90004097bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f79a910 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: ipmr_net_exit_batch+0x20/0x90
3 locks held by kworker/1:11/11237:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900051e7bc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
3 locks held by kworker/u8:7/20655:
 #0: ffff888173d16148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc9000960fbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
1 lock held by syz.2.4856/22499:
 #0: ffff88817456b440 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0x73/0x220
6 locks held by syz.2.4856/22501:
1 lock held by syz.2.4856/22502:
 #0: ffff88817456b440 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0x73/0x220
1 lock held by syz-executor/22587:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/22592:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x65f/0xe30
1 lock held by syz-executor/22593:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/22639:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/22645:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/22647:
 #0: ffffffff8f7a8f88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 22501 Comm: syz.2.4856 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 d0 61 08 0a cc 89 f6 31 d2 e9 96 a1 5f 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a085c8 EFLAGS: 00000046
RAX: 000000000000013e RBX: ffff88823c623e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000013e RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff81b027c5 R09: ffffffff99df0508
R10: 0000000000000003 R11: ffffffff81721570 R12: 000000000ffff94a
R13: dffffc0000000000 R14: 000000000000013e R15: 0000000000000020
FS:  00007f64f00ff6c0(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6964edf866 CR3: 00000001a0224000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1c9/0x350
 hrtimer_interrupt+0x620/0xaa0
 __sysvec_apic_timer_interrupt+0x102/0x3d0
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x3a/0xb0
Code: e8 7b 83 d0 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 fd d7 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 0c e2 81 00 48 c7 c3 d8 b6 d0 92 49 03 1e 48 89
RSP: 0018:ffffc90000a08830 EFLAGS: 00000246
RAX: 1ffffffff1baffbb RBX: 0000000000000001 RCX: 0000000000000102
RDX: ffffc90000a089c8 RSI: ffffffff8be73ee0 RDI: ffffffff8be73ea0
RBP: dffffc0000000000 R08: ffffc9000858f2a8 R09: 0000000000000000
R10: ffffc90000a089d8 R11: fffff5200014113d R12: ffffc90000a089d8
R13: ffffffff8174c0e5 R14: ffffffff8dd7fdd8 R15: dffffc0000000000
 lock_release+0x4b/0x3a0
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1be/0x650
 slab_free_after_rcu_debug+0x5e/0x250
 rcu_core+0xc9e/0x1750
 handle_softirqs+0x22a/0x7c0
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:percpu_counter_add_batch+0x50/0x1d0
Code: f6 8c f2 fc 48 89 5c 24 10 4c 8d 73 58 4c 89 f0 48 c1 e8 03 48 89 04 24 42 80 3c 38 00 74 08 4c 89 f7 e8 d3 2c 5a fd 49 8b 06 <65> 8b 28 41 89 ef 41 c1 ff 1f 49 c1 e7 20 4c 89 6c 24 08 4d 01 ef
RSP: 0018:ffffc9000858f360 EFLAGS: 00000246
RAX: 0000607d56304720 RBX: ffff8881099a9fa8 RCX: 0000000000080000
RDX: ffffc9002812d000 RSI: 00000000000387fc RDI: 00000000000387fd
RBP: ffffc9000858f670 R08: ffff88816af4e003 R09: 1ffff1102d5e9c00
R10: dffffc0000000000 R11: ffffed102d5e9c01 R12: 0000000000000020
R13: 0000000000000030 R14: ffff8881099aa000 R15: dffffc0000000000
 add_mm_rss_vec+0x76/0x320
 copy_pmd_range+0x75d0/0x7f80
 copy_page_range+0xb95/0x11b0
 dup_mmap+0xf70/0x1bb0
 copy_mm+0x13b/0x4b0
 copy_process+0x166e/0x3980
 kernel_clone+0x248/0x870
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f64ef19acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f64f00fefd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f64ef415fa0 RCX: 00007f64ef19acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007f64ef208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f64ef416038 R14: 00007f64ef415fa0 R15: 00007ffe011b93b8
 </TASK>
