INFO: task syz-executor.0:10135 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:27296 pid:10135 ppid: 8429 flags:0x00000004 Call Trace: context_switch syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5077 schedule+0xcf/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5156 rwsem_down_write_slowpath+0x7e5/0x1200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1106 __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1261 [inline] __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1258 [inline] __down_write syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1407 inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 do_new_mount_fc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2846 [inline] do_new_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2905 [inline] path_mount+0x14d6/0x1f90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3233 do_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3246 [inline] __do_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3454 [inline] __se_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007efdd1c9c188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdc1e1b47f R14: 00007efdd1c9c300 R15: 0000000000022000 INFO: task syz-executor.0:10135 blocked for more than 143 seconds. Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27296 pid:10135 ppid: 8429 flags:0x00000004 Call Trace: context_switch syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5077 schedule+0xcf/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/sched/core.c:5156 rwsem_down_write_slowpath+0x7e5/0x1200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1106 __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1261 [inline] __down_write_common syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1258 [inline] __down_write syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/rwsem.c:1407 inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 do_new_mount_fc syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2846 [inline] do_new_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2905 [inline] path_mount+0x14d6/0x1f90 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3233 do_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3246 [inline] __do_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3454 [inline] __se_sys_mount syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:3431 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007efdd1c9c188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdc1e1b47f R14: 00007efdd1c9c300 R15: 0000000000022000 INFO: task syz-executor.0:10140 can't die for more than 144 seconds. task:syz-executor.0 state:R running task stack:25568 pid:10140 ppid: 8429 flags:0x00004006 Call Trace: Showing all locks held in the system: 3 locks held by kworker/u4:1/24: 1 lock held by khungtaskd/1600: #0: ffffffff8bf6f820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/locking/lockdep.c:6326 1 lock held by in:imklog/8285: #0: ffff888027be59f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/file.c:961 1 lock held by syz-executor.0/10135: #0: ffff888031a90150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:775 [inline] #0: ffff888031a90150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/namespace.c:2216 2 locks held by syz-executor.0/10140: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1600 Comm: khungtaskd Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/hung_task.c:338 kthread+0x3b1/0x4a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/kthread.c:292 ret_from_fork+0x1f/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1044 Comm: kworker/u4:5 Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:__debug_check_no_obj_freed syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/debugobjects.c:978 [inline] RIP: 0010:debug_check_no_obj_freed+0x117/0x420 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/debugobjects.c:1018 Code: 22 01 00 00 00 00 ad de 4c 89 c0 31 ed 48 c1 e8 03 41 89 ec 42 80 3c 38 00 0f 85 d2 00 00 00 49 8d 78 18 41 83 c4 01 49 8b 28 <48> 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 30 02 00 00 4d 8b 48 18 RSP: 0018:ffffc9000444fa90 EFLAGS: 00000002 RAX: 1ffff11003a4f965 RBX: ffff88801b783800 RCX: ffffffff81595af0 RDX: 1ffffffff200e953 RSI: 0000000000000004 RDI: ffff88801d27cb40 RBP: 0000000000000000 R08: ffff88801d27cb28 R09: ffff88801e245750 R10: fffff52000889f40 R11: 000000000000003f R12: 0000000000000004 R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa86d1e9000 CR3: 0000000011aec000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_free_hook syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:1554 [inline] slab_free_freelist_hook+0x12b/0x1d0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:1600 slab_free syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:3161 [inline] kfree+0xe5/0x7b0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/slub.c:4202 skb_free_head syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:604 [inline] skb_release_data+0x622/0x750 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:625 skb_release_all syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:679 [inline] __kfree_skb syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:693 [inline] consume_skb syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:849 [inline] consume_skb+0xc2/0x160 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/core/skbuff.c:843 batadv_forw_packet_free+0x1e7/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/batman-adv/send.c:475 batadv_iv_send_outstanding_bat_ogm_packet+0x2b5/0x920 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/batman-adv/bat_iv_ogm.c:1729 process_one_work+0x98d/0x15f0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/kthread.c:292 ret_from_fork+0x1f/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/entry_64.S:296