INFO: task hung in start_this

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in start_this_handle ext4				3	2018d	2026d	0/26	auto-closed as invalid on 2019/04/07 23:35
INFO: task syz-executor.1:3638 blocked for more than 143 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:23608 pid: 3638 ppid:     1 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 start_this_handle+0x5d4/0x1380 fs/jbd2/transaction.c:404
 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899
 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x63d/0x700 fs/inode.c:1941
 file_accessed include/linux/fs.h:2421 [inline]
 iterate_dir+0x465/0x700 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f7fe0344e67
RSP: 002b:00007ffde7696468 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555556ae1810 RCX: 00007f7fe0344e67
RDX: 0000000000008000 RSI: 0000555556ae1840 RDI: 0000000000000003
RBP: 0000555556ae1840 R08: 0000000000000030 R09: 00007f7fe0406640
R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000555556ae1814 R14: 0000000000000016 R15: 00007ffde7697660
 </TASK>
INFO: task syz-executor.5:3641 blocked for more than 143 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:23024 pid: 3641 ppid:     1 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 start_this_handle+0x5d4/0x1380 fs/jbd2/transaction.c:404
 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899
 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x63d/0x700 fs/inode.c:1941
 file_accessed include/linux/fs.h:2421 [inline]
 iterate_dir+0x465/0x700 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8b61163e67
RSP: 002b:00007ffe3fcccd88 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055555657c810 RCX: 00007f8b61163e67
RDX: 0000000000008000 RSI: 000055555657c840 RDI: 0000000000000003
RBP: 000055555657c840 R08: 0000000000000030 R09: 00007f8b61225640
R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 000055555657c814 R14: 0000000000000016 R15: 00007ffe3fccdf80
 </TASK>
INFO: task syz-executor.2:3642 blocked for more than 143 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:24200 pid: 3642 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 start_this_handle+0x5d4/0x1380 fs/jbd2/transaction.c:404
 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899
 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x63d/0x700 fs/inode.c:1941
 file_accessed include/linux/fs.h:2421 [inline]
 iterate_dir+0x465/0x700 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4f59ee2e67
RSP: 002b:00007fff1676f508 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555556eb8810 RCX: 00007f4f59ee2e67
RDX: 0000000000008000 RSI: 0000555556eb8840 RDI: 0000000000000003
RBP: 0000555556eb8840 R08: 0000000000000030 R09: 00007f4f59fa4640
R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000555556eb8814 R14: 0000000000000016 R15: 00007fff16770700
 </TASK>
INFO: task syz-executor.4:3643 blocked for more than 144 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:24160 pid: 3643 ppid:     1 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 start_this_handle+0x5d4/0x1380 fs/jbd2/transaction.c:404
 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899
 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x63d/0x700 fs/inode.c:1941
 file_accessed include/linux/fs.h:2421 [inline]
 iterate_dir+0x465/0x700 fs/readdir.c:70
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8e8b0a8e67
RSP: 002b:00007ffe174afd88 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555556046810 RCX: 00007f8e8b0a8e67
RDX: 0000000000008000 RSI: 0000555556046840 RDI: 0000000000000003
RBP: 0000555556046840 R08: 0000000000000030 R09: 00007f8e8b16a640
R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000555556046814 R14: 0000000000000016 R15: 00007ffe174b0f80
 </TASK>
INFO: task syz-executor.0:4452 blocked for more than 144 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27344 pid: 4452 ppid:  3639 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 io_schedule+0xee/0x170 kernel/sched/core.c:8407
 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x60/0x190 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 __wait_on_buffer+0x7a/0x90 fs/buffer.c:122
 wait_on_buffer include/linux/buffer_head.h:356 [inline]
 jbd2_write_superblock+0x6aa/0x940 fs/jbd2/journal.c:1636
 jbd2_journal_update_sb_log_tail+0x1d7/0x330 fs/jbd2/journal.c:1684
 __jbd2_update_log_tail+0x55/0x460 fs/jbd2/journal.c:1109
 jbd2_cleanup_journal_tail+0x12d/0x1f0 fs/jbd2/checkpoint.c:405
 jbd2_log_do_checkpoint+0x4e7/0xf80 fs/jbd2/checkpoint.c:359
 jbd2_journal_flush+0x1a5/0xc70 fs/jbd2/journal.c:2461
 ext4_ioctl_group_add+0x24b/0x550 fs/ext4/ioctl.c:950
 __ext4_ioctl+0xcba/0x57e0 fs/ext4/ioctl.c:1304
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4358a65059
RSP: 002b:00007f43573da168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4358b77f60 RCX: 00007f4358a65059
RDX: 0000000020000340 RSI: 0000000040286608 RDI: 0000000000000003
RBP: 00007f4358abf08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeaeb34a6f R14: 00007f43573da300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:4455 blocked for more than 144 seconds.
      Not tainted 5.17.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:26256 pid: 4455 ppid:  3640 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4db0 kernel/sched/core.c:6295
 schedule+0xd2/0x260 kernel/sched/core.c:6368
 start_this_handle+0x5d4/0x1380 fs/jbd2/transaction.c:404
 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5899
 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2409
 generic_update_time fs/inode.c:1856 [inline]
 inode_update_time fs/inode.c:1869 [inline]
 touch_atime+0x63d/0x700 fs/inode.c:1941
 file_accessed include/linux/fs.h:2421 [inline]
 filemap_read+0x9dc/0xb90 mm/filemap.c:2744
 generic_file_read_iter+0x3b6/0x5a0 mm/filemap.c:2822
 ext4_file_read_iter+0x1d4/0x5d0 fs/ext4/file.c:130
 call_read_iter include/linux/fs.h:2068 [inline]
 generic_file_splice_read+0x45b/0x6d0 fs/splice.c:311
 do_splice_to+0x1bf/0x250 fs/splice.c:796
 splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870
 do_splice_direct+0x1b3/0x280 fs/splice.c:979
 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1304 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f2373f58059
RSP: 002b:00007f23728cd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f237406af60 RCX: 00007f2373f58059
RDX: 00000000200001c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007f2373fb208d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000a198 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee7f4388f R14: 00007f23728cd300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb80fa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460
4 locks held by kworker/u4:3/90:
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:631 [inline]
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:658 [inline]
 #0: ffff8880139b0138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x890/0x1650 kernel/workqueue.c:2278
 #1: ffffc90001a47db8 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8c4/0x1650 kernel/workqueue.c:2282
 #2: ffff88807ed360e0 (&type->s_umount_key#52){++++}-{3:3}, at: trylock_super+0x1d/0x100 fs/super.c:415
 #3: ffff88807ed38bd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1ab/0x690 mm/page-writeback.c:2364
2 locks held by kworker/u4:5/1087:
 #0: ffff8880b9d39cd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489
 #1: ffff8880b9d27948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3e7/0x4e0 kernel/sched/psi.c:891
4 locks held by kworker/1:3/3268:
2 locks held by getty/3287:
 #0: ffff88814ad43098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002b5b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077
2 locks held by syz-executor.1/3638:
 #0: ffff888033872570 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2421 [inline]
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70
2 locks held by syz-executor.5/3641:
 #0: ffff8880339568b0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2421 [inline]
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70
2 locks held by syz-executor.2/3642:
 #0: ffff88802e3ba4b0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2421 [inline]
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70
2 locks held by syz-executor.4/3643:
 #0: ffff88806cbb8830 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2421 [inline]
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70
3 locks held by kworker/u4:6/3779:
 #0: ffff8880b9d39cd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489
 #1: ffff8880b9d27948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3e7/0x4e0 kernel/sched/psi.c:891
 #2: ffff888033d48d80 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1033 [inline]
 #2: ffff888033d48d80 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x90/0xe80 net/mac80211/ibss.c:1681
3 locks held by syz-executor.0/4452:
 #0: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: ext4_ioctl_group_add+0x11f/0x550 fs/ext4/ioctl.c:943
 #1: ffff88807ed3a170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x2f2/0x4e0 fs/jbd2/transaction.c:895
 #2: ffff88807ed3a3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x19d/0xc70 fs/jbd2/journal.c:2460
2 locks held by syz-executor.3/4455:
 #0: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1304 [inline]
 #0: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 #0: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1296
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2421 [inline]
 #1: ffff88807ed36460 (sb_writers#6){.+.+}-{0:0}, at: filemap_read+0x9dc/0xb90 mm/filemap.c:2744

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:369
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_acquire+0xd21/0x5470 kernel/locking/lockdep.c:5031
Code: 02 00 0f 85 80 36 00 00 48 8b 44 24 08 48 8b 14 24 49 89 85 50 0a 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 0d 3c 03 7f 09 48 8b 3c 24 e8 4e 26 62 00 41 8b 85 58 0a
RSP: 0018:ffffc900011579e0 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffffffff8f3af740 RCX: 000000000000d1f7
RDX: 1ffff110023c3193 RSI: 0000000000000001 RDI: ffffffff8f3af758
RBP: 073128447d19c31b R08: 0000000000000000 R09: ffffffff8ffd2a2f
R10: fffffbfff1ffa545 R11: 0000000000000001 R12: ffff888011e18cf0
R13: ffff888011e18240 R14: ffffffff8d948988 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f25c66fa600 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5639 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:354 [inline]
 batadv_nc_purge_paths+0xdf/0x3a0 net/batman-adv/network-coding.c:442
 batadv_nc_worker+0x8f9/0xfa0 net/batman-adv/network-coding.c:720
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	0f 85 80 36 00 00    	jne    0x3688
   8:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
   d:	48 8b 14 24          	mov    (%rsp),%rdx
  11:	49 89 85 50 0a 00 00 	mov    %rax,0xa50(%r13)
  18:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1f:	fc ff df
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	74 0d                	je     0x3b
  2e:	3c 03                	cmp    $0x3,%al
  30:	7f 09                	jg     0x3b
  32:	48 8b 3c 24          	mov    (%rsp),%rdi
  36:	e8 4e 26 62 00       	callq  0x622689
  3b:	41                   	rex.B
  3c:	8b                   	.byte 0x8b
  3d:	85 58 0a             	test   %ebx,0xa(%rax)