syzbot


BUG: sleeping function called from invalid context in ext4_writepages

Status: auto-closed as invalid on 2020/03/13 05:53
Reported-by: syzbot+fc51afb2ed2c8f69e754@syzkaller.appspotmail.com
First crash: 1616d, last: 1616d

Sample crash report:
BUG: sleeping function called from invalid context at ./include/linux/percpu-rwsem.h:33
in_atomic(): 1, irqs_disabled(): 0, pid: 22393, name: syz-executor.1
1 lock held by syz-executor.1/22393:
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] spin_lock include/linux/spinlock.h:302 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pte_range mm/memory.c:1116 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pmd_range mm/memory.c:1249 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pud_range mm/memory.c:1270 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] unmap_page_range+0x67e/0x1690 mm/memory.c:1291
Preemption disabled at:[ 2063.410665] [<00000000379c475e>] spin_lock include/linux/spinlock.h:302 [inline]
Preemption disabled at:[ 2063.410665] [<00000000379c475e>] zap_pte_range mm/memory.c:1116 [inline]
Preemption disabled at:[ 2063.410665] [<00000000379c475e>] zap_pmd_range mm/memory.c:1249 [inline]
Preemption disabled at:[ 2063.410665] [<00000000379c475e>] zap_pud_range mm/memory.c:1270 [inline]
Preemption disabled at:[ 2063.410665] [<00000000379c475e>] unmap_page_range+0x67e/0x1690 mm/memory.c:1291
CPU: 1 PID: 22393 Comm: syz-executor.1 Not tainted 4.9.194+ #0
 ffff8801db7075e0 ffffffff81b67001 0000000000000000 0000000000000101
 ffff8801ab0daf80 ffffffff814a3e2e ffff8801ab0daf80 ffff8801db707618
 ffffffff81401cd3 ffff8801ab0daf80 ffffffff82ad9d20 0000000000000021
Call Trace:
 <IRQ> [ 2063.452591]  [<00000000e920f234>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [ 2063.452591]  [<00000000e920f234>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000896aee97>] ___might_sleep.cold+0x1c1/0x1fa kernel/sched/core.c:8004
 [<000000000f62cb45>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7961
 [<0000000089cbc6b7>] percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:33 [inline]
 [<0000000089cbc6b7>] percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
 [<0000000089cbc6b7>] ext4_writepages+0x170/0x2de0 fs/ext4/inode.c:2658
 [<000000003b39ecf6>] do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
 [<00000000c02dca68>] __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
 [<00000000a69273b7>] filemap_write_and_wait_range mm/filemap.c:580 [inline]
 [<00000000a69273b7>] filemap_write_and_wait_range+0x5c/0xb0 mm/filemap.c:573
 [<0000000096455492>] __generic_file_fsync+0x9b/0x1c0 fs/libfs.c:974
 [<00000000f1c435a0>] ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116
 [<0000000025755349>] vfs_fsync_range+0x111/0x260 fs/sync.c:195
 [<000000006c3dc663>] generic_write_sync include/linux/fs.h:2613 [inline]
 [<000000006c3dc663>] dio_complete+0x376/0x6e0 fs/direct-io.c:282
 [<00000000c2f4c42a>] dio_bio_end_aio+0x124/0x390 fs/direct-io.c:323
 [<00000000c05d4f49>] bio_endio+0x1ad/0x200 block/bio.c:1784
 [<00000000a0305ac9>] req_bio_endio block/blk-core.c:157 [inline]
 [<00000000a0305ac9>] blk_update_request+0x24e/0x9d0 block/blk-core.c:2629
 [<000000006af3b07e>] scsi_end_request+0x9c/0x5c0 drivers/scsi/scsi_lib.c:606
 [<00000000f0d0394d>] scsi_io_completion+0x275/0x17e0 drivers/scsi/scsi_lib.c:829
 [<0000000031f425d3>] scsi_finish_command+0x3ad/0x520 drivers/scsi/scsi.c:607
 [<000000006cb2996d>] scsi_softirq_done+0x259/0x370 drivers/scsi/scsi_lib.c:1567
 [<000000006438ee24>] blk_done_softirq+0x27e/0x3e0 block/blk-softirq.c:35
 [<00000000ad3bdf81>] __do_softirq+0x22d/0x964 kernel/softirq.c:288
 [<0000000018565230>] invoke_softirq kernel/softirq.c:368 [inline]
 [<0000000018565230>] irq_exit+0x119/0x160 kernel/softirq.c:409
 [<0000000019443631>] exiting_irq arch/x86/include/asm/apic.h:669 [inline]
 [<0000000019443631>] do_IRQ+0x111/0x1d0 arch/x86/kernel/irq.c:252
 [<0000000009dd5314>] common_interrupt+0xa5/0xa5 arch/x86/entry/entry_64.S:466
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? __read_once_size include/linux/compiler.h:264 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? compound_head include/linux/page-flags.h:145 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? PageAnon include/linux/page-flags.h:397 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? zap_pte_range mm/memory.c:1146 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? zap_pmd_range mm/memory.c:1249 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? zap_pud_range mm/memory.c:1270 [inline]
 <EOI> [ 2063.873513]  [<00000000d39254ff>] ? unmap_page_range+0xaf3/0x1690 mm/memory.c:1291
 [<000000005ab9696f>] unmap_single_vma+0x124/0x180 mm/memory.c:1336
 [<000000002dc57d71>] unmap_vmas+0x48/0xa0 mm/memory.c:1366
 [<00000000f501f37e>] exit_mmap+0x1e3/0x3b0 mm/mmap.c:3024
 [<000000006dfd9f92>] __mmput kernel/fork.c:886 [inline]
 [<000000006dfd9f92>] mmput kernel/fork.c:908 [inline]
 [<000000006dfd9f92>] mmput+0xd5/0x370 kernel/fork.c:903
 [<0000000036717d6f>] exit_mm kernel/exit.c:514 [inline]
 [<0000000036717d6f>] do_exit+0x6ce/0x2aa0 kernel/exit.c:829
 [<000000009cc8f4ff>] do_group_exit+0x111/0x300 kernel/exit.c:946
 [<00000000cf52cfa3>] get_signal+0x377/0x1cb0 kernel/signal.c:2395
 [<0000000025f7b110>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812
 [<00000000ad5721ff>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159
 [<000000003a62c2a3>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 [<000000003a62c2a3>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
 [<000000003a62c2a3>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
 [<0000000064ce4dd9>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

=========================================================
[ INFO: possible irq lock inversion dependency detected ]
4.9.194+ #0 Tainted: G        W      
---------------------------------------------------------
syz-executor.1/22393 just changed the state of lock:
 (&sbi->s_journal_flag_rwsem){.+.?.+}, at: [<000000003b39ecf6>] do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
 (&ei->i_data_sem){++++..}

and interrupts could create inverse lock ordering between them.


other info that might help us debug this:
 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ei->i_data_sem);
                               local_irq_disable();
                               lock(&sbi->s_journal_flag_rwsem);
                               lock(&ei->i_data_sem);
  <Interrupt>
    lock(&sbi->s_journal_flag_rwsem);

 *** DEADLOCK ***

1 lock held by syz-executor.1/22393:
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] spin_lock include/linux/spinlock.h:302 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pte_range mm/memory.c:1116 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pmd_range mm/memory.c:1249 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] zap_pud_range mm/memory.c:1270 [inline]
 #0:  (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<00000000379c475e>] unmap_page_range+0x67e/0x1690 mm/memory.c:1291

the shortest dependencies between 2nd lock and 1st lock:
 -> (&ei->i_data_sem){++++..} ops: 8370799 {
    HARDIRQ-ON-W at:
                      mark_irqflags kernel/locking/lockdep.c:2937 [inline]
                      __lock_acquire+0xfa9/0x4390 kernel/locking/lockdep.c:3302
                      lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                      down_write+0x41/0xa0 kernel/locking/rwsem.c:52
                      ext4_release_file+0x25b/0x2e0 fs/ext4/file.c:50
                      __fput+0x274/0x720 fs/file_table.c:208
                      ____fput+0x16/0x20 fs/file_table.c:244
                      task_work_run+0x108/0x180 kernel/task_work.c:116
                      tracehook_notify_resume include/linux/tracehook.h:191 [inline]
                      exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
                      prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
                      syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
                      do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
                      entry_SYSCALL_64_after_swapgs+0x5d/0xdb
    HARDIRQ-ON-R at:
                      mark_irqflags kernel/locking/lockdep.c:2929 [inline]
                      __lock_acquire+0x502/0x4390 kernel/locking/lockdep.c:3302
                      lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                      down_read+0x44/0xb0 kernel/locking/rwsem.c:22
                      ext4_map_blocks+0x344/0x16d0 fs/ext4/inode.c:533
                      ext4_getblk+0x307/0x490 fs/ext4/inode.c:943
                      __ext4_find_entry+0xa1a/0xf80 fs/ext4/namei.c:1424
                      ext4_lookup_entry fs/ext4/namei.c:1529 [inline]
                      ext4_lookup+0x16b/0x5f0 fs/ext4/namei.c:1597
                      lookup_slow+0x24b/0x480 fs/namei.c:1793
                      walk_component+0x71e/0xce0 fs/namei.c:1909
                      lookup_last fs/namei.c:2391 [inline]
                      path_lookupat.isra.0+0x18f/0x3f0 fs/namei.c:2408
                      filename_lookup+0x1a1/0x3b0 fs/namei.c:2442
                      user_path_at_empty+0x43/0x50 fs/namei.c:2703
                      user_path include/linux/namei.h:60 [inline]
                      do_mount+0x124/0x2970 fs/namespace.c:2816
                      SYSC_mount fs/namespace.c:3087 [inline]
                      SyS_mount+0xab/0x120 fs/namespace.c:3064
                      devtmpfs_mount+0x4a/0x70 drivers/base/devtmpfs.c:357
                      prepare_namespace+0x1ef/0x21d init/do_mounts.c:603
                      kernel_init_freeable+0x3aa/0x3c8 init/main.c:1045
                      kernel_init+0x12/0x163 init/main.c:953
                      ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
    SOFTIRQ-ON-W at:
                      mark_irqflags kernel/locking/lockdep.c:2941 [inline]
                      __lock_acquire+0x557/0x4390 kernel/locking/lockdep.c:3302
                      lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                      down_write+0x41/0xa0 kernel/locking/rwsem.c:52
                      ext4_release_file+0x25b/0x2e0 fs/ext4/file.c:50
                      __fput+0x274/0x720 fs/file_table.c:208
                      ____fput+0x16/0x20 fs/file_table.c:244
                      task_work_run+0x108/0x180 kernel/task_work.c:116
                      tracehook_notify_resume include/linux/tracehook.h:191 [inline]
                      exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
                      prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
                      syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
                      do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
                      entry_SYSCALL_64_after_swapgs+0x5d/0xdb
    SOFTIRQ-ON-R at:
                      mark_irqflags kernel/locking/lockdep.c:2941 [inline]
                      __lock_acquire+0x557/0x4390 kernel/locking/lockdep.c:3302
                      lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                      down_read+0x44/0xb0 kernel/locking/rwsem.c:22
                      ext4_map_blocks+0x344/0x16d0 fs/ext4/inode.c:533
                      ext4_getblk+0x307/0x490 fs/ext4/inode.c:943
                      __ext4_find_entry+0xa1a/0xf80 fs/ext4/namei.c:1424
                      ext4_lookup_entry fs/ext4/namei.c:1529 [inline]
                      ext4_lookup+0x16b/0x5f0 fs/ext4/namei.c:1597
                      lookup_slow+0x24b/0x480 fs/namei.c:1793
                      walk_component+0x71e/0xce0 fs/namei.c:1909
                      lookup_last fs/namei.c:2391 [inline]
                      path_lookupat.isra.0+0x18f/0x3f0 fs/namei.c:2408
                      filename_lookup+0x1a1/0x3b0 fs/namei.c:2442
                      user_path_at_empty+0x43/0x50 fs/namei.c:2703
                      user_path include/linux/namei.h:60 [inline]
                      do_mount+0x124/0x2970 fs/namespace.c:2816
                      SYSC_mount fs/namespace.c:3087 [inline]
                      SyS_mount+0xab/0x120 fs/namespace.c:3064
                      devtmpfs_mount+0x4a/0x70 drivers/base/devtmpfs.c:357
                      prepare_namespace+0x1ef/0x21d init/do_mounts.c:603
                      kernel_init_freeable+0x3aa/0x3c8 init/main.c:1045
                      kernel_init+0x12/0x163 init/main.c:953
                      ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
    INITIAL USE at:
                     __lock_acquire+0x5e0/0x4390 kernel/locking/lockdep.c:3306
                     lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                     down_read+0x44/0xb0 kernel/locking/rwsem.c:22
                     ext4_map_blocks+0x344/0x16d0 fs/ext4/inode.c:533
                     ext4_getblk+0x307/0x490 fs/ext4/inode.c:943
                     __ext4_find_entry+0xa1a/0xf80 fs/ext4/namei.c:1424
                     ext4_lookup_entry fs/ext4/namei.c:1529 [inline]
                     ext4_lookup+0x16b/0x5f0 fs/ext4/namei.c:1597
                     lookup_slow+0x24b/0x480 fs/namei.c:1793
                     walk_component+0x71e/0xce0 fs/namei.c:1909
                     lookup_last fs/namei.c:2391 [inline]
                     path_lookupat.isra.0+0x18f/0x3f0 fs/namei.c:2408
                     filename_lookup+0x1a1/0x3b0 fs/namei.c:2442
                     user_path_at_empty+0x43/0x50 fs/namei.c:2703
                     user_path include/linux/namei.h:60 [inline]
                     do_mount+0x124/0x2970 fs/namespace.c:2816
                     SYSC_mount fs/namespace.c:3087 [inline]
                     SyS_mount+0xab/0x120 fs/namespace.c:3064
                     devtmpfs_mount+0x4a/0x70 drivers/base/devtmpfs.c:357
                     prepare_namespace+0x1ef/0x21d init/do_mounts.c:603
                     kernel_init_freeable+0x3aa/0x3c8 init/main.c:1045
                     kernel_init+0x12/0x163 init/main.c:953
                     ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
  }
  ... key      at: [<000000005c44b0a1>] __key.74919+0x0/0x40
  ... acquired at:
   lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
   down_write+0x41/0xa0 kernel/locking/rwsem.c:52
   ext4_map_blocks+0x754/0x16d0 fs/ext4/inode.c:605
   mpage_map_one_extent fs/ext4/inode.c:2386 [inline]
   mpage_map_and_submit_extent fs/ext4/inode.c:2442 [inline]
   ext4_writepages+0x1597/0x2de0 fs/ext4/inode.c:2783
   do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
   __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
   __filemap_fdatawrite mm/filemap.c:400 [inline]
   filemap_flush+0x24/0x30 mm/filemap.c:425
   ext4_alloc_da_blocks+0xd6/0x340 fs/ext4/inode.c:3157
   ext4_release_file+0x1ff/0x2e0 fs/ext4/file.c:42
   __fput+0x274/0x720 fs/file_table.c:208
   ____fput+0x16/0x20 fs/file_table.c:244
   task_work_run+0x108/0x180 kernel/task_work.c:116
   tracehook_notify_resume include/linux/tracehook.h:191 [inline]
   exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
   prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
   syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
   do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
   entry_SYSCALL_64_after_swapgs+0x5d/0xdb

-> (&sbi->s_journal_flag_rwsem){.+.?.+} ops: 53826 {
   HARDIRQ-ON-R at:
                    mark_irqflags kernel/locking/lockdep.c:2929 [inline]
                    __lock_acquire+0x502/0x4390 kernel/locking/lockdep.c:3302
                    lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                    percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
                    percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
                    ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
                    do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
                    __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
                    SyS_fadvise64_64+0x701/0x830 mm/fadvise.c:123
                    SYSC_fadvise64 mm/fadvise.c:182 [inline]
                    SyS_fadvise64+0x2c/0x40 mm/fadvise.c:180
                    do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
                    entry_SYSCALL_64_after_swapgs+0x5d/0xdb
   IN-SOFTIRQ-R at:
                    mark_irqflags kernel/locking/lockdep.c:2923 [inline]
                    __lock_acquire+0xf82/0x4390 kernel/locking/lockdep.c:3302
                    lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                    percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
                    percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
                    ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
                    do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
                    __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
                    filemap_write_and_wait_range mm/filemap.c:580 [inline]
                    filemap_write_and_wait_range+0x5c/0xb0 mm/filemap.c:573
                    __generic_file_fsync+0x9b/0x1c0 fs/libfs.c:974
                    ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116
                    vfs_fsync_range+0x111/0x260 fs/sync.c:195
                    generic_write_sync include/linux/fs.h:2613 [inline]
                    dio_complete+0x376/0x6e0 fs/direct-io.c:282
                    dio_bio_end_aio+0x124/0x390 fs/direct-io.c:323
                    bio_endio+0x1ad/0x200 block/bio.c:1784
                    req_bio_endio block/blk-core.c:157 [inline]
                    blk_update_request+0x24e/0x9d0 block/blk-core.c:2629
                    scsi_end_request+0x9c/0x5c0 drivers/scsi/scsi_lib.c:606
                    scsi_io_completion+0x275/0x17e0 drivers/scsi/scsi_lib.c:829
                    scsi_finish_command+0x3ad/0x520 drivers/scsi/scsi.c:607
                    scsi_softirq_done+0x259/0x370 drivers/scsi/scsi_lib.c:1567
                    blk_done_softirq+0x27e/0x3e0 block/blk-softirq.c:35
                    __do_softirq+0x22d/0x964 kernel/softirq.c:288
                    invoke_softirq kernel/softirq.c:368 [inline]
                    irq_exit+0x119/0x160 kernel/softirq.c:409
                    exiting_irq arch/x86/include/asm/apic.h:669 [inline]
                    do_IRQ+0x111/0x1d0 arch/x86/kernel/irq.c:252
                    ret_from_intr+0x0/0x20
                    unmap_single_vma+0x124/0x180 mm/memory.c:1336
                    unmap_vmas+0x48/0xa0 mm/memory.c:1366
                    exit_mmap+0x1e3/0x3b0 mm/mmap.c:3024
                    __mmput kernel/fork.c:886 [inline]
                    mmput kernel/fork.c:908 [inline]
                    mmput+0xd5/0x370 kernel/fork.c:903
                    exit_mm kernel/exit.c:514 [inline]
                    do_exit+0x6ce/0x2aa0 kernel/exit.c:829
                    do_group_exit+0x111/0x300 kernel/exit.c:946
                    get_signal+0x377/0x1cb0 kernel/signal.c:2395
                    do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812
                    exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159
                    prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
                    syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
                    do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
                    entry_SYSCALL_64_after_swapgs+0x5d/0xdb
   SOFTIRQ-ON-R at:
                    mark_irqflags kernel/locking/lockdep.c:2941 [inline]
                    __lock_acquire+0x557/0x4390 kernel/locking/lockdep.c:3302
                    lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                    percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
                    percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
                    ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
                    do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
                    __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
                    SyS_fadvise64_64+0x701/0x830 mm/fadvise.c:123
                    SYSC_fadvise64 mm/fadvise.c:182 [inline]
                    SyS_fadvise64+0x2c/0x40 mm/fadvise.c:180
                    do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
                    entry_SYSCALL_64_after_swapgs+0x5d/0xdb
   RECLAIM_FS-ON-R at:
                       mark_held_locks+0xb1/0x100 kernel/locking/lockdep.c:2660
                       __lockdep_trace_alloc kernel/locking/lockdep.c:2882 [inline]
                       lockdep_trace_alloc+0x18c/0x2b0 kernel/locking/lockdep.c:2897
                       slab_pre_alloc_hook mm/slab.h:392 [inline]
                       slab_alloc_node mm/slub.c:2641 [inline]
                       slab_alloc mm/slub.c:2723 [inline]
                       kmem_cache_alloc+0x2d/0x2b0 mm/slub.c:2728
                       kmem_cache_zalloc include/linux/slab.h:626 [inline]
                       ext4_init_io_end+0x27/0x100 fs/ext4/page-io.c:252
                       ext4_writepages+0xd06/0x2de0 fs/ext4/inode.c:2750
                       do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
                       __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
                       __filemap_fdatawrite mm/filemap.c:400 [inline]
                       filemap_flush+0x24/0x30 mm/filemap.c:425
                       ext4_alloc_da_blocks+0xd6/0x340 fs/ext4/inode.c:3157
                       ext4_release_file+0x1ff/0x2e0 fs/ext4/file.c:42
                       __fput+0x274/0x720 fs/file_table.c:208
                       ____fput+0x16/0x20 fs/file_table.c:244
                       task_work_run+0x108/0x180 kernel/task_work.c:116
                       tracehook_notify_resume include/linux/tracehook.h:191 [inline]
                       exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
                       prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
                       syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
                       do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
                       entry_SYSCALL_64_after_swapgs+0x5d/0xdb
   INITIAL USE at:
                   __lock_acquire+0x5e0/0x4390 kernel/locking/lockdep.c:3306
                   lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
                   percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
                   percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
                   ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
                   do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
                   __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
                   SyS_fadvise64_64+0x701/0x830 mm/fadvise.c:123
                   SYSC_fadvise64 mm/fadvise.c:182 [inline]
                   SyS_fadvise64+0x2c/0x40 mm/fadvise.c:180
                   do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
                   entry_SYSCALL_64_after_swapgs+0x5d/0xdb
 }
 ... key      at: [<00000000447f8cb9>] rwsem_key.75616+0x0/0x40
 ... acquired at:
   check_usage_forwards+0x144/0x280 kernel/locking/lockdep.c:2493
   mark_lock_irq kernel/locking/lockdep.c:2610 [inline]
   mark_lock+0x42d/0x12e0 kernel/locking/lockdep.c:3065
   mark_irqflags kernel/locking/lockdep.c:2923 [inline]
   __lock_acquire+0xf82/0x4390 kernel/locking/lockdep.c:3302
   lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
   percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
   percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
   ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
   do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
   __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
   filemap_write_and_wait_range mm/filemap.c:580 [inline]
   filemap_write_and_wait_range+0x5c/0xb0 mm/filemap.c:573
   __generic_file_fsync+0x9b/0x1c0 fs/libfs.c:974
   ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116
   vfs_fsync_range+0x111/0x260 fs/sync.c:195
   generic_write_sync include/linux/fs.h:2613 [inline]
   dio_complete+0x376/0x6e0 fs/direct-io.c:282
   dio_bio_end_aio+0x124/0x390 fs/direct-io.c:323
   bio_endio+0x1ad/0x200 block/bio.c:1784
   req_bio_endio block/blk-core.c:157 [inline]
   blk_update_request+0x24e/0x9d0 block/blk-core.c:2629
   scsi_end_request+0x9c/0x5c0 drivers/scsi/scsi_lib.c:606
   scsi_io_completion+0x275/0x17e0 drivers/scsi/scsi_lib.c:829
   scsi_finish_command+0x3ad/0x520 drivers/scsi/scsi.c:607
   scsi_softirq_done+0x259/0x370 drivers/scsi/scsi_lib.c:1567
   blk_done_softirq+0x27e/0x3e0 block/blk-softirq.c:35
   __do_softirq+0x22d/0x964 kernel/softirq.c:288
   invoke_softirq kernel/softirq.c:368 [inline]
   irq_exit+0x119/0x160 kernel/softirq.c:409
   exiting_irq arch/x86/include/asm/apic.h:669 [inline]
   do_IRQ+0x111/0x1d0 arch/x86/kernel/irq.c:252
   ret_from_intr+0x0/0x20
   unmap_single_vma+0x124/0x180 mm/memory.c:1336
   unmap_vmas+0x48/0xa0 mm/memory.c:1366
   exit_mmap+0x1e3/0x3b0 mm/mmap.c:3024
   __mmput kernel/fork.c:886 [inline]
   mmput kernel/fork.c:908 [inline]
   mmput+0xd5/0x370 kernel/fork.c:903
   exit_mm kernel/exit.c:514 [inline]
   do_exit+0x6ce/0x2aa0 kernel/exit.c:829
   do_group_exit+0x111/0x300 kernel/exit.c:946
   get_signal+0x377/0x1cb0 kernel/signal.c:2395
   do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812
   exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159
   prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
   syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
   do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
   entry_SYSCALL_64_after_swapgs+0x5d/0xdb


stack backtrace:
CPU: 1 PID: 22393 Comm: syz-executor.1 Tainted: G        W       4.9.194+ #0
 ffff8801db707290 ffffffff81b67001 0000000000000001 ffffffff8401e400
 ffff8801db707340 ffff8801ab0daf80 ffffffff83cb8d30 ffff8801db7072e0
 ffffffff8140741a 0000000100000000 ffffffff00000000 ffffffff8401e410
Call Trace:
 <IRQ> [ 2065.470736]  [<00000000e920f234>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [ 2065.470736]  [<00000000e920f234>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000072b51779>] print_irq_inversion_bug kernel/locking/lockdep.c:2468 [inline]
 [<0000000072b51779>] print_irq_inversion_bug.cold+0x31a/0x35d kernel/locking/lockdep.c:2413
 [<00000000d7129d60>] check_usage_forwards+0x144/0x280 kernel/locking/lockdep.c:2493
 [<00000000a9870650>] mark_lock_irq kernel/locking/lockdep.c:2610 [inline]
 [<00000000a9870650>] mark_lock+0x42d/0x12e0 kernel/locking/lockdep.c:3065
 [<0000000022d745ef>] mark_irqflags kernel/locking/lockdep.c:2923 [inline]
 [<0000000022d745ef>] __lock_acquire+0xf82/0x4390 kernel/locking/lockdep.c:3302
 [<00000000696f97d7>] lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
 [<00000000e67a5b5f>] percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline]
 [<00000000e67a5b5f>] percpu_down_read include/linux/percpu-rwsem.h:58 [inline]
 [<00000000e67a5b5f>] ext4_writepages+0x1a1/0x2de0 fs/ext4/inode.c:2658
 [<000000003b39ecf6>] do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
 [<00000000c02dca68>] __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
 [<00000000a69273b7>] filemap_write_and_wait_range mm/filemap.c:580 [inline]
 [<00000000a69273b7>] filemap_write_and_wait_range+0x5c/0xb0 mm/filemap.c:573
 [<0000000096455492>] __generic_file_fsync+0x9b/0x1c0 fs/libfs.c:974
 [<00000000f1c435a0>] ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116
 [<0000000025755349>] vfs_fsync_range+0x111/0x260 fs/sync.c:195
 [<000000006c3dc663>] generic_write_sync include/linux/fs.h:2613 [inline]
 [<000000006c3dc663>] dio_complete+0x376/0x6e0 fs/direct-io.c:282
 [<00000000c2f4c42a>] dio_bio_end_aio+0x124/0x390 fs/direct-io.c:323
 [<00000000c05d4f49>] bio_endio+0x1ad/0x200 block/bio.c:1784
 [<00000000a0305ac9>] req_bio_endio block/blk-core.c:157 [inline]
 [<00000000a0305ac9>] blk_update_request+0x24e/0x9d0 block/blk-core.c:2629
 [<000000006af3b07e>] scsi_end_request+0x9c/0x5c0 drivers/scsi/scsi_lib.c:606
 [<00000000f0d0394d>] scsi_io_completion+0x275/0x17e0 drivers/scsi/scsi_lib.c:829
 [<0000000031f425d3>] scsi_finish_command+0x3ad/0x520 drivers/scsi/scsi.c:607
 [<000000006cb2996d>] scsi_softirq_done+0x259/0x370 drivers/scsi/scsi_lib.c:1567
 [<000000006438ee24>] blk_done_softirq+0x27e/0x3e0 block/blk-softirq.c:35
 [<00000000ad3bdf81>] __do_softirq+0x22d/0x964 kernel/softirq.c:288
 [<0000000018565230>] invoke_softirq kernel/softirq.c:368 [inline]
 [<0000000018565230>] irq_exit+0x119/0x160 kernel/softirq.c:409
 [<0000000019443631>] exiting_irq arch/x86/include/asm/apic.h:669 [inline]
 [<0000000019443631>] do_IRQ+0x111/0x1d0 arch/x86/kernel/irq.c:252
 [<0000000009dd5314>] common_interrupt+0xa5/0xa5 arch/x86/entry/entry_64.S:466
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? __read_once_size include/linux/compiler.h:264 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? compound_head include/linux/page-flags.h:145 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? PageAnon include/linux/page-flags.h:397 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? zap_pte_range mm/memory.c:1146 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? zap_pmd_range mm/memory.c:1249 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? zap_pud_range mm/memory.c:1270 [inline]
 <EOI> [ 2065.977829]  [<00000000d39254ff>] ? unmap_page_range+0xaf3/0x1690 mm/memory.c:1291
 [<000000005ab9696f>] unmap_single_vma+0x124/0x180 mm/memory.c:1336
 [<000000002dc57d71>] unmap_vmas+0x48/0xa0 mm/memory.c:1366
 [<00000000f501f37e>] exit_mmap+0x1e3/0x3b0 mm/mmap.c:3024
 [<000000006dfd9f92>] __mmput kernel/fork.c:886 [inline]
 [<000000006dfd9f92>] mmput kernel/fork.c:908 [inline]
 [<000000006dfd9f92>] mmput+0xd5/0x370 kernel/fork.c:903
 [<0000000036717d6f>] exit_mm kernel/exit.c:514 [inline]
 [<0000000036717d6f>] do_exit+0x6ce/0x2aa0 kernel/exit.c:829
 [<000000009cc8f4ff>] do_group_exit+0x111/0x300 kernel/exit.c:946
 [<00000000cf52cfa3>] get_signal+0x377/0x1cb0 kernel/signal.c:2395
 [<0000000025f7b110>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812
 [<00000000ad5721ff>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159
 [<000000003a62c2a3>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 [<000000003a62c2a3>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
 [<000000003a62c2a3>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
 [<0000000064ce4dd9>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
BUG: sleeping function called from invalid context at mm/page-writeback.c:2117
in_atomic(): 1, irqs_disabled(): 0, pid: 22393, name: syz-executor.1
INFO: lockdep is turned off.
Preemption disabled at:[ 2066.241179] [<00000000379c475e>] spin_lock include/linux/spinlock.h:302 [inline]
Preemption disabled at:[ 2066.241179] [<00000000379c475e>] zap_pte_range mm/memory.c:1116 [inline]
Preemption disabled at:[ 2066.241179] [<00000000379c475e>] zap_pmd_range mm/memory.c:1249 [inline]
Preemption disabled at:[ 2066.241179] [<00000000379c475e>] zap_pud_range mm/memory.c:1270 [inline]
Preemption disabled at:[ 2066.241179] [<00000000379c475e>] unmap_page_range+0x67e/0x1690 mm/memory.c:1291
CPU: 1 PID: 22393 Comm: syz-executor.1 Tainted: G        W       4.9.194+ #0
 ffff8801db707580 ffffffff81b67001 0000000000000000 0000000000000101
 ffff8801ab0daf80 ffffffff814a3e2e ffff8801ab0daf80 ffff8801db7075b8
 ffffffff81401cd3 0000000000000000 ffff88018ec964c0 0000000000000200
Call Trace:
 <IRQ> [ 2066.284288]  [<00000000e920f234>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [ 2066.284288]  [<00000000e920f234>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000896aee97>] ___might_sleep.cold+0x1c1/0x1fa kernel/sched/core.c:8004
 [<000000003b0d194a>] tag_pages_for_writeback+0xa0/0x190 mm/page-writeback.c:2117
 [<00000000d81d0954>] ext4_writepages+0xcb5/0x2de0 fs/ext4/inode.c:2745
 [<000000003b39ecf6>] do_writepages+0xfc/0x1e0 mm/page-writeback.c:2338
 [<00000000c02dca68>] __filemap_fdatawrite_range+0x1ad/0x260 mm/filemap.c:392
 [<00000000a69273b7>] filemap_write_and_wait_range mm/filemap.c:580 [inline]
 [<00000000a69273b7>] filemap_write_and_wait_range+0x5c/0xb0 mm/filemap.c:573
 [<0000000096455492>] __generic_file_fsync+0x9b/0x1c0 fs/libfs.c:974
 [<00000000f1c435a0>] ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116
 [<0000000025755349>] vfs_fsync_range+0x111/0x260 fs/sync.c:195
 [<000000006c3dc663>] generic_write_sync include/linux/fs.h:2613 [inline]
 [<000000006c3dc663>] dio_complete+0x376/0x6e0 fs/direct-io.c:282
 [<00000000c2f4c42a>] dio_bio_end_aio+0x124/0x390 fs/direct-io.c:323
 [<00000000c05d4f49>] bio_endio+0x1ad/0x200 block/bio.c:1784
 [<00000000a0305ac9>] req_bio_endio block/blk-core.c:157 [inline]
 [<00000000a0305ac9>] blk_update_request+0x24e/0x9d0 block/blk-core.c:2629
 [<000000006af3b07e>] scsi_end_request+0x9c/0x5c0 drivers/scsi/scsi_lib.c:606
 [<00000000f0d0394d>] scsi_io_completion+0x275/0x17e0 drivers/scsi/scsi_lib.c:829
 [<0000000031f425d3>] scsi_finish_command+0x3ad/0x520 drivers/scsi/scsi.c:607
 [<000000006cb2996d>] scsi_softirq_done+0x259/0x370 drivers/scsi/scsi_lib.c:1567
 [<000000006438ee24>] blk_done_softirq+0x27e/0x3e0 block/blk-softirq.c:35
 [<00000000ad3bdf81>] __do_softirq+0x22d/0x964 kernel/softirq.c:288
 [<0000000018565230>] invoke_softirq kernel/softirq.c:368 [inline]
 [<0000000018565230>] irq_exit+0x119/0x160 kernel/softirq.c:409
 [<0000000019443631>] exiting_irq arch/x86/include/asm/apic.h:669 [inline]
 [<0000000019443631>] do_IRQ+0x111/0x1d0 arch/x86/kernel/irq.c:252
 [<0000000009dd5314>] common_interrupt+0xa5/0xa5 arch/x86/entry/entry_64.S:466
 <EOI> 
 [<000000005ab9696f>] unmap_single_vma+0x124/0x180 mm/memory.c:1336
 [<000000002dc57d71>] unmap_vmas+0x48/0xa0 mm/memory.c:1366
 [<00000000f501f37e>] exit_mmap+0x1e3/0x3b0 mm/mmap.c:3024
 [<000000006dfd9f92>] __mmput kernel/fork.c:886 [inline]
 [<000000006dfd9f92>] mmput kernel/fork.c:908 [inline]
 [<000000006dfd9f92>] mmput+0xd5/0x370 kernel/fork.c:903
 [<0000000036717d6f>] exit_mm kernel/exit.c:514 [inline]
 [<0000000036717d6f>] do_exit+0x6ce/0x2aa0 kernel/exit.c:829
 [<000000009cc8f4ff>] do_group_exit+0x111/0x300 kernel/exit.c:946
 [<00000000cf52cfa3>] get_signal+0x377/0x1cb0 kernel/signal.c:2395
 [<0000000025f7b110>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812
 [<00000000ad5721ff>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159
 [<000000003a62c2a3>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 [<000000003a62c2a3>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
 [<000000003a62c2a3>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
 [<0000000064ce4dd9>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
BUG: scheduling while atomic: syz-executor.1/22393/0x00000102
INFO: lockdep is turned off.
Modules linked in:
Preemption disabled at:
[<00000000379c475e>] spin_lock include/linux/spinlock.h:302 [inline]
[<00000000379c475e>] zap_pte_range mm/memory.c:1116 [inline]
[<00000000379c475e>] zap_pmd_range mm/memory.c:1249 [inline]
[<00000000379c475e>] zap_pud_range mm/memory.c:1270 [inline]
[<00000000379c475e>] unmap_page_range+0x67e/0x1690 mm/memory.c:1291

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/14 05:52 https://android.googlesource.com/kernel/common android-4.9 7fe05eede1c8 048f2d49 .config console log report ci-android-49-kasan-gce-root
* Struck through repros no longer work on HEAD.