BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_background_flush fs/fs-writeback.c:1962 [inline]
wb_do_writeback fs/fs-writeback.c:2050 [inline]
wb_workfn+0x9bc/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 2 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 2 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 2 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 2 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 2 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u17:1/32
caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
CPU: 0 PID: 32 Comm: kworker/u17:1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
mpage_map_one_extent fs/ext4/inode.c:2377 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2430 [inline]
ext4_writepages+0x1a7b/0x33c0 fs/ext4/inode.c:2782
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
__writeback_single_inode+0x12a/0x13d0 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdc0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x8db/0xd50 fs/fs-writeback.c:1894
wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
wb_do_writeback fs/fs-writeback.c:2049 [inline]
wb_workfn+0xab3/0x1090 fs/fs-writeback.c:2078
process_one_work+0x965/0x1690 kernel/workqueue.c:2269
worker_thread+0x96/0xe10 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293