==================================================================
BUG: KCSAN: data-race in wbt_done / wbt_issue

write to 0xffff8881011c5130 of 8 bytes by task 2019 on cpu 1:
 wbt_issue+0x9e/0xd0 block/blk-wbt.c:610
 __rq_qos_issue+0x3b/0x70 block/blk-rq-qos.c:54
 rq_qos_issue block/blk-rq-qos.h:159 [inline]
 blk_mq_start_request+0xd0/0x230 block/blk-mq.c:721
 loop_queue_rq+0x3c/0x230 drivers/block/loop.c:2004
 blk_mq_dispatch_rq_list+0x570/0xe80 block/blk-mq.c:1369
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline]
 blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199
 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:310
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1488
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1820
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff8881011c5130 of 8 bytes by interrupt on cpu 0:
 wbt_done+0x50/0x1c0 block/blk-wbt.c:190
 __rq_qos_done+0x3b/0x70 block/blk-rq-qos.c:45
 rq_qos_done block/blk-rq-qos.h:153 [inline]
 blk_mq_free_request+0x27b/0x330 block/blk-mq.c:529
 __blk_mq_end_request+0x214/0x230 block/blk-mq.c:557
 blk_mq_end_request+0x37/0x50 block/blk-mq.c:566
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497
 blk_complete_reqs block/blk-mq.c:576 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:581
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 000000000000000b RCX: ffff888100c1c000
RDX: 0000000000010100 RSI: 000000000000000b RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: 00000000fffffffe R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ccbc78 EFLAGS: 00000246
RAX: 649bf4aab10b8700 RBX: ffffffff88f35f60 RCX: 0000000000000414
RDX: 0001ffff876666f8 RSI: 0000000000000082 RDI: ffffffff88f3f210
RBP: ffff8881027d8a40 R08: 0000000000000000 R09: 0001ffff876666ff
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5130 R15: 0000000000000008
 wbt_done+0x50/0x1c0 block/blk-wbt.c:190
 __rq_qos_done+0x3b/0x70 block/blk-rq-qos.c:45
 rq_qos_done block/blk-rq-qos.h:153 [inline]
 blk_mq_free_request+0x27b/0x330 block/blk-mq.c:529
 __blk_mq_end_request+0x214/0x230 block/blk-mq.c:557
 blk_mq_end_request+0x37/0x50 block/blk-mq.c:566
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497
 blk_complete_reqs block/blk-mq.c:576 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:581
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
---[ end trace b86d23bb35328a2b ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G        W         5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 0000000000000016 RCX: ffff888100c1c000
RDX: 0000000000010100 RSI: 0000000000000016 RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: ffff888100c1c000 R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ccbc78 EFLAGS: 00000246
RAX: 649bf4aab10b8700 RBX: ffffffff88f35f60 RCX: 0000000000000414
RDX: 0001ffff876666f8 RSI: 0000000000000082 RDI: ffffffff88f3f210
RBP: ffff8881027d8a40 R08: 0000000000000000 R09: 0001ffff876666ff
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5130 R15: 0000000000000008
 wbt_done+0x50/0x1c0 block/blk-wbt.c:190
 __rq_qos_done+0x3b/0x70 block/blk-rq-qos.c:45
 rq_qos_done block/blk-rq-qos.h:153 [inline]
 blk_mq_free_request+0x27b/0x330 block/blk-mq.c:529
 __blk_mq_end_request+0x214/0x230 block/blk-mq.c:557
 blk_mq_end_request+0x37/0x50 block/blk-mq.c:566
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497
 blk_complete_reqs block/blk-mq.c:576 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:581
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
---[ end trace b86d23bb35328a2c ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G        W         5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 0000000000000016 RCX: ffff888100c1c000
RDX: 0000000000010100 RSI: 0000000000000016 RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: ffff888100c1c000 R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ccbc78 EFLAGS: 00000246
RAX: 649bf4aab10b8700 RBX: ffffffff88f35f60 RCX: 0000000000000414
RDX: 0001ffff876666f8 RSI: 0000000000000082 RDI: ffffffff88f3f210
RBP: ffff8881027d8a40 R08: 0000000000000000 R09: 0001ffff876666ff
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5130 R15: 0000000000000008
 wbt_done+0x50/0x1c0 block/blk-wbt.c:190
 __rq_qos_done+0x3b/0x70 block/blk-rq-qos.c:45
 rq_qos_done block/blk-rq-qos.h:153 [inline]
 blk_mq_free_request+0x27b/0x330 block/blk-mq.c:529
 __blk_mq_end_request+0x214/0x230 block/blk-mq.c:557
 blk_mq_end_request+0x37/0x50 block/blk-mq.c:566
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497
 blk_complete_reqs block/blk-mq.c:576 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:581
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652
 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
---[ end trace b86d23bb35328a2d ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19510 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 19510 Comm: syz-executor.2 Tainted: G        W         5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 000000000000001c RCX: ffff88813101e000
RDX: 0000000080010000 RSI: 000000000000001c RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: ffffc90000003ff8 R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  00007f7f65182700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ebf4d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00098881011c5104
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5104 R15: 0000000000000004
 rwb_enabled block/blk-wbt.c:80 [inline]
 bio_to_wbt_flags block/blk-wbt.c:543 [inline]
 wbt_wait+0x36/0x2b0 block/blk-wbt.c:576
 __rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_submit_bio+0x253/0x1060 block/blk-mq.c:2185
 __submit_bio_noacct_mq block/blk-core.c:1014 [inline]
 submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047
 submit_bio+0x200/0x370 block/blk-core.c:1118
 submit_bh_wbc+0x36b/0x3b0 fs/buffer.c:3055
 ll_rw_block+0x12e/0x180 fs/buffer.c:3061
 reiserfs_breada fs/reiserfs/journal.c:2344 [inline]
 journal_read fs/reiserfs/journal.c:2447 [inline]
 journal_init+0x195f/0x3130 fs/reiserfs/journal.c:2881
 reiserfs_fill_super+0x850/0x1bc0 fs/reiserfs/super.c:2032
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 get_super_block+0x2d/0x40 fs/reiserfs/super.c:2606
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46797a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7f65181fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7f65182000
RBP: 00007f7f65182040 R08: 00007f7f65182040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f7f65182000 R15: 0000000020011400
---[ end trace b86d23bb35328a2e ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19510 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 19510 Comm: syz-executor.2 Tainted: G        W         5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 000000000000001f RCX: ffff88813101e000
RDX: 0000000000010000 RSI: 000000000000001f RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: ffff88813101e000 R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  00007f7f65182700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ebf4d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00098881011c5104
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5104 R15: 0000000000000004
 rwb_enabled block/blk-wbt.c:80 [inline]
 bio_to_wbt_flags block/blk-wbt.c:543 [inline]
 wbt_wait+0x36/0x2b0 block/blk-wbt.c:576
 __rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_submit_bio+0x253/0x1060 block/blk-mq.c:2185
 __submit_bio_noacct_mq block/blk-core.c:1014 [inline]
 submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047
 submit_bio+0x200/0x370 block/blk-core.c:1118
 submit_bh_wbc+0x36b/0x3b0 fs/buffer.c:3055
 ll_rw_block+0x12e/0x180 fs/buffer.c:3061
 reiserfs_breada fs/reiserfs/journal.c:2344 [inline]
 journal_read fs/reiserfs/journal.c:2447 [inline]
 journal_init+0x195f/0x3130 fs/reiserfs/journal.c:2881
 reiserfs_fill_super+0x850/0x1bc0 fs/reiserfs/super.c:2032
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 get_super_block+0x2d/0x40 fs/reiserfs/super.c:2606
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46797a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7f65181fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7f65182000
RBP: 00007f7f65182040 R08: 00007f7f65182040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f7f65182000 R15: 0000000020011400
---[ end trace b86d23bb35328a2f ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 19510 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 0 PID: 19510 Comm: syz-executor.2 Tainted: G        W         5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x209/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 00 00 00 48 c7 c6 90 54 92 86 31 c0 e8 20 43 f7 ff b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 37 02 5b fe <0f> 0b e9 5d fe ff ff 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48
RSP: 0018:ffffc90000003e18 EFLAGS: 00010046
RAX: ffffffff82eb2e59 RBX: 000000000000001f RCX: ffff88813101e000
RDX: 0000000000010000 RSI: 000000000000001f RDI: 0000000000000001
RBP: ffff88813bc1da40 R08: ffffffff82eb2cae R09: 000188810260d4bf
R10: 0001ffffffffffff R11: ffff88813101e000 R12: ffff88813bc1da58
R13: ffff88813bc1da40 R14: ffff88810260c628 R15: 0000000000fe4c00
FS:  00007f7f65182700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdc2dc2907 CR3: 000000012e43f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:smap_restore arch/x86/include/asm/smap.h:70 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
Code: 89 da 4c 8b 5c 24 08 49 c7 02 00 00 00 00 f0 48 ff 0d ae 6f 9c 07 4d 85 db 74 0a 80 3d 84 6d 9c 07 00 75 01 fb 4c 89 6c 24 38 <0f> 1f 44 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 d0
RSP: 0018:ffffc90000ebf4d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00098881011c5104
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88f35f60 R11: 0000000000000200 R12: 0000000000000006
R13: 0000000000000000 R14: ffff8881011c5104 R15: 0000000000000004
 rwb_enabled block/blk-wbt.c:80 [inline]
 bio_to_wbt_flags block/blk-wbt.c:543 [inline]
 wbt_wait+0x36/0x2b0 block/blk-wbt.c:576
 __rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_submit_bio+0x253/0x1060 block/blk-mq.c:2185
 __submit_bio_noacct_mq block/blk-core.c:1014 [inline]
 submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047
 submit_bio+0x200/0x370 block/blk-core.c:1118
 submit_bh_wbc+0x36b/0x3b0 fs/buffer.c:3055
 ll_rw_block+0x12e/0x180 fs/buffer.c:3061
 reiserfs_breada fs/reiserfs/journal.c:2344 [inline]
 journal_read fs/reiserfs/journal.c:2447 [inline]
 journal_init+0x195f/0x3130 fs/reiserfs/journal.c:2881
 reiserfs_fill_super+0x850/0x1bc0 fs/reiserfs/super.c:2032
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 get_super_block+0x2d/0x40 fs/reiserfs/super.c:2606
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46797a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7f65181fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7f65182000
RBP: 00007f7f65182040 R08: 00007f7f65182040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f7f65182000 R15: 0000000020011400
---[ end trace b86d23bb35328a30 ]---