syzbot

random: fast init done
watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:2:3166]
Modules linked in:
irq event stamp: 290142
hardirqs last  enabled at (290141): [<ffffffff81007636>] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41
hardirqs last disabled at (290142): [<ffffffff81007652>] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42
softirqs last  enabled at (290138): [<ffffffff880006ef>] __do_softirq+0x6ef/0x9f7 kernel/softirq.c:319
softirqs last disabled at (290127): [<ffffffff814620f2>] invoke_softirq kernel/softirq.c:373 [inline]
softirqs last disabled at (290127): [<ffffffff814620f2>] irq_exit+0x192/0x1d0 kernel/softirq.c:413
CPU: 2 PID: 3166 Comm: kworker/2:2 Not tainted 5.7.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events drm_fb_helper_dirty_work
RIP: 0010:write_comp_data+0x1e/0x70 kernel/kcov.c:208
Code: 48 89 11 c3 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 00 1f 02 00 65 8b 05 e8 e9 8e 7e a9 00 01 1f 00 75 51 41 8b 80 d8 13 00 00 <83> f8 03 75 45 49 8b 80 e0 13 00 00 45 8b 80 dc 13 00 00 4c 8b 08
RSP: 0018:ffffc900044b7990 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffffe8ffadf09440 RCX: ffffffff81686f9e
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000003 R08: ffff8880224b06c0 R09: fffffbfff1512b2e
R10: ffffffff8a89596b R11: fffffbfff1512b2d R12: fffff91ff5be128b
R13: 0000000000000001 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88802d000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e77480000 CR3: 000000001ea82000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 csd_lock_wait kernel/smp.c:109 [inline]
 smp_call_function_many_cond+0x7ce/0x980 kernel/smp.c:484
 smp_call_function_many kernel/smp.c:506 [inline]
 smp_call_function+0x40/0x80 kernel/smp.c:528
 on_each_cpu+0x2a/0x1e0 kernel/smp.c:628
 __purge_vmap_area_lazy+0x123/0x1f60 mm/vmalloc.c:1312
 try_purge_vmap_area_lazy mm/vmalloc.c:1349 [inline]
 free_vmap_area_noflush+0x2bc/0x370 mm/vmalloc.c:1385
 free_unmap_vmap_area mm/vmalloc.c:1398 [inline]
 remove_vm_area+0x1c7/0x230 mm/vmalloc.c:2218
 vm_remove_mappings mm/vmalloc.c:2245 [inline]
 __vunmap+0x232/0x960 mm/vmalloc.c:2307
 vunmap+0x50/0x60 mm/vmalloc.c:2412
 drm_gem_shmem_vunmap_locked drivers/gpu/drm/drm_gem_shmem_helper.c:323 [inline]
 drm_gem_shmem_vunmap+0x157/0x1a0 drivers/gpu/drm/drm_gem_shmem_helper.c:340
 drm_gem_vunmap+0x81/0x130 drivers/gpu/drm/drm_gem.c:1278
 drm_client_buffer_vunmap+0x51/0xa0 drivers/gpu/drm/drm_client.c:340
 drm_fb_helper_dirty_work+0x547/0x6b0 drivers/gpu/drm/drm_fb_helper.c:422
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351