bisecting fixing commit since c2131f7e73c9e9365613e323d65c7b9e5b910f56
building syzkaller on 032639db52e37f547ea03f03fce37eb8568eb482
testing commit c2131f7e73c9e9365613e323d65c7b9e5b910f56 with gcc (GCC) 10.2.1 20210217
kernel signature: 147ad25c24cdcf8eacf6ca19cb474705f7465693a60b38257da1dd9f439d627f
all runs: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
testing current HEAD 3dbdb38e286903ec220aaf1fb29a8d94297da246
testing commit 3dbdb38e286903ec220aaf1fb29a8d94297da246 with gcc (GCC) 10.2.1 20210217
kernel signature: be86f3f3b2899214e9271a92aa000cb0f01513f966a0a7a9a6242b89884a3943
run #0: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #1: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #2: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #3: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #4: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #5: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #6: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #7: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
run #8: crashed: possible deadlock in fs_reclaim_acquire
run #9: crashed: WARNING in dlfb_submit_urb/usb_submit_urb
revisions tested: 2, total time: 20m57.275277791s (build: 13m19.594130634s, test: 7m6.921651706s)
the crash still happens on HEAD
commit msg: Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
crash: WARNING in dlfb_submit_urb/usb_submit_urb
WARNING: CPU: 0 PID: 8 at drivers/usb/core/urb.c:493 usb_submit_urb+0x9fb/0x1270 drivers/usb/core/urb.c:493
Modules linked in:
CPU: 0 PID: 8 Comm: kworker/0:2 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_submit_urb+0x9fb/0x1270 drivers/usb/core/urb.c:493
Code: 00 4c 89 5c 24 18 44 89 44 24 10 e8 1f f1 21 ff 44 8b 44 24 10 44 89 f9 4c 89 ea 48 89 c6 48 c7 c7 80 b0 3e 89 e8 dc 91 39 03 <0f> 0b 4c 8b 5c 24 18 e9 bd fa ff ff 48 8d 7d 1c 48 ba 00 00 00 00
RSP: 0018:ffffc90000cd6e28 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200019adb7
RBP: ffff888037da4000 R08: 0000000000000001 R09: ffff8880b9e1fa5b
R10: ffffed10173c3f4b R11: 3a312d3120627375 R12: ffff888012591f00
R13: ffff88801b25e1b8 R14: 0000000000000001 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faef145d010 CR3: 0000000027086000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dlfb_submit_urb+0x6c/0x140 drivers/video/fbdev/udlfb.c:1969
 dlfb_set_video_mode+0x1fe2/0x2940 drivers/video/fbdev/udlfb.c:315
 dlfb_ops_set_par+0x275/0x890 drivers/video/fbdev/udlfb.c:1110
 dlfb_usb_probe.cold+0x1091/0x1d05 drivers/video/fbdev/udlfb.c:1732
 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396
 really_probe+0x1fd/0xd10 drivers/base/dd.c:576
 driver_probe_device+0x21a/0x3b0 drivers/base/dd.c:763
 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431
 __device_attach+0x1db/0x410 drivers/base/dd.c:938
 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491
 device_add+0x9f0/0x1d60 drivers/base/core.c:3324
 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238
 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293
 really_probe+0x1fd/0xd10 drivers/base/dd.c:576
 driver_probe_device+0x21a/0x3b0 drivers/base/dd.c:763
 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431
 __device_attach+0x1db/0x410 drivers/base/dd.c:938
 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491
 device_add+0x9f0/0x1d60 drivers/base/core.c:3324
 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2558
 hub_port_connect drivers/usb/core/hub.c:5278 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5418 [inline]
 port_event drivers/usb/core/hub.c:5564 [inline]
 hub_event+0x10a3/0x36c0 drivers/usb/core/hub.c:5646
 process_one_work+0x84c/0x13e0 kernel/workqueue.c:2276
 worker_thread+0x598/0x1040 kernel/workqueue.c:2422
 kthread+0x38b/0x460 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295