Extracting prog: 1m58.521633063s
Minimizing prog: 8m0.393210069s
Simplifying prog options: 0s
Extracting C: 39.035923753s
Simplifying C: 8m47.07928285s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program crashed: WARNING in del_gendisk
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)

program did not crash
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
ioctl$BTRFS_IOC_BALANCE_CTL(0xffffffffffffffff, 0x4c81, 0xb0275faa5ab88745)

program did not crash
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c81, 0xb0275faa5ab88745)

program did not crash
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
ioctl$BTRFS_IOC_BALANCE_CTL(0xffffffffffffffff, 0x4c80, 0xb0275faa5ab88745)
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c81, 0xb0275faa5ab88745)

program did not crash
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, 0x0, 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program did not crash
testing program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, 0x0, 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program did not crash
extracting C reproducer
testing compiled C program (duration=56.516256148s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
simplifying C reproducer
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing compiled C program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: WARNING in del_gendisk
testing program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program crashed: WARNING in del_gendisk
validation run: crashed=true
testing program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program crashed: WARNING in del_gendisk
validation run: crashed=true
testing program (duration=56.516256148s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL-openat$loop_ctrl-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x4c80, 0xb0275faa5ab88745)
r1 = openat$loop_ctrl(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r1, 0x4c81, 0xb0275faa5ab88745)

program crashed: WARNING in del_gendisk
validation run: crashed=true
reproducing took 22m37.187807854s
repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4317 at block/genhd.c:590 del_gendisk+0x70f/0x790 block/genhd.c:590
Modules linked in:
CPU: 1 PID: 4317 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:del_gendisk+0x70f/0x790 block/genhd.c:590
Code: 00 00 4c 89 f6 e8 71 bf fa ff 4c 89 f7 be 01 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 66 34 fd ff e8 61 bb b2 fd <0f> 0b 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 e1 80 e1
RSP: 0018:ffffc900032dfd88 EFLAGS: 00010293
RAX: ffffffff83c510af RBX: 0000000000000000 RCX: ffff888023553b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88801f95c480 R08: dffffc0000000000 R09: fffff5200065bfb1
R10: fffff5200065bfb1 R11: 1ffff9200065bfb0 R12: ffff88801f95c4a0
R13: ffff88805dce8818 R14: ffff888023189c80 R15: ffff88801f95c400
FS:  000055556c2d9500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557cbdfccea8 CR3: 000000001f527000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 loop_remove+0x3e/0xd0 drivers/block/loop.c:2453
 loop_control_remove drivers/block/loop.c:2510 [inline]
 loop_control_ioctl+0x45f/0x550 drivers/block/loop.c:2548
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f70d0dd56c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4a7b9328 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f70d102bfa0 RCX: 00007f70d0dd56c9
RDX: b0275faa5ab88745 RSI: 0000000000004c81 RDI: 0000000000000004
RBP: 00007f70d0e57f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70d102bfa0 R14: 00007f70d102bfa0 R15: 0000000000000003
 </TASK>

final repro crashed as (corrupted=false):
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4317 at block/genhd.c:590 del_gendisk+0x70f/0x790 block/genhd.c:590
Modules linked in:
CPU: 1 PID: 4317 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:del_gendisk+0x70f/0x790 block/genhd.c:590
Code: 00 00 4c 89 f6 e8 71 bf fa ff 4c 89 f7 be 01 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 66 34 fd ff e8 61 bb b2 fd <0f> 0b 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 e1 80 e1
RSP: 0018:ffffc900032dfd88 EFLAGS: 00010293
RAX: ffffffff83c510af RBX: 0000000000000000 RCX: ffff888023553b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88801f95c480 R08: dffffc0000000000 R09: fffff5200065bfb1
R10: fffff5200065bfb1 R11: 1ffff9200065bfb0 R12: ffff88801f95c4a0
R13: ffff88805dce8818 R14: ffff888023189c80 R15: ffff88801f95c400
FS:  000055556c2d9500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557cbdfccea8 CR3: 000000001f527000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 loop_remove+0x3e/0xd0 drivers/block/loop.c:2453
 loop_control_remove drivers/block/loop.c:2510 [inline]
 loop_control_ioctl+0x45f/0x550 drivers/block/loop.c:2548
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f70d0dd56c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4a7b9328 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f70d102bfa0 RCX: 00007f70d0dd56c9
RDX: b0275faa5ab88745 RSI: 0000000000004c81 RDI: 0000000000000004
RBP: 00007f70d0e57f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70d102bfa0 R14: 00007f70d102bfa0 R15: 0000000000000003
 </TASK>