Extracting prog: 1m59.059845022s
Minimizing prog: 7m58.294909027s
Simplifying prog options: 5m56.051300373s
Extracting C: 1m37.312055382s
Simplifying C: 0s
1 programs, timeouts [30s 6m0s]
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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program crashed: possible deadlock in shmem_file_write_iter
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
program did not crash
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
write$binfmt_script(0xffffffffffffffff, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
testing program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, 0x0, 0x0)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
extracting C reproducer
testing compiled C program (duration=52.799332122s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
program crashed: possible deadlock in process_measurement
a never seen crash title: possible deadlock in process_measurement, ignore
simplifying guilty program options
testing program (duration=52.799332122s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program did not crash
testing program (duration=52.799332122s, {Threaded:true Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program crashed: possible deadlock in process_measurement
a never seen crash title: possible deadlock in process_measurement, ignore
testing program (duration=52.799332122s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
detailed listing:
executing program 0:
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f00000001c0)='cgroup.controllers\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x18a3c85)
mmap$IORING_OFF_SQ_RING(&(0x7f0000400000/0xc00000)=nil, 0xc00000, 0x5, 0x401d031, 0xffffffffffffffff, 0x0)
remap_file_pages(&(0x7f0000800000/0x800000)=nil, 0x800000, 0x0, 0x0, 0x10000)
program crashed: possible deadlock in shmem_file_write_iter
extracting C reproducer
testing compiled C program (duration=52.799332122s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_ro-write$binfmt_script-mmap$IORING_OFF_SQ_RING-remap_file_pages
program crashed: possible deadlock in process_measurement
a never seen crash title: possible deadlock in process_measurement, ignore
reproducing took 16m45.174629844s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc3-next-20241016-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.16/5419 is trying to acquire lock:
ffff88802234ea18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
but task is already holding lock:
ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:816 [inline]
ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3225
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#12){++++}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:816 [inline]
process_measurement+0x439/0x1fb0 security/integrity/ima/ima_main.c:250
ima_file_mmap+0x13c/0x220 security/integrity/ima/ima_main.c:455
security_mmap_file+0x7aa/0xa40 security/security.c:2977
__do_sys_remap_file_pages mm/mmap.c:1706 [inline]
__se_sys_remap_file_pages+0x7c6/0xa80 mm/mmap.c:1638
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6139 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6190
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x165/0x2b0
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x259/0x6d0 mm/filemap.c:4046
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3235
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#12);
lock(&mm->mmap_lock);
lock(&sb->s_type->i_mutex_key#12);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.0.16/5419:
#0: ffff88803032c478 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x254/0x320 fs/file.c:1234
#1: ffff888025fe2420 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2953 [inline]
#1: ffff888025fe2420 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
#2: ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:816 [inline]
#2: ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3225
stack backtrace:
CPU: 1 UID: 0 PID: 5419 Comm: syz.0.16 Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6139 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6190
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x165/0x2b0 mm/gup.c:2235
Code: b3 ff 4c 8d b3 ff 0f 00 00 48 89 d8 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 6b e8 95 9d b3 ff 4c 39 f3 74 6e 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0018:ffffc900032a7a40 EFLAGS: 00050293
RAX: ffffffff81e144e7 RBX: 0000000020735000 RCX: ffff888027435a00
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc900032a7af8 R08: ffffffff81e14458 R09: ffffffff84baff49
R10: 0000000000000002 R11: ffff888027435a00 R12: 0000000000200000
R13: dffffc0000000000 R14: 0000000020801000 R15: 1ffff92000654f50
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x259/0x6d0 mm/filemap.c:4046
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3235
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f42a0f7dff9
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:00007f42a1d40038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f42a1135f80 RCX: 00007f42a0f7dff9
RDX: 00000000018a3c85 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f42a0ff0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f42a1135f80 R15: 00007ffd7b979668
----------------
Code disassembly (best guess):
0: b3 ff mov $0xff,%bl
2: 4c 8d b3 ff 0f 00 00 lea 0xfff(%rbx),%r14
9: 48 89 d8 mov %rbx,%rax
c: 4d 01 e6 add %r12,%r14
f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14
16: 49 39 c6 cmp %rax,%r14
19: 72 6b jb 0x86
1b: e8 95 9d b3 ff call 0xffb39db5
20: 4c 39 f3 cmp %r14,%rbx
23: 74 6e je 0x93
25: 4c 89 64 24 10 mov %r12,0x10(%rsp)
* 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax
32: 84 c0 test %al,%al
34: 75 18 jne 0x4e
36: 44 88 64 24 40 mov %r12b,0x40(%rsp)
3b: 48 rex.W
3c: 81 .byte 0x81
3d: c3 ret
3e: 00 10 add %dl,(%rax)
final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc3-next-20241016-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.16/5419 is trying to acquire lock:
ffff88802234ea18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
but task is already holding lock:
ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:816 [inline]
ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3225
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#12){++++}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:816 [inline]
process_measurement+0x439/0x1fb0 security/integrity/ima/ima_main.c:250
ima_file_mmap+0x13c/0x220 security/integrity/ima/ima_main.c:455
security_mmap_file+0x7aa/0xa40 security/security.c:2977
__do_sys_remap_file_pages mm/mmap.c:1706 [inline]
__se_sys_remap_file_pages+0x7c6/0xa80 mm/mmap.c:1638
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6139 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6190
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x165/0x2b0
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x259/0x6d0 mm/filemap.c:4046
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3235
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#12);
lock(&mm->mmap_lock);
lock(&sb->s_type->i_mutex_key#12);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.0.16/5419:
#0: ffff88803032c478 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x254/0x320 fs/file.c:1234
#1: ffff888025fe2420 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2953 [inline]
#1: ffff888025fe2420 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
#2: ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:816 [inline]
#2: ffff888021b91ce8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3225
stack backtrace:
CPU: 1 UID: 0 PID: 5419 Comm: syz.0.16 Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6139 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6190
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x165/0x2b0 mm/gup.c:2235
Code: b3 ff 4c 8d b3 ff 0f 00 00 48 89 d8 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 6b e8 95 9d b3 ff 4c 39 f3 74 6e 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0018:ffffc900032a7a40 EFLAGS: 00050293
RAX: ffffffff81e144e7 RBX: 0000000020735000 RCX: ffff888027435a00
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc900032a7af8 R08: ffffffff81e14458 R09: ffffffff84baff49
R10: 0000000000000002 R11: ffff888027435a00 R12: 0000000000200000
R13: dffffc0000000000 R14: 0000000020801000 R15: 1ffff92000654f50
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x259/0x6d0 mm/filemap.c:4046
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3235
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f42a0f7dff9
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:00007f42a1d40038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f42a1135f80 RCX: 00007f42a0f7dff9
RDX: 00000000018a3c85 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f42a0ff0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f42a1135f80 R15: 00007ffd7b979668
----------------
Code disassembly (best guess):
0: b3 ff mov $0xff,%bl
2: 4c 8d b3 ff 0f 00 00 lea 0xfff(%rbx),%r14
9: 48 89 d8 mov %rbx,%rax
c: 4d 01 e6 add %r12,%r14
f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14
16: 49 39 c6 cmp %rax,%r14
19: 72 6b jb 0x86
1b: e8 95 9d b3 ff call 0xffb39db5
20: 4c 39 f3 cmp %r14,%rbx
23: 74 6e je 0x93
25: 4c 89 64 24 10 mov %r12,0x10(%rsp)
* 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax
32: 84 c0 test %al,%al
34: 75 18 jne 0x4e
36: 44 88 64 24 40 mov %r12b,0x40(%rsp)
3b: 48 rex.W
3c: 81 .byte 0x81
3d: c3 ret
3e: 00 10 add %dl,(%rax)