Extracting prog: 1m40.97923051s
Minimizing prog: 30.547826189s
Simplifying prog options: 3m50.365110651s
Extracting C: 1m24.597810094s
Simplifying C: 0s
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:6 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}}): sendmmsg$unix-umount2
detailed listing:
executing program 0:
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
umount2(0x0, 0x3)
program crashed: possible deadlock in zswap_store
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=43.727119945s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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}}): sendmmsg$unix
detailed listing:
executing program 0:
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
program crashed: possible deadlock in zswap_store
extracting C reproducer
testing compiled C program (duration=43.727119945s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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}}): sendmmsg$unix
program did not crash
simplifying guilty program options
testing program (duration=43.727119945s, {Threaded:false Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmmsg$unix
detailed listing:
executing program 0:
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
program crashed: possible deadlock in zswap_store
extracting C reproducer
testing compiled C program (duration=43.727119945s, {Threaded:false Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmmsg$unix
program did not crash
testing program (duration=43.727119945s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmmsg$unix
detailed listing:
executing program 0:
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
program did not crash
testing program (duration=43.727119945s, {Threaded:false 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}}): sendmmsg$unix
detailed listing:
executing program 0:
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
program did not crash
reproducing took 7m27.629139592s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #0 Not tainted
------------------------------------------------------
syz-executor/5385 is trying to acquire lock:
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:931 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1456 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
but task is already holding lock:
ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline]
ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (fs_reclaim){+.+.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4070 [inline]
slab_alloc_node mm/slub.c:4148 [inline]
__kmalloc_cache_node_noprof+0x40/0x3a0 mm/slub.c:4337
kmalloc_node_noprof include/linux/slab.h:924 [inline]
zswap_cpu_comp_prepare+0xdc/0x400 mm/zswap.c:828
cpuhp_invoke_callback+0x415/0x830 kernel/cpu.c:204
cpuhp_issue_call+0x46f/0x7e0
__cpuhp_state_add_instance_cpuslocked+0x1ed/0x500 kernel/cpu.c:2437
__cpuhp_state_add_instance+0x27/0x40 kernel/cpu.c:2458
cpuhp_state_add_instance include/linux/cpuhotplug.h:386 [inline]
zswap_pool_create+0x38c/0x680 mm/zswap.c:291
zswap_setup+0x32a/0x4b0 mm/zswap.c:1811
do_one_initcall+0x248/0x870 init/main.c:1266
do_initcall_level+0x157/0x210 init/main.c:1328
do_initcalls+0x3f/0x80 init/main.c:1344
kernel_init_freeable+0x435/0x5d0 init/main.c:1577
kernel_init+0x1d/0x2b0 init/main.c:1466
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}:
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+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
zswap_compress mm/zswap.c:931 [inline]
zswap_store_page mm/zswap.c:1456 [inline]
zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
swap_writepage+0x647/0xce0 mm/page_io.c:279
shmem_writepage+0x1248/0x1610 mm/shmem.c:1579
pageout mm/vmscan.c:696 [inline]
shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1374
evict_folios+0x3c92/0x58c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4799
shrink_one+0x3b9/0x850 mm/vmscan.c:4844
shrink_many mm/vmscan.c:4907 [inline]
lru_gen_shrink_node mm/vmscan.c:4985 [inline]
shrink_node+0x37c5/0x3e50 mm/vmscan.c:5966
shrink_zones mm/vmscan.c:6225 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6287
try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6537
__perform_reclaim mm/page_alloc.c:3929 [inline]
__alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951
__alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4382
__alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766
alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
folio_alloc_mpol_noprof mm/mempolicy.c:2288 [inline]
vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2318
folio_prealloc+0x2e/0x170
wp_page_copy mm/memory.c:3367 [inline]
do_wp_page+0x1253/0x49b0 mm/memory.c:3759
handle_pte_fault+0xfa5/0x5ed0 mm/memory.c:5817
__handle_mm_fault mm/memory.c:5944 [inline]
handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
schedule_tail+0x96/0xb0 kernel/sched/core.c:5304
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex);
lock(fs_reclaim);
lock(&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex);
*** DEADLOCK ***
2 locks held by syz-executor/5385:
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6149 [inline]
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6209
#1: ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline]
#1: ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951
stack backtrace:
CPU: 0 UID: 0 PID: 5385 Comm: syz-executor Not tainted 6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
zswap_compress mm/zswap.c:931 [inline]
zswap_store_page mm/zswap.c:1456 [inline]
zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
swap_writepage+0x647/0xce0 mm/page_io.c:279
shmem_writepage+0x1248/0x1610 mm/shmem.c:1579
pageout mm/vmscan.c:696 [inline]
shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1374
evict_folios+0x3c92/0x58c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4799
shrink_one+0x3b9/0x850 mm/vmscan.c:4844
shrink_many mm/vmscan.c:4907 [inline]
lru_gen_shrink_node mm/vmscan.c:4985 [inline]
shrink_node+0x37c5/0x3e50 mm/vmscan.c:5966
shrink_zones mm/vmscan.c:6225 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6287
try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6537
__perform_reclaim mm/page_alloc.c:3929 [inline]
__alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951
__alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4382
__alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766
alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
folio_alloc_mpol_noprof mm/mempolicy.c:2288 [inline]
vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2318
folio_prealloc+0x2e/0x170
wp_page_copy mm/memory.c:3367 [inline]
do_wp_page+0x1253/0x49b0 mm/memory.c:3759
handle_pte_fault+0xfa5/0x5ed0 mm/memory.c:5817
__handle_mm_fault mm/memory.c:5944 [inline]
handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d9e7f00 EFLAGS: 00050202
RAX: 0000000000000002 RBX: 0000000000000000 RCX: 000055558ca927d0
RDX: 0000000000000000 RSI: ffffffff8c0aaae0 RDI: ffffffff8c5fb220
RBP: ffff88801f4eaad0 R08: ffffffff90198477 R09: 1ffffffff203308e
R10: dffffc0000000000 R11: fffffbfff203308f R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: dffffc0000000000
schedule_tail+0x96/0xb0 kernel/sched/core.c:5304
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
syz.0.9 (5385) used greatest stack depth: 16240 bytes left
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 84 00 test %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 00 add %al,(%rax)
6: 66 90 xchg %ax,%ax
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: f3 0f 1e fa endbr64
1c: 48 89 cb mov %rcx,%rbx
1f: 48 c1 fb 3f sar $0x3f,%rbx
23: 48 09 d9 or %rbx,%rcx
26: 0f 01 cb stac
* 29: 89 01 mov %eax,(%rcx) <-- trapping instruction
2b: 31 c9 xor %ecx,%ecx
2d: 0f 01 ca clac
30: c3 ret
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: 0f 1f 00 nopl (%rax)
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #0 Not tainted
------------------------------------------------------
syz-executor/5385 is trying to acquire lock:
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:931 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1456 [inline]
ffffe8ffffc37f50 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
but task is already holding lock:
ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline]
ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (fs_reclaim){+.+.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4070 [inline]
slab_alloc_node mm/slub.c:4148 [inline]
__kmalloc_cache_node_noprof+0x40/0x3a0 mm/slub.c:4337
kmalloc_node_noprof include/linux/slab.h:924 [inline]
zswap_cpu_comp_prepare+0xdc/0x400 mm/zswap.c:828
cpuhp_invoke_callback+0x415/0x830 kernel/cpu.c:204
cpuhp_issue_call+0x46f/0x7e0
__cpuhp_state_add_instance_cpuslocked+0x1ed/0x500 kernel/cpu.c:2437
__cpuhp_state_add_instance+0x27/0x40 kernel/cpu.c:2458
cpuhp_state_add_instance include/linux/cpuhotplug.h:386 [inline]
zswap_pool_create+0x38c/0x680 mm/zswap.c:291
zswap_setup+0x32a/0x4b0 mm/zswap.c:1811
do_one_initcall+0x248/0x870 init/main.c:1266
do_initcall_level+0x157/0x210 init/main.c:1328
do_initcalls+0x3f/0x80 init/main.c:1344
kernel_init_freeable+0x435/0x5d0 init/main.c:1577
kernel_init+0x1d/0x2b0 init/main.c:1466
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}:
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+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
zswap_compress mm/zswap.c:931 [inline]
zswap_store_page mm/zswap.c:1456 [inline]
zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
swap_writepage+0x647/0xce0 mm/page_io.c:279
shmem_writepage+0x1248/0x1610 mm/shmem.c:1579
pageout mm/vmscan.c:696 [inline]
shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1374
evict_folios+0x3c92/0x58c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4799
shrink_one+0x3b9/0x850 mm/vmscan.c:4844
shrink_many mm/vmscan.c:4907 [inline]
lru_gen_shrink_node mm/vmscan.c:4985 [inline]
shrink_node+0x37c5/0x3e50 mm/vmscan.c:5966
shrink_zones mm/vmscan.c:6225 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6287
try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6537
__perform_reclaim mm/page_alloc.c:3929 [inline]
__alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951
__alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4382
__alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766
alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
folio_alloc_mpol_noprof mm/mempolicy.c:2288 [inline]
vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2318
folio_prealloc+0x2e/0x170
wp_page_copy mm/memory.c:3367 [inline]
do_wp_page+0x1253/0x49b0 mm/memory.c:3759
handle_pte_fault+0xfa5/0x5ed0 mm/memory.c:5817
__handle_mm_fault mm/memory.c:5944 [inline]
handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
schedule_tail+0x96/0xb0 kernel/sched/core.c:5304
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex);
lock(fs_reclaim);
lock(&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex);
*** DEADLOCK ***
2 locks held by syz-executor/5385:
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6149 [inline]
#0: ffff888012394fe0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6209
#1: ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline]
#1: ffffffff8ea36f00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951
stack backtrace:
CPU: 0 UID: 0 PID: 5385 Comm: syz-executor Not tainted 6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
acomp_ctx_get_cpu_lock mm/zswap.c:899 [inline]
zswap_compress mm/zswap.c:931 [inline]
zswap_store_page mm/zswap.c:1456 [inline]
zswap_store+0xa3b/0x1c30 mm/zswap.c:1563
swap_writepage+0x647/0xce0 mm/page_io.c:279
shmem_writepage+0x1248/0x1610 mm/shmem.c:1579
pageout mm/vmscan.c:696 [inline]
shrink_folio_list+0x3b68/0x5ca0 mm/vmscan.c:1374
evict_folios+0x3c92/0x58c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4799
shrink_one+0x3b9/0x850 mm/vmscan.c:4844
shrink_many mm/vmscan.c:4907 [inline]
lru_gen_shrink_node mm/vmscan.c:4985 [inline]
shrink_node+0x37c5/0x3e50 mm/vmscan.c:5966
shrink_zones mm/vmscan.c:6225 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6287
try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6537
__perform_reclaim mm/page_alloc.c:3929 [inline]
__alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951
__alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4382
__alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766
alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
folio_alloc_mpol_noprof mm/mempolicy.c:2288 [inline]
vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2318
folio_prealloc+0x2e/0x170
wp_page_copy mm/memory.c:3367 [inline]
do_wp_page+0x1253/0x49b0 mm/memory.c:3759
handle_pte_fault+0xfa5/0x5ed0 mm/memory.c:5817
__handle_mm_fault mm/memory.c:5944 [inline]
handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d9e7f00 EFLAGS: 00050202
RAX: 0000000000000002 RBX: 0000000000000000 RCX: 000055558ca927d0
RDX: 0000000000000000 RSI: ffffffff8c0aaae0 RDI: ffffffff8c5fb220
RBP: ffff88801f4eaad0 R08: ffffffff90198477 R09: 1ffffffff203308e
R10: dffffc0000000000 R11: fffffbfff203308f R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: dffffc0000000000
schedule_tail+0x96/0xb0 kernel/sched/core.c:5304
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
syz.0.9 (5385) used greatest stack depth: 16240 bytes left
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 84 00 test %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 00 add %al,(%rax)
6: 66 90 xchg %ax,%ax
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: f3 0f 1e fa endbr64
1c: 48 89 cb mov %rcx,%rbx
1f: 48 c1 fb 3f sar $0x3f,%rbx
23: 48 09 d9 or %rbx,%rcx
26: 0f 01 cb stac
* 29: 89 01 mov %eax,(%rcx) <-- trapping instruction
2b: 31 c9 xor %ecx,%ecx
2d: 0f 01 ca clac
30: c3 ret
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: 0f 1f 00 nopl (%rax)
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop