INFO: task syz.2.2147:16118 blocked for more than 143 seconds. Tainted: G U 6.14.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.2147 state:D stack:27200 pid:16118 tgid:16117 ppid:5845 task_flags:0x400140 flags:0x00020004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730 nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:733 [inline] ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2573 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2627 __sys_sendmsg+0x16e/0x220 net/socket.c:2659 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff21e98d169 RSP: 002b:00007ff21f796038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff21eba5fa0 RCX: 00007ff21e98d169 RDX: 0000000000000810 RSI: 0000400000002640 RDI: 0000000000000008 RBP: 00007ff21ea0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff21eba5fa0 R15: 00007fffdda81b38 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746 3 locks held by kworker/u8:12/6090: #0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc900051d7d18 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:285 2 locks held by syz-executor/9333: #0: ffff888056fa20e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff888056fa20e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888056fa20e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596 2 locks held by getty/12067: #0: ffff8880356f00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000d6a32f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by kworker/u8:43/13783: #0: ffff888021ab6948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90004f07d18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 2 locks held by kworker/u8:54/14179: #0: ffff888021ab6948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc9000c1afd18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 3 locks held by kworker/u8:61/14186: #0: ffff88814d30f948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc9000c21fd18 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #2: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x121/0x14e0 net/ipv6/addrconf.c:4190 2 locks held by syz.1.2137/16083: #0: ffffffff8ff99c70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1922 2 locks held by syz.2.2147/16118: #0: ffffffff8ff99c70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629 2 locks held by syz-executor/16276: #0: ffff888056f0a0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff888056f0a0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888056f0a0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596 2 locks held by syz.3.2283/16809: #0: ffffffff8ff99c70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_get_doit+0x1c7/0x7b0 fs/nfsd/nfsctl.c:1713 2 locks held by syz.5.2302/16904: #0: ffffffff8ff99c70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1629 2 locks held by syz.0.2415/17517: 3 locks held by syz.0.2415/17518: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88804753c418 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88804753c418 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 4 locks held by syz.0.2415/17519: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff8880123a01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:199 [inline] #1: ffff8880123a01e0 (&mm->mmap_lock){++++}-{4:4}, at: __get_user_pages_locked mm/gup.c:1732 [inline] #1: ffff8880123a01e0 (&mm->mmap_lock){++++}-{4:4}, at: get_dump_page+0xb6/0x230 mm/gup.c:2275 #2: ffff88807b859968 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #2: ffff88807b859968 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:229 #3: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #3: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #3: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #3: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17520: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88807e30f858 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88807e30f858 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17523: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88807e30bd90 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88807e30bd90 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17524: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88807e308950 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88807e308950 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 2 locks held by syz.0.2415/17525: 3 locks held by syz.0.2415/17527: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88807e30b708 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88807e30b708 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17528: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88807e308fd8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88807e308fd8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17529: 2 locks held by syz.0.2415/17530: 3 locks held by syz.0.2415/17535: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff888028d66b48 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff888028d66b48 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 1 lock held by syz.0.2415/17536: 1 lock held by syz.0.2415/17537: 3 locks held by syz.0.2415/17538: 2 locks held by syz.0.2415/17541: 3 locks held by syz.0.2415/17542: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff888028d671d0 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff888028d671d0 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17543: 3 locks held by syz.0.2415/17544: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88806920d7b0 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88806920d7b0 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 2 locks held by syz.0.2415/17545: 1 lock held by syz.0.2415/17546: 3 locks held by syz.0.2415/17547: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff88806920a370 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff88806920a370 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 3 locks held by syz.0.2415/17548: 3 locks held by syz.0.2415/17550: #0: ffff8880424ca420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x230b/0x26c0 kernel/signal.c:3021 #1: ffff8880692082c8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #1: ffff8880692082c8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3444 #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #2: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 2 locks held by syz.7.2419/17558: #0: ffffffff8ff99c70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e5bfe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1922 2 locks held by syz.9.2430/17667: 1 lock held by syz-executor/17711: #0: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #0: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x316/0x1560 net/ipv4/devinet.c:987 1 lock held by syz.0.2448/17757: #0: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:905 [inline] #0: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:937 [inline] #0: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1462 [inline] #0: ffffe8ffffc21250 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x8fc/0x2690 mm/zswap.c:1571 1 lock held by syz.0.2448/17758: 2 locks held by syz.8.2452/17778: 2 locks held by syz.8.2453/17780: #0: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #0: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x281/0xaa0 net/core/rtnetlink.c:3520 #1: ffffffff8e1c80f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:302 1 lock held by syz.9.2455/17804: 2 locks held by syz.9.2455/17805: 3 locks held by syz.9.2455/17807: 2 locks held by syz.9.2455/17808: 2 locks held by syz.9.2455/17809: 3 locks held by syz.9.2455/17806: 1 lock held by syz.9.2455/17810: 1 lock held by syz.9.2455/17811: 3 locks held by syz.9.2455/17812: 2 locks held by syz.9.2455/17813: 3 locks held by syz.9.2455/17814: 1 lock held by syz.9.2455/17815: 3 locks held by syz.9.2455/17816: 2 locks held by syz.9.2455/17817: 3 locks held by syz.9.2455/17818: 2 locks held by syz.9.2455/17819: 2 locks held by syz.9.2455/17820: 2 locks held by syz.9.2455/17822: 2 locks held by syz.9.2455/17823: 2 locks held by syz.9.2456/17846: #0: ffffffff8fee3250 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:512 #1: ffffffff8fef8ee8 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x1b/0x70 net/ipv4/nexthop.c:3878 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G U 6.14.0-rc4-syzkaller #0 Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline] watchdog+0xf62/0x12b0 kernel/hung_task.c:399 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244