syzbot

INFO: task syz.0.316:7014 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc7-syzkaller-00003-g4376e966ecb7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.316       state:D stack:23736 pid:7014  tgid:6991  ppid:5426   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 io_schedule+0x8d/0x110 kernel/sched/core.c:9043
 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
 release_metapage+0x8c/0x870 fs/jfs/jfs_metapage.c:764
 discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
 __get_metapage+0xb1d/0x1050 fs/jfs/jfs_metapage.c:644
 dtSplitPage+0x8e7/0x3ed0 fs/jfs/jfs_dtree.c:1468
 dtSplitUp fs/jfs/jfs_dtree.c:1089 [inline]
 dtInsert+0x1500/0x6b00 fs/jfs/jfs_dtree.c:868
 jfs_mkdir+0x7fb/0xb90 fs/jfs/namei.c:270
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4137
 do_mkdirat+0x264/0x3a0 fs/namei.c:4160
 __do_sys_mkdirat fs/namei.c:4175 [inline]
 __se_sys_mkdirat fs/namei.c:4173 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4173
 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: 0033:0x7f714a575bd9
RSP: 002b:00007f714b2c1048 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f714a704038 RCX: 00007f714a575bd9
RDX: 0000000000000000 RSI: 0000000020000340 RDI: ffffffffffffff9c
RBP: 00007f714a5e4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f714a704038 R15: 00007ffc2704ceb8
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/30:
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
4 locks held by kworker/u8:9/2859:
 #0: ffff88801aeba948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff88801aeba948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc90009db7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc90009db7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffff888054c500e0 (&type->s_umount_key#97){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
 #3: ffff8880515cd508 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x24a/0x590 fs/jfs/inode.c:102
1 lock held by dhcpcd/4750:
 #0: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101
2 locks held by getty/4835:
 #0: ffff88802fd990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
4 locks held by kworker/1:3/5130:
3 locks held by kworker/0:8/5134:
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc900041d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc900041d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by syz.2.141/5804:
2 locks held by syz-executor/5920:
 #0: ffff88807a7180e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807a7180e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807a7180e0 (&type->s_umount_key#65){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
 #1: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #1: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:939
4 locks held by syz.0.316/7014:
 #0: ffff888054c50420 (sb_writers#31){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #1: ffff8880515cd8c0 (&type->i_mutex_dir_key#23/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline]
 #1: ffff8880515cd8c0 (&type->i_mutex_dir_key#23/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3906
 #2: ffff8880515cd508 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_mkdir+0x238/0xb90 fs/jfs/namei.c:233
 #3: ffff8880515cde48 (&jfs_ip->commit_mutex/1){+.+.}-{3:3}, at: jfs_mkdir+0x253/0xb90 fs/jfs/namei.c:234
1 lock held by syz-executor/9380:
 #0: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc7-syzkaller-00003-g4376e966ecb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfde/0x1020 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5804 Comm: syz.2.141 Not tainted 6.10.0-rc7-syzkaller-00003-g4376e966ecb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:kasan_check_range+0x1b8/0x290 mm/kasan/generic.c:189
Code: 4d 01 fb 48 8d 5d 07 48 85 ed 48 0f 49 dd 48 83 e3 f8 48 29 dd 74 12 41 80 3b 00 0f 85 a6 00 00 00 49 ff c3 48 ff cd 75 ee 5b <41> 5c 41 5e 41 5f 5d c3 cc cc cc cc 40 84 ed 75 5f f7 c5 00 ff 00
RSP: 0018:ffffc9000302f988 EFLAGS: 00000256
RAX: ffffffff821bef01 RBX: ffffea00014441c0 RCX: ffffffff821beeb0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea00014441c0
RBP: 0000000000000000 R08: ffffea00014441c7 R09: 1ffffd4000288838
R10: dffffc0000000000 R11: fffff94000288839 R12: 1ffffd4000288844
R13: 1ffffd4000288838 R14: dffffc0000000001 R15: fffff94000288839
FS:  00007f93074226c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1d2ed0ab8 CR3: 0000000067fd8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 compound_nr include/linux/mm.h:2104 [inline]
 zero_user_segments+0x230/0x320 include/linux/highmem.h:284
 folio_zero_range include/linux/highmem.h:641 [inline]
 block_read_full_folio+0x5ad/0xe10 fs/buffer.c:2414
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3788
 do_read_cache_page+0x30/0x200 mm/filemap.c:3854
 read_mapping_page include/linux/pagemap.h:900 [inline]
 dir_get_page fs/sysv/dir.c:64 [inline]
 sysv_readdir+0x190/0x3e0 fs/sysv/dir.c:92
 iterate_dir+0x57a/0x810 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:409 [inline]
 __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394
 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: 0033:0x7f9306575bd9
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:00007f9307422048 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f9306703f60 RCX: 00007f9306575bd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f93065e4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9306703f60 R15: 00007fff6d9c6688
 </TASK>